On Tuesday, November 27, 2012 11:13:12 PM George-Cristian Bîrzan wrote:
> On Tue, Nov 27, 2012 at 10:38 PM, Vadim Rozenfeld <[email protected]>
wrote:
> > I have some code which do both reference time and invariant TSC but it
> > will not work after migration. I will send it later today.
>
> Do you mean migrating guests? This is not an issue for us.
OK, but don't say I didn't warn you :)
There are two patches, one for kvm and another one for qemu.
you will probably need to rebase them.
Add "hv_tsc" cpu parameter to activate this feature.
you will probably need to deactivate hpet by adding "-no-hpet"
parameter as well.
best regards,
Vadim.
>
> Also, it would be much appreciated!
>
> --
> George-Cristian Bîrzan
diff --git a/arch/x86/include/asm/hyperv.h b/arch/x86/include/asm/hyperv.h
index b80420b..9c5ffef 100644
--- a/arch/x86/include/asm/hyperv.h
+++ b/arch/x86/include/asm/hyperv.h
@@ -136,6 +136,9 @@
/* MSR used to read the per-partition time reference counter */
#define HV_X64_MSR_TIME_REF_COUNT 0x40000020
+/* A partition's reference time stamp counter (TSC) page */
+#define HV_X64_MSR_REFERENCE_TSC 0x40000021
+
/* Define the virtual APIC registers */
#define HV_X64_MSR_EOI 0x40000070
#define HV_X64_MSR_ICR 0x40000071
@@ -179,6 +182,10 @@
#define HV_X64_MSR_APIC_ASSIST_PAGE_ADDRESS_MASK \
(~((1ull << HV_X64_MSR_APIC_ASSIST_PAGE_ADDRESS_SHIFT) - 1))
+#define HV_X64_MSR_TSC_REFERENCE_ENABLE 0x00000001
+#define HV_X64_MSR_TSC_REFERENCE_ADDRESS_SHIFT 12
+
+
#define HV_PROCESSOR_POWER_STATE_C0 0
#define HV_PROCESSOR_POWER_STATE_C1 1
#define HV_PROCESSOR_POWER_STATE_C2 2
@@ -191,4 +198,11 @@
#define HV_STATUS_INVALID_ALIGNMENT 4
#define HV_STATUS_INSUFFICIENT_BUFFERS 19
+typedef struct _HV_REFERENCE_TSC_PAGE {
+ uint32_t TscSequence;
+ uint32_t Rserved1;
+ uint64_t TscScale;
+ int64_t TscOffset;
+} HV_REFERENCE_TSC_PAGE, * PHV_REFERENCE_TSC_PAGE;
+
#endif
diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index b2e11f4..63ee09e 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -565,6 +565,8 @@ struct kvm_arch {
/* fields used by HYPER-V emulation */
u64 hv_guest_os_id;
u64 hv_hypercall;
+ u64 hv_ref_count;
+ u64 hv_tsc_page;
#ifdef CONFIG_KVM_MMU_AUDIT
int audit_point;
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 4f76417..4538295 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -813,7 +813,7 @@ EXPORT_SYMBOL_GPL(kvm_rdpmc);
static u32 msrs_to_save[] = {
MSR_KVM_SYSTEM_TIME, MSR_KVM_WALL_CLOCK,
MSR_KVM_SYSTEM_TIME_NEW, MSR_KVM_WALL_CLOCK_NEW,
- HV_X64_MSR_GUEST_OS_ID, HV_X64_MSR_HYPERCALL,
+ HV_X64_MSR_GUEST_OS_ID, HV_X64_MSR_HYPERCALL, HV_X64_MSR_REFERENCE_TSC,
HV_X64_MSR_APIC_ASSIST_PAGE, MSR_KVM_ASYNC_PF_EN, MSR_KVM_STEAL_TIME,
MSR_KVM_PV_EOI_EN,
MSR_IA32_SYSENTER_CS, MSR_IA32_SYSENTER_ESP, MSR_IA32_SYSENTER_EIP,
@@ -1428,6 +1428,8 @@ static bool kvm_hv_msr_partition_wide(u32 msr)
switch (msr) {
case HV_X64_MSR_GUEST_OS_ID:
