Merge remote-tracking branch 'remotes/bonzini/tags/for-upstream' into staging

* nbd and qemu-nbd fixes (Eric, Max)
* nbd refactoring (Vladimir)
* vhost-user-scsi, take N+1 (Felipe)
* replace memory_region_set_fd with memory_region_init_ram_from_fd (Marc-André)
* docs/ movement (Paolo)
* megasas TOCTOU fixes (Paolo)
* make async_safe_run_on_cpu work on kvm/hax accelerators (Paolo)
* Build system and poison.h improvements (Thomas)
* -accel thread=xxx fix (Thomas)
* move files to accel/ (Yang Zhong)

# gpg: Signature made Thu 15 Jun 2017 10:51:55 BST
# gpg:                using RSA key 0xBFFBD25F78C7AE83
# gpg: Good signature from "Paolo Bonzini <bonzini@gnu.org>"
# gpg:                 aka "Paolo Bonzini <pbonzini@redhat.com>"
# Primary key fingerprint: 46F5 9FBD 57D6 12E7 BFD4  E2F7 7E15 100C CD36 69B1
#      Subkey fingerprint: F133 3857 4B66 2389 866C  7682 BFFB D25F 78C7 AE83

* remotes/bonzini/tags/for-upstream: (41 commits)
  vhost-user-scsi: Introduce a vhost-user-scsi sample application
  vhost-user-scsi: Introduce vhost-user-scsi host device
  qemu-doc: include version number
  docs: create interop/ subdirectory
  include/exec/poison: Mark some CONFIG defines as poisoned, too
  include/exec/poison: Add missing TARGET defines
  nbd/server: refactor nbd_trip
  nbd/server: rename rc to ret
  nbd/server: get rid of fail: return rc
  nbd/server: nbd_negotiate: fix error path
  nbd/server: remove NBDClientNewData
  nbd/server: refactor nbd_co_receive_request
  nbd/server: get rid of EAGAIN dead code
  nbd/server: refactor nbd_co_send_reply
  nbd/server: get rid of ssize_t
  nbd/server: get rid of nbd_negotiate_read and friends
  nbd: make nbd_drop public
  nbd: rename read_sync and friends
  accel: move kvm related accelerator files into accel/
  tcg: move tcg backend files into accel/tcg/
  ...

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

66 files changed, 1895 insertions, 596 deletions

diff --git a/.gitignore b/.gitignore
index 55a001e..09c2363 100644
--- a/.gitignore
+++ b/.gitignore
@@ -50,6 +50,7 @@
 /qemu-version.h.tmp
 /module_block.h
 /vscclient
+/vhost-user-scsi
 /fsdev/virtfs-proxy-helper
 *.[1-9]
 *.a
@@ -99,14 +100,14 @@
 /pc-bios/optionrom/kvmvapic.img
 /pc-bios/s390-ccw/s390-ccw.elf
 /pc-bios/s390-ccw/s390-ccw.img
-/docs/qemu-ga-qapi.texi
-/docs/qemu-ga-ref.html
-/docs/qemu-ga-ref.info*
-/docs/qemu-ga-ref.txt
-/docs/qemu-qmp-qapi.texi
-/docs/qemu-qmp-ref.html
-/docs/qemu-qmp-ref.info*
-/docs/qemu-qmp-ref.txt
+/docs/interop/qemu-ga-qapi.texi
+/docs/interop/qemu-ga-ref.html
+/docs/interop/qemu-ga-ref.info*
+/docs/interop/qemu-ga-ref.txt
+/docs/interop/qemu-qmp-qapi.texi
+/docs/interop/qemu-qmp-ref.html
+/docs/interop/qemu-qmp-ref.info*
+/docs/interop/qemu-qmp-ref.txt
 /docs/version.texi
 *.tps
 .stgit-*
diff --git a/Makefile b/Makefile
index c830d7a..16a0430 100644
--- a/Makefile
+++ b/Makefile
@@ -207,8 +207,8 @@ HELPERS-$(CONFIG_LINUX) = qemu-bridge-helper$(EXESUF)
 
 ifdef BUILD_DOCS
 DOCS=qemu-doc.html qemu-doc.txt qemu.1 qemu-img.1 qemu-nbd.8 qemu-ga.8
-DOCS+=docs/qemu-qmp-ref.html docs/qemu-qmp-ref.txt docs/qemu-qmp-ref.7
-DOCS+=docs/qemu-ga-ref.html docs/qemu-ga-ref.txt docs/qemu-ga-ref.7
+DOCS+=docs/interop/qemu-qmp-ref.html docs/interop/qemu-qmp-ref.txt docs/interop/qemu-qmp-ref.7
+DOCS+=docs/interop/qemu-ga-ref.html docs/interop/qemu-ga-ref.txt docs/interop/qemu-ga-ref.7
 ifdef CONFIG_VIRTFS
 DOCS+=fsdev/virtfs-proxy-helper.1
 endif
@@ -269,6 +269,7 @@ dummy := $(call unnest-vars,, \
                 ivshmem-client-obj-y \
                 ivshmem-server-obj-y \
                 libvhost-user-obj-y \
+                vhost-user-scsi-obj-y \
                 qga-vss-dll-obj-y \
                 block-obj-y \
                 block-obj-m \
@@ -473,6 +474,8 @@ ivshmem-client$(EXESUF): $(ivshmem-client-obj-y) $(COMMON_LDADDS)
 	$(call LINK, $^)
 ivshmem-server$(EXESUF): $(ivshmem-server-obj-y) $(COMMON_LDADDS)
 	$(call LINK, $^)
+vhost-user-scsi$(EXESUF): $(vhost-user-scsi-obj-y)
+	$(call LINK, $^)
 
 module_block.h: $(SRC_PATH)/scripts/modules/module_block.py config-host.mak
 	$(call quiet-command,$(PYTHON) $< $@ \
@@ -519,11 +522,12 @@ distclean: clean
 	rm -f qemu-doc.vr qemu-doc.txt
 	rm -f config.log
 	rm -f linux-headers/asm
-	rm -f docs/qemu-ga-qapi.texi docs/qemu-qmp-qapi.texi docs/version.texi
-	rm -f docs/qemu-qmp-ref.7 docs/qemu-ga-ref.7
-	rm -f docs/qemu-qmp-ref.txt docs/qemu-ga-ref.txt
-	rm -f docs/qemu-qmp-ref.pdf docs/qemu-ga-ref.pdf
-	rm -f docs/qemu-qmp-ref.html docs/qemu-ga-ref.html
+	rm -f docs/version.texi
+	rm -f docs/interop/qemu-ga-qapi.texi docs/interop/qemu-qmp-qapi.texi
+	rm -f docs/interop/qemu-qmp-ref.7 docs/interop/qemu-ga-ref.7
+	rm -f docs/interop/qemu-qmp-ref.txt docs/interop/qemu-ga-ref.txt
+	rm -f docs/interop/qemu-qmp-ref.pdf docs/interop/qemu-ga-ref.pdf
+	rm -f docs/interop/qemu-qmp-ref.html docs/interop/qemu-ga-ref.html
 	for d in $(TARGET_DIRS); do \
 	rm -rf $$d || exit 1 ; \
         done
@@ -562,13 +566,13 @@ install-doc: $(DOCS)
 	$(INSTALL_DIR) "$(DESTDIR)$(qemu_docdir)"
 	$(INSTALL_DATA) qemu-doc.html "$(DESTDIR)$(qemu_docdir)"
 	$(INSTALL_DATA) qemu-doc.txt "$(DESTDIR)$(qemu_docdir)"
-	$(INSTALL_DATA) docs/qemu-qmp-ref.html "$(DESTDIR)$(qemu_docdir)"
-	$(INSTALL_DATA) docs/qemu-qmp-ref.txt "$(DESTDIR)$(qemu_docdir)"
+	$(INSTALL_DATA) docs/interop/qemu-qmp-ref.html "$(DESTDIR)$(qemu_docdir)"
+	$(INSTALL_DATA) docs/interop/qemu-qmp-ref.txt "$(DESTDIR)$(qemu_docdir)"
 ifdef CONFIG_POSIX
 	$(INSTALL_DIR) "$(DESTDIR)$(mandir)/man1"
 	$(INSTALL_DATA) qemu.1 "$(DESTDIR)$(mandir)/man1"
 	$(INSTALL_DIR) "$(DESTDIR)$(mandir)/man7"
-	$(INSTALL_DATA) docs/qemu-qmp-ref.7 "$(DESTDIR)$(mandir)/man7"
+	$(INSTALL_DATA) docs/interop/qemu-qmp-ref.7 "$(DESTDIR)$(mandir)/man7"
 ifneq ($(TOOLS),)
 	$(INSTALL_DATA) qemu-img.1 "$(DESTDIR)$(mandir)/man1"
 	$(INSTALL_DIR) "$(DESTDIR)$(mandir)/man8"
@@ -576,9 +580,9 @@ ifneq ($(TOOLS),)
 endif
 ifneq (,$(findstring qemu-ga,$(TOOLS)))
 	$(INSTALL_DATA) qemu-ga.8 "$(DESTDIR)$(mandir)/man8"
-	$(INSTALL_DATA) docs/qemu-ga-ref.html "$(DESTDIR)$(qemu_docdir)"
-	$(INSTALL_DATA) docs/qemu-ga-ref.txt "$(DESTDIR)$(qemu_docdir)"
-	$(INSTALL_DATA) docs/qemu-ga-ref.7 "$(DESTDIR)$(mandir)/man7"
+	$(INSTALL_DATA) docs/interop/qemu-ga-ref.html "$(DESTDIR)$(qemu_docdir)"
+	$(INSTALL_DATA) docs/interop/qemu-ga-ref.txt "$(DESTDIR)$(qemu_docdir)"
+	$(INSTALL_DATA) docs/interop/qemu-ga-ref.7 "$(DESTDIR)$(mandir)/man7"
 endif
 endif
 ifdef CONFIG_VIRTFS
@@ -666,28 +670,27 @@ ui/console-gl.o: $(SRC_PATH)/ui/console-gl.c \
 
 # documentation
 MAKEINFO=makeinfo
-MAKEINFOFLAGS=--no-split --number-sections -I docs
-TEXIFLAG=$(if $(V),,--quiet)
+MAKEINFOINCLUDES= -I docs -I $(<D) -I $(@D)
+MAKEINFOFLAGS=--no-split --number-sections $(MAKEINFOINCLUDES)
+TEXI2PODFLAGS=$(MAKEINFOINCLUDES) "-DVERSION=$(VERSION)"
+TEXI2PDFFLAGS=$(if $(V),,--quiet) -I $(SRC_PATH) $(MAKEINFOINCLUDES)
 
 docs/version.texi: $(SRC_PATH)/VERSION
 	$(call quiet-command,echo "@set VERSION $(VERSION)" > $@,"GEN","$@")
 
-%.html: %.texi
+%.html: %.texi docs/version.texi
 	$(call quiet-command,LC_ALL=C $(MAKEINFO) $(MAKEINFOFLAGS) --no-headers \
 	--html $< -o $@,"GEN","$@")
 
-%.info: %.texi
+%.info: %.texi docs/version.texi
 	$(call quiet-command,$(MAKEINFO) $(MAKEINFOFLAGS) $< -o $@,"GEN","$@")
 
-%.txt: %.texi
+%.txt: %.texi docs/version.texi
 	$(call quiet-command,LC_ALL=C $(MAKEINFO) $(MAKEINFOFLAGS) --no-headers \
 	--plaintext $< -o $@,"GEN","$@")
 
-%.pdf: %.texi
-	$(call quiet-command,texi2pdf $(TEXIFLAG) -I $(SRC_PATH) -I docs $< -o $@,"GEN","$@")
-
-docs/qemu-ga-ref.html docs/qemu-ga-ref.info docs/qemu-ga-ref.txt docs/qemu-ga-ref.pdf docs/qemu-ga-ref.7.pod: docs/version.texi
-docs/qemu-qmp-ref.html docs/qemu-qmp-ref.info docs/qemu-qmp-ref.txt docs/qemu-qmp-ref.pdf docs/qemu-qmp-ref.pod: docs/version.texi
+%.pdf: %.texi docs/version.texi
+	$(call quiet-command,texi2pdf $(TEXI2PDFFLAGS) $< -o $@,"GEN","$@")
 
 qemu-options.texi: $(SRC_PATH)/qemu-options.hx $(SRC_PATH)/scripts/hxtool
 	$(call quiet-command,sh $(SRC_PATH)/scripts/hxtool -t < $< > $@,"GEN","$@")
@@ -701,12 +704,12 @@ qemu-monitor-info.texi: $(SRC_PATH)/hmp-commands-info.hx $(SRC_PATH)/scripts/hxt
 qemu-img-cmds.texi: $(SRC_PATH)/qemu-img-cmds.hx $(SRC_PATH)/scripts/hxtool
 	$(call quiet-command,sh $(SRC_PATH)/scripts/hxtool -t < $< > $@,"GEN","$@")
 
-docs/qemu-qmp-qapi.texi docs/qemu-ga-qapi.texi: $(SRC_PATH)/scripts/qapi2texi.py $(qapi-py)
+docs/interop/qemu-qmp-qapi.texi docs/interop/qemu-ga-qapi.texi: $(SRC_PATH)/scripts/qapi2texi.py $(qapi-py)
 
-docs/qemu-qmp-qapi.texi: $(qapi-modules)
+docs/interop/qemu-qmp-qapi.texi: $(qapi-modules)
 	$(call quiet-command,$(PYTHON) $(SRC_PATH)/scripts/qapi2texi.py $< > $@,"GEN","$@")
 
-docs/qemu-ga-qapi.texi: $(SRC_PATH)/qga/qapi-schema.json
+docs/interop/qemu-ga-qapi.texi: $(SRC_PATH)/qga/qapi-schema.json
 	$(call quiet-command,$(PYTHON) $(SRC_PATH)/scripts/qapi2texi.py $< > $@,"GEN","$@")
 
 qemu.1: qemu-doc.texi qemu-options.texi qemu-monitor.texi qemu-monitor-info.texi
@@ -716,21 +719,25 @@ fsdev/virtfs-proxy-helper.1: fsdev/virtfs-proxy-helper.texi
 qemu-nbd.8: qemu-nbd.texi qemu-option-trace.texi
 qemu-ga.8: qemu-ga.texi
 
-html: qemu-doc.html docs/qemu-qmp-ref.html docs/qemu-ga-ref.html
-info: qemu-doc.info docs/qemu-qmp-ref.info docs/qemu-ga-ref.info
-pdf: qemu-doc.pdf docs/qemu-qmp-ref.pdf docs/qemu-ga-ref.pdf
-txt: qemu-doc.txt docs/qemu-qmp-ref.txt docs/qemu-ga-ref.txt
+html: qemu-doc.html docs/interop/qemu-qmp-ref.html docs/interop/qemu-ga-ref.html
+info: qemu-doc.info docs/interop/qemu-qmp-ref.info docs/interop/qemu-ga-ref.info
+pdf: qemu-doc.pdf docs/interop/qemu-qmp-ref.pdf docs/interop/qemu-ga-ref.pdf
+txt: qemu-doc.txt docs/interop/qemu-qmp-ref.txt docs/interop/qemu-ga-ref.txt
 
 qemu-doc.html qemu-doc.info qemu-doc.pdf qemu-doc.txt: \
 	qemu-img.texi qemu-nbd.texi qemu-options.texi qemu-option-trace.texi \
 	qemu-monitor.texi qemu-img-cmds.texi qemu-ga.texi \
 	qemu-monitor-info.texi
 
-docs/qemu-ga-ref.dvi docs/qemu-ga-ref.html docs/qemu-ga-ref.info docs/qemu-ga-ref.pdf docs/qemu-ga-ref.txt docs/qemu-ga-ref.7: \
-docs/qemu-ga-ref.texi docs/qemu-ga-qapi.texi
+docs/interop/qemu-ga-ref.dvi docs/interop/qemu-ga-ref.html \
+    docs/interop/qemu-ga-ref.info docs/interop/qemu-ga-ref.pdf \
+    docs/interop/qemu-ga-ref.txt docs/interop/qemu-ga-ref.7: \
+	docs/interop/qemu-ga-ref.texi docs/interop/qemu-ga-qapi.texi
 
-docs/qemu-qmp-ref.dvi docs/qemu-qmp-ref.html docs/qemu-qmp-ref.info docs/qemu-qmp-ref.pdf docs/qemu-qmp-ref.txt docs/qemu-qmp-ref.7: \
-docs/qemu-qmp-ref.texi docs/qemu-qmp-qapi.texi
+docs/interop/qemu-qmp-ref.dvi docs/interop/qemu-qmp-ref.html \
+    docs/interop/qemu-qmp-ref.info docs/interop/qemu-qmp-ref.pdf \
+    docs/interop/qemu-qmp-ref.txt docs/interop/qemu-qmp-ref.7: \
+	docs/interop/qemu-qmp-ref.texi docs/interop/qemu-qmp-qapi.texi
 
 
 ifdef CONFIG_WIN32
@@ -791,9 +798,11 @@ endif # CONFIG_WIN
 
 # Add a dependency on the generated files, so that they are always
 # rebuilt before other object files
+ifneq ($(wildcard config-host.mak),)
 ifneq ($(filter-out $(UNCHECKED_GOALS),$(MAKECMDGOALS)),$(if $(MAKECMDGOALS),,fail))
 Makefile: $(GENERATED_FILES)
 endif
+endif
 
 .SECONDARY: $(TRACE_HEADERS) $(TRACE_HEADERS:%=%-timestamp) \
 	$(TRACE_SOURCES) $(TRACE_SOURCES:%=%-timestamp) \
diff --git a/Makefile.objs b/Makefile.objs
index 0575802..b2e6322 100644
--- a/Makefile.objs
+++ b/Makefile.objs
@@ -52,7 +52,6 @@ common-obj-y += migration/
 
 common-obj-y += audio/
 common-obj-y += hw/
-common-obj-y += accel.o
 
 common-obj-y += replay/
 
@@ -111,6 +110,10 @@ qga-vss-dll-obj-y = qga/
 ivshmem-client-obj-y = contrib/ivshmem-client/
 ivshmem-server-obj-y = contrib/ivshmem-server/
 libvhost-user-obj-y = contrib/libvhost-user/
+vhost-user-scsi.o-cflags := $(LIBISCSI_CFLAGS)
+vhost-user-scsi.o-libs := $(LIBISCSI_LIBS)
+vhost-user-scsi-obj-y = contrib/vhost-user-scsi/
+vhost-user-scsi-obj-y += contrib/libvhost-user/libvhost-user.o
 
 ######################################################################
 trace-events-subdirs =
@@ -163,6 +166,8 @@ trace-events-subdirs += target/ppc
 trace-events-subdirs += qom
 trace-events-subdirs += linux-user
 trace-events-subdirs += qapi
+trace-events-subdirs += accel/tcg
+trace-events-subdirs += accel/kvm
 
 trace-events-files = $(SRC_PATH)/trace-events $(trace-events-subdirs:%=$(SRC_PATH)/%/trace-events)
 
diff --git a/Makefile.target b/Makefile.target
index ce8dfe4..3d49f29 100644
--- a/Makefile.target
+++ b/Makefile.target
@@ -88,20 +88,17 @@ all: $(PROGS) stap
 
 #########################################################
 # cpu emulator library
-obj-y = exec.o translate-all.o cpu-exec.o
-obj-y += translate-common.o
-obj-y += cpu-exec-common.o
+obj-y += exec.o
+obj-y += accel/
 obj-y += tcg/tcg.o tcg/tcg-op.o tcg/optimize.o
+obj-y += tcg/tcg-common.o tcg/tcg-runtime.o
 obj-$(CONFIG_TCG_INTERPRETER) += tci.o
-obj-y += tcg/tcg-common.o
 obj-$(CONFIG_TCG_INTERPRETER) += disas/tci.o
 obj-y += fpu/softfloat.o
 obj-y += target/$(TARGET_BASE_ARCH)/
 obj-y += disas.o
-obj-y += tcg-runtime.o
 obj-$(call notempty,$(TARGET_XML_FILES)) += gdbstub-xml.o
 obj-$(call lnot,$(CONFIG_HAX)) += hax-stub.o
-obj-$(call lnot,$(CONFIG_KVM)) += kvm-stub.o
 
 obj-$(CONFIG_LIBDECNUMBER) += libdecnumber/decContext.o
 obj-$(CONFIG_LIBDECNUMBER) += libdecnumber/decNumber.o
@@ -142,8 +139,7 @@ ifdef CONFIG_SOFTMMU
 obj-y += arch_init.o cpus.o monitor.o gdbstub.o balloon.o ioport.o numa.o
 obj-y += qtest.o bootdevice.o
 obj-y += hw/
-obj-$(CONFIG_KVM) += kvm-all.o
-obj-y += memory.o cputlb.o
+obj-y += memory.o
 obj-y += memory_mapping.o
 obj-y += dump.o
 obj-y += migration/ram.o
diff --git a/accel/Makefile.objs b/accel/Makefile.objs
new file mode 100644
index 0000000..cd5702f
--- /dev/null
+++ b/accel/Makefile.objs
@@ -0,0 +1,4 @@
+obj-$(CONFIG_SOFTMMU) += accel.o
+obj-y += kvm/
+obj-y += tcg/
+obj-y += stubs/
diff --git a/accel.c b/accel/accel.c
index 664bb88..7c079a5 100644
--- a/accel.c
+++ b/accel/accel.c
@@ -34,15 +34,6 @@
 #include "hw/xen/xen.h"
 #include "qom/object.h"
 
-int tcg_tb_size;
-static bool tcg_allowed = true;
-
-static int tcg_init(MachineState *ms)
-{
-    tcg_exec_init(tcg_tb_size * 1024 * 1024);
-    return 0;
-}
-
 static const TypeInfo accel_type = {
     .name = TYPE_ACCEL,
     .parent = TYPE_OBJECT,
@@ -129,27 +120,9 @@ void configure_accelerator(MachineState *ms)
     }
 }
 
-
-static void tcg_accel_class_init(ObjectClass *oc, void *data)
-{
-    AccelClass *ac = ACCEL_CLASS(oc);
-    ac->name = "tcg";
-    ac->init_machine = tcg_init;
-    ac->allowed = &tcg_allowed;
-}
-
-#define TYPE_TCG_ACCEL ACCEL_CLASS_NAME("tcg")
-
-static const TypeInfo tcg_accel_type = {
-    .name = TYPE_TCG_ACCEL,
-    .parent = TYPE_ACCEL,
-    .class_init = tcg_accel_class_init,
-};
-
 static void register_accel_types(void)
 {
     type_register_static(&accel_type);
-    type_register_static(&tcg_accel_type);
 }
 
 type_init(register_accel_types);
diff --git a/accel/kvm/Makefile.objs b/accel/kvm/Makefile.objs
new file mode 100644
index 0000000..85351e7
--- /dev/null
+++ b/accel/kvm/Makefile.objs
@@ -0,0 +1 @@
+obj-$(CONFIG_KVM) += kvm-all.o
diff --git a/kvm-all.c b/accel/kvm/kvm-all.c
index ab8262f..75feffa 100644
--- a/kvm-all.c
+++ b/accel/kvm/kvm-all.c
@@ -36,7 +36,7 @@
 #include "exec/ram_addr.h"
 #include "exec/address-spaces.h"
 #include "qemu/event_notifier.h"
-#include "trace-root.h"
+#include "trace.h"
 #include "hw/irq.h"
 
 #include "hw/boards.h"
@@ -1977,6 +1977,7 @@ int kvm_cpu_exec(CPUState *cpu)
     }
 
     qemu_mutex_unlock_iothread();
+    cpu_exec_start(cpu);
 
     do {
         MemTxAttrs attrs;
@@ -2106,6 +2107,7 @@ int kvm_cpu_exec(CPUState *cpu)
         }
     } while (ret == 0);
 
+    cpu_exec_end(cpu);
     qemu_mutex_lock_iothread();
 
     if (ret < 0) {
diff --git a/accel/kvm/trace-events b/accel/kvm/trace-events
new file mode 100644
index 0000000..f89ba55
--- /dev/null
+++ b/accel/kvm/trace-events
@@ -0,0 +1,15 @@
+# Trace events for debugging and performance instrumentation
+
+# kvm-all.c
+kvm_ioctl(int type, void *arg) "type 0x%x, arg %p"
+kvm_vm_ioctl(int type, void *arg) "type 0x%x, arg %p"
+kvm_vcpu_ioctl(int cpu_index, int type, void *arg) "cpu_index %d, type 0x%x, arg %p"
+kvm_run_exit(int cpu_index, uint32_t reason) "cpu_index %d, reason %d"
+kvm_device_ioctl(int fd, int type, void *arg) "dev fd %d, type 0x%x, arg %p"
+kvm_failed_reg_get(uint64_t id, const char *msg) "Warning: Unable to retrieve ONEREG %" PRIu64 " from KVM: %s"
+kvm_failed_reg_set(uint64_t id, const char *msg) "Warning: Unable to set ONEREG %" PRIu64 " to KVM: %s"
+kvm_irqchip_commit_routes(void) ""
+kvm_irqchip_add_msi_route(char *name, int vector, int virq) "dev %s vector %d virq %d"
+kvm_irqchip_update_msi_route(int virq) "Updating MSI route virq=%d"
+kvm_irqchip_release_virq(int virq) "virq %d"
+
diff --git a/accel/stubs/Makefile.objs b/accel/stubs/Makefile.objs
new file mode 100644
index 0000000..bd5794f
--- /dev/null
+++ b/accel/stubs/Makefile.objs
@@ -0,0 +1 @@
+obj-$(call lnot,$(CONFIG_KVM)) += kvm-stub.o
diff --git a/kvm-stub.c b/accel/stubs/kvm-stub.c
index ef0c734..ef0c734 100644
--- a/kvm-stub.c
+++ b/accel/stubs/kvm-stub.c
diff --git a/accel/tcg/Makefile.objs b/accel/tcg/Makefile.objs
new file mode 100644
index 0000000..f173cd5
--- /dev/null
+++ b/accel/tcg/Makefile.objs
@@ -0,0 +1,3 @@
+obj-$(CONFIG_SOFTMMU) += tcg-all.o
+obj-$(CONFIG_SOFTMMU) += cputlb.o
+obj-y += cpu-exec.o cpu-exec-common.o translate-all.o translate-common.o
diff --git a/cpu-exec-common.c b/accel/tcg/cpu-exec-common.c
index e81da27..e81da27 100644
--- a/cpu-exec-common.c
+++ b/accel/tcg/cpu-exec-common.c
diff --git a/cpu-exec.c b/accel/tcg/cpu-exec.c
index 5b181c1..3581618 100644
--- a/cpu-exec.c
+++ b/accel/tcg/cpu-exec.c
@@ -18,7 +18,7 @@
  */
 #include "qemu/osdep.h"
 #include "cpu.h"
-#include "trace-root.h"
+#include "trace.h"
 #include "disas/disas.h"
 #include "exec/exec-all.h"
 #include "tcg.h"
diff --git a/cputlb.c b/accel/tcg/cputlb.c
index 743776a..743776a 100644
--- a/cputlb.c
+++ b/accel/tcg/cputlb.c
diff --git a/accel/tcg/tcg-all.c b/accel/tcg/tcg-all.c
new file mode 100644
index 0000000..dba9931
--- /dev/null
+++ b/accel/tcg/tcg-all.c
@@ -0,0 +1,61 @@
+/*
+ * QEMU System Emulator, accelerator interfaces
+ *
+ * Copyright (c) 2003-2008 Fabrice Bellard
+ * Copyright (c) 2014 Red Hat Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "qemu/osdep.h"
+#include "sysemu/accel.h"
+#include "sysemu/sysemu.h"
+#include "qom/object.h"
+
+int tcg_tb_size;
+static bool tcg_allowed = true;
+
+static int tcg_init(MachineState *ms)
+{
+    tcg_exec_init(tcg_tb_size * 1024 * 1024);
+    return 0;
+}
+
+static void tcg_accel_class_init(ObjectClass *oc, void *data)
+{
+    AccelClass *ac = ACCEL_CLASS(oc);
+    ac->name = "tcg";
+    ac->init_machine = tcg_init;
+    ac->allowed = &tcg_allowed;
+}
+
+#define TYPE_TCG_ACCEL ACCEL_CLASS_NAME("tcg")
+
+static const TypeInfo tcg_accel_type = {
+    .name = TYPE_TCG_ACCEL,
+    .parent = TYPE_ACCEL,
+    .class_init = tcg_accel_class_init,
+};
+
+static void register_accel_types(void)
+{
+    type_register_static(&tcg_accel_type);
+}
+
+type_init(register_accel_types);
diff --git a/accel/tcg/trace-events b/accel/tcg/trace-events
new file mode 100644
index 0000000..2de8359
--- /dev/null
+++ b/accel/tcg/trace-events
@@ -0,0 +1,10 @@
+# Trace events for debugging and performance instrumentation
+
+# TCG related tracing (mostly disabled by default)
+# cpu-exec.c
+disable exec_tb(void *tb, uintptr_t pc) "tb:%p pc=0x%"PRIxPTR
+disable exec_tb_nocache(void *tb, uintptr_t pc) "tb:%p pc=0x%"PRIxPTR
+disable exec_tb_exit(void *last_tb, unsigned int flags) "tb:%p flags=%x"
+
+# translate-all.c
+translate_block(void *tb, uintptr_t pc, uint8_t *tb_code) "tb:%p, pc:0x%"PRIxPTR", tb_code:%p"
diff --git a/translate-all.c b/accel/tcg/translate-all.c
index b3ee876..7b25a16 100644
--- a/translate-all.c
+++ b/accel/tcg/translate-all.c
@@ -25,7 +25,7 @@
 #include "qemu-common.h"
 #define NO_CPU_IO_DEFS
 #include "cpu.h"
-#include "trace-root.h"
+#include "trace.h"
 #include "disas/disas.h"
 #include "exec/exec-all.h"
 #include "tcg.h"
diff --git a/translate-all.h b/accel/tcg/translate-all.h
index ba8e4d6..ba8e4d6 100644
--- a/translate-all.h
+++ b/accel/tcg/translate-all.h
diff --git a/translate-common.c b/accel/tcg/translate-common.c
index 40fe5a1..40fe5a1 100644
--- a/translate-common.c
+++ b/accel/tcg/translate-common.c
diff --git a/block/nbd-client.c b/block/nbd-client.c
index 87d19c7..d64e775 100644
--- a/block/nbd-client.c
+++ b/block/nbd-client.c
@@ -144,8 +144,8 @@ static int nbd_co_send_request(BlockDriverState *bs,
         qio_channel_set_cork(s->ioc, true);
         rc = nbd_send_request(s->ioc, request);
         if (rc >= 0) {
-            ret = nbd_wr_syncv(s->ioc, qiov->iov, qiov->niov, request->len,
-                               false, NULL);
+            ret = nbd_rwv(s->ioc, qiov->iov, qiov->niov, request->len, false,
+                          NULL);
             if (ret != request->len) {
                 rc = -EIO;
             }
@@ -173,8 +173,8 @@ static void nbd_co_receive_reply(NBDClientSession *s,
         reply->error = EIO;
     } else {
         if (qiov && reply->error == 0) {
-            ret = nbd_wr_syncv(s->ioc, qiov->iov, qiov->niov, request->len,
-                               true, NULL);
+            ret = nbd_rwv(s->ioc, qiov->iov, qiov->niov, request->len, true,
+                          NULL);
             if (ret != request->len) {
                 reply->error = EIO;
             }
diff --git a/blockdev-nbd.c b/blockdev-nbd.c
index dd0860f..28f551a 100644
--- a/blockdev-nbd.c
+++ b/blockdev-nbd.c
@@ -27,6 +27,10 @@ typedef struct NBDServerData {
 
 static NBDServerData *nbd_server;
 
+static void nbd_blockdev_client_closed(NBDClient *client, bool ignored)
+{
+    nbd_client_put(client);
+}
 
 static gboolean nbd_accept(QIOChannel *ioc, GIOCondition condition,
                            gpointer opaque)
@@ -46,7 +50,7 @@ static gboolean nbd_accept(QIOChannel *ioc, GIOCondition condition,
     qio_channel_set_name(QIO_CHANNEL(cioc), "nbd-server");
     nbd_client_new(NULL, cioc,
                    nbd_server->tlscreds, NULL,
-                   nbd_client_put);
+                   nbd_blockdev_client_closed);
     object_unref(OBJECT(cioc));
     return TRUE;
 }
diff --git a/configure b/configure
index db0798d..ff0f8b9 100755
--- a/configure
+++ b/configure
@@ -407,7 +407,7 @@ QEMU_CFLAGS="-fno-strict-aliasing -fno-common -fwrapv $QEMU_CFLAGS"
 QEMU_CFLAGS="-Wall -Wundef -Wwrite-strings -Wmissing-prototypes $QEMU_CFLAGS"
 QEMU_CFLAGS="-Wstrict-prototypes -Wredundant-decls $QEMU_CFLAGS"
 QEMU_CFLAGS="-D_GNU_SOURCE -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE $QEMU_CFLAGS"
-QEMU_INCLUDES="-I. -I\$(SRC_PATH) -I\$(SRC_PATH)/include"
+QEMU_INCLUDES="-I. -I\$(SRC_PATH) -I\$(SRC_PATH)/accel/tcg -I\$(SRC_PATH)/include"
 if test "$debug_info" = "yes"; then
     CFLAGS="-g $CFLAGS"
     LDFLAGS="-g $LDFLAGS"
@@ -6374,7 +6374,7 @@ fi
 
 # build tree in object directory in case the source is not in the current directory
 DIRS="tests tests/tcg tests/tcg/cris tests/tcg/lm32 tests/libqos tests/qapi-schema tests/tcg/xtensa tests/qemu-iotests"
-DIRS="$DIRS docs fsdev"
+DIRS="$DIRS docs docs/interop fsdev"
 DIRS="$DIRS pc-bios/optionrom pc-bios/spapr-rtas pc-bios/s390-ccw"
 DIRS="$DIRS roms/seabios roms/vgabios"
 DIRS="$DIRS qapi-generated"
diff --git a/contrib/libvhost-user/libvhost-user.h b/contrib/libvhost-user/libvhost-user.h
index af02a31..53ef222 100644
--- a/contrib/libvhost-user/libvhost-user.h
+++ b/contrib/libvhost-user/libvhost-user.h
@@ -17,6 +17,7 @@
 #include <stdint.h>
 #include <stdbool.h>
 #include <stddef.h>
+#include <sys/poll.h>
 #include <linux/vhost.h>
 #include "standard-headers/linux/virtio_ring.h"
 
@@ -192,11 +193,11 @@ typedef struct VuVirtq {
 } VuVirtq;
 
 enum VuWatchCondtion {
-    VU_WATCH_IN = 1 << 0,
-    VU_WATCH_OUT = 1 << 1,
-    VU_WATCH_PRI = 1 << 2,
-    VU_WATCH_ERR = 1 << 3,
-    VU_WATCH_HUP = 1 << 4,
+    VU_WATCH_IN = POLLIN,
+    VU_WATCH_OUT = POLLOUT,
+    VU_WATCH_PRI = POLLPRI,
+    VU_WATCH_ERR = POLLERR,
+    VU_WATCH_HUP = POLLHUP,
 };
 
