Merge tag 'xenfv-2' of git://git.infradead.org/users/dwmw2/qemu into staging

Enable PV backends with Xen/KVM emulation

This is phase 2, following on from the basic platform support which was
already merged.

 • Add a simple single-tenant internal XenStore implementation
 • Indirect Xen gnttab/evtchn/foreignmem/xenstore through operations table
 • Provide emulated back ends for Xen operations
 • Header cleanups to allow PV back ends to build without Xen itself
 • Enable PV back ends in emulated mode
 • Documentation update

Tested-by: Paul Durrant <paul@xen.org>
... on real Xen (master branch, 4.18) with a Debian guest.

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# gpg:          There is no indication that the signature belongs to the owner.
# Primary key fingerprint: 314B 08AC D0DE 4811 33A5  F286 9BE9 80FD 0AC0 1544

* tag 'xenfv-2' of git://git.infradead.org/users/dwmw2/qemu: (27 commits)
  docs: Update Xen-on-KVM documentation for PV disk support
  MAINTAINERS: Add entry for Xen on KVM emulation
  i386/xen: Initialize Xen backends from pc_basic_device_init() for emulation
  hw/xen: Implement soft reset for emulated gnttab
  hw/xen: Map guest XENSTORE_PFN grant in emulated Xenstore
  hw/xen: Add emulated implementation of XenStore operations
  hw/xen: Add emulated implementation of grant table operations
  hw/xen: Hook up emulated implementation for event channel operations
  hw/xen: Only advertise ring-page-order for xen-block if gnttab supports it
  hw/xen: Avoid crash when backend watch fires too early
  hw/xen: Build PV backend drivers for CONFIG_XEN_BUS
  hw/xen: Rename xen_common.h to xen_native.h
  hw/xen: Use XEN_PAGE_SIZE in PV backend drivers
  hw/xen: Move xenstore_store_pv_console_info to xen_console.c
  hw/xen: Add xenstore operations to allow redirection to internal emulation
  hw/xen: Add foreignmem operations to allow redirection to internal emulation
  hw/xen: Pass grant ref to gnttab unmap operation
  hw/xen: Add gnttab operations to allow redirection to internal emulation
  hw/xen: Add evtchn operations to allow redirection to internal emulation
  hw/xen: Create initial XenStore nodes
  ...

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

2 files changed, 18 insertions, 16 deletions

diff --git a/hw/display/meson.build b/hw/display/meson.build
index f470179..4191694 100644
--- a/hw/display/meson.build
+++ b/hw/display/meson.build
@@ -14,7 +14,7 @@ softmmu_ss.add(when: 'CONFIG_PL110', if_true: files('pl110.c'))
 softmmu_ss.add(when: 'CONFIG_SII9022', if_true: files('sii9022.c'))
 softmmu_ss.add(when: 'CONFIG_SSD0303', if_true: files('ssd0303.c'))
 softmmu_ss.add(when: 'CONFIG_SSD0323', if_true: files('ssd0323.c'))
-softmmu_ss.add(when: 'CONFIG_XEN', if_true: files('xenfb.c'))
+softmmu_ss.add(when: 'CONFIG_XEN_BUS', if_true: files('xenfb.c'))
 
 softmmu_ss.add(when: 'CONFIG_VGA_PCI', if_true: files('vga-pci.c'))
 softmmu_ss.add(when: 'CONFIG_VGA_ISA', if_true: files('vga-isa.c'))
diff --git a/hw/display/xenfb.c b/hw/display/xenfb.c
index 260eb38..0074a9b 100644
--- a/hw/display/xenfb.c
+++ b/hw/display/xenfb.c
@@ -98,8 +98,9 @@ static int common_bind(struct common *c)
     if (xenstore_read_fe_int(&c->xendev, "event-channel", &c->xendev.remote_port) == -1)
         return -1;
 
-    c->page = xenforeignmemory_map(xen_fmem, c->xendev.dom,
-                                   PROT_READ | PROT_WRITE, 1, &mfn, NULL);
+    c->page = qemu_xen_foreignmem_map(c->xendev.dom, NULL,
+                                      PROT_READ | PROT_WRITE, 1, &mfn,
+                                      NULL);
     if (c->page == NULL)
         return -1;
 