case HV_X64_MSR_HYPERCALL:
+ case HV_X64_MSR_TIME_REF_COUNT:
+ case HV_X64_MSR_REFERENCE_TSC:
r = true;
break;
}
@@ -1438,6 +1440,7 @@ static bool kvm_hv_msr_partition_wide(u32 msr)
static int set_msr_hyperv_pw(struct kvm_vcpu *vcpu, u32 msr, u64 data)
{
struct kvm *kvm = vcpu->kvm;
+ unsigned long addr;
switch (msr) {
case HV_X64_MSR_GUEST_OS_ID:
@@ -1467,6 +1470,27 @@ static int set_msr_hyperv_pw(struct kvm_vcpu *vcpu, u32 msr, u64 data)
if (__copy_to_user((void __user *)addr, instructions, 4))
return 1;
kvm->arch.hv_hypercall = data;
+ kvm->arch.hv_ref_count = get_kernel_ns();
+ break;
+ }
+ case HV_X64_MSR_REFERENCE_TSC: {
+ HV_REFERENCE_TSC_PAGE tsc_ref;
+ tsc_ref.TscSequence =
+ boot_cpu_has(X86_FEATURE_CONSTANT_TSC) ? 1 : 0;
+ tsc_ref.TscScale =
+ ((10000LL << 32) /vcpu->arch.virtual_tsc_khz) << 32;
+ tsc_ref.TscOffset = 0;
+ if (!(data & HV_X64_MSR_TSC_REFERENCE_ENABLE)) {
+ kvm->arch.hv_tsc_page = data;
+ break;
+ }
+ addr = gfn_to_hva(vcpu->kvm, data >>
+ HV_X64_MSR_TSC_REFERENCE_ADDRESS_SHIFT);
+ if (kvm_is_error_hva(addr))
+ return 1;
+ if(__copy_to_user((void __user *)addr, &tsc_ref, sizeof(tsc_ref)))
+ return 1;
+ kvm->arch.hv_tsc_page = data;
break;
}
default:
@@ -1881,6 +1905,13 @@ static int get_msr_hyperv_pw(struct kvm_vcpu *vcpu, u32 msr, u64 *pdata)
case HV_X64_MSR_HYPERCALL:
data = kvm->arch.hv_hypercall;
break;
+ case HV_X64_MSR_TIME_REF_COUNT:
+ data = get_kernel_ns() - kvm->arch.hv_ref_count;
+ do_div(data, 100);
+ break;
+ case HV_X64_MSR_REFERENCE_TSC:
+ data = kvm->arch.hv_tsc_page;
+ break;
default:
vcpu_unimpl(vcpu, "Hyper-V unhandled rdmsr: 0x%x\n", msr);
return 1;
diff --git a/target-i386/cpu.c b/target-i386/cpu.c
index f3708e6..ad77b72 100644
--- a/target-i386/cpu.c
+++ b/target-i386/cpu.c
@@ -1250,6 +1250,8 @@ static int cpu_x86_find_by_name(x86_def_t *x86_cpu_def, const char *cpu_model)
hyperv_enable_relaxed_timing(true);
} else if (!strcmp(featurestr, "hv_vapic")) {
hyperv_enable_vapic_recommended(true);
+ } else if (!strcmp(featurestr, "hv_tsc")) {
+ hyperv_enable_tsc_recommended(true);
} else {
fprintf(stderr, "feature string `%s' not in format (+feature|-feature|feature=xyz)\n", featurestr);
goto error;
diff --git a/target-i386/hyperv.c b/target-i386/hyperv.c
index f284e99..bd581a1 100644
--- a/target-i386/hyperv.c
+++ b/target-i386/hyperv.c
@@ -15,6 +15,12 @@
static bool hyperv_vapic;
static bool hyperv_relaxed_timing;
static int hyperv_spinlock_attempts = HYPERV_SPINLOCK_NEVER_RETRY;
+static bool hyperv_tsc;
+
+void hyperv_enable_tsc_recommended(bool val)
+{
+ hyperv_tsc = val;
+}
void hyperv_enable_vapic_recommended(bool val)
{
@@ -42,12 +48,18 @@ bool hyperv_enabled(void)
bool hyperv_hypercall_available(void)
{
if (hyperv_vapic ||
+ hyperv_tsc ||
(hyperv_spinlock_attempts != HYPERV_SPINLOCK_NEVER_RETRY)) {
return true;
}
return false;
}
+bool hyperv_tsc_recommended(void)
+{