 typedef void (*vu_panic_cb) (VuDev *dev, const char *err);
diff --git a/contrib/vhost-user-scsi/Makefile.objs b/contrib/vhost-user-scsi/Makefile.objs
new file mode 100644
index 0000000..e83a38a
--- /dev/null
+++ b/contrib/vhost-user-scsi/Makefile.objs
@@ -0,0 +1 @@
+vhost-user-scsi-obj-y = vhost-user-scsi.o
diff --git a/contrib/vhost-user-scsi/vhost-user-scsi.c b/contrib/vhost-user-scsi/vhost-user-scsi.c
new file mode 100644
index 0000000..b5ae02c
--- /dev/null
+++ b/contrib/vhost-user-scsi/vhost-user-scsi.c
@@ -0,0 +1,886 @@
+/*
+ * vhost-user-scsi sample application
+ *
+ * Copyright (c) 2016 Nutanix Inc. All rights reserved.
+ *
+ * Author:
+ *  Felipe Franciosi <felipe@nutanix.com>
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 only.
+ * See the COPYING file in the top-level directory.
+ */
+
+#include "qemu/osdep.h"
+#include "contrib/libvhost-user/libvhost-user.h"
+#include "hw/virtio/virtio-scsi.h"
+#include "iscsi/iscsi.h"
+
+#include <glib.h>
+
+/* Small compat shim from glib 2.32 */
+#ifndef G_SOURCE_CONTINUE
+#define G_SOURCE_CONTINUE TRUE
+#endif
+#ifndef G_SOURCE_REMOVE
+#define G_SOURCE_REMOVE FALSE
+#endif
+
+/* #define VUS_DEBUG 1 */
+
+/** Log helpers **/
+
+#define PPRE                                                          \
+    struct timespec ts;                                               \
+    char   timebuf[64];                                               \
+    struct tm tm;                                                     \
+    (void)clock_gettime(CLOCK_REALTIME, &ts);                         \
+    (void)strftime(timebuf, 64, "%Y%m%d %T", gmtime_r(&ts.tv_sec, &tm))
+
+#define PEXT(lvl, msg, ...) do {                                      \
+    PPRE;                                                             \
+    fprintf(stderr, "%s.%06ld " lvl ": %s:%s():%d: " msg "\n",        \
+            timebuf, ts.tv_nsec / 1000,                               \
+            __FILE__, __func__, __LINE__, ## __VA_ARGS__);            \
+} while (0)
+
+#define PNOR(lvl, msg, ...) do {                                      \
+    PPRE;                                                             \
+    fprintf(stderr, "%s.%06ld " lvl ": " msg "\n",                    \
+            timebuf, ts.tv_nsec / 1000, ## __VA_ARGS__);              \
+} while (0)
+
+#ifdef VUS_DEBUG
+#define PDBG(msg, ...) PEXT("DBG", msg, ## __VA_ARGS__)
+#define PERR(msg, ...) PEXT("ERR", msg, ## __VA_ARGS__)
+#define PLOG(msg, ...) PEXT("LOG", msg, ## __VA_ARGS__)
+#else
+#define PDBG(msg, ...) { }
+#define PERR(msg, ...) PNOR("ERR", msg, ## __VA_ARGS__)
+#define PLOG(msg, ...) PNOR("LOG", msg, ## __VA_ARGS__)
+#endif
+
+/** vhost-user-scsi specific definitions **/
+
+ /* Only 1 LUN and device supported today */
+#define VUS_MAX_LUNS 1
+#define VUS_MAX_DEVS 1
+
+#define VUS_ISCSI_INITIATOR "iqn.2016-11.com.nutanix:vhost-user-scsi"
+
+typedef struct iscsi_lun {
+    struct iscsi_context *iscsi_ctx;
+    int iscsi_lun;
+} iscsi_lun_t;
+
+typedef struct vhost_scsi_dev {
+    VuDev vu_dev;
+    int server_sock;
+    GMainLoop *loop;
+    GTree *fdmap;   /* fd -> gsource context id */
+    iscsi_lun_t luns[VUS_MAX_LUNS];
+} vhost_scsi_dev_t;
+
+static vhost_scsi_dev_t *vhost_scsi_devs[VUS_MAX_DEVS];
+
+/** glib event loop integration for libvhost-user and misc callbacks **/
+
+QEMU_BUILD_BUG_ON((int)G_IO_IN != (int)VU_WATCH_IN);
+QEMU_BUILD_BUG_ON((int)G_IO_OUT != (int)VU_WATCH_OUT);
+QEMU_BUILD_BUG_ON((int)G_IO_PRI != (int)VU_WATCH_PRI);
+QEMU_BUILD_BUG_ON((int)G_IO_ERR != (int)VU_WATCH_ERR);
+QEMU_BUILD_BUG_ON((int)G_IO_HUP != (int)VU_WATCH_HUP);
+
+typedef struct vus_gsrc {
+    GSource parent;
+    vhost_scsi_dev_t *vdev_scsi;
+    GPollFD gfd;
+    vu_watch_cb vu_cb;
+} vus_gsrc_t;
+
+static gint vus_fdmap_compare(gconstpointer a, gconstpointer b)
+{
+    return (b > a) - (b < a);
+}
+
+static gboolean vus_gsrc_prepare(GSource *src, gint *timeout)
+{
+    assert(timeout);
+
+    *timeout = -1;
+    return FALSE;
+}
+
+static gboolean vus_gsrc_check(GSource *src)
+{
+    vus_gsrc_t *vus_src = (vus_gsrc_t *)src;
+
+    assert(vus_src);
+
+    return vus_src->gfd.revents & vus_src->gfd.events;
+}
+
+static gboolean vus_gsrc_dispatch(GSource *src, GSourceFunc cb, gpointer data)
+{
+    vhost_scsi_dev_t *vdev_scsi;
+    vus_gsrc_t *vus_src = (vus_gsrc_t *)src;
+
+    assert(vus_src);
+    assert(!(vus_src->vu_cb && cb));
+
+    vdev_scsi = vus_src->vdev_scsi;
+
+    assert(vdev_scsi);
+
+    if (cb) {
+        return cb(data);
+    }
+    if (vus_src->vu_cb) {
+        vus_src->vu_cb(&vdev_scsi->vu_dev, vus_src->gfd.revents, data);
+    }
+    return G_SOURCE_CONTINUE;
+}
+
+static GSourceFuncs vus_gsrc_funcs = {
+    vus_gsrc_prepare,
+    vus_gsrc_check,
+    vus_gsrc_dispatch,
+    NULL
+};
+
+static int vus_gsrc_new(vhost_scsi_dev_t *vdev_scsi, int fd, GIOCondition cond,
+                        vu_watch_cb vu_cb, GSourceFunc gsrc_cb, gpointer data)
+{
+    GSource *vus_gsrc;
+    vus_gsrc_t *vus_src;
+    guint id;
+
+    assert(vdev_scsi);
+    assert(fd >= 0);
+    assert(vu_cb || gsrc_cb);
+    assert(!(vu_cb && gsrc_cb));
+
+    vus_gsrc = g_source_new(&vus_gsrc_funcs, sizeof(vus_gsrc_t));
+    if (!vus_gsrc) {
+        PERR("Error creating GSource for new watch");
+        return -1;
+    }
+    vus_src = (vus_gsrc_t *)vus_gsrc;
+
+    vus_src->vdev_scsi = vdev_scsi;
+    vus_src->gfd.fd = fd;
+    vus_src->gfd.events = cond;
+    vus_src->vu_cb = vu_cb;
+
+    g_source_add_poll(vus_gsrc, &vus_src->gfd);
+    g_source_set_callback(vus_gsrc, gsrc_cb, data, NULL);
+    id = g_source_attach(vus_gsrc, NULL);
+    assert(id);
+    g_source_unref(vus_gsrc);
+
+    g_tree_insert(vdev_scsi->fdmap, (gpointer)(uintptr_t)fd,
+                                    (gpointer)(uintptr_t)id);
+
+    return 0;
+}
+
+/* from libiscsi's scsi-lowlevel.h **
+ *
+ * nb. We can't directly include scsi-lowlevel.h due to a namespace conflict:
+ *     QEMU's scsi.h also defines "SCSI_XFER_NONE".
+ */
+
+#define SCSI_CDB_MAX_SIZE           16
+
+struct scsi_iovector {
+    struct scsi_iovec *iov;
+    int niov;
+    int nalloc;
+    size_t offset;
+    int consumed;
+};
+
+struct scsi_allocated_memory {
+    struct scsi_allocated_memory *next;
+    char buf[0];
+};
+
+struct scsi_data {
+    int            size;
+    unsigned char *data;
+};
+
+enum scsi_sense_key {
+    SCSI_SENSE_NO_SENSE            = 0x00,
+    SCSI_SENSE_RECOVERED_ERROR     = 0x01,
+    SCSI_SENSE_NOT_READY           = 0x02,
+    SCSI_SENSE_MEDIUM_ERROR        = 0x03,
+    SCSI_SENSE_HARDWARE_ERROR      = 0x04,
+    SCSI_SENSE_ILLEGAL_REQUEST     = 0x05,
+    SCSI_SENSE_UNIT_ATTENTION      = 0x06,
+    SCSI_SENSE_DATA_PROTECTION     = 0x07,
+    SCSI_SENSE_BLANK_CHECK         = 0x08,
+    SCSI_SENSE_VENDOR_SPECIFIC     = 0x09,
+    SCSI_SENSE_COPY_ABORTED        = 0x0a,
+    SCSI_SENSE_COMMAND_ABORTED     = 0x0b,
+    SCSI_SENSE_OBSOLETE_ERROR_CODE = 0x0c,
+    SCSI_SENSE_OVERFLOW_COMMAND    = 0x0d,
+    SCSI_SENSE_MISCOMPARE          = 0x0e
+};
+
+struct scsi_sense {
+    unsigned char       error_type;
+    enum scsi_sense_key key;
+    int                 ascq;
+    unsigned            sense_specific:1;
+    unsigned            ill_param_in_cdb:1;
+    unsigned            bit_pointer_valid:1;
+    unsigned char       bit_pointer;
+    uint16_t            field_pointer;
+};
+
+enum scsi_residual {
+    SCSI_RESIDUAL_NO_RESIDUAL = 0,
+    SCSI_RESIDUAL_UNDERFLOW,
+    SCSI_RESIDUAL_OVERFLOW
+};
+
+struct scsi_task {
+    int status;
+    int cdb_size;
+    int xfer_dir;
+    int expxferlen;
+    unsigned char cdb[SCSI_CDB_MAX_SIZE];
+    enum scsi_residual residual_status;
+    size_t residual;
+    struct scsi_sense sense;
+    struct scsi_data datain;
+    struct scsi_allocated_memory *mem;
+    void *ptr;
+
+    uint32_t itt;
+    uint32_t cmdsn;
+    uint32_t lun;
+
+    struct scsi_iovector iovector_in;
+    struct scsi_iovector iovector_out;
+};
+
+/** libiscsi integration **/
+
+static int iscsi_add_lun(iscsi_lun_t *lun, char *iscsi_uri)
+{
+    struct iscsi_url *iscsi_url;
+    struct iscsi_context *iscsi_ctx;
+    int ret = 0;
+
+    assert(lun);
+    assert(iscsi_uri);
+
+    iscsi_ctx = iscsi_create_context(VUS_ISCSI_INITIATOR);
+    if (!iscsi_ctx) {
+        PERR("Unable to create iSCSI context");
+        return -1;
+    }
+
+    iscsi_url = iscsi_parse_full_url(iscsi_ctx, iscsi_uri);
+    if (!iscsi_url) {
+        PERR("Unable to parse iSCSI URL: %s", iscsi_get_error(iscsi_ctx));
+        goto fail;
+    }
+
+    iscsi_set_session_type(iscsi_ctx, ISCSI_SESSION_NORMAL);
+    iscsi_set_header_digest(iscsi_ctx, ISCSI_HEADER_DIGEST_NONE_CRC32C);
+    if (iscsi_full_connect_sync(iscsi_ctx, iscsi_url->portal, iscsi_url->lun)) {
+        PERR("Unable to login to iSCSI portal: %s", iscsi_get_error(iscsi_ctx));
+        goto fail;
+    }
+
+    lun->iscsi_ctx = iscsi_ctx;
+    lun->iscsi_lun = iscsi_url->lun;
+
+    PDBG("Context %p created for lun 0: %s", iscsi_ctx, iscsi_uri);
+
+out:
+    if (iscsi_url) {
+        iscsi_destroy_url(iscsi_url);
+    }
+    return ret;
+
+fail:
+    (void)iscsi_destroy_context(iscsi_ctx);
+    ret = -1;
+    goto out;
+}
+
+static struct scsi_task *scsi_task_new(int cdb_len, uint8_t *cdb, int dir,
+                                       int xfer_len) {
+    struct scsi_task *task;
+
+    assert(cdb_len > 0);
+    assert(cdb);
+
+    task = calloc(1, sizeof(struct scsi_task));
+    if (!task) {
+        PERR("Error allocating task: %s", strerror(errno));
+        return NULL;
+    }
+
+    memcpy(task->cdb, cdb, cdb_len);
+    task->cdb_size = cdb_len;
+    task->xfer_dir = dir;
+    task->expxferlen = xfer_len;
+
+    return task;
+}
+
+static int get_cdb_len(uint8_t *cdb)
+{
+    assert(cdb);
+
+    switch (cdb[0] >> 5) {
+    case 0: return 6;
+    case 1: /* fall through */
+    case 2: return 10;
+    case 4: return 16;
+    case 5: return 12;
+    }
+    PERR("Unable to determine cdb len (0x%02hhX)", cdb[0] >> 5);
+    return -1;
+}
+
+static int handle_cmd_sync(struct iscsi_context *ctx,
+                           VirtIOSCSICmdReq *req,
+                           struct iovec *out, unsigned int out_len,
+                           VirtIOSCSICmdResp *rsp,
+                           struct iovec *in, unsigned int in_len) {
+    struct scsi_task *task;
+    uint32_t dir;
+    uint32_t len;
+    int cdb_len;
+    int i;
+
+    assert(ctx);
+    assert(req);
+    assert(rsp);
+
+    if (!(!req->lun[1] && req->lun[2] == 0x40 && !req->lun[3])) {
+        /* Ignore anything different than target=0, lun=0 */
+        PDBG("Ignoring unconnected lun (0x%hhX, 0x%hhX)",
+             req->lun[1], req->lun[3]);
+        rsp->status = SCSI_STATUS_CHECK_CONDITION;
+        memset(rsp->sense, 0, sizeof(rsp->sense));
+        rsp->sense_len = 18;
+        rsp->sense[0] = 0x70;
+        rsp->sense[2] = SCSI_SENSE_ILLEGAL_REQUEST;
+        rsp->sense[7] = 10;
+        rsp->sense[12] = 0x24;
+
+        return 0;
+    }
+
+    cdb_len = get_cdb_len(req->cdb);
+    if (cdb_len == -1) {
+        return -1;
+    }
+
+    len = 0;
+    if (!out_len && !in_len) {
+        dir = SCSI_XFER_NONE;
+    } else if (out_len) {
+        dir = SCSI_XFER_TO_DEV;
+        for (i = 0; i < out_len; i++) {
+            len += out[i].iov_len;
+        }
+    } else {
+        dir = SCSI_XFER_FROM_DEV;
+        for (i = 0; i < in_len; i++) {
+            len += in[i].iov_len;
+        }
+    }
+
+    task = scsi_task_new(cdb_len, req->cdb, dir, len);
+    if (!task) {
+        PERR("Unable to create iscsi task");
+        return -1;
+    }
+
+    if (dir == SCSI_XFER_TO_DEV) {
+        task->iovector_out.iov = (struct scsi_iovec *)out;
+        task->iovector_out.niov = out_len;
+    } else if (dir == SCSI_XFER_FROM_DEV) {
+        task->iovector_in.iov = (struct scsi_iovec *)in;
+        task->iovector_in.niov = in_len;
+    }
+
+    PDBG("Sending iscsi cmd (cdb_len=%d, dir=%d, task=%p)",
+         cdb_len, dir, task);
+    if (!iscsi_scsi_command_sync(ctx, 0, task, NULL)) {
+        PERR("Error serving SCSI command");
+        free(task);
+        return -1;
+    }
+
+    memset(rsp, 0, sizeof(*rsp));
+
+    rsp->status = task->status;
+    rsp->resid  = task->residual;
+
+    if (task->status == SCSI_STATUS_CHECK_CONDITION) {
+        rsp->response = VIRTIO_SCSI_S_FAILURE;
+        rsp->sense_len = task->datain.size - 2;
+        memcpy(rsp->sense, &task->datain.data[2], rsp->sense_len);
+    }
+
+    free(task);
+
+    PDBG("Filled in rsp: status=%hhX, resid=%u, response=%hhX, sense_len=%u",
+         rsp->status, rsp->resid, rsp->response, rsp->sense_len);
+
+    return 0;
+}
+
+/** libvhost-user callbacks **/
+
+static vhost_scsi_dev_t *vdev_scsi_find_by_vu(VuDev *vu_dev);
+
+static void vus_panic_cb(VuDev *vu_dev, const char *buf)
+{
+    vhost_scsi_dev_t *vdev_scsi;
+
+    assert(vu_dev);
+
+    vdev_scsi = vdev_scsi_find_by_vu(vu_dev);
+
+    if (buf) {
+        PERR("vu_panic: %s", buf);
+    }
+
+    if (vdev_scsi) {
+        assert(vdev_scsi->loop);
+        g_main_loop_quit(vdev_scsi->loop);
+    }
+}
+
+static void vus_add_watch_cb(VuDev *vu_dev, int fd, int vu_evt, vu_watch_cb cb,
+                             void *pvt) {
+    vhost_scsi_dev_t *vdev_scsi;
+    guint id;
+
+    assert(vu_dev);
+    assert(fd >= 0);
+    assert(cb);
+
+    vdev_scsi = vdev_scsi_find_by_vu(vu_dev);
+    if (!vdev_scsi) {
+        vus_panic_cb(vu_dev, NULL);
+        return;
+    }
+
+    id = (guint)(uintptr_t)g_tree_lookup(vdev_scsi->fdmap,
+                                         (gpointer)(uintptr_t)fd);
+    if (id) {
+        GSource *vus_src = g_main_context_find_source_by_id(NULL, id);
+        assert(vus_src);
+        g_source_destroy(vus_src);
+        (void)g_tree_remove(vdev_scsi->fdmap, (gpointer)(uintptr_t)fd);
+    }
+
+    if (vus_gsrc_new(vdev_scsi, fd, vu_evt, cb, NULL, pvt)) {
+        vus_panic_cb(vu_dev, NULL);
+    }
+}
+
+static void vus_del_watch_cb(VuDev *vu_dev, int fd)
+{
+    vhost_scsi_dev_t *vdev_scsi;
+    guint id;
+
+    assert(vu_dev);
+    assert(fd >= 0);
+
+    vdev_scsi = vdev_scsi_find_by_vu(vu_dev);
+    if (!vdev_scsi) {
+        vus_panic_cb(vu_dev, NULL);
+        return;
+    }
+
+    id = (guint)(uintptr_t)g_tree_lookup(vdev_scsi->fdmap,
+                                         (gpointer)(uintptr_t)fd);
+    if (id) {
+        GSource *vus_src = g_main_context_find_source_by_id(NULL, id);
+        assert(vus_src);
+        g_source_destroy(vus_src);
+        (void)g_tree_remove(vdev_scsi->fdmap, (gpointer)(uintptr_t)fd);
+    }
+}
+
+static void vus_proc_ctl(VuDev *vu_dev, int idx)
+{
+    /* Control VQ not implemented */
+}
+
+static void vus_proc_evt(VuDev *vu_dev, int idx)
+{
+    /* Event VQ not implemented */
+}
+
+static void vus_proc_req(VuDev *vu_dev, int idx)
+{
+    vhost_scsi_dev_t *vdev_scsi;
+    VuVirtq *vq;
+
+    assert(vu_dev);
+
+    vdev_scsi = vdev_scsi_find_by_vu(vu_dev);
+    if (!vdev_scsi) {
+        vus_panic_cb(vu_dev, NULL);
+        return;
+    }
+
+    if ((idx < 0) || (idx >= VHOST_MAX_NR_VIRTQUEUE)) {
+        PERR("VQ Index out of range: %d", idx);
+        vus_panic_cb(vu_dev, NULL);
+        return;
+    }
+
+    vq = vu_get_queue(vu_dev, idx);
+    if (!vq) {
+        PERR("Error fetching VQ (dev=%p, idx=%d)", vu_dev, idx);
+        vus_panic_cb(vu_dev, NULL);
+        return;
+    }
+
+    PDBG("Got kicked on vq[%d]@%p", idx, vq);
+
+    while (1) {
+        VuVirtqElement *elem;
+        VirtIOSCSICmdReq *req;
+        VirtIOSCSICmdResp *rsp;
+
+        elem = vu_queue_pop(vu_dev, vq, sizeof(VuVirtqElement));
+        if (!elem) {
+            PDBG("No more elements pending on vq[%d]@%p", idx, vq);
+            break;
+        }
+        PDBG("Popped elem@%p", elem);
+
+        assert(!((elem->out_num > 1) && (elem->in_num > 1)));
+        assert((elem->out_num > 0) && (elem->in_num > 0));
+
+        if (elem->out_sg[0].iov_len < sizeof(VirtIOSCSICmdReq)) {
+            PERR("Invalid virtio-scsi req header");
+            vus_panic_cb(vu_dev, NULL);
+            break;
+        }
+        req = (VirtIOSCSICmdReq *)elem->out_sg[0].iov_base;
+
+        if (elem->in_sg[0].iov_len < sizeof(VirtIOSCSICmdResp)) {
+            PERR("Invalid virtio-scsi rsp header");
+            vus_panic_cb(vu_dev, NULL);
+            break;
+        }
+        rsp = (VirtIOSCSICmdResp *)elem->in_sg[0].iov_base;
+
+        if (handle_cmd_sync(vdev_scsi->luns[0].iscsi_ctx,
+                            req, &elem->out_sg[1], elem->out_num - 1,
+                            rsp, &elem->in_sg[1], elem->in_num - 1) != 0) {
+            vus_panic_cb(vu_dev, NULL);
+            break;
+        }
+
+        vu_queue_push(vu_dev, vq, elem, 0);
+        vu_queue_notify(vu_dev, vq);
+
+        free(elem);
+    }
+}
+
+static void vus_queue_set_started(VuDev *vu_dev, int idx, bool started)
+{
+    VuVirtq *vq;
+
+    assert(vu_dev);
+
+    if ((idx < 0) || (idx >= VHOST_MAX_NR_VIRTQUEUE)) {
+        PERR("VQ Index out of range: %d", idx);
+        vus_panic_cb(vu_dev, NULL);
+        return;
+    }
+
+    vq = vu_get_queue(vu_dev, idx);
+
+    switch (idx) {
+    case 0:
+        vu_set_queue_handler(vu_dev, vq, started ? vus_proc_ctl : NULL);
+        break;
+    case 1:
+        vu_set_queue_handler(vu_dev, vq, started ? vus_proc_evt : NULL);
+        break;
+    default:
+        vu_set_queue_handler(vu_dev, vq, started ? vus_proc_req : NULL);
+    }
+}
+
+static const VuDevIface vus_iface = {
+    .queue_set_started = vus_queue_set_started,
+};
+
+static gboolean vus_vhost_cb(gpointer data)
+{
+    VuDev *vu_dev = (VuDev *)data;
+
+    assert(vu_dev);
+
+    if (!vu_dispatch(vu_dev) != 0) {
+        PERR("Error processing vhost message");
+        vus_panic_cb(vu_dev, NULL);
+        return G_SOURCE_REMOVE;
+    }
+
+    return G_SOURCE_CONTINUE;
+}
+
+/** misc helpers **/
+
+static int unix_sock_new(char *unix_fn)
+{
+    int sock;
+    struct sockaddr_un un;
+    size_t len;
+
+    assert(unix_fn);
+
+    sock = socket(AF_UNIX, SOCK_STREAM, 0);
+    if (sock <= 0) {
+        perror("socket");
+        return -1;
+    }
+
+    un.sun_family = AF_UNIX;
+    (void)snprintf(un.sun_path, sizeof(un.sun_path), "%s", unix_fn);
+    len = sizeof(un.sun_family) + strlen(un.sun_path);
+
+    (void)unlink(unix_fn);
+    if (bind(sock, (struct sockaddr *)&un, len) < 0) {
+        perror("bind");
+        goto fail;
+    }
+
+    if (listen(sock, 1) < 0) {
+        perror("listen");
+        goto fail;
+    }
+
+    return sock;
+
+fail:
+    (void)close(sock);
+
+    return -1;
+}
+
+/** vhost-user-scsi **/
+
+static vhost_scsi_dev_t *vdev_scsi_find_by_vu(VuDev *vu_dev)
+{
+    int i;
+
+    assert(vu_dev);
+
+    for (i = 0; i < VUS_MAX_DEVS; i++) {
+        if (&vhost_scsi_devs[i]->vu_dev == vu_dev) {
+            return vhost_scsi_devs[i];
+        }
+    }
+
+    PERR("Unknown VuDev %p", vu_dev);
+    return NULL;
+}
+
+static void vdev_scsi_deinit(vhost_scsi_dev_t *vdev_scsi)
+{
+    if (!vdev_scsi) {
+        return;
+    }
+
+    if (vdev_scsi->server_sock >= 0) {
+        struct sockaddr_storage ss;
+        socklen_t sslen = sizeof(ss);
+
+        if (getsockname(vdev_scsi->server_sock, (struct sockaddr *)&ss,
+                        &sslen) == 0) {
+            struct sockaddr_un *su = (struct sockaddr_un *)&ss;
+            (void)unlink(su->sun_path);
+        }
+
+        (void)close(vdev_scsi->server_sock);
+        vdev_scsi->server_sock = -1;
+    }
+
+    if (vdev_scsi->loop) {
+        g_main_loop_unref(vdev_scsi->loop);
+        vdev_scsi->loop = NULL;
+    }
+}
+
+static vhost_scsi_dev_t *vdev_scsi_new(char *unix_fn)
+{
+    vhost_scsi_dev_t *vdev_scsi = NULL;
+
+    assert(unix_fn);
+
+    vdev_scsi = calloc(1, sizeof(vhost_scsi_dev_t));
+    if (!vdev_scsi) {
+        PERR("calloc: %s", strerror(errno));
+        return NULL;
+    }
+
+    vdev_scsi->server_sock = unix_sock_new(unix_fn);
+    if (vdev_scsi->server_sock < 0) {
+        goto err;
+    }
+
+    vdev_scsi->loop = g_main_loop_new(NULL, FALSE);
+    if (!vdev_scsi->loop) {
+        PERR("Error creating glib event loop");
+        goto err;
+    }
+
+    vdev_scsi->fdmap = g_tree_new(vus_fdmap_compare);
+    if (!vdev_scsi->fdmap) {
+        PERR("Error creating glib tree for fdmap");
+        goto err;
+    }
+
+    return vdev_scsi;
+
+err:
+    vdev_scsi_deinit(vdev_scsi);
+    free(vdev_scsi);
+
+    return NULL;
+}
+
+static int vdev_scsi_add_iscsi_lun(vhost_scsi_dev_t *vdev_scsi,
+                                   char *iscsi_uri, uint32_t lun) {
+    assert(vdev_scsi);
+    assert(iscsi_uri);
+    assert(lun < VUS_MAX_LUNS);
+
+    if (vdev_scsi->luns[lun].iscsi_ctx) {
+        PERR("Lun %d already configured", lun);
+        return -1;
+    }
+
+    if (iscsi_add_lun(&vdev_scsi->luns[lun], iscsi_uri) != 0) {
+        return -1;
+    }
+
+    return 0;
+}
+
+static int vdev_scsi_run(vhost_scsi_dev_t *vdev_scsi)
+{
+    int cli_sock;
+    int ret = 0;
+
+    assert(vdev_scsi);
+    assert(vdev_scsi->server_sock >= 0);
+    assert(vdev_scsi->loop);
+
+    cli_sock = accept(vdev_scsi->server_sock, (void *)0, (void *)0);
+    if (cli_sock < 0) {
+        perror("accept");
+        return -1;
+    }
+
+    vu_init(&vdev_scsi->vu_dev,
+            cli_sock,
+            vus_panic_cb,
+            vus_add_watch_cb,
+            vus_del_watch_cb,
+            &vus_iface);
+
+    if (vus_gsrc_new(vdev_scsi, cli_sock, G_IO_IN, NULL, vus_vhost_cb,
+                     &vdev_scsi->vu_dev)) {
+        goto fail;
+    }
+
+    g_main_loop_run(vdev_scsi->loop);
+
+out:
+    vu_deinit(&vdev_scsi->vu_dev);
+
+    return ret;
+
+fail:
+    ret = -1;
+    goto out;
+}
+
+int main(int argc, char **argv)
+{
+    vhost_scsi_dev_t *vdev_scsi = NULL;
+    char *unix_fn = NULL;
+    char *iscsi_uri = NULL;
+    int opt, err = EXIT_SUCCESS;
+
+    while ((opt = getopt(argc, argv, "u:i:")) != -1) {
+        switch (opt) {
+        case 'h':
+            goto help;
+        case 'u':
+            unix_fn = strdup(optarg);
+            break;
+        case 'i':
+            iscsi_uri = strdup(optarg);
+            break;
+        default:
+            goto help;
+        }
+    }
+    if (!unix_fn || !iscsi_uri) {
+        goto help;
+    }
+
+    vdev_scsi = vdev_scsi_new(unix_fn);
+    if (!vdev_scsi) {
+        goto err;
+    }
+    vhost_scsi_devs[0] = vdev_scsi;
+
+    if (vdev_scsi_add_iscsi_lun(vdev_scsi, iscsi_uri, 0) != 0) {
+        goto err;
+    }
+
+    if (vdev_scsi_run(vdev_scsi) != 0) {
+        goto err;
+    }
+
+out:
+    if (vdev_scsi) {
+        vdev_scsi_deinit(vdev_scsi);
+        free(vdev_scsi);
+    }
+    if (unix_fn) {
+        free(unix_fn);
+    }
+    if (iscsi_uri) {
+        free(iscsi_uri);
+    }
+
+    return err;
+
+err:
+    err = EXIT_FAILURE;
+    goto out;
+
+help:
+    fprintf(stderr, "Usage: %s [ -u unix_sock_path -i iscsi_uri ] | [ -h ]\n",
+            argv[0]);
+    fprintf(stderr, "          -u path to unix socket\n");
+    fprintf(stderr, "          -i iscsi uri for lun 0\n");
+    fprintf(stderr, "          -h print help and quit\n");
+
+    goto err;
+}
diff --git a/default-configs/pci.mak b/default-configs/pci.mak
index 3bbeb62..53ff109 100644
--- a/default-configs/pci.mak
+++ b/default-configs/pci.mak
@@ -43,3 +43,4 @@ CONFIG_VGA=y
 CONFIG_VGA_PCI=y
 CONFIG_IVSHMEM=$(CONFIG_EVENTFD)
 CONFIG_ROCKER=y
+CONFIG_VHOST_USER_SCSI=$(CONFIG_LINUX)
diff --git a/default-configs/s390x-softmmu.mak b/default-configs/s390x-softmmu.mak
index 18aed56..b227a36 100644
--- a/default-configs/s390x-softmmu.mak
+++ b/default-configs/s390x-softmmu.mak
@@ -1,5 +1,6 @@
 CONFIG_PCI=y
 CONFIG_VIRTIO_PCI=y
+CONFIG_VHOST_USER_SCSI=$(CONFIG_LINUX)
 CONFIG_VIRTIO=y
 CONFIG_SCLPCONSOLE=y
 CONFIG_TERMINAL3270=y
diff --git a/docs/specs/parallels.txt b/docs/interop/parallels.txt
index e9271eb..e9271eb 100644
--- a/docs/specs/parallels.txt
+++ b/docs/interop/parallels.txt
diff --git a/docs/specs/qcow2.txt b/docs/interop/qcow2.txt
index 80cdfd0..80cdfd0 100644
--- a/docs/specs/qcow2.txt
+++ b/docs/interop/qcow2.txt
diff --git a/docs/specs/qed_spec.txt b/docs/interop/qed_spec.txt
index 7982e05..7982e05 100644
--- a/docs/specs/qed_spec.txt
+++ b/docs/interop/qed_spec.txt
diff --git a/docs/qemu-ga-ref.texi b/docs/interop/qemu-ga-ref.texi
index ddb76ce..ddb76ce 100644
--- a/docs/qemu-ga-ref.texi
+++ b/docs/interop/qemu-ga-ref.texi
diff --git a/docs/qemu-qmp-ref.texi b/docs/interop/qemu-qmp-ref.texi
index bb25758..bb25758 100644
--- a/docs/qemu-qmp-ref.texi
+++ b/docs/interop/qemu-qmp-ref.texi
diff --git a/docs/qmp-intro.txt b/docs/interop/qmp-intro.txt
index 60deafb..60deafb 100644
--- a/docs/qmp-intro.txt
+++ b/docs/interop/qmp-intro.txt
diff --git a/docs/qmp-spec.txt b/docs/interop/qmp-spec.txt
index f8b5356..f8b5356 100644
--- a/docs/qmp-spec.txt
+++ b/docs/interop/qmp-spec.txt
diff --git a/docs/specs/vhost-user.txt b/docs/interop/vhost-user.txt
index 481ab56..481ab56 100644
--- a/docs/specs/vhost-user.txt
+++ b/docs/interop/vhost-user.txt
diff --git a/docs/vnc-ledstate-Pseudo-encoding.txt b/docs/interop/vnc-ledstate-Pseudo-encoding.txt
index 0f124f6..0f124f6 100644
--- a/docs/vnc-ledstate-Pseudo-encoding.txt
+++ b/docs/interop/vnc-ledstate-Pseudo-encoding.txt
diff --git a/exec.c b/exec.c
index a93e209..42ad1ea 100644
--- a/exec.c
+++ b/exec.c
@@ -1482,25 +1482,17 @@ static int64_t get_file_size(int fd)
     return size;
 }
 
