diff options
| -rw-r--r-- | drivers/kvm/svm.c | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/drivers/kvm/svm.c b/drivers/kvm/svm.c index 303e95957e7b..b7e1410e4007 100644 --- a/drivers/kvm/svm.c +++ b/drivers/kvm/svm.c @@ -44,6 +44,10 @@ MODULE_LICENSE("GPL"); #define KVM_EFER_LMA (1 << 10) #define KVM_EFER_LME (1 << 8) +#define SVM_FEATURE_NPT (1 << 0) +#define SVM_FEATURE_LBRV (1 << 1) +#define SVM_DEATURE_SVML (1 << 2) + unsigned long iopm_base; unsigned long msrpm_base; @@ -68,6 +72,7 @@ struct svm_cpu_data { }; static DEFINE_PER_CPU(struct svm_cpu_data *, svm_data); +static uint32_t svm_features; struct svm_init_data { int cpu; @@ -82,6 +87,11 @@ static u32 msrpm_ranges[] = {0, 0xc0000000, 0xc0010000}; #define MAX_INST_SIZE 15 +static inline u32 svm_has(u32 feat) +{ + return svm_features & feat; +} + static unsigned get_addr_size(struct kvm_vcpu *vcpu) { struct vmcb_save_area *sa = &vcpu->svm->vmcb->save; @@ -302,6 +312,7 @@ static void svm_hardware_enable(void *garbage) svm_data->asid_generation = 1; svm_data->max_asid = cpuid_ebx(SVM_CPUID_FUNC) - 1; svm_data->next_asid = svm_data->max_asid + 1; + svm_features = cpuid_edx(SVM_CPUID_FUNC); asm volatile ( "sgdt %0" : "=m"(gdt_descr) ); gdt = (struct desc_struct *)gdt_descr.address; @@ -511,6 +522,8 @@ static void init_vmcb(struct vmcb *vmcb) control->msrpm_base_pa = msrpm_base; control->tsc_offset = 0; control->int_ctl = V_INTR_MASKING_MASK; + if (svm_has(SVM_FEATURE_LBRV)) + control->lbr_ctl = 1ULL; init_seg(&save->es); init_seg(&save->ss); |