+ return hyperv_tsc;
+}
+
bool hyperv_vapic_recommended(void)
{
return hyperv_vapic;
diff --git a/target-i386/hyperv.h b/target-i386/hyperv.h
index bacb1d4..94c2d6e 100644
--- a/target-i386/hyperv.h
+++ b/target-i386/hyperv.h
@@ -27,10 +27,12 @@
#endif
#if !defined(CONFIG_USER_ONLY) && defined(CONFIG_KVM)
+void hyperv_enable_tsc_recommended(bool val);
void hyperv_enable_vapic_recommended(bool val);
void hyperv_enable_relaxed_timing(bool val);
void hyperv_set_spinlock_retries(int val);
#else
+static inline void hyperv_enable_tsc_recommended(bool val) { }
static inline void hyperv_enable_vapic_recommended(bool val) { }
static inline void hyperv_enable_relaxed_timing(bool val) { }
static inline void hyperv_set_spinlock_retries(int val) { }
@@ -38,6 +40,7 @@ static inline void hyperv_set_spinlock_retries(int val) { }
bool hyperv_enabled(void);
bool hyperv_hypercall_available(void);
+bool hyperv_tsc_recommended(void);
bool hyperv_vapic_recommended(void);
bool hyperv_relaxed_timing_enabled(void);
int hyperv_get_spinlock_retries(void);
diff --git a/target-i386/kvm.c b/target-i386/kvm.c
index 5b18383..dc7f259 100644
--- a/target-i386/kvm.c
+++ b/target-i386/kvm.c
@@ -390,13 +390,17 @@ int kvm_arch_init_vcpu(CPUX86State *env)
c = &cpuid_data.entries[cpuid_i++];
memset(c, 0, sizeof(*c));
c->function = KVM_CPUID_SIGNATURE;
- if (!hyperv_enabled()) {
- memcpy(signature, "KVMKVMKVM\0\0\0", 12);
- c->eax = 0;
- } else {
- memcpy(signature, "Microsoft Hv", 12);
+ memcpy(signature, "KVMKVMKVM\0\0\0", 12);
+ if (hyperv_enabled()) {
c->eax = HYPERV_CPUID_MIN;
}
+// if (!hyperv_enabled()) {
+// memcpy(signature, "KVMKVMKVM\0\0\0", 12);
+// c->eax = 0;
+// } else {
+// memcpy(signature, "Microsoft Hv", 12);
+// c->eax = HYPERV_CPUID_MIN;
+// }
c->ebx = signature[0];
c->ecx = signature[1];
c->edx = signature[2];
@@ -427,7 +431,11 @@ int kvm_arch_init_vcpu(CPUX86State *env)
c->eax |= HV_X64_MSR_HYPERCALL_AVAILABLE;
c->eax |= HV_X64_MSR_APIC_ACCESS_AVAILABLE;
}
-
+ if (hyperv_tsc_recommended()) {
+ c->eax |= HV_X64_MSR_HYPERCALL_AVAILABLE;
+ c->eax |= HV_X64_MSR_TIME_REF_COUNT_AVAILABLE;
+ c->eax |= 0x200;
+ }
c = &cpuid_data.entries[cpuid_i++];
memset(c, 0, sizeof(*c));
c->function = HYPERV_CPUID_ENLIGHTMENT_INFO;
@@ -445,14 +453,14 @@ int kvm_arch_init_vcpu(CPUX86State *env)
c->eax = 0x40;
c->ebx = 0x40;
- c = &cpuid_data.entries[cpuid_i++];
- memset(c, 0, sizeof(*c));
- c->function = KVM_CPUID_SIGNATURE_NEXT;
- memcpy(signature, "KVMKVMKVM\0\0\0", 12);
- c->eax = 0;
- c->ebx = signature[0];
- c->ecx = signature[1];
- c->edx = signature[2];
+// c = &cpuid_data.entries[cpuid_i++];
+// memset(c, 0, sizeof(*c));
+// c->function = KVM_CPUID_SIGNATURE_NEXT;
+// memcpy(signature, "KVMKVMKVM\0\0\0", 12);
+// c->eax = 0;
+// c->ebx = signature[0];
+// c->ecx = signature[1];
+// c->edx = signature[2];
}
has_msr_async_pf_en = c->eax & (1 << KVM_FEATURE_ASYNC_PF);