-static void *file_ram_alloc(RAMBlock *block,
-                            ram_addr_t memory,
-                            const char *path,
-                            Error **errp)
+static int file_ram_open(const char *path,
+                         const char *region_name,
+                         bool *created,
+                         Error **errp)
 {
-    bool unlink_on_error = false;
     char *filename;
     char *sanitized_name;
     char *c;
-    void *area = MAP_FAILED;
     int fd = -1;
-    int64_t file_size;
-
-    if (kvm_enabled() && !kvm_has_sync_mmu()) {
-        error_setg(errp,
-                   "host lacks kvm mmu notifiers, -mem-path unsupported");
-        return NULL;
-    }
 
+    *created = false;
     for (;;) {
         fd = open(path, O_RDWR);
         if (fd >= 0) {
@@ -1511,13 +1503,13 @@ static void *file_ram_alloc(RAMBlock *block,
             /* @path names a file that doesn't exist, create it */
             fd = open(path, O_RDWR | O_CREAT | O_EXCL, 0644);
             if (fd >= 0) {
-                unlink_on_error = true;
+                *created = true;
                 break;
             }
         } else if (errno == EISDIR) {
             /* @path names a directory, create a file there */
             /* Make name safe to use with mkstemp by replacing '/' with '_'. */
-            sanitized_name = g_strdup(memory_region_name(block->mr));
+            sanitized_name = g_strdup(region_name);
             for (c = sanitized_name; *c != '\0'; c++) {
                 if (*c == '/') {
                     *c = '_';
@@ -1540,7 +1532,7 @@ static void *file_ram_alloc(RAMBlock *block,
             error_setg_errno(errp, errno,
                              "can't open backing store %s for guest RAM",
                              path);
-            goto error;
+            return -1;
         }
         /*
          * Try again on EINTR and EEXIST.  The latter happens when
@@ -1548,6 +1540,17 @@ static void *file_ram_alloc(RAMBlock *block,
          */
     }
 
+    return fd;
+}
+
+static void *file_ram_alloc(RAMBlock *block,
+                            ram_addr_t memory,
+                            int fd,
+                            bool truncate,
+                            Error **errp)
+{
+    void *area;
+
     block->page_size = qemu_fd_getpagesize(fd);
     block->mr->align = block->page_size;
 #if defined(__s390x__)
@@ -1556,20 +1559,11 @@ static void *file_ram_alloc(RAMBlock *block,
     }
 #endif
 
-    file_size = get_file_size(fd);
-
     if (memory < block->page_size) {
         error_setg(errp, "memory size 0x" RAM_ADDR_FMT " must be equal to "
                    "or larger than page size 0x%zx",
                    memory, block->page_size);
-        goto error;
-    }
-
-    if (file_size > 0 && file_size < memory) {
-        error_setg(errp, "backing store %s size 0x%" PRIx64
-                   " does not match 'size' option 0x" RAM_ADDR_FMT,
-                   path, file_size, memory);
-        goto error;
+        return NULL;
     }
 
     memory = ROUND_UP(memory, block->page_size);
@@ -1588,7 +1582,7 @@ static void *file_ram_alloc(RAMBlock *block,
      * those labels. Therefore, extending the non-empty backend file
      * is disabled as well.
      */
-    if (!file_size && ftruncate(fd, memory)) {
+    if (truncate && ftruncate(fd, memory)) {
         perror("ftruncate");
     }
 
@@ -1597,30 +1591,19 @@ static void *file_ram_alloc(RAMBlock *block,
     if (area == MAP_FAILED) {
         error_setg_errno(errp, errno,
                          "unable to map backing store for guest RAM");
-        goto error;
+        return NULL;
     }
 
     if (mem_prealloc) {
         os_mem_prealloc(fd, area, memory, smp_cpus, errp);
         if (errp && *errp) {
-            goto error;
+            qemu_ram_munmap(area, memory);
+            return NULL;
         }
     }
 
     block->fd = fd;
     return area;
-
-error:
-    if (area != MAP_FAILED) {
-        qemu_ram_munmap(area, memory);
-    }
-    if (unlink_on_error) {
-        unlink(path);
-    }
-    if (fd != -1) {
-        close(fd);
-    }
-    return NULL;
 }
 #endif
 
@@ -1931,18 +1914,25 @@ static void ram_block_add(RAMBlock *new_block, Error **errp)
 }
 
 #ifdef __linux__
-RAMBlock *qemu_ram_alloc_from_file(ram_addr_t size, MemoryRegion *mr,
-                                   bool share, const char *mem_path,
-                                   Error **errp)
+RAMBlock *qemu_ram_alloc_from_fd(ram_addr_t size, MemoryRegion *mr,
+                                 bool share, int fd,
+                                 Error **errp)
 {
     RAMBlock *new_block;
     Error *local_err = NULL;
+    int64_t file_size;
 
     if (xen_enabled()) {
         error_setg(errp, "-mem-path not supported with Xen");
         return NULL;
     }
 
+    if (kvm_enabled() && !kvm_has_sync_mmu()) {
+        error_setg(errp,
+                   "host lacks kvm mmu notifiers, -mem-path unsupported");
+        return NULL;
+    }
+
     if (phys_mem_alloc != qemu_anon_ram_alloc) {
         /*
          * file_ram_alloc() needs to allocate just like
@@ -1955,13 +1945,20 @@ RAMBlock *qemu_ram_alloc_from_file(ram_addr_t size, MemoryRegion *mr,
     }
 
     size = HOST_PAGE_ALIGN(size);
+    file_size = get_file_size(fd);
+    if (file_size > 0 && file_size < size) {
+        error_setg(errp, "backing store %s size 0x%" PRIx64
+                   " does not match 'size' option 0x" RAM_ADDR_FMT,
+                   mem_path, file_size, size);
+        return NULL;
+    }
+
     new_block = g_malloc0(sizeof(*new_block));
     new_block->mr = mr;
     new_block->used_length = size;
     new_block->max_length = size;
     new_block->flags = share ? RAM_SHARED : 0;
-    new_block->host = file_ram_alloc(new_block, size,
-                                     mem_path, errp);
+    new_block->host = file_ram_alloc(new_block, size, fd, !file_size, errp);
     if (!new_block->host) {
         g_free(new_block);
         return NULL;
@@ -1974,6 +1971,33 @@ RAMBlock *qemu_ram_alloc_from_file(ram_addr_t size, MemoryRegion *mr,
         return NULL;
     }
     return new_block;
+
+}
+
+
+RAMBlock *qemu_ram_alloc_from_file(ram_addr_t size, MemoryRegion *mr,
+                                   bool share, const char *mem_path,
+                                   Error **errp)
+{
+    int fd;
+    bool created;
+    RAMBlock *block;
+
+    fd = file_ram_open(mem_path, memory_region_name(mr), &created, errp);
+    if (fd < 0) {
+        return NULL;
+    }
+
+    block = qemu_ram_alloc_from_fd(size, mr, share, fd, errp);
+    if (!block) {
+        if (created) {
+            unlink(mem_path);
+        }
+        close(fd);
+        return NULL;
+    }
+
+    return block;
 }
 #endif
 
diff --git a/hw/misc/ivshmem.c b/hw/misc/ivshmem.c
index 6367d04..2f0819d 100644
--- a/hw/misc/ivshmem.c
+++ b/hw/misc/ivshmem.c
@@ -491,9 +491,9 @@ static void setup_interrupt(IVShmemState *s, int vector, Error **errp)
 
 static void process_msg_shmem(IVShmemState *s, int fd, Error **errp)
 {
+    Error *local_err = NULL;
     struct stat buf;
     size_t size;
-    void *ptr;
 
     if (s->ivshmem_bar2) {
         error_setg(errp, "server sent unexpected shared memory message");
@@ -522,15 +522,13 @@ static void process_msg_shmem(IVShmemState *s, int fd, Error **errp)
     }
 
     /* mmap the region and map into the BAR2 */
-    ptr = mmap(0, size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
-    if (ptr == MAP_FAILED) {
-        error_setg_errno(errp, errno, "Failed to mmap shared memory");
-        close(fd);
+    memory_region_init_ram_from_fd(&s->server_bar2, OBJECT(s),
+                                   "ivshmem.bar2", size, true, fd, &local_err);
+    if (local_err) {
+        error_propagate(errp, local_err);
         return;
     }
-    memory_region_init_ram_ptr(&s->server_bar2, OBJECT(s),
-                               "ivshmem.bar2", size, ptr);
-    memory_region_set_fd(&s->server_bar2, fd);
+
     s->ivshmem_bar2 = &s->server_bar2;
 }
 
diff --git a/hw/scsi/Makefile.objs b/hw/scsi/Makefile.objs
index 54d8754..b188f72 100644
--- a/hw/scsi/Makefile.objs
+++ b/hw/scsi/Makefile.objs
@@ -11,4 +11,5 @@ obj-$(CONFIG_PSERIES) += spapr_vscsi.o
 ifeq ($(CONFIG_VIRTIO),y)
 obj-y += virtio-scsi.o virtio-scsi-dataplane.o
 obj-$(CONFIG_VHOST_SCSI) += vhost-scsi-common.o vhost-scsi.o
+obj-$(CONFIG_VHOST_USER_SCSI) += vhost-scsi-common.o vhost-user-scsi.o
 endif
diff --git a/hw/scsi/megasas.c b/hw/scsi/megasas.c
index 804122a..734fdae 100644
--- a/hw/scsi/megasas.c
+++ b/hw/scsi/megasas.c
@@ -63,6 +63,7 @@ typedef struct MegasasCmd {
 
     hwaddr pa;
     hwaddr pa_size;
+    uint32_t dcmd_opcode;
     union mfi_frame *frame;
     SCSIRequest *req;
     QEMUSGList qsg;
@@ -309,9 +310,11 @@ static int megasas_build_sense(MegasasCmd *cmd, uint8_t *sense_ptr,
     PCIDevice *pcid = PCI_DEVICE(cmd->state);
     uint32_t pa_hi = 0, pa_lo;
     hwaddr pa;
+    int frame_sense_len;
 
-    if (sense_len > cmd->frame->header.sense_len) {
-        sense_len = cmd->frame->header.sense_len;
+    frame_sense_len = cmd->frame->header.sense_len;
+    if (sense_len > frame_sense_len) {
+        sense_len = frame_sense_len;
     }
     if (sense_len) {
         pa_lo = le32_to_cpu(cmd->frame->pass.sense_addr_lo);
@@ -511,6 +514,7 @@ static MegasasCmd *megasas_enqueue_frame(MegasasState *s,
         cmd->context &= (uint64_t)0xFFFFFFFF;
     }
     cmd->count = count;
+    cmd->dcmd_opcode = -1;
     s->busy++;
 
     if (s->consumer_pa) {
@@ -605,6 +609,9 @@ static void megasas_reset_frames(MegasasState *s)
 static void megasas_abort_command(MegasasCmd *cmd)
 {
     /* Never abort internal commands.  */
+    if (cmd->dcmd_opcode != -1) {
+        return;
+    }
     if (cmd->req != NULL) {
         scsi_req_cancel(cmd->req);
     }
@@ -673,15 +680,16 @@ out:
 static int megasas_map_dcmd(MegasasState *s, MegasasCmd *cmd)
 {
     dma_addr_t iov_pa, iov_size;
+    int iov_count;
 
     cmd->flags = le16_to_cpu(cmd->frame->header.flags);
-    if (!cmd->frame->header.sge_count) {
+    iov_count = cmd->frame->header.sge_count;
+    if (!iov_count) {
         trace_megasas_dcmd_zero_sge(cmd->index);
         cmd->iov_size = 0;
         return 0;
-    } else if (cmd->frame->header.sge_count > 1) {
-        trace_megasas_dcmd_invalid_sge(cmd->index,
-                                       cmd->frame->header.sge_count);
+    } else if (iov_count > 1) {
+        trace_megasas_dcmd_invalid_sge(cmd->index, iov_count);
         cmd->iov_size = 0;
         return -EINVAL;
     }
@@ -1012,7 +1020,6 @@ static int megasas_pd_get_info_submit(SCSIDevice *sdev, int lun,
     uint64_t pd_size;
     uint16_t pd_id = ((sdev->id & 0xFF) << 8) | (lun & 0xFF);
     uint8_t cmdbuf[6];
-    SCSIRequest *req;
     size_t len, resid;
 
     if (!cmd->iov_buf) {
@@ -1021,8 +1028,8 @@ static int megasas_pd_get_info_submit(SCSIDevice *sdev, int lun,
         info->inquiry_data[0] = 0x7f; /* Force PQual 0x3, PType 0x1f */
         info->vpd_page83[0] = 0x7f;
         megasas_setup_inquiry(cmdbuf, 0, sizeof(info->inquiry_data));
-        req = scsi_req_new(sdev, cmd->index, lun, cmdbuf, cmd);
-        if (!req) {
+        cmd->req = scsi_req_new(sdev, cmd->index, lun, cmdbuf, cmd);
+        if (!cmd->req) {
             trace_megasas_dcmd_req_alloc_failed(cmd->index,
                                                 "PD get info std inquiry");
             g_free(cmd->iov_buf);
@@ -1031,26 +1038,26 @@ static int megasas_pd_get_info_submit(SCSIDevice *sdev, int lun,
         }
         trace_megasas_dcmd_internal_submit(cmd->index,
                                            "PD get info std inquiry", lun);
-        len = scsi_req_enqueue(req);
+        len = scsi_req_enqueue(cmd->req);
         if (len > 0) {
             cmd->iov_size = len;
-            scsi_req_continue(req);
+            scsi_req_continue(cmd->req);
         }
         return MFI_STAT_INVALID_STATUS;
     } else if (info->inquiry_data[0] != 0x7f && info->vpd_page83[0] == 0x7f) {
         megasas_setup_inquiry(cmdbuf, 0x83, sizeof(info->vpd_page83));
-        req = scsi_req_new(sdev, cmd->index, lun, cmdbuf, cmd);
-        if (!req) {
+        cmd->req = scsi_req_new(sdev, cmd->index, lun, cmdbuf, cmd);
+        if (!cmd->req) {
             trace_megasas_dcmd_req_alloc_failed(cmd->index,
                                                 "PD get info vpd inquiry");
             return MFI_STAT_FLASH_ALLOC_FAIL;
         }
         trace_megasas_dcmd_internal_submit(cmd->index,
                                            "PD get info vpd inquiry", lun);
-        len = scsi_req_enqueue(req);
+        len = scsi_req_enqueue(cmd->req);
         if (len > 0) {
             cmd->iov_size = len;
-            scsi_req_continue(req);
+            scsi_req_continue(cmd->req);
         }
         return MFI_STAT_INVALID_STATUS;
     }
@@ -1212,7 +1219,6 @@ static int megasas_ld_get_info_submit(SCSIDevice *sdev, int lun,
     struct mfi_ld_info *info = cmd->iov_buf;
     size_t dcmd_size = sizeof(struct mfi_ld_info);
     uint8_t cdb[6];
-    SCSIRequest *req;
     ssize_t len, resid;
     uint16_t sdev_id = ((sdev->id & 0xFF) << 8) | (lun & 0xFF);
     uint64_t ld_size;
@@ -1221,8 +1227,8 @@ static int megasas_ld_get_info_submit(SCSIDevice *sdev, int lun,
         cmd->iov_buf = g_malloc0(dcmd_size);
         info = cmd->iov_buf;
         megasas_setup_inquiry(cdb, 0x83, sizeof(info->vpd_page83));
-        req = scsi_req_new(sdev, cmd->index, lun, cdb, cmd);
-        if (!req) {
+        cmd->req = scsi_req_new(sdev, cmd->index, lun, cdb, cmd);
+        if (!cmd->req) {
             trace_megasas_dcmd_req_alloc_failed(cmd->index,
                                                 "LD get info vpd inquiry");
             g_free(cmd->iov_buf);
@@ -1231,10 +1237,10 @@ static int megasas_ld_get_info_submit(SCSIDevice *sdev, int lun,
         }
         trace_megasas_dcmd_internal_submit(cmd->index,
                                            "LD get info vpd inquiry", lun);
-        len = scsi_req_enqueue(req);
+        len = scsi_req_enqueue(cmd->req);
         if (len > 0) {
             cmd->iov_size = len;
-            scsi_req_continue(req);
+            scsi_req_continue(cmd->req);
         }
         return MFI_STAT_INVALID_STATUS;
     }
@@ -1559,22 +1565,21 @@ static const struct dcmd_cmd_tbl_t {
 
 static int megasas_handle_dcmd(MegasasState *s, MegasasCmd *cmd)
 {
-    int opcode;
     int retval = 0;
     size_t len;
     const struct dcmd_cmd_tbl_t *cmdptr = dcmd_cmd_tbl;
 
-    opcode = le32_to_cpu(cmd->frame->dcmd.opcode);
-    trace_megasas_handle_dcmd(cmd->index, opcode);
+    cmd->dcmd_opcode = le32_to_cpu(cmd->frame->dcmd.opcode);
+    trace_megasas_handle_dcmd(cmd->index, cmd->dcmd_opcode);
     if (megasas_map_dcmd(s, cmd) < 0) {
         return MFI_STAT_MEMORY_NOT_AVAILABLE;
     }
-    while (cmdptr->opcode != -1 && cmdptr->opcode != opcode) {
+    while (cmdptr->opcode != -1 && cmdptr->opcode != cmd->dcmd_opcode) {
         cmdptr++;
     }
     len = cmd->iov_size;
     if (cmdptr->opcode == -1) {
-        trace_megasas_dcmd_unhandled(cmd->index, opcode, len);
+        trace_megasas_dcmd_unhandled(cmd->index, cmd->dcmd_opcode, len);
         retval = megasas_dcmd_dummy(s, cmd);
     } else {
         trace_megasas_dcmd_enter(cmd->index, cmdptr->desc, len);
@@ -1587,15 +1592,14 @@ static int megasas_handle_dcmd(MegasasState *s, MegasasCmd *cmd)
 }
 
 static int megasas_finish_internal_dcmd(MegasasCmd *cmd,
-                                        SCSIRequest *req)
+                                        SCSIRequest *req, size_t resid)
 {
-    int opcode;
     int retval = MFI_STAT_OK;
     int lun = req->lun;
 
-    opcode = le32_to_cpu(cmd->frame->dcmd.opcode);
-    trace_megasas_dcmd_internal_finish(cmd->index, opcode, lun);
-    switch (opcode) {
+    trace_megasas_dcmd_internal_finish(cmd->index, cmd->dcmd_opcode, lun);
+    cmd->iov_size -= resid;
+    switch (cmd->dcmd_opcode) {
     case MFI_DCMD_PD_GET_INFO:
         retval = megasas_pd_get_info_submit(req->dev, lun, cmd);
         break;
@@ -1603,7 +1607,7 @@ static int megasas_finish_internal_dcmd(MegasasCmd *cmd,
         retval = megasas_ld_get_info_submit(req->dev, lun, cmd);
         break;
     default:
-        trace_megasas_dcmd_internal_invalid(cmd->index, opcode);
+        trace_megasas_dcmd_internal_invalid(cmd->index, cmd->dcmd_opcode);
         retval = MFI_STAT_INVALID_DCMD;
         break;
     }
@@ -1647,43 +1651,42 @@ static int megasas_enqueue_req(MegasasCmd *cmd, bool is_write)
 }
 
 static int megasas_handle_scsi(MegasasState *s, MegasasCmd *cmd,
-                               bool is_logical)
+                               int frame_cmd)
 {
     uint8_t *cdb;
+    int target_id, lun_id, cdb_len;
     bool is_write;
     struct SCSIDevice *sdev = NULL;
+    bool is_logical = (frame_cmd == MFI_CMD_LD_SCSI_IO);
 
     cdb = cmd->frame->pass.cdb;
+    target_id = cmd->frame->header.target_id;
+    lun_id = cmd->frame->header.lun_id;
+    cdb_len = cmd->frame->header.cdb_len;
 
     if (is_logical) {
-        if (cmd->frame->header.target_id >= MFI_MAX_LD ||
-            cmd->frame->header.lun_id != 0) {
+        if (target_id >= MFI_MAX_LD || lun_id != 0) {
             trace_megasas_scsi_target_not_present(
-                mfi_frame_desc[cmd->frame->header.frame_cmd], is_logical,
-                cmd->frame->header.target_id, cmd->frame->header.lun_id);
+                mfi_frame_desc[frame_cmd], is_logical, target_id, lun_id);
             return MFI_STAT_DEVICE_NOT_FOUND;
         }
     }
-    sdev = scsi_device_find(&s->bus, 0, cmd->frame->header.target_id,
-                            cmd->frame->header.lun_id);
+    sdev = scsi_device_find(&s->bus, 0, target_id, lun_id);
 
     cmd->iov_size = le32_to_cpu(cmd->frame->header.data_len);
-    trace_megasas_handle_scsi(mfi_frame_desc[cmd->frame->header.frame_cmd],
-                              is_logical, cmd->frame->header.target_id,
-                              cmd->frame->header.lun_id, sdev, cmd->iov_size);
+    trace_megasas_handle_scsi(mfi_frame_desc[frame_cmd], is_logical,
+                              target_id, lun_id, sdev, cmd->iov_size);
 
     if (!sdev || (megasas_is_jbod(s) && is_logical)) {
         trace_megasas_scsi_target_not_present(
-            mfi_frame_desc[cmd->frame->header.frame_cmd], is_logical,
-            cmd->frame->header.target_id, cmd->frame->header.lun_id);
+            mfi_frame_desc[frame_cmd], is_logical, target_id, lun_id);
         return MFI_STAT_DEVICE_NOT_FOUND;
     }
 
