Merge remote-tracking branch 'remotes/cohuck/tags/s390x-20180619' into staging

- cleanup in virtio-ccw
- accommodate guests using vfio-ccw without specifying unlimited
  prefetch, but actually working fine
- add cpu model for the z14 Model ZR1
- add support for pxelinux.cfg-style network booting to the s390x
  firmware

# gpg: Signature made Tue 19 Jun 2018 10:33:06 BST
# gpg:                using RSA key DECF6B93C6F02FAF
# gpg: Good signature from "Cornelia Huck <conny@cornelia-huck.de>"
# gpg:                 aka "Cornelia Huck <huckc@linux.vnet.ibm.com>"
# gpg:                 aka "Cornelia Huck <cornelia.huck@de.ibm.com>"
# gpg:                 aka "Cornelia Huck <cohuck@kernel.org>"
# gpg:                 aka "Cornelia Huck <cohuck@redhat.com>"
# Primary key fingerprint: C3D0 D66D C362 4FF6 A8C0  18CE DECF 6B93 C6F0 2FAF

* remotes/cohuck/tags/s390x-20180619:
  pc-bios/s390-ccw: Update the s390-netboot.img binary
  pc-bios/s390-ccw: Optimize the s390-netboot.img for size
  pc-bios/s390-ccw/net: Try to load pxelinux.cfg file accoring to the UUID
  pc-bios/s390-ccw/net: Add support for pxelinux-style config files
  pc-bios/s390-ccw/net: Update code for the latest changes in SLOF
  roms: Update SLOF submodule to current status
  pc-bios/s390-ccw: define loadparm length
  s390x/cpumodels: add z14 Model ZR1
  s390x/ipl: Try to detect Linux vs non Linux for initial IPL PSW
  vfio-ccw: remove orb.c64 (64 bit data addresses) check
  vfio-ccw: add force unlimited prefetch property
  virtio-ccw: clean up notify

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

4 files changed, 66 insertions, 21 deletions

diff --git a/hw/s390x/css.c b/hw/s390x/css.c
index 56c3fa8..5424ea4 100644
--- a/hw/s390x/css.c
+++ b/hw/s390x/css.c
@@ -1199,18 +1199,6 @@ static IOInstEnding sch_handle_start_func_passthrough(SubchDev *sch)
         assert(orb != NULL);
         p->intparm = orb->intparm;
     }
-
-    /*
-     * Only support prefetch enable mode.
-     * Only support 64bit addressing idal.
-     */
-    if (!(orb->ctrl0 & ORB_CTRL0_MASK_PFCH) ||
-        !(orb->ctrl0 & ORB_CTRL0_MASK_C64)) {
-        warn_report("vfio-ccw requires PFCH and C64 flags set");
-        sch_gen_unit_exception(sch);
-        css_inject_io_interrupt(sch);
-        return IOINST_CC_EXPECTED;
-    }
     return s390_ccw_cmd_request(sch);
 }
 
diff --git a/hw/s390x/ipl.c b/hw/s390x/ipl.c
index 04245b5..0d67349 100644
--- a/hw/s390x/ipl.c
+++ b/hw/s390x/ipl.c
@@ -29,6 +29,7 @@
 #include "exec/exec-all.h"
 
 #define KERN_IMAGE_START                0x010000UL
+#define LINUX_MAGIC_ADDR                0x010008UL
 #define KERN_PARM_AREA                  0x010480UL
 #define INITRD_START                    0x800000UL
 #define INITRD_PARM_START               0x010408UL
@@ -105,7 +106,9 @@ static uint64_t bios_translate_addr(void *opaque, uint64_t srcaddr)
 static void s390_ipl_realize(DeviceState *dev, Error **errp)
 {
     S390IPLState *ipl = S390_IPL(dev);
-    uint64_t pentry = KERN_IMAGE_START;
+    uint32_t *ipl_psw;
+    uint64_t pentry;
+    char *magic;
     int kernel_size;
     Error *err = NULL;
 
@@ -157,10 +160,24 @@ static void s390_ipl_realize(DeviceState *dev, Error **errp)
                                NULL, 1, EM_S390, 0, 0);
         if (kernel_size < 0) {
             kernel_size = load_image_targphys(ipl->kernel, 0, ram_size);
-        }
-        if (kernel_size < 0) {
-            error_setg(&err, "could not load kernel '%s'", ipl->kernel);
-            goto error;
+            if (kernel_size < 0) {
+                error_setg(&err, "could not load kernel '%s'", ipl->kernel);
+                goto error;
+            }
+            /* if this is Linux use KERN_IMAGE_START */
+            magic = rom_ptr(LINUX_MAGIC_ADDR);
+            if (magic && !memcmp(magic, "S390EP", 6)) {
+                pentry = KERN_IMAGE_START;
+            } else {
+                /* if not Linux load the address of the (short) IPL PSW */
+                ipl_psw = rom_ptr(4);
+                if (ipl_psw) {
+                    pentry = be32_to_cpu(*ipl_psw) & 0x7fffffffUL;
+                } else {
+                    error_setg(&err, "Could not get IPL PSW");
+                    goto error;
+                }
+            }
         }
         /*
          * Is it a Linux kernel (starting at 0x10000)? If yes, we fill in the
diff --git a/hw/s390x/virtio-ccw.c b/hw/s390x/virtio-ccw.c
index 0a9bec4..b92a85d 100644
--- a/hw/s390x/virtio-ccw.c
+++ b/hw/s390x/virtio-ccw.c
@@ -1001,10 +1001,15 @@ static void virtio_ccw_notify(DeviceState *d, uint16_t vector)
     SubchDev *sch = ccw_dev->sch;
     uint64_t indicators;
 
-    /* queue indicators + secondary indicators */
-    if (vector >= VIRTIO_QUEUE_MAX + 64) {
+    if (vector == VIRTIO_NO_VECTOR) {
         return;
     }
+    /*
+     * vector < VIRTIO_QUEUE_MAX: notification for a virtqueue
+     * vector == VIRTIO_QUEUE_MAX: configuration change notification
+     * bits beyond that are unused and should never be notified for
+     */
+    assert(vector <= VIRTIO_QUEUE_MAX);
 
     if (vector < VIRTIO_QUEUE_MAX) {
         if (!dev->indicators) {
@@ -1027,6 +1032,7 @@ static void virtio_ccw_notify(DeviceState *d, uint16_t vector)
                 css_adapter_interrupt(CSS_IO_ADAPTER_VIRTIO, dev->thinint_isc);
             }
         } else {
+            assert(vector < NR_CLASSIC_INDICATOR_BITS);
             indicators = address_space_ldq(&address_space_memory,
                                            dev->indicators->addr,
                                            MEMTXATTRS_UNSPECIFIED,
@@ -1040,12 +1046,11 @@ static void virtio_ccw_notify(DeviceState *d, uint16_t vector)
         if (!dev->indicators2) {
             return;
         }
-        vector = 0;
         indicators = address_space_ldq(&address_space_memory,
                                        dev->indicators2->addr,
                                        MEMTXATTRS_UNSPECIFIED,
                                        NULL);
-        indicators |= 1ULL << vector;
+        indicators |= 1ULL;
         address_space_stq(&address_space_memory, dev->indicators2->addr,
                           indicators, MEMTXATTRS_UNSPECIFIED, NULL);
         css_conditional_io_interrupt(sch);
diff --git a/hw/vfio/ccw.c b/hw/vfio/ccw.c
index 76e4e8c..351b305 100644
--- a/hw/vfio/ccw.c
+++ b/hw/vfio/ccw.c
@@ -33,8 +33,30 @@ typedef struct VFIOCCWDevice {
     uint64_t io_region_offset;
     struct ccw_io_region *io_region;
     EventNotifier io_notifier;
+    bool force_orb_pfch;
+    bool warned_orb_pfch;
 } VFIOCCWDevice;
 
+static inline void warn_once(bool *warned, const char *fmt, ...)
+{
+    va_list ap;
+
+    if (!warned || *warned) {
+        return;
+    }
+    *warned = true;
+    va_start(ap, fmt);
+    warn_vreport(fmt, ap);
+    va_end(ap);
+}
+
+static inline void warn_once_pfch(VFIOCCWDevice *vcdev, SubchDev *sch,
+                                  const char *msg)
+{
+    warn_once(&vcdev->warned_orb_pfch, "vfio-ccw (devno %x.%x.%04x): %s",
+              sch->cssid, sch->ssid, sch->devno, msg);
+}
+
 static void vfio_ccw_compute_needs_reset(VFIODevice *vdev)
 {
     vdev->needs_reset = false;
@@ -55,6 +77,18 @@ static IOInstEnding vfio_ccw_handle_request(SubchDev *sch)
     struct ccw_io_region *region = vcdev->io_region;
     int ret;
 
+    if (!(sch->orb.ctrl0 & ORB_CTRL0_MASK_PFCH)) {
+        if (!(vcdev->force_orb_pfch)) {
+            warn_once_pfch(vcdev, sch, "requires PFCH flag set");
+            sch_gen_unit_exception(sch);
+            css_inject_io_interrupt(sch);
+            return IOINST_CC_EXPECTED;
+        } else {
+            sch->orb.ctrl0 |= ORB_CTRL0_MASK_PFCH;
+            warn_once_pfch(vcdev, sch, "PFCH flag forced");
+        }
+    }
+
     QEMU_BUILD_BUG_ON(sizeof(region->orb_area) != sizeof(ORB));
     QEMU_BUILD_BUG_ON(sizeof(region->scsw_area) != sizeof(SCSW));
     QEMU_BUILD_BUG_ON(sizeof(region->irb_area) != sizeof(IRB));
@@ -430,6 +464,7 @@ static void vfio_ccw_unrealize(DeviceState *dev, Error **errp)
 
 static Property vfio_ccw_properties[] = {
     DEFINE_PROP_STRING("sysfsdev", VFIOCCWDevice, vdev.sysfsdev),
+    DEFINE_PROP_BOOL("force-orb-pfch", VFIOCCWDevice, force_orb_pfch, false),
     DEFINE_PROP_END_OF_LIST(),
 };