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i386/kvm: add support for Hyper-V reenlightenment MSRs

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KVM recently gained support for Hyper-V Reenlightenment MSRs which are
required to make KVM-on-Hyper-V enable TSC page clocksource to its guests
when INVTSC is not passed to it (and it is not passed by default in Qemu
as it effectively blocks migration).

Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Message-Id: <20180411115036.31832-2-vkuznets@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Vitaly Kuznetsov 2018-04-11 13:50:36 +02:00 committed by Paolo Bonzini
parent 45b47130f4
commit ba6a4fd95d
5 changed files with 77 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
target/i386/cpu.c
View File

@ -416,7 +416,8 @@ static FeatureWordInfo feature_word_info[FEATURE_WORDS] = {
NULL /* hv_vpindex_access */, NULL /* hv_msr_reset_access */,
NULL /* hv_msr_stats_access */, NULL /* hv_reftsc_access */,
NULL /* hv_msr_idle_access */, NULL /* hv_msr_frequency_access */,
NULL, NULL, NULL, NULL,
NULL /* hv_msr_debug_access */, NULL /* hv_msr_reenlightenment_access */,
NULL, NULL,
NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL,
NULL, NULL, NULL, NULL,
@ -4770,6 +4771,7 @@ static Property x86_cpu_properties[] = {
DEFINE_PROP_BOOL("hv-synic", X86CPU, hyperv_synic, false),
DEFINE_PROP_BOOL("hv-stimer", X86CPU, hyperv_stimer, false),
DEFINE_PROP_BOOL("hv-frequencies", X86CPU, hyperv_frequencies, false),
DEFINE_PROP_BOOL("hv-reenlightenment", X86CPU, hyperv_reenlightenment, false),
DEFINE_PROP_BOOL("check", X86CPU, check_cpuid, true),
DEFINE_PROP_BOOL("enforce", X86CPU, enforce_cpuid, false),
DEFINE_PROP_BOOL("kvm", X86CPU, expose_kvm, true),

4
target/i386/cpu.h
View File

@ -1174,6 +1174,9 @@ typedef struct CPUX86State {
uint64_t msr_hv_synic_sint[HV_SINT_COUNT];
uint64_t msr_hv_stimer_config[HV_STIMER_COUNT];
uint64_t msr_hv_stimer_count[HV_STIMER_COUNT];
uint64_t msr_hv_reenlightenment_control;
uint64_t msr_hv_tsc_emulation_control;
uint64_t msr_hv_tsc_emulation_status;
uint64_t msr_rtit_ctrl;
uint64_t msr_rtit_status;
@ -1297,6 +1300,7 @@ struct X86CPU {
bool hyperv_synic;
bool hyperv_stimer;
bool hyperv_frequencies;
bool hyperv_reenlightenment;
bool check_cpuid;
bool enforce_cpuid;
bool expose_kvm;

9
target/i386/hyperv-proto.h
View File

@ -35,7 +35,7 @@
#define HV_RESET_AVAILABLE (1u << 7)
#define HV_REFERENCE_TSC_AVAILABLE (1u << 9)
#define HV_ACCESS_FREQUENCY_MSRS (1u << 11)
#define HV_ACCESS_REENLIGHTENMENTS_CONTROL (1u << 13)
/*
* HV_CPUID_FEATURES.EDX bits
@ -129,6 +129,13 @@
#define HV_X64_MSR_CRASH_CTL 0x40000105
#define HV_CRASH_CTL_NOTIFY (1ull << 63)
/*
* Reenlightenment notification MSRs
*/
#define HV_X64_MSR_REENLIGHTENMENT_CONTROL 0x40000106
#define HV_X64_MSR_TSC_EMULATION_CONTROL 0x40000107
#define HV_X64_MSR_TSC_EMULATION_STATUS 0x40000108
/*
* Hypercall status code
*/