-    if (cmd->frame->header.cdb_len > 16) {
+    if (cdb_len > 16) {
         trace_megasas_scsi_invalid_cdb_len(
-                mfi_frame_desc[cmd->frame->header.frame_cmd], is_logical,
-                cmd->frame->header.target_id, cmd->frame->header.lun_id,
-                cmd->frame->header.cdb_len);
+                mfi_frame_desc[frame_cmd], is_logical,
+                target_id, lun_id, cdb_len);
         megasas_write_sense(cmd, SENSE_CODE(INVALID_OPCODE));
         cmd->frame->header.scsi_status = CHECK_CONDITION;
         s->event_count++;
@@ -1697,12 +1700,10 @@ static int megasas_handle_scsi(MegasasState *s, MegasasCmd *cmd,
         return MFI_STAT_SCSI_DONE_WITH_ERROR;
     }
 
-    cmd->req = scsi_req_new(sdev, cmd->index,
-                            cmd->frame->header.lun_id, cdb, cmd);
+    cmd->req = scsi_req_new(sdev, cmd->index, lun_id, cdb, cmd);
     if (!cmd->req) {
         trace_megasas_scsi_req_alloc_failed(
-                mfi_frame_desc[cmd->frame->header.frame_cmd],
-                cmd->frame->header.target_id, cmd->frame->header.lun_id);
+                mfi_frame_desc[frame_cmd], target_id, lun_id);
         megasas_write_sense(cmd, SENSE_CODE(NO_SENSE));
         cmd->frame->header.scsi_status = BUSY;
         s->event_count++;
@@ -1723,43 +1724,41 @@ static int megasas_handle_scsi(MegasasState *s, MegasasCmd *cmd,
     return MFI_STAT_INVALID_STATUS;
 }
 
-static int megasas_handle_io(MegasasState *s, MegasasCmd *cmd)
+static int megasas_handle_io(MegasasState *s, MegasasCmd *cmd, int frame_cmd)
 {
     uint32_t lba_count, lba_start_hi, lba_start_lo;
     uint64_t lba_start;
-    bool is_write = (cmd->frame->header.frame_cmd == MFI_CMD_LD_WRITE);
+    bool is_write = (frame_cmd == MFI_CMD_LD_WRITE);
     uint8_t cdb[16];
     int len;
     struct SCSIDevice *sdev = NULL;
+    int target_id, lun_id, cdb_len;
 
     lba_count = le32_to_cpu(cmd->frame->io.header.data_len);
     lba_start_lo = le32_to_cpu(cmd->frame->io.lba_lo);
     lba_start_hi = le32_to_cpu(cmd->frame->io.lba_hi);
     lba_start = ((uint64_t)lba_start_hi << 32) | lba_start_lo;
 
-    if (cmd->frame->header.target_id < MFI_MAX_LD &&
-        cmd->frame->header.lun_id == 0) {
-        sdev = scsi_device_find(&s->bus, 0, cmd->frame->header.target_id,
-                                cmd->frame->header.lun_id);
+    target_id = cmd->frame->header.target_id;
+    lun_id = cmd->frame->header.lun_id;
+    cdb_len = cmd->frame->header.cdb_len;
+
+    if (target_id < MFI_MAX_LD && lun_id == 0) {
+        sdev = scsi_device_find(&s->bus, 0, target_id, lun_id);
     }
 
     trace_megasas_handle_io(cmd->index,
-                            mfi_frame_desc[cmd->frame->header.frame_cmd],
-                            cmd->frame->header.target_id,
-                            cmd->frame->header.lun_id,
+                            mfi_frame_desc[frame_cmd], target_id, lun_id,
                             (unsigned long)lba_start, (unsigned long)lba_count);
     if (!sdev) {
         trace_megasas_io_target_not_present(cmd->index,
-            mfi_frame_desc[cmd->frame->header.frame_cmd],
-            cmd->frame->header.target_id, cmd->frame->header.lun_id);
+            mfi_frame_desc[frame_cmd], target_id, lun_id);
         return MFI_STAT_DEVICE_NOT_FOUND;
     }
 
-    if (cmd->frame->header.cdb_len > 16) {
+    if (cdb_len > 16) {
         trace_megasas_scsi_invalid_cdb_len(
-            mfi_frame_desc[cmd->frame->header.frame_cmd], 1,
-            cmd->frame->header.target_id, cmd->frame->header.lun_id,
-            cmd->frame->header.cdb_len);
+            mfi_frame_desc[frame_cmd], 1, target_id, lun_id, cdb_len);
         megasas_write_sense(cmd, SENSE_CODE(INVALID_OPCODE));
         cmd->frame->header.scsi_status = CHECK_CONDITION;
         s->event_count++;
@@ -1776,11 +1775,10 @@ static int megasas_handle_io(MegasasState *s, MegasasCmd *cmd)
 
     megasas_encode_lba(cdb, lba_start, lba_count, is_write);
     cmd->req = scsi_req_new(sdev, cmd->index,
-                            cmd->frame->header.lun_id, cdb, cmd);
+                            lun_id, cdb, cmd);
     if (!cmd->req) {
         trace_megasas_scsi_req_alloc_failed(
-            mfi_frame_desc[cmd->frame->header.frame_cmd],
-            cmd->frame->header.target_id, cmd->frame->header.lun_id);
+            mfi_frame_desc[frame_cmd], target_id, lun_id);
         megasas_write_sense(cmd, SENSE_CODE(NO_SENSE));
         cmd->frame->header.scsi_status = BUSY;
         s->event_count++;
@@ -1797,23 +1795,11 @@ static int megasas_handle_io(MegasasState *s, MegasasCmd *cmd)
     return MFI_STAT_INVALID_STATUS;
 }
 
-static int megasas_finish_internal_command(MegasasCmd *cmd,
-                                           SCSIRequest *req, size_t resid)
-{
-    int retval = MFI_STAT_INVALID_CMD;
-
-    if (cmd->frame->header.frame_cmd == MFI_CMD_DCMD) {
-        cmd->iov_size -= resid;
-        retval = megasas_finish_internal_dcmd(cmd, req);
-    }
-    return retval;
-}
-
 static QEMUSGList *megasas_get_sg_list(SCSIRequest *req)
 {
     MegasasCmd *cmd = req->hba_private;
 
-    if (cmd->frame->header.frame_cmd == MFI_CMD_DCMD) {
+    if (cmd->dcmd_opcode != -1) {
         return NULL;
     } else {
         return &cmd->qsg;
@@ -1824,18 +1810,16 @@ static void megasas_xfer_complete(SCSIRequest *req, uint32_t len)
 {
     MegasasCmd *cmd = req->hba_private;
     uint8_t *buf;
-    uint32_t opcode;
 
     trace_megasas_io_complete(cmd->index, len);
 
-    if (cmd->frame->header.frame_cmd != MFI_CMD_DCMD) {
+    if (cmd->dcmd_opcode != -1) {
         scsi_req_continue(req);
         return;
     }
 
     buf = scsi_req_get_buf(req);
-    opcode = le32_to_cpu(cmd->frame->dcmd.opcode);
-    if (opcode == MFI_DCMD_PD_GET_INFO && cmd->iov_buf) {
+    if (cmd->dcmd_opcode == MFI_DCMD_PD_GET_INFO && cmd->iov_buf) {
         struct mfi_pd_info *info = cmd->iov_buf;
 
         if (info->inquiry_data[0] == 0x7f) {
@@ -1846,7 +1830,7 @@ static void megasas_xfer_complete(SCSIRequest *req, uint32_t len)
             memcpy(info->vpd_page83, buf, len);
         }
         scsi_req_continue(req);
-    } else if (opcode == MFI_DCMD_LD_GET_INFO) {
+    } else if (cmd->dcmd_opcode == MFI_DCMD_LD_GET_INFO) {
         struct mfi_ld_info *info = cmd->iov_buf;
 
         if (cmd->iov_buf) {
@@ -1868,11 +1852,11 @@ static void megasas_command_complete(SCSIRequest *req, uint32_t status,
         return;
     }
 
-    if (cmd->req == NULL) {
+    if (cmd->dcmd_opcode != -1) {
         /*
          * Internal command complete
          */
-        cmd_status = megasas_finish_internal_command(cmd, req, resid);
+        cmd_status = megasas_finish_internal_dcmd(cmd, req, resid);
         if (cmd_status == MFI_STAT_INVALID_STATUS) {
             return;
         }
@@ -1943,6 +1927,7 @@ static void megasas_handle_frame(MegasasState *s, uint64_t frame_addr,
 {
     uint8_t frame_status = MFI_STAT_INVALID_CMD;
     uint64_t frame_context;
+    int frame_cmd;
     MegasasCmd *cmd;
 
     /*
@@ -1961,7 +1946,8 @@ static void megasas_handle_frame(MegasasState *s, uint64_t frame_addr,
         s->event_count++;
         return;
     }
-    switch (cmd->frame->header.frame_cmd) {
+    frame_cmd = cmd->frame->header.frame_cmd;
+    switch (frame_cmd) {
     case MFI_CMD_INIT:
         frame_status = megasas_init_firmware(s, cmd);
         break;
@@ -1972,18 +1958,15 @@ static void megasas_handle_frame(MegasasState *s, uint64_t frame_addr,
         frame_status = megasas_handle_abort(s, cmd);
         break;
     case MFI_CMD_PD_SCSI_IO:
-        frame_status = megasas_handle_scsi(s, cmd, 0);
-        break;
     case MFI_CMD_LD_SCSI_IO:
-        frame_status = megasas_handle_scsi(s, cmd, 1);
+        frame_status = megasas_handle_scsi(s, cmd, frame_cmd);
         break;
     case MFI_CMD_LD_READ:
     case MFI_CMD_LD_WRITE:
-        frame_status = megasas_handle_io(s, cmd);
+        frame_status = megasas_handle_io(s, cmd, frame_cmd);
         break;
     default:
-        trace_megasas_unhandled_frame_cmd(cmd->index,
-                                          cmd->frame->header.frame_cmd);
+        trace_megasas_unhandled_frame_cmd(cmd->index, frame_cmd);
         s->event_count++;
         break;
     }
diff --git a/hw/scsi/vhost-scsi-common.c b/hw/scsi/vhost-scsi-common.c
index e41c031..d434b3e 100644
--- a/hw/scsi/vhost-scsi-common.c
+++ b/hw/scsi/vhost-scsi-common.c
@@ -16,7 +16,6 @@
  */
 
 #include "qemu/osdep.h"
-#include <linux/vhost.h>
 #include "qapi/error.h"
 #include "qemu/error-report.h"
 #include "migration/migration.h"
diff --git a/hw/scsi/vhost-user-scsi.c b/hw/scsi/vhost-user-scsi.c
new file mode 100644
index 0000000..500fa6a
--- /dev/null
+++ b/hw/scsi/vhost-user-scsi.c
@@ -0,0 +1,205 @@
+/*
+ * vhost-user-scsi host device
+ *
+ * Copyright (c) 2016 Nutanix Inc. All rights reserved.
+ *
+ * Author:
+ *  Felipe Franciosi <felipe@nutanix.com>
+ *
+ * This work is largely based on the "vhost-scsi" implementation by:
+ *  Stefan Hajnoczi    <stefanha@linux.vnet.ibm.com>
+ *  Nicholas Bellinger <nab@risingtidesystems.com>
+ *
+ * This work is licensed under the terms of the GNU LGPL, version 2 or later.
+ * See the COPYING.LIB file in the top-level directory.
+ *
+ */
+
+#include "qemu/osdep.h"
+#include "qapi/error.h"
+#include "qemu/error-report.h"
+#include "qemu/typedefs.h"
+#include "qom/object.h"
+#include "hw/fw-path-provider.h"
+#include "hw/qdev-core.h"
+#include "hw/virtio/vhost.h"
+#include "hw/virtio/vhost-backend.h"
+#include "hw/virtio/vhost-user-scsi.h"
+#include "hw/virtio/virtio.h"
+#include "hw/virtio/virtio-access.h"
+#include "chardev/char-fe.h"
+
+/* Features supported by the host application */
+static const int user_feature_bits[] = {
+    VIRTIO_F_NOTIFY_ON_EMPTY,
+    VIRTIO_RING_F_INDIRECT_DESC,
+    VIRTIO_RING_F_EVENT_IDX,
+    VIRTIO_SCSI_F_HOTPLUG,
+    VHOST_INVALID_FEATURE_BIT
+};
+
+static void vhost_user_scsi_set_status(VirtIODevice *vdev, uint8_t status)
+{
+    VHostUserSCSI *s = (VHostUserSCSI *)vdev;
+    VHostSCSICommon *vsc = VHOST_SCSI_COMMON(s);
+    bool start = (status & VIRTIO_CONFIG_S_DRIVER_OK) && vdev->vm_running;
+
+    if (vsc->dev.started == start) {
+        return;
+    }
+
+    if (start) {
+        int ret;
+
+        ret = vhost_scsi_common_start(vsc);
+        if (ret < 0) {
+            error_report("unable to start vhost-user-scsi: %s", strerror(-ret));
+            exit(1);
+        }
+    } else {
+        vhost_scsi_common_stop(vsc);
+    }
+}
+
+static void vhost_dummy_handle_output(VirtIODevice *vdev, VirtQueue *vq)
+{
+}
+
+static void vhost_user_scsi_realize(DeviceState *dev, Error **errp)
+{
+    VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(dev);
+    VHostUserSCSI *s = VHOST_USER_SCSI(dev);
+    VHostSCSICommon *vsc = VHOST_SCSI_COMMON(s);
+    Error *err = NULL;
+    int ret;
+
+    if (!vs->conf.chardev.chr) {
+        error_setg(errp, "vhost-user-scsi: missing chardev");
+        return;
+    }
+
+    virtio_scsi_common_realize(dev, vhost_dummy_handle_output,
+                               vhost_dummy_handle_output,
+                               vhost_dummy_handle_output, &err);
+    if (err != NULL) {
+        error_propagate(errp, err);
+        return;
+    }
+
+    vsc->dev.nvqs = 2 + vs->conf.num_queues;
+    vsc->dev.vqs = g_new(struct vhost_virtqueue, vsc->dev.nvqs);
+    vsc->dev.vq_index = 0;
+    vsc->dev.backend_features = 0;
+
+    ret = vhost_dev_init(&vsc->dev, (void *)&vs->conf.chardev,
+                         VHOST_BACKEND_TYPE_USER, 0);
+    if (ret < 0) {
+        error_setg(errp, "vhost-user-scsi: vhost initialization failed: %s",
+                   strerror(-ret));
+        return;
+    }
+
+    /* Channel and lun both are 0 for bootable vhost-user-scsi disk */
+    vsc->channel = 0;
+    vsc->lun = 0;
+    vsc->target = vs->conf.boot_tpgt;
+}
+
+static void vhost_user_scsi_unrealize(DeviceState *dev, Error **errp)
+{
+    VirtIODevice *vdev = VIRTIO_DEVICE(dev);
+    VHostUserSCSI *s = VHOST_USER_SCSI(dev);
+    VHostSCSICommon *vsc = VHOST_SCSI_COMMON(s);
+
+    /* This will stop the vhost backend. */
+    vhost_user_scsi_set_status(vdev, 0);
+
+    vhost_dev_cleanup(&vsc->dev);
+    g_free(vsc->dev.vqs);
+
+    virtio_scsi_common_unrealize(dev, errp);
+}
+
+static uint64_t vhost_user_scsi_get_features(VirtIODevice *vdev,
+                                             uint64_t features, Error **errp)
+{
+    VHostUserSCSI *s = VHOST_USER_SCSI(vdev);
+
+    /* Turn on predefined features supported by this device */
+    features |= s->host_features;
+
+    return vhost_scsi_common_get_features(vdev, features, errp);
+}
+
+static Property vhost_user_scsi_properties[] = {
+    DEFINE_PROP_CHR("chardev", VirtIOSCSICommon, conf.chardev),
+    DEFINE_PROP_UINT32("boot_tpgt", VirtIOSCSICommon, conf.boot_tpgt, 0),
+    DEFINE_PROP_UINT32("num_queues", VirtIOSCSICommon, conf.num_queues, 1),
+    DEFINE_PROP_UINT32("max_sectors", VirtIOSCSICommon, conf.max_sectors,
+                       0xFFFF),
+    DEFINE_PROP_UINT32("cmd_per_lun", VirtIOSCSICommon, conf.cmd_per_lun, 128),
+    DEFINE_PROP_BIT64("hotplug", VHostUserSCSI, host_features,
+                                                VIRTIO_SCSI_F_HOTPLUG,
+                                                true),
+    DEFINE_PROP_BIT64("param_change", VHostUserSCSI, host_features,
+                                                     VIRTIO_SCSI_F_CHANGE,
+                                                     true),
+    DEFINE_PROP_END_OF_LIST(),
+};
+
+static const VMStateDescription vmstate_vhost_scsi = {
+    .name = "virtio-scsi",
+    .minimum_version_id = 1,
+    .version_id = 1,
+    .fields = (VMStateField[]) {
+        VMSTATE_VIRTIO_DEVICE,
+        VMSTATE_END_OF_LIST()
+    },
+};
+
+static void vhost_user_scsi_class_init(ObjectClass *klass, void *data)
+{
+    DeviceClass *dc = DEVICE_CLASS(klass);
+    VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass);
+    FWPathProviderClass *fwc = FW_PATH_PROVIDER_CLASS(klass);
+
+    dc->props = vhost_user_scsi_properties;
+    dc->vmsd = &vmstate_vhost_scsi;
+    set_bit(DEVICE_CATEGORY_STORAGE, dc->categories);
+    vdc->realize = vhost_user_scsi_realize;
+    vdc->unrealize = vhost_user_scsi_unrealize;
+    vdc->get_features = vhost_user_scsi_get_features;
+    vdc->set_config = vhost_scsi_common_set_config;
+    vdc->set_status = vhost_user_scsi_set_status;
+    fwc->get_dev_path = vhost_scsi_common_get_fw_dev_path;
+}
+
+static void vhost_user_scsi_instance_init(Object *obj)
+{
+    VHostSCSICommon *vsc = VHOST_SCSI_COMMON(obj);
+
+    vsc->feature_bits = user_feature_bits;
+
+    /* Add the bootindex property for this object */
+    device_add_bootindex_property(obj, &vsc->bootindex, "bootindex", NULL,
+                                  DEVICE(vsc), NULL);
+}
+
+static const TypeInfo vhost_user_scsi_info = {
+    .name = TYPE_VHOST_USER_SCSI,
+    .parent = TYPE_VHOST_SCSI_COMMON,
+    .instance_size = sizeof(VHostUserSCSI),
+    .class_init = vhost_user_scsi_class_init,
+    .instance_init = vhost_user_scsi_instance_init,
+    .interfaces = (InterfaceInfo[]) {
+        { TYPE_FW_PATH_PROVIDER },
+        { }
+    },
+};
+
+static void virtio_register_types(void)
+{
+    type_register_static(&vhost_user_scsi_info);
+}
+
+type_init(virtio_register_types)
diff --git a/hw/virtio/virtio-pci.c b/hw/virtio/virtio-pci.c
index f9b7244..20d6a08 100644
--- a/hw/virtio/virtio-pci.c
+++ b/hw/virtio/virtio-pci.c
@@ -2135,6 +2135,61 @@ static const TypeInfo vhost_scsi_pci_info = {
 };
 #endif
 
+#ifdef CONFIG_LINUX
+/* vhost-user-scsi-pci */
+static Property vhost_user_scsi_pci_properties[] = {
+    DEFINE_PROP_UINT32("vectors", VirtIOPCIProxy, nvectors,
+                       DEV_NVECTORS_UNSPECIFIED),
+    DEFINE_PROP_END_OF_LIST(),
+};
+
+static void vhost_user_scsi_pci_realize(VirtIOPCIProxy *vpci_dev, Error **errp)
+{
+    VHostUserSCSIPCI *dev = VHOST_USER_SCSI_PCI(vpci_dev);
+    DeviceState *vdev = DEVICE(&dev->vdev);
+    VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(vdev);
+
+    if (vpci_dev->nvectors == DEV_NVECTORS_UNSPECIFIED) {
+        vpci_dev->nvectors = vs->conf.num_queues + 3;
+    }
+
+    qdev_set_parent_bus(vdev, BUS(&vpci_dev->bus));
+    object_property_set_bool(OBJECT(vdev), true, "realized", errp);
+}
+
+static void vhost_user_scsi_pci_class_init(ObjectClass *klass, void *data)
+{
+    DeviceClass *dc = DEVICE_CLASS(klass);
+    VirtioPCIClass *k = VIRTIO_PCI_CLASS(klass);
+    PCIDeviceClass *pcidev_k = PCI_DEVICE_CLASS(klass);
+    k->realize = vhost_user_scsi_pci_realize;
+    set_bit(DEVICE_CATEGORY_STORAGE, dc->categories);
+    dc->props = vhost_user_scsi_pci_properties;
+    pcidev_k->vendor_id = PCI_VENDOR_ID_REDHAT_QUMRANET;
+    pcidev_k->device_id = PCI_DEVICE_ID_VIRTIO_SCSI;
+    pcidev_k->revision = 0x00;
+    pcidev_k->class_id = PCI_CLASS_STORAGE_SCSI;
+}
+
+static void vhost_user_scsi_pci_instance_init(Object *obj)
+{
+    VHostUserSCSIPCI *dev = VHOST_USER_SCSI_PCI(obj);
+
+    virtio_instance_init_common(obj, &dev->vdev, sizeof(dev->vdev),
+                                TYPE_VHOST_USER_SCSI);
+    object_property_add_alias(obj, "bootindex", OBJECT(&dev->vdev),
+                              "bootindex", &error_abort);
+}
+
+static const TypeInfo vhost_user_scsi_pci_info = {
+    .name          = TYPE_VHOST_USER_SCSI_PCI,
+    .parent        = TYPE_VIRTIO_PCI,
+    .instance_size = sizeof(VHostUserSCSIPCI),
+    .instance_init = vhost_user_scsi_pci_instance_init,
+    .class_init    = vhost_user_scsi_pci_class_init,
+};
+#endif
+
 /* vhost-vsock-pci */
 
