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i386/cpu: add crash-information QOM property 

Windows reports BSOD parameters through Hyper-V crash MSRs. This
information is very useful for initial crash analysis and thus
it would be nice to have a way to fetch it.

Signed-off-by: Anton Nefedov <anton.nefedov@virtuozzo.com>
Signed-off-by: Denis V. Lunev <den@openvz.org>
Message-Id: <1487053524-18674-2-git-send-email-den@openvz.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Anton Nefedov 2017-02-14 09:25:22 +03:00 committed by Paolo Bonzini
parent d9e73d32a8
commit d187e08dc4
3 changed files with 75 additions and 0 deletions
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1
kvm-all.c
View File

@ -2000,6 +2000,7 @@ int kvm_cpu_exec(CPUState *cpu)
ret = EXCP_INTERRUPT;
break;
case KVM_SYSTEM_EVENT_CRASH:
kvm_cpu_synchronize_state(cpu);
qemu_mutex_lock_iothread();
qemu_system_guest_panicked();
qemu_mutex_unlock_iothread();

24
qapi-schema.json
View File

@ -5870,6 +5870,30 @@
{ 'enum': 'GuestPanicAction',
'data': [ 'pause', 'poweroff' ] }
##
# @GuestPanicInformation:
#
# Information about a guest panic
#
# Since: 2.9
##
{'union': 'GuestPanicInformation',
'data': { 'hyper-v': 'GuestPanicInformationHyperV' } }
##
# @GuestPanicInformationHyperV:
#
# Hyper-V specific guest panic information (HV crash MSRs)
#
# Since: 2.9
##
{'struct': 'GuestPanicInformationHyperV',
'data': { 'arg1': 'uint64',
'arg2': 'uint64',
'arg3': 'uint64',
'arg4': 'uint64',
'arg5': 'uint64' } }
##
# @rtc-reset-reinjection:
#

50
target/i386/cpu.c
View File

@ -3495,6 +3495,53 @@ static void x86_cpu_register_feature_bit_props(X86CPU *cpu,
x86_cpu_register_bit_prop(cpu, name, &cpu->env.features[w], bitnr);
}
static GuestPanicInformation *x86_cpu_get_crash_info(CPUState *cs)
{
X86CPU *cpu = X86_CPU(cs);
CPUX86State *env = &cpu->env;
GuestPanicInformation *panic_info = NULL;
if (env->features[FEAT_HYPERV_EDX] & HV_X64_GUEST_CRASH_MSR_AVAILABLE) {
GuestPanicInformationHyperV *panic_info_hv =
g_malloc0(sizeof(GuestPanicInformationHyperV));
panic_info = g_malloc0(sizeof(GuestPanicInformation));
panic_info->type = GUEST_PANIC_INFORMATION_KIND_HYPER_V;
panic_info->u.hyper_v.data = panic_info_hv;
assert(HV_X64_MSR_CRASH_PARAMS >= 5);
panic_info_hv->arg1 = env->msr_hv_crash_params[0];
panic_info_hv->arg2 = env->msr_hv_crash_params[1];
panic_info_hv->arg3 = env->msr_hv_crash_params[2];
panic_info_hv->arg4 = env->msr_hv_crash_params[3];
panic_info_hv->arg5 = env->msr_hv_crash_params[4];
}
return panic_info;
}
static void x86_cpu_get_crash_info_qom(Object *obj, Visitor *v,
const char *name, void *opaque,
Error **errp)
{
CPUState *cs = CPU(obj);
GuestPanicInformation *panic_info;
if (!cs->crash_occurred) {
error_setg(errp, "No crash occured");
return;
}
panic_info = x86_cpu_get_crash_info(cs);
if (panic_info == NULL) {
error_setg(errp, "No crash information");
return;
}
visit_type_GuestPanicInformation(v, "crash-information", &panic_info,
errp);
qapi_free_GuestPanicInformation(panic_info);
}
static void x86_cpu_initfn(Object *obj)
{
CPUState *cs = CPU(obj);
@ -3530,6 +3577,9 @@ static void x86_cpu_initfn(Object *obj)
x86_cpu_get_feature_words,
NULL, NULL, (void *)cpu->filtered_features, NULL);
object_property_add(obj, "crash-information", "GuestPanicInformation",
x86_cpu_get_crash_info_qom, NULL, NULL, NULL, NULL);
cpu->hyperv_spinlock_attempts = HYPERV_SPINLOCK_NEVER_RETRY;
for (w = 0; w < FEATURE_WORDS; w++) {