39
target/i386/kvm.c
View File

@ -90,6 +90,7 @@ static bool has_msr_hv_runtime;
static bool has_msr_hv_synic;
static bool has_msr_hv_stimer;
static bool has_msr_hv_frequencies;
static bool has_msr_hv_reenlightenment;
static bool has_msr_xss;
static bool has_msr_spec_ctrl;
static bool has_msr_smi_count;
@ -583,7 +584,8 @@ static bool hyperv_enabled(X86CPU *cpu)
cpu->hyperv_vpindex ||
cpu->hyperv_runtime ||
cpu->hyperv_synic ||
cpu->hyperv_stimer);
cpu->hyperv_stimer ||
cpu->hyperv_reenlightenment);
}
static int kvm_arch_set_tsc_khz(CPUState *cs)
@ -669,6 +671,16 @@ static int hyperv_handle_properties(CPUState *cs)
}
env->features[FEAT_HYPERV_EDX] |= HV_GUEST_CRASH_MSR_AVAILABLE;
}
if (cpu->hyperv_reenlightenment) {
if (!has_msr_hv_reenlightenment) {
fprintf(stderr,
"Hyper-V Reenlightenment MSRs "
"(requested by 'hv-reenlightenment' cpu flag) "
"are not supported by kernel\n");
return -ENOSYS;
}
env->features[FEAT_HYPERV_EAX] |= HV_ACCESS_REENLIGHTENMENTS_CONTROL;
}
env->features[FEAT_HYPERV_EDX] |= HV_CPU_DYNAMIC_PARTITIONING_AVAILABLE;
if (cpu->hyperv_reset) {
if (!has_msr_hv_reset) {
@ -1215,6 +1227,9 @@ static int kvm_get_supported_msrs(KVMState *s)
case HV_X64_MSR_TSC_FREQUENCY:
has_msr_hv_frequencies = true;
break;
case HV_X64_MSR_REENLIGHTENMENT_CONTROL:
has_msr_hv_reenlightenment = true;
break;
case MSR_IA32_SPEC_CTRL:
has_msr_spec_ctrl = true;
break;
@ -1778,6 +1793,14 @@ static int kvm_put_msrs(X86CPU *cpu, int level)
kvm_msr_entry_add(cpu, HV_X64_MSR_REFERENCE_TSC,
env->msr_hv_tsc);
}
if (cpu->hyperv_reenlightenment) {
kvm_msr_entry_add(cpu, HV_X64_MSR_REENLIGHTENMENT_CONTROL,
env->msr_hv_reenlightenment_control);
kvm_msr_entry_add(cpu, HV_X64_MSR_TSC_EMULATION_CONTROL,
env->msr_hv_tsc_emulation_control);
kvm_msr_entry_add(cpu, HV_X64_MSR_TSC_EMULATION_STATUS,
env->msr_hv_tsc_emulation_status);
}
}
if (cpu->hyperv_vapic) {
kvm_msr_entry_add(cpu, HV_X64_MSR_APIC_ASSIST_PAGE,
@ -2140,6 +2163,11 @@ static int kvm_get_msrs(X86CPU *cpu)
if (cpu->hyperv_time) {
kvm_msr_entry_add(cpu, HV_X64_MSR_REFERENCE_TSC, 0);
}
if (cpu->hyperv_reenlightenment) {
kvm_msr_entry_add(cpu, HV_X64_MSR_REENLIGHTENMENT_CONTROL, 0);
kvm_msr_entry_add(cpu, HV_X64_MSR_TSC_EMULATION_CONTROL, 0);
kvm_msr_entry_add(cpu, HV_X64_MSR_TSC_EMULATION_STATUS, 0);
}
if (has_msr_hv_crash) {
int j;
@ -2397,6 +2425,15 @@ static int kvm_get_msrs(X86CPU *cpu)
env->msr_hv_stimer_count[(index - HV_X64_MSR_STIMER0_COUNT)/2] =
msrs[i].data;
break;
case HV_X64_MSR_REENLIGHTENMENT_CONTROL:
env->msr_hv_reenlightenment_control = msrs[i].data;
break;
case HV_X64_MSR_TSC_EMULATION_CONTROL:
env->msr_hv_tsc_emulation_control = msrs[i].data;
break;
case HV_X64_MSR_TSC_EMULATION_STATUS:
env->msr_hv_tsc_emulation_status = msrs[i].data;
break;
case MSR_MTRRdefType:
env->mtrr_deftype = msrs[i].data;
break;

24
target/i386/machine.c
View File

@ -713,6 +713,29 @@ static const VMStateDescription vmstate_msr_hyperv_stimer = {
}
};
static bool hyperv_reenlightenment_enable_needed(void *opaque)
{
X86CPU *cpu = opaque;
CPUX86State *env = &cpu->env;
return env->msr_hv_reenlightenment_control != 0 ||
env->msr_hv_tsc_emulation_control != 0 ||
env->msr_hv_tsc_emulation_status != 0;
}
static const VMStateDescription vmstate_msr_hyperv_reenlightenment = {
.name = "cpu/msr_hyperv_reenlightenment",
.version_id = 1,
.minimum_version_id = 1,
.needed = hyperv_reenlightenment_enable_needed,
.fields = (VMStateField[]) {
VMSTATE_UINT64(env.msr_hv_reenlightenment_control, X86CPU),
VMSTATE_UINT64(env.msr_hv_tsc_emulation_control, X86CPU),
VMSTATE_UINT64(env.msr_hv_tsc_emulation_status, X86CPU),
VMSTATE_END_OF_LIST()
}
};
static bool avx512_needed(void *opaque)
{
X86CPU *cpu = opaque;
@ -1005,6 +1028,7 @@ VMStateDescription vmstate_x86_cpu = {
&vmstate_msr_hyperv_runtime,
&vmstate_msr_hyperv_synic,
&vmstate_msr_hyperv_stimer,
&vmstate_msr_hyperv_reenlightenment,
&vmstate_avx512,
&vmstate_xss,
&vmstate_tsc_khz,