 #ifdef CONFIG_VHOST_VSOCK
@@ -2612,6 +2667,9 @@ static void virtio_pci_register_types(void)
 #ifdef CONFIG_VHOST_SCSI
     type_register_static(&vhost_scsi_pci_info);
 #endif
+#ifdef CONFIG_LINUX
+    type_register_static(&vhost_user_scsi_pci_info);
+#endif
 #ifdef CONFIG_VHOST_VSOCK
     type_register_static(&vhost_vsock_pci_info);
 #endif
diff --git a/hw/virtio/virtio-pci.h b/hw/virtio/virtio-pci.h
index b095dfc..69f5959 100644
--- a/hw/virtio/virtio-pci.h
+++ b/hw/virtio/virtio-pci.h
@@ -26,6 +26,7 @@
 #include "hw/virtio/virtio-input.h"
 #include "hw/virtio/virtio-gpu.h"
 #include "hw/virtio/virtio-crypto.h"
+#include "hw/virtio/vhost-user-scsi.h"
 
 #ifdef CONFIG_VIRTFS
 #include "hw/9pfs/virtio-9p.h"
@@ -44,6 +45,7 @@ typedef struct VirtIOBalloonPCI VirtIOBalloonPCI;
 typedef struct VirtIOSerialPCI VirtIOSerialPCI;
 typedef struct VirtIONetPCI VirtIONetPCI;
 typedef struct VHostSCSIPCI VHostSCSIPCI;
+typedef struct VHostUserSCSIPCI VHostUserSCSIPCI;
 typedef struct VirtIORngPCI VirtIORngPCI;
 typedef struct VirtIOInputPCI VirtIOInputPCI;
 typedef struct VirtIOInputHIDPCI VirtIOInputHIDPCI;
@@ -230,6 +232,15 @@ struct VHostSCSIPCI {
 };
 #endif
 
+#define TYPE_VHOST_USER_SCSI_PCI "vhost-user-scsi-pci"
+#define VHOST_USER_SCSI_PCI(obj) \
+        OBJECT_CHECK(VHostUserSCSIPCI, (obj), TYPE_VHOST_USER_SCSI_PCI)
+
+struct VHostUserSCSIPCI {
+    VirtIOPCIProxy parent_obj;
+    VHostUserSCSI vdev;
+};
+
 /*
  * virtio-blk-pci: This extends VirtioPCIProxy.
  */
diff --git a/include/block/nbd.h b/include/block/nbd.h
index 416257a..6d75d5a 100644
--- a/include/block/nbd.h
+++ b/include/block/nbd.h
@@ -123,12 +123,8 @@ enum {
  * aren't overflowing some other buffer. */
 #define NBD_MAX_NAME_SIZE 256
 
-ssize_t nbd_wr_syncv(QIOChannel *ioc,
-                     struct iovec *iov,
-                     size_t niov,
-                     size_t length,
-                     bool do_read,
-                     Error **errp);
+ssize_t nbd_rwv(QIOChannel *ioc, struct iovec *iov, size_t niov, size_t length,
+                bool do_read, Error **errp);
 int nbd_receive_negotiate(QIOChannel *ioc, const char *name, uint16_t *flags,
                           QCryptoTLSCreds *tlscreds, const char *hostname,
                           QIOChannel **outioc,
@@ -162,7 +158,7 @@ void nbd_client_new(NBDExport *exp,
                     QIOChannelSocket *sioc,
                     QCryptoTLSCreds *tlscreds,
                     const char *tlsaclname,
-                    void (*close)(NBDClient *));
+                    void (*close_fn)(NBDClient *, bool));
 void nbd_client_get(NBDClient *client);
 void nbd_client_put(NBDClient *client);
 
diff --git a/include/exec/memory.h b/include/exec/memory.h
index 80e605a..37f8e78 100644
--- a/include/exec/memory.h
+++ b/include/exec/memory.h
@@ -456,6 +456,26 @@ void memory_region_init_ram_from_file(MemoryRegion *mr,
                                       bool share,
                                       const char *path,
                                       Error **errp);
+
+/**
+ * memory_region_init_ram_from_fd:  Initialize RAM memory region with a
+ *                                  mmap-ed backend.
+ *
+ * @mr: the #MemoryRegion to be initialized.
+ * @owner: the object that tracks the region's reference count
+ * @name: the name of the region.
+ * @size: size of the region.
+ * @share: %true if memory must be mmaped with the MAP_SHARED flag
+ * @fd: the fd to mmap.
+ * @errp: pointer to Error*, to store an error if it happens.
+ */
+void memory_region_init_ram_from_fd(MemoryRegion *mr,
+                                    struct Object *owner,
+                                    const char *name,
+                                    uint64_t size,
+                                    bool share,
+                                    int fd,
+                                    Error **errp);
 #endif
 
 /**
@@ -805,17 +825,6 @@ static inline bool memory_region_is_rom(MemoryRegion *mr)
 int memory_region_get_fd(MemoryRegion *mr);
 
 /**
- * memory_region_set_fd: Mark a RAM memory region as backed by a
- * file descriptor.
- *
- * This function is typically used after memory_region_init_ram_ptr().
- *
- * @mr: the memory region being queried.
- * @fd: the file descriptor that backs @mr.
- */
-void memory_region_set_fd(MemoryRegion *mr, int fd);
-
-/**
  * memory_region_from_host: Convert a pointer into a RAM memory region
  * and an offset within it.
  *
diff --git a/include/exec/poison.h b/include/exec/poison.h
index 3ca7929..5ffed4d 100644
--- a/include/exec/poison.h
+++ b/include/exec/poison.h
@@ -12,17 +12,28 @@
 #pragma GCC poison TARGET_CRIS
 #pragma GCC poison TARGET_LM32
 #pragma GCC poison TARGET_M68K
+#pragma GCC poison TARGET_MICROBLAZE
 #pragma GCC poison TARGET_MIPS
+#pragma GCC poison TARGET_ABI_MIPSO32
 #pragma GCC poison TARGET_MIPS64
+#pragma GCC poison TARGET_ABI_MIPSN64
+#pragma GCC poison TARGET_MOXIE
+#pragma GCC poison TARGET_NIOS2
 #pragma GCC poison TARGET_OPENRISC
 #pragma GCC poison TARGET_PPC
 #pragma GCC poison TARGET_PPCEMB
 #pragma GCC poison TARGET_PPC64
 #pragma GCC poison TARGET_ABI32
+#pragma GCC poison TARGET_S390X
 #pragma GCC poison TARGET_SH4
 #pragma GCC poison TARGET_SPARC
 #pragma GCC poison TARGET_SPARC64
+#pragma GCC poison TARGET_TRICORE
+#pragma GCC poison TARGET_UNICORE32
+#pragma GCC poison TARGET_XTENSA
 
+#pragma GCC poison TARGET_NAME
+#pragma GCC poison TARGET_SUPPORTS_MTTCG
 #pragma GCC poison TARGET_WORDS_BIGENDIAN
 #pragma GCC poison BSWAP_NEEDED
 
@@ -50,5 +61,25 @@
 #pragma GCC poison CPU_INTERRUPT_TGT_INT_1
 #pragma GCC poison CPU_INTERRUPT_TGT_INT_2
 
+#pragma GCC poison CONFIG_ALPHA_DIS
+#pragma GCC poison CONFIG_ARM_A64_DIS
+#pragma GCC poison CONFIG_ARM_DIS
+#pragma GCC poison CONFIG_CRIS_DIS
+#pragma GCC poison CONFIG_I386_DIS
+#pragma GCC poison CONFIG_LM32_DIS
+#pragma GCC poison CONFIG_M68K_DIS
+#pragma GCC poison CONFIG_MICROBLAZE_DIS
+#pragma GCC poison CONFIG_MIPS_DIS
+#pragma GCC poison CONFIG_MOXIE_DIS
+#pragma GCC poison CONFIG_NIOS2_DIS
+#pragma GCC poison CONFIG_PPC_DIS
+#pragma GCC poison CONFIG_S390_DIS
+#pragma GCC poison CONFIG_SH4_DIS
+#pragma GCC poison CONFIG_SPARC_DIS
+#pragma GCC poison CONFIG_XTENSA_DIS
+
+#pragma GCC poison CONFIG_LINUX_USER
+#pragma GCC poison CONFIG_VHOST_NET
+
 #endif
 #endif
diff --git a/include/exec/ram_addr.h b/include/exec/ram_addr.h
index 140efa8..73d1bea 100644
--- a/include/exec/ram_addr.h
+++ b/include/exec/ram_addr.h
@@ -65,6 +65,9 @@ unsigned long last_ram_page(void);
 RAMBlock *qemu_ram_alloc_from_file(ram_addr_t size, MemoryRegion *mr,
                                    bool share, const char *mem_path,
                                    Error **errp);
+RAMBlock *qemu_ram_alloc_from_fd(ram_addr_t size, MemoryRegion *mr,
+                                 bool share, int fd,
+                                 Error **errp);
 RAMBlock *qemu_ram_alloc_from_ptr(ram_addr_t size, void *host,
                                   MemoryRegion *mr, Error **errp);
 RAMBlock *qemu_ram_alloc(ram_addr_t size, MemoryRegion *mr, Error **errp);
diff --git a/include/hw/virtio/vhost-user-scsi.h b/include/hw/virtio/vhost-user-scsi.h
new file mode 100644
index 0000000..01861f7
--- /dev/null
+++ b/include/hw/virtio/vhost-user-scsi.h
@@ -0,0 +1,35 @@
+/*
+ * vhost-user-scsi host device
+ *
+ * Copyright (c) 2016 Nutanix Inc. All rights reserved.
+ *
+ * Author:
+ *  Felipe Franciosi <felipe@nutanix.com>
+ *
+ * This file is largely based on "vhost-scsi.h" by:
+ *  Stefan Hajnoczi   <stefanha@linux.vnet.ibm.com>
+ *
+ * This work is licensed under the terms of the GNU LGPL, version 2 or later.
+ * See the COPYING.LIB file in the top-level directory.
+ *
+ */
+
+#ifndef VHOST_USER_SCSI_H
+#define VHOST_USER_SCSI_H
+
+#include "qemu-common.h"
+#include "hw/qdev.h"
+#include "hw/virtio/virtio-scsi.h"
+#include "hw/virtio/vhost.h"
+#include "hw/virtio/vhost-scsi-common.h"
+
+#define TYPE_VHOST_USER_SCSI "vhost-user-scsi"
+#define VHOST_USER_SCSI(obj) \
+        OBJECT_CHECK(VHostUserSCSI, (obj), TYPE_VHOST_USER_SCSI)
+
+typedef struct VHostUserSCSI {
+    VHostSCSICommon parent_obj;
+    uint64_t host_features;
+} VHostUserSCSI;
+
+#endif /* VHOST_USER_SCSI_H */
diff --git a/include/hw/virtio/virtio-scsi.h b/include/hw/virtio/virtio-scsi.h
index eac2013..de6ae5a 100644
--- a/include/hw/virtio/virtio-scsi.h
+++ b/include/hw/virtio/virtio-scsi.h
@@ -21,6 +21,7 @@
 #include "hw/virtio/virtio.h"
 #include "hw/pci/pci.h"
 #include "hw/scsi/scsi.h"
+#include "chardev/char-fe.h"
 #include "sysemu/iothread.h"
 
 #define TYPE_VIRTIO_SCSI_COMMON "virtio-scsi-common"
@@ -53,6 +54,7 @@ struct VirtIOSCSIConf {
     char *vhostfd;
     char *wwpn;
 #endif
+    CharBackend chardev;
     uint32_t boot_tpgt;
     IOThread *iothread;
 };
diff --git a/memory.c b/memory.c
index 0ddc4cc..e08fa0a 100644
--- a/memory.c
+++ b/memory.c
@@ -1397,6 +1397,22 @@ void memory_region_init_ram_from_file(MemoryRegion *mr,
     mr->ram_block = qemu_ram_alloc_from_file(size, mr, share, path, errp);
     mr->dirty_log_mask = tcg_enabled() ? (1 << DIRTY_MEMORY_CODE) : 0;
 }
+
+void memory_region_init_ram_from_fd(MemoryRegion *mr,
+                                    struct Object *owner,
+                                    const char *name,
+                                    uint64_t size,
+                                    bool share,
+                                    int fd,
+                                    Error **errp)
+{
+    memory_region_init(mr, owner, name, size);
+    mr->ram = true;
+    mr->terminates = true;
+    mr->destructor = memory_region_destructor_ram;
+    mr->ram_block = qemu_ram_alloc_from_fd(size, mr, share, fd, errp);
+    mr->dirty_log_mask = tcg_enabled() ? (1 << DIRTY_MEMORY_CODE) : 0;
+}
 #endif
 
 void memory_region_init_ram_ptr(MemoryRegion *mr,
@@ -1835,16 +1851,6 @@ int memory_region_get_fd(MemoryRegion *mr)
     return fd;
 }
 
-void memory_region_set_fd(MemoryRegion *mr, int fd)
-{
-    rcu_read_lock();
-    while (mr->alias) {
-        mr = mr->alias;
-    }
-    mr->ram_block->fd = fd;
-    rcu_read_unlock();
-}
-
 void *memory_region_get_ram_ptr(MemoryRegion *mr)
 {
     void *ptr;
diff --git a/nbd/client.c b/nbd/client.c
index 595d99e..b97143f 100644
--- a/nbd/client.c
+++ b/nbd/client.c
@@ -86,32 +86,6 @@ static QTAILQ_HEAD(, NBDExport) exports = QTAILQ_HEAD_INITIALIZER(exports);
 
 */
 
-/* Discard length bytes from channel.  Return -errno on failure and 0 on
- * success*/
-static int drop_sync(QIOChannel *ioc, size_t size, Error **errp)
-{
-    ssize_t ret = 0;
-    char small[1024];
-    char *buffer;
-
-    buffer = sizeof(small) >= size ? small : g_malloc(MIN(65536, size));
-    while (size > 0) {
-        ssize_t count = MIN(65536, size);
-        ret = read_sync(ioc, buffer, MIN(65536, size), errp);
-
-        if (ret < 0) {
-            goto cleanup;
-        }
-        size -= count;
-    }
-
- cleanup:
-    if (buffer != small) {
-        g_free(buffer);
-    }
-    return ret;
-}
-
 /* Send an option request.
  *
  * The request is for option @opt, with @data containing @len bytes of
@@ -135,12 +109,12 @@ static int nbd_send_option_request(QIOChannel *ioc, uint32_t opt,
     stl_be_p(&req.option, opt);
     stl_be_p(&req.length, len);
 
-    if (write_sync(ioc, &req, sizeof(req), errp) < 0) {
+    if (nbd_write(ioc, &req, sizeof(req), errp) < 0) {
         error_prepend(errp, "Failed to send option request header");
         return -1;
     }
 
-    if (len && write_sync(ioc, (char *) data, len, errp) < 0) {
+    if (len && nbd_write(ioc, (char *) data, len, errp) < 0) {
         error_prepend(errp, "Failed to send option request data");
         return -1;
     }
@@ -169,7 +143,7 @@ static int nbd_receive_option_reply(QIOChannel *ioc, uint32_t opt,
                                     nbd_opt_reply *reply, Error **errp)
 {
     QEMU_BUILD_BUG_ON(sizeof(*reply) != 20);
-    if (read_sync(ioc, reply, sizeof(*reply), errp) < 0) {
+    if (nbd_read(ioc, reply, sizeof(*reply), errp) < 0) {
         error_prepend(errp, "failed to read option reply");
         nbd_send_opt_abort(ioc);
         return -1;
@@ -218,7 +192,7 @@ static int nbd_handle_reply_err(QIOChannel *ioc, nbd_opt_reply *reply,
             goto cleanup;
         }
         msg = g_malloc(reply->length + 1);
-        if (read_sync(ioc, msg, reply->length, errp) < 0) {
+        if (nbd_read(ioc, msg, reply->length, errp) < 0) {
             error_prepend(errp, "failed to read option error message");
             goto cleanup;
         }
@@ -320,7 +294,7 @@ static int nbd_receive_list(QIOChannel *ioc, const char *want, bool *match,
         nbd_send_opt_abort(ioc);
         return -1;
     }
-    if (read_sync(ioc, &namelen, sizeof(namelen), errp) < 0) {
+    if (nbd_read(ioc, &namelen, sizeof(namelen), errp) < 0) {
         error_prepend(errp, "failed to read option name length");
         nbd_send_opt_abort(ioc);
         return -1;
@@ -333,7 +307,7 @@ static int nbd_receive_list(QIOChannel *ioc, const char *want, bool *match,
         return -1;
     }
     if (namelen != strlen(want)) {
-        if (drop_sync(ioc, len, errp) < 0) {
+        if (nbd_drop(ioc, len, errp) < 0) {
             error_prepend(errp, "failed to skip export name with wrong length");
             nbd_send_opt_abort(ioc);
             return -1;
@@ -342,14 +316,14 @@ static int nbd_receive_list(QIOChannel *ioc, const char *want, bool *match,
     }
 
     assert(namelen < sizeof(name));
-    if (read_sync(ioc, name, namelen, errp) < 0) {
+    if (nbd_read(ioc, name, namelen, errp) < 0) {
         error_prepend(errp, "failed to read export name");
         nbd_send_opt_abort(ioc);
         return -1;
     }
     name[namelen] = '\0';
     len -= namelen;
-    if (drop_sync(ioc, len, errp) < 0) {
+    if (nbd_drop(ioc, len, errp) < 0) {
         error_prepend(errp, "failed to read export description");
         nbd_send_opt_abort(ioc);
         return -1;
@@ -476,7 +450,7 @@ int nbd_receive_negotiate(QIOChannel *ioc, const char *name, uint16_t *flags,
         goto fail;
     }
 
-    if (read_sync(ioc, buf, 8, errp) < 0) {
+    if (nbd_read(ioc, buf, 8, errp) < 0) {
         error_prepend(errp, "Failed to read data");
         goto fail;
     }
@@ -502,7 +476,7 @@ int nbd_receive_negotiate(QIOChannel *ioc, const char *name, uint16_t *flags,
         goto fail;
     }
 
-    if (read_sync(ioc, &magic, sizeof(magic), errp) < 0) {
+    if (nbd_read(ioc, &magic, sizeof(magic), errp) < 0) {
         error_prepend(errp, "Failed to read magic");
         goto fail;
     }
@@ -514,7 +488,7 @@ int nbd_receive_negotiate(QIOChannel *ioc, const char *name, uint16_t *flags,
         uint16_t globalflags;
         bool fixedNewStyle = false;
 
-        if (read_sync(ioc, &globalflags, sizeof(globalflags), errp) < 0) {
+        if (nbd_read(ioc, &globalflags, sizeof(globalflags), errp) < 0) {
             error_prepend(errp, "Failed to read server flags");
             goto fail;
         }
@@ -532,7 +506,7 @@ int nbd_receive_negotiate(QIOChannel *ioc, const char *name, uint16_t *flags,
         }
         /* client requested flags */
         clientflags = cpu_to_be32(clientflags);
-        if (write_sync(ioc, &clientflags, sizeof(clientflags), errp) < 0) {
+        if (nbd_write(ioc, &clientflags, sizeof(clientflags), errp) < 0) {
             error_prepend(errp, "Failed to send clientflags field");
             goto fail;
         }
@@ -570,13 +544,13 @@ int nbd_receive_negotiate(QIOChannel *ioc, const char *name, uint16_t *flags,
         }
 
         /* Read the response */
-        if (read_sync(ioc, &s, sizeof(s), errp) < 0) {
+        if (nbd_read(ioc, &s, sizeof(s), errp) < 0) {
             error_prepend(errp, "Failed to read export length");
             goto fail;
         }
         *size = be64_to_cpu(s);
 
-        if (read_sync(ioc, flags, sizeof(*flags), errp) < 0) {
+        if (nbd_read(ioc, flags, sizeof(*flags), errp) < 0) {
             error_prepend(errp, "Failed to read export flags");
             goto fail;
         }
@@ -593,14 +567,14 @@ int nbd_receive_negotiate(QIOChannel *ioc, const char *name, uint16_t *flags,
             goto fail;
         }
 
-        if (read_sync(ioc, &s, sizeof(s), errp) < 0) {
+        if (nbd_read(ioc, &s, sizeof(s), errp) < 0) {
             error_prepend(errp, "Failed to read export length");
             goto fail;
         }
         *size = be64_to_cpu(s);
         TRACE("Size is %" PRIu64, *size);
 
-        if (read_sync(ioc, &oldflags, sizeof(oldflags), errp) < 0) {
+        if (nbd_read(ioc, &oldflags, sizeof(oldflags), errp) < 0) {
             error_prepend(errp, "Failed to read export flags");
             goto fail;
         }
@@ -616,7 +590,7 @@ int nbd_receive_negotiate(QIOChannel *ioc, const char *name, uint16_t *flags,
     }
 
     TRACE("Size is %" PRIu64 ", export flags %" PRIx16, *size, *flags);
-    if (zeroes && drop_sync(ioc, 124, errp) < 0) {
+    if (zeroes && nbd_drop(ioc, 124, errp) < 0) {
         error_prepend(errp, "Failed to read reserved block");
         goto fail;
     }
@@ -759,7 +733,7 @@ ssize_t nbd_send_request(QIOChannel *ioc, NBDRequest *request)
     stq_be_p(buf + 16, request->from);
     stl_be_p(buf + 24, request->len);
 
-    return write_sync(ioc, buf, sizeof(buf), NULL);
+    return nbd_write(ioc, buf, sizeof(buf), NULL);
 }
 
 ssize_t nbd_receive_reply(QIOChannel *ioc, NBDReply *reply, Error **errp)
@@ -768,7 +742,7 @@ ssize_t nbd_receive_reply(QIOChannel *ioc, NBDReply *reply, Error **errp)
     uint32_t magic;
     ssize_t ret;
 
-    ret = read_sync_eof(ioc, buf, sizeof(buf), errp);
+    ret = nbd_read_eof(ioc, buf, sizeof(buf), errp);
     if (ret <= 0) {
         return ret;
     }
diff --git a/nbd/common.c b/nbd/common.c
index bd81637..6b5c1b7 100644
--- a/nbd/common.c
+++ b/nbd/common.c
@@ -24,12 +24,8 @@
  * The function may be called from coroutine or from non-coroutine context.
  * When called from non-coroutine context @ioc must be in blocking mode.
  */
-ssize_t nbd_wr_syncv(QIOChannel *ioc,
-                     struct iovec *iov,
-                     size_t niov,
-                     size_t length,
-                     bool do_read,
-                     Error **errp)
+ssize_t nbd_rwv(QIOChannel *ioc, struct iovec *iov, size_t niov, size_t length,
+                bool do_read, Error **errp)
 {
     ssize_t done = 0;
     struct iovec *local_iov = g_new(struct iovec, niov);
@@ -69,6 +65,32 @@ ssize_t nbd_wr_syncv(QIOChannel *ioc,
     return done;
 }
 
+/* Discard length bytes from channel.  Return -errno on failure and 0 on
+ * success */
+int nbd_drop(QIOChannel *ioc, size_t size, Error **errp)
+{
+    ssize_t ret = 0;
+    char small[1024];
+    char *buffer;
+
+    buffer = sizeof(small) >= size ? small : g_malloc(MIN(65536, size));
+    while (size > 0) {
+        ssize_t count = MIN(65536, size);
+        ret = nbd_read(ioc, buffer, MIN(65536, size), errp);
+
+        if (ret < 0) {
+            goto cleanup;
+        }
+        size -= count;
+    }
+
+ cleanup:
+    if (buffer != small) {
+        g_free(buffer);
+    }
+    return ret;
+}
+
 
 void nbd_tls_handshake(QIOTask *task,
                        void *opaque)
diff --git a/nbd/nbd-internal.h b/nbd/nbd-internal.h
index d607164..39bfed1 100644
--- a/nbd/nbd-internal.h
+++ b/nbd/nbd-internal.h
@@ -94,14 +94,14 @@
 #define NBD_ENOSPC     28
 #define NBD_ESHUTDOWN  108
 
-/* read_sync_eof
+/* nbd_read_eof
  * Tries to read @size bytes from @ioc. Returns number of bytes actually read.
  * May return a value >= 0 and < size only on EOF, i.e. when iteratively called
- * qio_channel_readv() returns 0. So, there are no needs to call read_sync_eof
+ * qio_channel_readv() returns 0. So, there is no need to call nbd_read_eof
  * iteratively.
  */
-static inline ssize_t read_sync_eof(QIOChannel *ioc, void *buffer, size_t size,
-                                    Error **errp)
+static inline ssize_t nbd_read_eof(QIOChannel *ioc, void *buffer, size_t size,
+                                   Error **errp)
 {
     struct iovec iov = { .iov_base = buffer, .iov_len = size };
     /* Sockets are kept in blocking mode in the negotiation phase.  After
@@ -109,16 +109,16 @@ static inline ssize_t read_sync_eof(QIOChannel *ioc, void *buffer, size_t size,
      * our request/reply.  Synchronization is done with recv_coroutine, so
      * that this is coroutine-safe.
      */
-    return nbd_wr_syncv(ioc, &iov, 1, size, true, errp);
+    return nbd_rwv(ioc, &iov, 1, size, true, errp);
 }
 
-/* read_sync
+/* nbd_read
  * Reads @size bytes from @ioc. Returns 0 on success.
  */
-static inline int read_sync(QIOChannel *ioc, void *buffer, size_t size,
-                            Error **errp)
+static inline int nbd_read(QIOChannel *ioc, void *buffer, size_t size,
+                           Error **errp)
 {
-    ssize_t ret = read_sync_eof(ioc, buffer, size, errp);
+    ssize_t ret = nbd_read_eof(ioc, buffer, size, errp);
 
     if (ret >= 0 && ret != size) {
         ret = -EINVAL;
@@ -128,15 +128,15 @@ static inline int read_sync(QIOChannel *ioc, void *buffer, size_t size,
     return ret < 0 ? ret : 0;
 }
 
-/* write_sync
+/* nbd_write
  * Writes @size bytes to @ioc. Returns 0 on success.
  */
-static inline int write_sync(QIOChannel *ioc, const void *buffer, size_t size,
-                             Error **errp)
+static inline int nbd_write(QIOChannel *ioc, const void *buffer, size_t size,
+                            Error **errp)
 {
     struct iovec iov = { .iov_base = (void *) buffer, .iov_len = size };
 
-    ssize_t ret = nbd_wr_syncv(ioc, &iov, 1, size, false, errp);
+    ssize_t ret = nbd_rwv(ioc, &iov, 1, size, false, errp);
 
     assert(ret < 0 || ret == size);
 
@@ -153,4 +153,6 @@ struct NBDTLSHandshakeData {
 void nbd_tls_handshake(QIOTask *task,
                        void *opaque);
 
+int nbd_drop(QIOChannel *ioc, size_t size, Error **errp);
+
 #endif
diff --git a/nbd/server.c b/nbd/server.c
index 49b55f6..8a70c05 100644
--- a/nbd/server.c
+++ b/nbd/server.c
@@ -81,7 +81,7 @@ static QTAILQ_HEAD(, NBDExport) exports = QTAILQ_HEAD_INITIALIZER(exports);
 
 struct NBDClient {
     int refcount;
-    void (*close)(NBDClient *client);
+    void (*close_fn)(NBDClient *client, bool negotiated);
 
     bool no_zeroes;
     NBDExport *exp;
@@ -104,69 +104,6 @@ struct NBDClient {
 
 static void nbd_client_receive_next_request(NBDClient *client);
 
-static gboolean nbd_negotiate_continue(QIOChannel *ioc,
-                                       GIOCondition condition,
-                                       void *opaque)
-{
-    qemu_coroutine_enter(opaque);
-    return TRUE;
-}
-
-static int nbd_negotiate_read(QIOChannel *ioc, void *buffer, size_t size)
-{
-    ssize_t ret;
-    guint watch;
-
-    assert(qemu_in_coroutine());
-    /* Negotiation are always in main loop. */
-    watch = qio_channel_add_watch(ioc,
-                                  G_IO_IN,
-                                  nbd_negotiate_continue,
-                                  qemu_coroutine_self(),
-                                  NULL);
-    ret = read_sync(ioc, buffer, size, NULL);
-    g_source_remove(watch);
-    return ret;
-
-}
-
-static int nbd_negotiate_write(QIOChannel *ioc, const void *buffer, size_t size)
-{
-    ssize_t ret;
-    guint watch;
-
-    assert(qemu_in_coroutine());
-    /* Negotiation are always in main loop. */
-    watch = qio_channel_add_watch(ioc,
-                                  G_IO_OUT,
-                                  nbd_negotiate_continue,
-                                  qemu_coroutine_self(),
-                                  NULL);
-    ret = write_sync(ioc, buffer, size, NULL);
-    g_source_remove(watch);
-    return ret;
-}
-
-static int nbd_negotiate_drop_sync(QIOChannel *ioc, size_t size)
-{
-    ssize_t ret;
-    uint8_t *buffer = g_malloc(MIN(65536, size));
-
-    while (size > 0) {
-        size_t count = MIN(65536, size);
-        ret = nbd_negotiate_read(ioc, buffer, count);
-        if (ret < 0) {
-            g_free(buffer);
-            return ret;
-        }
-
-        size -= count;
-    }
-
-    g_free(buffer);
-    return 0;
-}
-
 /* Basic flow for negotiation
 
    Server         Client
@@ -205,22 +142,22 @@ static int nbd_negotiate_send_rep_len(QIOChannel *ioc, uint32_t type,
           type, opt, len);
 
     magic = cpu_to_be64(NBD_REP_MAGIC);
-    if (nbd_negotiate_write(ioc, &magic, sizeof(magic)) < 0) {
+    if (nbd_write(ioc, &magic, sizeof(magic), NULL) < 0) {
         LOG("write failed (rep magic)");
         return -EINVAL;
     }
     opt = cpu_to_be32(opt);
-    if (nbd_negotiate_write(ioc, &opt, sizeof(opt)) < 0) {
+    if (nbd_write(ioc, &opt, sizeof(opt), NULL) < 0) {
         LOG("write failed (rep opt)");
         return -EINVAL;
     }
     type = cpu_to_be32(type);
-    if (nbd_negotiate_write(ioc, &type, sizeof(type)) < 0) {
+    if (nbd_write(ioc, &type, sizeof(type), NULL) < 0) {
         LOG("write failed (rep type)");
         return -EINVAL;
     }
     len = cpu_to_be32(len);
-    if (nbd_negotiate_write(ioc, &len, sizeof(len)) < 0) {
+    if (nbd_write(ioc, &len, sizeof(len), NULL) < 0) {
         LOG("write failed (rep data length)");
         return -EINVAL;
     }
@@ -255,7 +192,7 @@ nbd_negotiate_send_rep_err(QIOChannel *ioc, uint32_t type,
     if (ret < 0) {
         goto out;
     }
-    if (nbd_negotiate_write(ioc, msg, len) < 0) {
+    if (nbd_write(ioc, msg, len, NULL) < 0) {
         LOG("write failed (error message)");
         ret = -EIO;
     } else {
@@ -274,27 +211,27 @@ static int nbd_negotiate_send_rep_list(QIOChannel *ioc, NBDExport *exp)
     uint32_t len;
     const char *name = exp->name ? exp->name : "";
     const char *desc = exp->description ? exp->description : "";
-    int rc;
+    int ret;
 
     TRACE("Advertising export name '%s' description '%s'", name, desc);
     name_len = strlen(name);
     desc_len = strlen(desc);
     len = name_len + desc_len + sizeof(len);
-    rc = nbd_negotiate_send_rep_len(ioc, NBD_REP_SERVER, NBD_OPT_LIST, len);
-    if (rc < 0) {
-        return rc;
+    ret = nbd_negotiate_send_rep_len(ioc, NBD_REP_SERVER, NBD_OPT_LIST, len);
+    if (ret < 0) {
+        return ret;
     }
 
     len = cpu_to_be32(name_len);
-    if (nbd_negotiate_write(ioc, &len, sizeof(len)) < 0) {
+    if (nbd_write(ioc, &len, sizeof(len), NULL) < 0) {
         LOG("write failed (name length)");
         return -EINVAL;
     }
-    if (nbd_negotiate_write(ioc, name, name_len) < 0) {
+    if (nbd_write(ioc, name, name_len, NULL) < 0) {
         LOG("write failed (name buffer)");
         return -EINVAL;
     }
-    if (nbd_negotiate_write(ioc, desc, desc_len) < 0) {
+    if (nbd_write(ioc, desc, desc_len, NULL) < 0) {
         LOG("write failed (description buffer)");
         return -EINVAL;
     }
@@ -308,7 +245,7 @@ static int nbd_negotiate_handle_list(NBDClient *client, uint32_t length)
     NBDExport *exp;
 
     if (length) {
-        if (nbd_negotiate_drop_sync(client->ioc, length) < 0) {
+        if (nbd_drop(client->ioc, length, NULL) < 0) {
             return -EIO;
         }
         return nbd_negotiate_send_rep_err(client->ioc,
@@ -328,7 +265,6 @@ static int nbd_negotiate_handle_list(NBDClient *client, uint32_t length)
 
 static int nbd_negotiate_handle_export_name(NBDClient *client, uint32_t length)
 {
-    int rc = -EINVAL;
     char name[NBD_MAX_NAME_SIZE + 1];
 
     /* Client sends:
@@ -337,11 +273,11 @@ static int nbd_negotiate_handle_export_name(NBDClient *client, uint32_t length)
     TRACE("Checking length");
     if (length >= sizeof(name)) {
         LOG("Bad length received");
-        goto fail;
+        return -EINVAL;
     }
-    if (nbd_negotiate_read(client->ioc, name, length) < 0) {
+    if (nbd_read(client->ioc, name, length, NULL) < 0) {
         LOG("read failed");
-        goto fail;
+        return -EINVAL;
     }
     name[length] = '\0';
 
@@ -350,14 +286,13 @@ static int nbd_negotiate_handle_export_name(NBDClient *client, uint32_t length)
     client->exp = nbd_export_find(name);
     if (!client->exp) {
         LOG("export not found");
-        goto fail;
+        return -EINVAL;
     }
 
     QTAILQ_INSERT_TAIL(&client->exp->clients, client, next);
     nbd_export_get(client->exp);
-    rc = 0;
-fail:
-    return rc;
+
+    return 0;
 }
 
 /* Handle NBD_OPT_STARTTLS. Return NULL to drop connection, or else the
@@ -372,7 +307,7 @@ static QIOChannel *nbd_negotiate_handle_starttls(NBDClient *client,
     TRACE("Setting up TLS");
     ioc = client->ioc;
     if (length) {
-        if (nbd_negotiate_drop_sync(ioc, length) < 0) {
+        if (nbd_drop(ioc, length, NULL) < 0) {
             return NULL;
         }
         nbd_negotiate_send_rep_err(ioc, NBD_REP_ERR_INVALID, NBD_OPT_STARTTLS,
@@ -436,7 +371,7 @@ static int nbd_negotiate_options(NBDClient *client)
         ...           Rest of request
     */
 
-    if (nbd_negotiate_read(client->ioc, &flags, sizeof(flags)) < 0) {
+    if (nbd_read(client->ioc, &flags, sizeof(flags), NULL) < 0) {
         LOG("read failed");
         return -EIO;
     }
@@ -462,7 +397,7 @@ static int nbd_negotiate_options(NBDClient *client)
         uint32_t clientflags, length;
         uint64_t magic;
 
-        if (nbd_negotiate_read(client->ioc, &magic, sizeof(magic)) < 0) {
+        if (nbd_read(client->ioc, &magic, sizeof(magic), NULL) < 0) {
             LOG("read failed");
             return -EINVAL;
         }
@@ -472,15 +407,15 @@ static int nbd_negotiate_options(NBDClient *client)
             return -EINVAL;
         }
 
-        if (nbd_negotiate_read(client->ioc, &clientflags,
-                               sizeof(clientflags)) < 0)
+        if (nbd_read(client->ioc, &clientflags,
+                      sizeof(clientflags), NULL) < 0)
         {
             LOG("read failed");
             return -EINVAL;
         }
         clientflags = be32_to_cpu(clientflags);
 
-        if (nbd_negotiate_read(client->ioc, &length, sizeof(length)) < 0) {
+        if (nbd_read(client->ioc, &length, sizeof(length), NULL) < 0) {
             LOG("read failed");
             return -EINVAL;
         }
@@ -510,7 +445,7 @@ static int nbd_negotiate_options(NBDClient *client)
                 return -EINVAL;
 
             default:
-                if (nbd_negotiate_drop_sync(client->ioc, length) < 0) {
+                if (nbd_drop(client->ioc, length, NULL) < 0) {
                     return -EIO;
                 }
                 ret = nbd_negotiate_send_rep_err(client->ioc,
@@ -548,7 +483,7 @@ static int nbd_negotiate_options(NBDClient *client)
                 return nbd_negotiate_handle_export_name(client, length);
 
             case NBD_OPT_STARTTLS:
-                if (nbd_negotiate_drop_sync(client->ioc, length) < 0) {
+                if (nbd_drop(client->ioc, length, NULL) < 0) {
                     return -EIO;
                 }
                 if (client->tlscreds) {
@@ -567,7 +502,7 @@ static int nbd_negotiate_options(NBDClient *client)
                 }
                 break;
             default:
-                if (nbd_negotiate_drop_sync(client->ioc, length) < 0) {
+                if (nbd_drop(client->ioc, length, NULL) < 0) {
                     return -EIO;
                 }
                 ret = nbd_negotiate_send_rep_err(client->ioc,
@@ -598,16 +533,10 @@ static int nbd_negotiate_options(NBDClient *client)
     }
 }
 
-typedef struct {
-    NBDClient *client;
-    Coroutine *co;
-} NBDClientNewData;
-
-static coroutine_fn int nbd_negotiate(NBDClientNewData *data)
+static coroutine_fn int nbd_negotiate(NBDClient *client)
 {
-    NBDClient *client = data->client;
     char buf[8 + 8 + 8 + 128];
-    int rc;
+    int ret;
     const uint16_t myflags = (NBD_FLAG_HAS_FLAGS | NBD_FLAG_SEND_TRIM |
                               NBD_FLAG_SEND_FLUSH | NBD_FLAG_SEND_FUA |
                               NBD_FLAG_SEND_WRITE_ZEROES);
@@ -633,7 +562,6 @@ static coroutine_fn int nbd_negotiate(NBDClientNewData *data)
      */
 
     qio_channel_set_blocking(client->ioc, false, NULL);
-    rc = -EINVAL;
 
     TRACE("Beginning negotiation.");
     memset(buf, 0, sizeof(buf));
@@ -654,21 +582,21 @@ static coroutine_fn int nbd_negotiate(NBDClientNewData *data)
     if (oldStyle) {
         if (client->tlscreds) {
             TRACE("TLS cannot be enabled with oldstyle protocol");
-            goto fail;
+            return -EINVAL;
         }
-        if (nbd_negotiate_write(client->ioc, buf, sizeof(buf)) < 0) {
+        if (nbd_write(client->ioc, buf, sizeof(buf), NULL) < 0) {
             LOG("write failed");
-            goto fail;
+            return -EINVAL;
         }
     } else {
-        if (nbd_negotiate_write(client->ioc, buf, 18) < 0) {
+        if (nbd_write(client->ioc, buf, 18, NULL) < 0) {
             LOG("write failed");
-            goto fail;
+            return -EINVAL;
         }
-        rc = nbd_negotiate_options(client);
-        if (rc != 0) {
+        ret = nbd_negotiate_options(client);
+        if (ret != 0) {
             LOG("option negotiation failed");
-            goto fail;
+            return ret;
         }
 
         TRACE("advertising size %" PRIu64 " and flags %x",
@@ -676,25 +604,25 @@ static coroutine_fn int nbd_negotiate(NBDClientNewData *data)
         stq_be_p(buf + 18, client->exp->size);
         stw_be_p(buf + 26, client->exp->nbdflags | myflags);
         len = client->no_zeroes ? 10 : sizeof(buf) - 18;
-        if (nbd_negotiate_write(client->ioc, buf + 18, len) < 0) {
+        ret = nbd_write(client->ioc, buf + 18, len, NULL);
+        if (ret < 0) {
             LOG("write failed");
-            goto fail;
+            return ret;
         }
     }
 
     TRACE("Negotiation succeeded.");
-    rc = 0;
-fail:
-    return rc;
+
+    return 0;
 }
 
-static ssize_t nbd_receive_request(QIOChannel *ioc, NBDRequest *request)
+static int nbd_receive_request(QIOChannel *ioc, NBDRequest *request)
 {
     uint8_t buf[NBD_REQUEST_SIZE];
     uint32_t magic;
-    ssize_t ret;
+    int ret;
 
-    ret = read_sync(ioc, buf, sizeof(buf), NULL);
+    ret = nbd_read(ioc, buf, sizeof(buf), NULL);
     if (ret < 0) {
         return ret;
     }
@@ -726,7 +654,7 @@ static ssize_t nbd_receive_request(QIOChannel *ioc, NBDRequest *request)
     return 0;
 }
 
-static ssize_t nbd_send_reply(QIOChannel *ioc, NBDReply *reply)
+static int nbd_send_reply(QIOChannel *ioc, NBDReply *reply)
 {
     uint8_t buf[NBD_REPLY_SIZE];
 
@@ -745,7 +673,7 @@ static ssize_t nbd_send_reply(QIOChannel *ioc, NBDReply *reply)
     stl_be_p(buf + 4, reply->error);
     stq_be_p(buf + 8, reply->handle);
 
-    return write_sync(ioc, buf, sizeof(buf), NULL);
+    return nbd_write(ioc, buf, sizeof(buf), NULL);
 }
 
 #define MAX_NBD_REQUESTS 16
@@ -778,7 +706,7 @@ void nbd_client_put(NBDClient *client)
     }
 }
 
-static void client_close(NBDClient *client)
+static void client_close(NBDClient *client, bool negotiated)
 {
     if (client->closing) {
         return;
@@ -793,8 +721,8 @@ static void client_close(NBDClient *client)
                          NULL);
 
     /* Also tell the client, so that they release their reference.  */
-    if (client->close) {
-        client->close(client);
+    if (client->close_fn) {
+        client->close_fn(client, negotiated);
     }
 }
 
@@ -975,7 +903,7 @@ void nbd_export_close(NBDExport *exp)
 
     nbd_export_get(exp);
     QTAILQ_FOREACH_SAFE(client, &exp->clients, next, next) {
-        client_close(client);
+        client_close(client, true);
     }
     nbd_export_set_name(exp, NULL);
     nbd_export_set_description(exp, NULL);
@@ -1032,25 +960,24 @@ void nbd_export_close_all(void)
     }
 }
 
-static ssize_t nbd_co_send_reply(NBDRequestData *req, NBDReply *reply,
-                                 int len)
+static int nbd_co_send_reply(NBDRequestData *req, NBDReply *reply, int len)
 {
     NBDClient *client = req->client;
-    ssize_t rc, ret;
+    int ret;
 
     g_assert(qemu_in_coroutine());
     qemu_co_mutex_lock(&client->send_lock);
     client->send_coroutine = qemu_coroutine_self();
 
     if (!len) {
-        rc = nbd_send_reply(client->ioc, reply);
+        ret = nbd_send_reply(client->ioc, reply);
     } else {
         qio_channel_set_cork(client->ioc, true);
-        rc = nbd_send_reply(client->ioc, reply);
-        if (rc >= 0) {
-            ret = write_sync(client->ioc, req->data, len, NULL);
+        ret = nbd_send_reply(client->ioc, reply);
+        if (ret == 0) {
+            ret = nbd_write(client->ioc, req->data, len, NULL);
             if (ret < 0) {
-                rc = -EIO;
+                ret = -EIO;
             }
         }
         qio_channel_set_cork(client->ioc, false);
@@ -1058,28 +985,23 @@ static ssize_t nbd_co_send_reply(NBDRequestData *req, NBDReply *reply,
 
     client->send_coroutine = NULL;
     qemu_co_mutex_unlock(&client->send_lock);
-    return rc;
+    return ret;
 }
 
-/* Collect a client request.  Return 0 if request looks valid, -EAGAIN
- * to keep trying the collection, -EIO to drop connection right away,
- * and any other negative value to report an error to the client
- * (although the caller may still need to disconnect after reporting
- * the error).  */
-static ssize_t nbd_co_receive_request(NBDRequestData *req,
-                                      NBDRequest *request)
+/* nbd_co_receive_request
+ * Collect a client request. Return 0 if request looks valid, -EIO to drop
+ * connection right away, and any other negative value to report an error to
+ * the client (although the caller may still need to disconnect after reporting
+ * the error).
+ */
+static int nbd_co_receive_request(NBDRequestData *req, NBDRequest *request)
 {
     NBDClient *client = req->client;
-    ssize_t rc;
 
     g_assert(qemu_in_coroutine());
     assert(client->recv_coroutine == qemu_coroutine_self());
-    rc = nbd_receive_request(client->ioc, request);
-    if (rc < 0) {
-        if (rc != -EAGAIN) {
-            rc = -EIO;
-        }
-        goto out;
+    if (nbd_receive_request(client->ioc, request) < 0) {
+        return -EIO;
     }
 
