[Qemu-devel] [PATCH 11/11] qemu/kvm: mark in cpu state that hyper-v crash occured

["Denis V. Lunev" <den@openvz.org>]

From: Andrey Smetanin <asmetanin@virtuozzo.com>

It's usually impossible to understand from Hyper-V
crash msr's that crash happened because ctl msr
always contains the same value HV_X64_MSR_CRASH_CTL_NOTIFY.
To solve it add a particalar value hv_crash_occurred
inside CPU state and migrate this value with crash msr's.

Signed-off-by: Andrey Smetanin <asmetanin@virtuozzo.com>
Signed-off-by: Denis V. Lunev <den@openvz.org>
CC: Paolo Bonzini <pbonzini@redhat.com>
CC: Andreas Färber <afaerber@suse.de>
---
 target-i386/cpu.h     | 1 +
 target-i386/kvm.c     | 1 +
 target-i386/machine.c | 1 +
 3 files changed, 3 insertions(+)

diff --git a/target-i386/cpu.h b/target-i386/cpu.h
index 474a93e..2958cdc 100644
--- a/target-i386/cpu.h
+++ b/target-i386/cpu.h
@@ -907,6 +907,7 @@ typedef struct CPUX86State {
     uint64_t msr_hv_tsc;
     uint64_t msr_hv_crash_prm[HV_X64_MSR_CRASH_PARAMS];
     uint64_t msr_hv_crash_ctl;
+    uint8_t hv_crash_occurred;
 
     /* exception/interrupt handling */
     int error_code;
diff --git a/target-i386/kvm.c b/target-i386/kvm.c
index 690677b..2c8d00f 100644
--- a/target-i386/kvm.c
+++ b/target-i386/kvm.c
@@ -2616,6 +2616,7 @@ int kvm_arch_handle_hv_crash(CPUState *cs)
             break;
         }
     }
+    env->hv_crash_occurred = 1;
 
     return 0;
 }
diff --git a/target-i386/machine.c b/target-i386/machine.c
index 15b3f31..4f72ba8 100644
--- a/target-i386/machine.c
+++ b/target-i386/machine.c
@@ -679,6 +679,7 @@ static const VMStateDescription vmstate_msr_hyperv_crash = {
         VMSTATE_UINT64(env.msr_hv_crash_ctl, X86CPU),
         VMSTATE_UINT64_ARRAY(env.msr_hv_crash_prm,
                              X86CPU, HV_X64_MSR_CRASH_PARAMS),
+        VMSTATE_UINT8(env.hv_crash_occurred, X86CPU),
         VMSTATE_END_OF_LIST()
     }
 };
-- 
1.9.1