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KVM: SVM: enable LBRV virtualization if available 

This patch enables the virtualization of the last branch record MSRs on
SVM if this feature is available in hardware. It also introduces a small
and simple check feature for specific SVM extensions.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>
This commit is contained in:
Joerg Roedel 2007-03-30 17:02:14 +03:00 committed by Avi Kivity
parent b8836737d9
commit 80b7706e4c
1 changed files with 13 additions and 0 deletions
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13
drivers/kvm/svm.c
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@ -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);