@@ -115,7 +116,7 @@ static void common_unbind(struct common *c)
 {
     xen_pv_unbind_evtchn(&c->xendev);
     if (c->page) {
-        xenforeignmemory_unmap(xen_fmem, c->page, 1);
+        qemu_xen_foreignmem_unmap(c->page, 1);
         c->page = NULL;
     }
 }
@@ -488,27 +489,28 @@ static int xenfb_map_fb(struct XenFB *xenfb)
     }
 
     if (xenfb->pixels) {
-        munmap(xenfb->pixels, xenfb->fbpages * XC_PAGE_SIZE);
+        munmap(xenfb->pixels, xenfb->fbpages * XEN_PAGE_SIZE);
         xenfb->pixels = NULL;
     }
 
-    xenfb->fbpages = DIV_ROUND_UP(xenfb->fb_len, XC_PAGE_SIZE);
+    xenfb->fbpages = DIV_ROUND_UP(xenfb->fb_len, XEN_PAGE_SIZE);
     n_fbdirs = xenfb->fbpages * mode / 8;
-    n_fbdirs = DIV_ROUND_UP(n_fbdirs, XC_PAGE_SIZE);
+    n_fbdirs = DIV_ROUND_UP(n_fbdirs, XEN_PAGE_SIZE);
 
     pgmfns = g_new0(xen_pfn_t, n_fbdirs);
     fbmfns = g_new0(xen_pfn_t, xenfb->fbpages);
 
     xenfb_copy_mfns(mode, n_fbdirs, pgmfns, pd);
-    map = xenforeignmemory_map(xen_fmem, xenfb->c.xendev.dom,
-                               PROT_READ, n_fbdirs, pgmfns, NULL);
+    map = qemu_xen_foreignmem_map(xenfb->c.xendev.dom, NULL, PROT_READ,
+                                  n_fbdirs, pgmfns, NULL);
     if (map == NULL)
         goto out;
     xenfb_copy_mfns(mode, xenfb->fbpages, fbmfns, map);
-    xenforeignmemory_unmap(xen_fmem, map, n_fbdirs);
+    qemu_xen_foreignmem_unmap(map, n_fbdirs);
 
-    xenfb->pixels = xenforeignmemory_map(xen_fmem, xenfb->c.xendev.dom,
-            PROT_READ, xenfb->fbpages, fbmfns, NULL);
+    xenfb->pixels = qemu_xen_foreignmem_map(xenfb->c.xendev.dom, NULL,
+                                            PROT_READ, xenfb->fbpages,
+                                            fbmfns, NULL);
     if (xenfb->pixels == NULL)
         goto out;
 
@@ -526,8 +528,8 @@ static int xenfb_configure_fb(struct XenFB *xenfb, size_t fb_len_lim,
 {
     size_t mfn_sz = sizeof_field(struct xenfb_page, pd[0]);
     size_t pd_len = sizeof_field(struct xenfb_page, pd) / mfn_sz;
-    size_t fb_pages = pd_len * XC_PAGE_SIZE / mfn_sz;
-    size_t fb_len_max = fb_pages * XC_PAGE_SIZE;
+    size_t fb_pages = pd_len * XEN_PAGE_SIZE / mfn_sz;
+    size_t fb_len_max = fb_pages * XEN_PAGE_SIZE;
     int max_width, max_height;
 
     if (fb_len_lim > fb_len_max) {
@@ -927,8 +929,8 @@ static void fb_disconnect(struct XenLegacyDevice *xendev)
      *   Replacing the framebuffer with anonymous shared memory
      *   instead.  This releases the guest pages and keeps qemu happy.
      */
-    xenforeignmemory_unmap(xen_fmem, fb->pixels, fb->fbpages);
-    fb->pixels = mmap(fb->pixels, fb->fbpages * XC_PAGE_SIZE,
+    qemu_xen_foreignmem_unmap(fb->pixels, fb->fbpages);
+    fb->pixels = mmap(fb->pixels, fb->fbpages * XEN_PAGE_SIZE,
                       PROT_READ | PROT_WRITE, MAP_SHARED | MAP_ANON,
                       -1, 0);
     if (fb->pixels == MAP_FAILED) {