     TRACE("Decoding type");
@@ -1093,8 +1015,7 @@ static ssize_t nbd_co_receive_request(NBDRequestData *req,
         /* Special case: we're going to disconnect without a reply,
          * whether or not flags, from, or len are bogus */
         TRACE("Request type is DISCONNECT");
-        rc = -EIO;
-        goto out;
+        return -EIO;
     }
 
     /* Check for sanity in the parameters, part 1.  Defer as many
@@ -1102,31 +1023,27 @@ static ssize_t nbd_co_receive_request(NBDRequestData *req,
      * payload, so we can try and keep the connection alive.  */
     if ((request->from + request->len) < request->from) {
         LOG("integer overflow detected, you're probably being attacked");
-        rc = -EINVAL;
-        goto out;
+        return -EINVAL;
     }
 
     if (request->type == NBD_CMD_READ || request->type == NBD_CMD_WRITE) {
         if (request->len > NBD_MAX_BUFFER_SIZE) {
             LOG("len (%" PRIu32" ) is larger than max len (%u)",
                 request->len, NBD_MAX_BUFFER_SIZE);
-            rc = -EINVAL;
-            goto out;
+            return -EINVAL;
         }
 
         req->data = blk_try_blockalign(client->exp->blk, request->len);
         if (req->data == NULL) {
-            rc = -ENOMEM;
-            goto out;
+            return -ENOMEM;
         }
     }
     if (request->type == NBD_CMD_WRITE) {
         TRACE("Reading %" PRIu32 " byte(s)", request->len);
 
-        if (read_sync(client->ioc, req->data, request->len, NULL) < 0) {
+        if (nbd_read(client->ioc, req->data, request->len, NULL) < 0) {
             LOG("reading from socket failed");
-            rc = -EIO;
-            goto out;
+            return -EIO;
         }
         req->complete = true;
     }
@@ -1136,28 +1053,19 @@ static ssize_t nbd_co_receive_request(NBDRequestData *req,
         LOG("operation past EOF; From: %" PRIu64 ", Len: %" PRIu32
             ", Size: %" PRIu64, request->from, request->len,
             (uint64_t)client->exp->size);
-        rc = request->type == NBD_CMD_WRITE ? -ENOSPC : -EINVAL;
-        goto out;
+        return request->type == NBD_CMD_WRITE ? -ENOSPC : -EINVAL;
     }
     if (request->flags & ~(NBD_CMD_FLAG_FUA | NBD_CMD_FLAG_NO_HOLE)) {
         LOG("unsupported flags (got 0x%x)", request->flags);
-        rc = -EINVAL;
-        goto out;
+        return -EINVAL;
     }
     if (request->type != NBD_CMD_WRITE_ZEROES &&
         (request->flags & NBD_CMD_FLAG_NO_HOLE)) {
         LOG("unexpected flags (got 0x%x)", request->flags);
-        rc = -EINVAL;
-        goto out;
+        return -EINVAL;
     }
 
-    rc = 0;
-
-out:
-    client->recv_coroutine = NULL;
-    nbd_client_receive_next_request(client);
-
-    return rc;
+    return 0;
 }
 
 /* Owns a reference to the NBDClient passed as opaque.  */
@@ -1168,8 +1076,9 @@ static coroutine_fn void nbd_trip(void *opaque)
     NBDRequestData *req;
     NBDRequest request = { 0 };    /* GCC thinks it can be used uninitialized */
     NBDReply reply;
-    ssize_t ret;
+    int ret;
     int flags;
+    int reply_data_len = 0;
 
     TRACE("Reading request.");
     if (client->closing) {
@@ -1179,11 +1088,10 @@ static coroutine_fn void nbd_trip(void *opaque)
 
     req = nbd_request_get(client);
     ret = nbd_co_receive_request(req, &request);
-    if (ret == -EAGAIN) {
-        goto done;
-    }
+    client->recv_coroutine = NULL;
+    nbd_client_receive_next_request(client);
     if (ret == -EIO) {
-        goto out;
+        goto disconnect;
     }
 
     reply.handle = request.handle;
@@ -1191,7 +1099,7 @@ static coroutine_fn void nbd_trip(void *opaque)
 
     if (ret < 0) {
         reply.error = -ret;
-        goto error_reply;
+        goto reply;
     }
 
     if (client->closing) {
@@ -1212,7 +1120,7 @@ static coroutine_fn void nbd_trip(void *opaque)
             if (ret < 0) {
                 LOG("flush failed");
                 reply.error = -ret;
-                goto error_reply;
+                break;
             }
         }
 
@@ -1221,12 +1129,12 @@ static coroutine_fn void nbd_trip(void *opaque)
         if (ret < 0) {
             LOG("reading from file failed");
             reply.error = -ret;
-            goto error_reply;
+            break;
         }
 
+        reply_data_len = request.len;
         TRACE("Read %" PRIu32" byte(s)", request.len);
-        if (nbd_co_send_reply(req, &reply, request.len) < 0)
-            goto out;
+
         break;
     case NBD_CMD_WRITE:
         TRACE("Request type is WRITE");
@@ -1234,7 +1142,7 @@ static coroutine_fn void nbd_trip(void *opaque)
         if (exp->nbdflags & NBD_FLAG_READ_ONLY) {
             TRACE("Server is read-only, return error");
             reply.error = EROFS;
-            goto error_reply;
+            break;
         }
 
         TRACE("Writing to device");
@@ -1248,21 +1156,16 @@ static coroutine_fn void nbd_trip(void *opaque)
         if (ret < 0) {
             LOG("writing to file failed");
             reply.error = -ret;
-            goto error_reply;
         }
 
-        if (nbd_co_send_reply(req, &reply, 0) < 0) {
-            goto out;
-        }
         break;
-
     case NBD_CMD_WRITE_ZEROES:
         TRACE("Request type is WRITE_ZEROES");
 
         if (exp->nbdflags & NBD_FLAG_READ_ONLY) {
             TRACE("Server is read-only, return error");
             reply.error = EROFS;
-            goto error_reply;
+            break;
         }
 
         TRACE("Writing to device");
@@ -1279,14 +1182,9 @@ static coroutine_fn void nbd_trip(void *opaque)
         if (ret < 0) {
             LOG("writing to file failed");
             reply.error = -ret;
-            goto error_reply;
         }
 
-        if (nbd_co_send_reply(req, &reply, 0) < 0) {
-            goto out;
-        }
         break;
-
     case NBD_CMD_DISC:
         /* unreachable, thanks to special case in nbd_co_receive_request() */
         abort();
@@ -1299,9 +1197,7 @@ static coroutine_fn void nbd_trip(void *opaque)
             LOG("flush failed");
             reply.error = -ret;
         }
-        if (nbd_co_send_reply(req, &reply, 0) < 0) {
-            goto out;
-        }
+
         break;
     case NBD_CMD_TRIM:
         TRACE("Request type is TRIM");
@@ -1311,21 +1207,19 @@ static coroutine_fn void nbd_trip(void *opaque)
             LOG("discard failed");
             reply.error = -ret;
         }
-        if (nbd_co_send_reply(req, &reply, 0) < 0) {
-            goto out;
-        }
+
         break;
     default:
         LOG("invalid request type (%" PRIu32 ") received", request.type);
         reply.error = EINVAL;
-    error_reply:
-        /* We must disconnect after NBD_CMD_WRITE if we did not
-         * read the payload.
-         */
-        if (nbd_co_send_reply(req, &reply, 0) < 0 || !req->complete) {
-            goto out;
-        }
-        break;
+    }
+
+reply:
+    /* We must disconnect after NBD_CMD_WRITE if we did not
+     * read the payload.
+     */
+    if (nbd_co_send_reply(req, &reply, reply_data_len) < 0 || !req->complete) {
+        goto disconnect;
     }
 
     TRACE("Request/Reply complete");
@@ -1335,9 +1229,9 @@ done:
     nbd_client_put(client);
     return;
 
-out:
+disconnect:
     nbd_request_put(req);
-    client_close(client);
+    client_close(client, true);
     nbd_client_put(client);
 }
 
@@ -1352,8 +1246,7 @@ static void nbd_client_receive_next_request(NBDClient *client)
 
 static coroutine_fn void nbd_co_client_start(void *opaque)
 {
-    NBDClientNewData *data = opaque;
-    NBDClient *client = data->client;
+    NBDClient *client = opaque;
     NBDExport *exp = client->exp;
 
     if (exp) {
@@ -1362,25 +1255,28 @@ static coroutine_fn void nbd_co_client_start(void *opaque)
     }
     qemu_co_mutex_init(&client->send_lock);
 
-    if (nbd_negotiate(data)) {
-        client_close(client);
-        goto out;
+    if (nbd_negotiate(client)) {
+        client_close(client, false);
+        return;
     }
 
     nbd_client_receive_next_request(client);
-
-out:
-    g_free(data);
 }
 
+/*
+ * Create a new client listener on the given export @exp, using the
+ * given channel @sioc.  Begin servicing it in a coroutine.  When the
+ * connection closes, call @close_fn with an indication of whether the
+ * client completed negotiation.
+ */
 void nbd_client_new(NBDExport *exp,
                     QIOChannelSocket *sioc,
                     QCryptoTLSCreds *tlscreds,
                     const char *tlsaclname,
-                    void (*close_fn)(NBDClient *))
+                    void (*close_fn)(NBDClient *, bool))
 {
     NBDClient *client;
-    NBDClientNewData *data = g_new(NBDClientNewData, 1);
+    Coroutine *co;
 
     client = g_malloc0(sizeof(NBDClient));
     client->refcount = 1;
@@ -1394,9 +1290,8 @@ void nbd_client_new(NBDExport *exp,
     object_ref(OBJECT(client->sioc));
     client->ioc = QIO_CHANNEL(sioc);
     object_ref(OBJECT(client->ioc));
-    client->close = close_fn;
+    client->close_fn = close_fn;
 
-    data->client = client;
-    data->co = qemu_coroutine_create(nbd_co_client_start, data);
-    qemu_coroutine_enter(data->co);
+    co = qemu_coroutine_create(nbd_co_client_start, client);
+    qemu_coroutine_enter(co);
 }
diff --git a/qemu-doc.texi b/qemu-doc.texi
index 965ba59..21079fd 100644
--- a/qemu-doc.texi
+++ b/qemu-doc.texi
@@ -1,11 +1,12 @@
 \input texinfo @c -*- texinfo -*-
 @c %**start of header
 @setfilename qemu-doc.info
+@include version.texi
 
 @documentlanguage en
 @documentencoding UTF-8
 
-@settitle QEMU Emulator User Documentation
+@settitle QEMU version @value{VERSION} User Documentation
 @exampleindent 0
 @paragraphindent 0
 @c %**end of header
@@ -19,7 +20,7 @@
 @iftex
 @titlepage
 @sp 7
-@center @titlefont{QEMU Emulator}
+@center @titlefont{QEMU version @value{VERSION}}
 @sp 1
 @center @titlefont{User Documentation}
 @sp 3
diff --git a/qemu-nbd.c b/qemu-nbd.c
index 651f85e..4dd3fd4 100644
--- a/qemu-nbd.c
+++ b/qemu-nbd.c
@@ -336,10 +336,10 @@ static void nbd_export_closed(NBDExport *exp)
 
 static void nbd_update_server_watch(void);
 
-static void nbd_client_closed(NBDClient *client)
+static void nbd_client_closed(NBDClient *client, bool negotiated)
 {
     nb_fds--;
-    if (nb_fds == 0 && !persistent && state == RUNNING) {
+    if (negotiated && nb_fds == 0 && !persistent && state == RUNNING) {
         state = TERMINATE;
     }
     nbd_update_server_watch();
@@ -581,6 +581,10 @@ int main(int argc, char **argv)
     sa_sigterm.sa_handler = termsig_handler;
     sigaction(SIGTERM, &sa_sigterm, NULL);
 
+#ifdef CONFIG_POSIX
+    signal(SIGPIPE, SIG_IGN);
+#endif
+
     module_call_init(MODULE_INIT_TRACE);
     qcrypto_init(&error_fatal);
 
diff --git a/rules.mak b/rules.mak
index 2a2fb72..6e94333 100644
--- a/rules.mak
+++ b/rules.mak
@@ -377,7 +377,7 @@ define unnest-vars
 endef
 
 TEXI2MAN = $(call quiet-command, \
-	perl -Ww -- $(SRC_PATH)/scripts/texi2pod.pl -I docs $< $@.pod && \
+	perl -Ww -- $(SRC_PATH)/scripts/texi2pod.pl $(TEXI2PODFLAGS) $< $@.pod && \
 	$(POD2MAN) --section=$(subst .,,$(suffix $@)) --center=" " --release=" " $@.pod > $@, \
 	"GEN","$@")
 
diff --git a/target/i386/hax-all.c b/target/i386/hax-all.c
index 097db5c..ba6117d 100644
--- a/target/i386/hax-all.c
+++ b/target/i386/hax-all.c
@@ -514,9 +514,10 @@ static int hax_vcpu_hax_exec(CPUArchState *env)
         hax_vcpu_interrupt(env);
 
         qemu_mutex_unlock_iothread();
+        cpu_exec_start(cpu);
         hax_ret = hax_vcpu_run(vcpu);
+        cpu_exec_end(cpu);
         qemu_mutex_lock_iothread();
-        current_cpu = cpu;
 
         /* Simply continue the vcpu_run if system call interrupted */
         if (hax_ret == -EINTR || hax_ret == -EAGAIN) {
diff --git a/tcg-runtime.c b/tcg/tcg-runtime.c
index 7fa90ce..7fa90ce 100644
--- a/tcg-runtime.c
+++ b/tcg/tcg-runtime.c
diff --git a/tci.c b/tcg/tci.c
index 4bdc645..4bdc645 100644
--- a/tci.c
+++ b/tcg/tci.c
diff --git a/tests/Makefile.include b/tests/Makefile.include
index f42f3df..77da9b7 100644
--- a/tests/Makefile.include
+++ b/tests/Makefile.include
@@ -205,6 +205,8 @@ check-qtest-pci-y += tests/intel-hda-test$(EXESUF)
 gcov-files-pci-y += hw/audio/intel-hda.c hw/audio/hda-codec.c
 check-qtest-pci-$(CONFIG_EVENTFD) += tests/ivshmem-test$(EXESUF)
 gcov-files-pci-y += hw/misc/ivshmem.c
+check-qtest-pci-y += tests/megasas-test$(EXESUF)
+gcov-files-pci-y += hw/scsi/megasas.c
 
 check-qtest-i386-y = tests/endianness-test$(EXESUF)
 check-qtest-i386-y += tests/fdc-test$(EXESUF)
@@ -755,6 +757,7 @@ tests/test-filter-mirror$(EXESUF): tests/test-filter-mirror.o $(qtest-obj-y)
 tests/test-filter-redirector$(EXESUF): tests/test-filter-redirector.o $(qtest-obj-y)
 tests/test-x86-cpuid-compat$(EXESUF): tests/test-x86-cpuid-compat.o $(qtest-obj-y)
 tests/ivshmem-test$(EXESUF): tests/ivshmem-test.o contrib/ivshmem-server/ivshmem-server.o $(libqos-pc-obj-y) $(libqos-spapr-obj-y)
+tests/megasas-test$(EXESUF): tests/megasas-test.o $(libqos-spapr-obj-y) $(libqos-pc-obj-y)
 tests/vhost-user-bridge$(EXESUF): tests/vhost-user-bridge.o contrib/libvhost-user/libvhost-user.o $(test-util-obj-y)
 tests/test-uuid$(EXESUF): tests/test-uuid.o $(test-util-obj-y)
 tests/test-arm-mptimer$(EXESUF): tests/test-arm-mptimer.o
diff --git a/tests/megasas-test.c b/tests/megasas-test.c
new file mode 100644
index 0000000..ce960e7
--- /dev/null
+++ b/tests/megasas-test.c
@@ -0,0 +1,86 @@
+/*
+ * QTest testcase for LSI MegaRAID
+ *
+ * Copyright (c) 2017 Red Hat Inc.
+ *
+ * This work is licensed under the terms of the GNU GPL, version 2 or later.
+ * See the COPYING file in the top-level directory.
+ */
+
+#include "qemu/osdep.h"
+#include "libqtest.h"
+#include "qemu/bswap.h"
+#include "libqos/libqos-pc.h"
+#include "libqos/libqos-spapr.h"
+
+static QOSState *qmegasas_start(const char *extra_opts)
+{
+    const char *arch = qtest_get_arch();
+    const char *cmd = "-drive id=hd0,if=none,file=null-co://,format=raw "
+                      "-device megasas,id=scsi0,addr=04.0 "
+                      "-device scsi-hd,bus=scsi0.0,drive=hd0 %s";
+
+    if (strcmp(arch, "i386") == 0 || strcmp(arch, "x86_64") == 0) {
+        return qtest_pc_boot(cmd, extra_opts ? : "");
+    }
+
+    g_printerr("virtio-scsi tests are only available on x86 or ppc64\n");
+    exit(EXIT_FAILURE);
+}
+
+static void qmegasas_stop(QOSState *qs)
+{
+    qtest_shutdown(qs);
+}
+
+/* Tests only initialization so far. TODO: Replace with functional tests */
+static void pci_nop(void)
+{
+    QOSState *qs;
+
+    qs = qmegasas_start(NULL);
+    qmegasas_stop(qs);
+}
+
+/* This used to cause a NULL pointer dereference.  */
+static void megasas_pd_get_info_fuzz(void)
+{
+    QPCIDevice *dev;
+    QOSState *qs;
+    QPCIBar bar;
+    uint32_t context[256];
+    uint64_t context_pa;
+    int i;
+
+    qs = qmegasas_start(NULL);
+    dev = qpci_device_find(qs->pcibus, QPCI_DEVFN(4,0));
+    g_assert(dev != NULL);
+
+    qpci_device_enable(dev);
+    bar = qpci_iomap(dev, 0, NULL);
+
+    memset(context, 0, sizeof(context));
+    context[0] = cpu_to_le32(0x05050505);
+    context[1] = cpu_to_le32(0x01010101);
+    for (i = 2; i < ARRAY_SIZE(context); i++) {
+        context[i] = cpu_to_le32(0x41414141);
+    }
+    context[6] = cpu_to_le32(0x02020000);
+    context[7] = cpu_to_le32(0);
+
+    context_pa = qmalloc(qs, sizeof(context));
+    memwrite(context_pa, context, sizeof(context));
+    qpci_io_writel(dev, bar, 0x40, context_pa);
+
+    g_free(dev);
+    qmegasas_stop(qs);
+}
+
+int main(int argc, char **argv)
+{
+    g_test_init(&argc, &argv, NULL);
+    qtest_add_func("/megasas/pci/nop", pci_nop);
+    qtest_add_func("/megasas/dcmd/pd-get-info/fuzz", megasas_pd_get_info_fuzz);
+
+    return g_test_run();
+}
diff --git a/trace-events b/trace-events
index fd83087..bae63fd 100644
--- a/trace-events
+++ b/trace-events
@@ -55,28 +55,6 @@ dma_complete(void *dbs, int ret, void *cb) "dbs=%p ret=%d cb=%p"
 dma_blk_cb(void *dbs, int ret) "dbs=%p ret=%d"
 dma_map_wait(void *dbs) "dbs=%p"
 
-# kvm-all.c
-kvm_ioctl(int type, void *arg) "type 0x%x, arg %p"
-kvm_vm_ioctl(int type, void *arg) "type 0x%x, arg %p"
-kvm_vcpu_ioctl(int cpu_index, int type, void *arg) "cpu_index %d, type 0x%x, arg %p"
-kvm_run_exit(int cpu_index, uint32_t reason) "cpu_index %d, reason %d"
-kvm_device_ioctl(int fd, int type, void *arg) "dev fd %d, type 0x%x, arg %p"
-kvm_failed_reg_get(uint64_t id, const char *msg) "Warning: Unable to retrieve ONEREG %" PRIu64 " from KVM: %s"
-kvm_failed_reg_set(uint64_t id, const char *msg) "Warning: Unable to set ONEREG %" PRIu64 " to KVM: %s"
-kvm_irqchip_commit_routes(void) ""
-kvm_irqchip_add_msi_route(char *name, int vector, int virq) "dev %s vector %d virq %d"
-kvm_irqchip_update_msi_route(int virq) "Updating MSI route virq=%d"
-kvm_irqchip_release_virq(int virq) "virq %d"
-
-# TCG related tracing (mostly disabled by default)
-# cpu-exec.c
-disable exec_tb(void *tb, uintptr_t pc) "tb:%p pc=0x%"PRIxPTR
-disable exec_tb_nocache(void *tb, uintptr_t pc) "tb:%p pc=0x%"PRIxPTR
-disable exec_tb_exit(void *last_tb, unsigned int flags) "tb:%p flags=%x"
-
-# translate-all.c
-translate_block(void *tb, uintptr_t pc, uint8_t *tb_code) "tb:%p, pc:0x%"PRIxPTR", tb_code:%p"
-
 # memory.c
 memory_region_ops_read(int cpu_index, void *mr, uint64_t addr, uint64_t value, unsigned size) "cpu %d mr %p addr %#"PRIx64" value %#"PRIx64" size %u"
 memory_region_ops_write(int cpu_index, void *mr, uint64_t addr, uint64_t value, unsigned size) "cpu %d mr %p addr %#"PRIx64" value %#"PRIx64" size %u"
diff --git a/vl.c b/vl.c
index 32db19e..59fea15 100644
--- a/vl.c
+++ b/vl.c
@@ -3757,21 +3757,18 @@ int main(int argc, char **argv, char **envp)
                 qdev_prop_register_global(&kvm_pit_lost_tick_policy);
                 break;
             }
-            case QEMU_OPTION_accel: {
-                QemuOpts *accel_opts;
-
+            case QEMU_OPTION_accel:
                 accel_opts = qemu_opts_parse_noisily(qemu_find_opts("accel"),
                                                      optarg, true);
                 optarg = qemu_opt_get(accel_opts, "accel");
                 if (!optarg || is_help_option(optarg)) {
                     error_printf("Possible accelerators: kvm, xen, hax, tcg\n");
-                    exit(1);
+                    exit(0);
                 }
-                accel_opts = qemu_opts_create(qemu_find_opts("machine"), NULL,
-                                              false, &error_abort);
-                qemu_opt_set(accel_opts, "accel", optarg, &error_abort);
+                opts = qemu_opts_create(qemu_find_opts("machine"), NULL,
+                                        false, &error_abort);
+                qemu_opt_set(opts, "accel", optarg, &error_abort);
                 break;
-            }
             case QEMU_OPTION_usb:
                 olist = qemu_find_opts("machine");
                 qemu_opts_parse_noisily(olist, "usb=on", false);