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Commit 80b7706e authored by Joerg Roedel's avatar Joerg Roedel Committed by Avi Kivity
Browse files

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: default avatarJoerg Roedel <joerg.roedel@amd.com>
Signed-off-by: default avatarAvi Kivity <avi@qumranet.com>
parent b8836737

drivers/kvm/svm.c

+13 −0
Original line number Diff line number Diff line
@@ -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);