KVM Hyper-V based guests can notify hypervisor about
occurred guest crash by writing into Hyper-V crash MSR's.
This patch does handling and migration of HV_X64_MSR_CRASH_P0-P4,
HV_X64_MSR_CRASH_CTL msrs. User can enable these MSR's by
'hv-crash' option.
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>
Message-Id: <
1435924905-8926-13-git-send-email-den@openvz.org>
[Folks, stop abrviating variable names!!! Also fix compilation on
non-Linux/x86. - Paolo]
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
bool hyperv_relaxed_timing;
int hyperv_spinlock_attempts;
bool hyperv_time;
+ bool hyperv_crash;
bool check_cpuid;
bool enforce_cpuid;
bool expose_kvm;
DEFINE_PROP_BOOL("hv-relaxed", X86CPU, hyperv_relaxed_timing, false),
DEFINE_PROP_BOOL("hv-vapic", X86CPU, hyperv_vapic, false),
DEFINE_PROP_BOOL("hv-time", X86CPU, hyperv_time, false),
+ DEFINE_PROP_BOOL("hv-crash", X86CPU, hyperv_crash, false),
DEFINE_PROP_BOOL("check", X86CPU, check_cpuid, false),
DEFINE_PROP_BOOL("enforce", X86CPU, enforce_cpuid, false),
DEFINE_PROP_BOOL("kvm", X86CPU, expose_kvm, true),
#include "config.h"
#include "qemu-common.h"
+#include "standard-headers/asm-x86/hyperv.h"
#ifdef TARGET_X86_64
#define TARGET_LONG_BITS 64
uint64_t msr_hv_guest_os_id;
uint64_t msr_hv_vapic;
uint64_t msr_hv_tsc;
+ uint64_t msr_hv_crash_params[HV_X64_MSR_CRASH_PARAMS];
/* exception/interrupt handling */
int error_code;
static bool has_msr_hv_hypercall;
static bool has_msr_hv_vapic;
static bool has_msr_hv_tsc;
+static bool has_msr_hv_crash;
static bool has_msr_mtrr;
static bool has_msr_xss;
return kvm_check_extension(cs->kvm_state, KVM_CAP_HYPERV) > 0 &&
(hyperv_hypercall_available(cpu) ||
cpu->hyperv_time ||
- cpu->hyperv_relaxed_timing);
+ cpu->hyperv_relaxed_timing ||
+ cpu->hyperv_crash);
}
static Error *invtsc_mig_blocker;
c->eax |= 0x200;
has_msr_hv_tsc = true;
}
+ if (cpu->hyperv_crash && has_msr_hv_crash) {
+ c->edx |= HV_X64_GUEST_CRASH_MSR_AVAILABLE;
+ }
+
c = &cpuid_data.entries[cpuid_i++];
c->function = HYPERV_CPUID_ENLIGHTMENT_INFO;
if (cpu->hyperv_relaxed_timing) {
has_msr_xss = true;
continue;
}
+ if (kvm_msr_list->indices[i] == HV_X64_MSR_CRASH_CTL) {
+ has_msr_hv_crash = true;
+ continue;
+ }
}
}
kvm_msr_entry_set(&msrs[n++], HV_X64_MSR_REFERENCE_TSC,
env->msr_hv_tsc);
}
+ if (has_msr_hv_crash) {
+ int j;
+
+ for (j = 0; j < HV_X64_MSR_CRASH_PARAMS; j++)
+ kvm_msr_entry_set(&msrs[n++], HV_X64_MSR_CRASH_P0 + j,
+ env->msr_hv_crash_params[j]);
+
+ kvm_msr_entry_set(&msrs[n++], HV_X64_MSR_CRASH_CTL,
+ HV_X64_MSR_CRASH_CTL_NOTIFY);
+ }
if (has_msr_mtrr) {
kvm_msr_entry_set(&msrs[n++], MSR_MTRRdefType, env->mtrr_deftype);
kvm_msr_entry_set(&msrs[n++],
if (has_msr_hv_tsc) {
msrs[n++].index = HV_X64_MSR_REFERENCE_TSC;
}
+ if (has_msr_hv_crash) {
+ int j;
+
+ for (j = 0; j < HV_X64_MSR_CRASH_PARAMS; j++) {
+ msrs[n++].index = HV_X64_MSR_CRASH_P0 + j;
+ }
+ }
if (has_msr_mtrr) {
msrs[n++].index = MSR_MTRRdefType;
msrs[n++].index = MSR_MTRRfix64K_00000;
case HV_X64_MSR_REFERENCE_TSC:
env->msr_hv_tsc = msrs[i].data;
break;
+ case HV_X64_MSR_CRASH_P0 ... HV_X64_MSR_CRASH_P4:
+ env->msr_hv_crash_params[index - HV_X64_MSR_CRASH_P0] = msrs[i].data;
+ break;
case MSR_MTRRdefType:
env->mtrr_deftype = msrs[i].data;
break;
}
};
+static bool hyperv_crash_enable_needed(void *opaque)
+{
+ X86CPU *cpu = opaque;
+ CPUX86State *env = &cpu->env;
+ int i;
+
+ for (i = 0; i < HV_X64_MSR_CRASH_PARAMS; i++) {
+ if (env->msr_hv_crash_params[i]) {
+ return true;
+ }
+ }
+ return false;
+}
+
+static const VMStateDescription vmstate_msr_hyperv_crash = {
+ .name = "cpu/msr_hyperv_crash",
+ .version_id = 1,
+ .minimum_version_id = 1,
+ .needed = hyperv_crash_enable_needed,
+ .fields = (VMStateField[]) {
+ VMSTATE_UINT64_ARRAY(env.msr_hv_crash_params,
+ X86CPU, HV_X64_MSR_CRASH_PARAMS),
+ VMSTATE_END_OF_LIST()
+ }
+};
+
static bool avx512_needed(void *opaque)
{
X86CPU *cpu = opaque;
&vmstate_msr_hypercall_hypercall,
&vmstate_msr_hyperv_vapic,
&vmstate_msr_hyperv_time,
+ &vmstate_msr_hyperv_crash,
&vmstate_avx512,
&vmstate_xss,
NULL