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KVM: SVM: Implement infrastructure for TSC_RATE_MSR

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This patch enhances the kvm_amd module with functions to
support the TSC_RATE_MSR which can be used to set a given
tsc frequency for the guest vcpu.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Joerg Roedel 2011-03-25 09:44:46 +01:00 committed by Avi Kivity
parent bfeed29d6d
commit fbc0db76b7
2 changed files with 54 additions and 1 deletions
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1
arch/x86/include/asm/msr-index.h
View File

@ -118,6 +118,7 @@
complete list. */
#define MSR_AMD64_PATCH_LEVEL 0x0000008b
#define MSR_AMD64_TSC_RATIO 0xc0000104
#define MSR_AMD64_NB_CFG 0xc001001f
#define MSR_AMD64_PATCH_LOADER 0xc0010020
#define MSR_AMD64_OSVW_ID_LENGTH 0xc0010140

54
arch/x86/kvm/svm.c
View File

@ -63,6 +63,8 @@ MODULE_LICENSE("GPL");
#define DEBUGCTL_RESERVED_BITS (~(0x3fULL))
#define TSC_RATIO_RSVD 0xffffff0000000000ULL
static bool erratum_383_found __read_mostly;
static const u32 host_save_user_msrs[] = {
@ -136,8 +138,13 @@ struct vcpu_svm {
unsigned int3_injected;
unsigned long int3_rip;
u32 apf_reason;
u64 tsc_ratio;
};
static DEFINE_PER_CPU(u64, current_tsc_ratio);
#define TSC_RATIO_DEFAULT 0x0100000000ULL
#define MSR_INVALID 0xffffffffU
static struct svm_direct_access_msrs {
@ -560,6 +567,10 @@ static int has_svm(void)
static void svm_hardware_disable(void *garbage)
{
/* Make sure we clean up behind us */
if (static_cpu_has(X86_FEATURE_TSCRATEMSR))
wrmsrl(MSR_AMD64_TSC_RATIO, TSC_RATIO_DEFAULT);
cpu_svm_disable();
}
@ -601,6 +612,11 @@ static int svm_hardware_enable(void *garbage)
wrmsrl(MSR_VM_HSAVE_PA, page_to_pfn(sd->save_area) << PAGE_SHIFT);
if (static_cpu_has(X86_FEATURE_TSCRATEMSR)) {
wrmsrl(MSR_AMD64_TSC_RATIO, TSC_RATIO_DEFAULT);
__get_cpu_var(current_tsc_ratio) = TSC_RATIO_DEFAULT;
}
svm_init_erratum_383();
return 0;
@ -843,6 +859,32 @@ static void init_sys_seg(struct vmcb_seg *seg, uint32_t type)
seg->base = 0;
}
static u64 __scale_tsc(u64 ratio, u64 tsc)
{
u64 mult, frac, _tsc;
mult = ratio >> 32;
frac = ratio & ((1ULL << 32) - 1);
_tsc = tsc;
_tsc *= mult;
_tsc += (tsc >> 32) * frac;
_tsc += ((tsc & ((1ULL << 32) - 1)) * frac) >> 32;
return _tsc;
}
static u64 svm_scale_tsc(struct kvm_vcpu *vcpu, u64 tsc)
{
struct vcpu_svm *svm = to_svm(vcpu);
u64 _tsc = tsc;
if (svm->tsc_ratio != TSC_RATIO_DEFAULT)
_tsc = __scale_tsc(svm->tsc_ratio, tsc);
return _tsc;
}
static void svm_write_tsc_offset(struct kvm_vcpu *vcpu, u64 offset)
{
struct vcpu_svm *svm = to_svm(vcpu);
@ -1037,6 +1079,8 @@ static struct kvm_vcpu *svm_create_vcpu(struct kvm *kvm, unsigned int id)
goto out;
}
svm->tsc_ratio = TSC_RATIO_DEFAULT;
err = kvm_vcpu_init(&svm->vcpu, kvm, id);
if (err)
goto free_svm;
@ -1130,6 +1174,12 @@ static void svm_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
for (i = 0; i < NR_HOST_SAVE_USER_MSRS; i++)
rdmsrl(host_save_user_msrs[i], svm->host_user_msrs[i]);
if (static_cpu_has(X86_FEATURE_TSCRATEMSR) &&
svm->tsc_ratio != __get_cpu_var(current_tsc_ratio)) {
__get_cpu_var(current_tsc_ratio) = svm->tsc_ratio;
wrmsrl(MSR_AMD64_TSC_RATIO, svm->tsc_ratio);
}
}
static void svm_vcpu_put(struct kvm_vcpu *vcpu)
@ -2784,7 +2834,9 @@ static int svm_get_msr(struct kvm_vcpu *vcpu, unsigned ecx, u64 *data)
case MSR_IA32_TSC: {
struct vmcb *vmcb = get_host_vmcb(svm);
*data = vmcb->control.tsc_offset + native_read_tsc();
*data = vmcb->control.tsc_offset +
svm_scale_tsc(vcpu, native_read_tsc());
break;
}
case MSR_STAR: