Gitweb:     
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=80b7706e4cbaa51d65bd6fea83bd0e59856f50e9
Commit:     80b7706e4cbaa51d65bd6fea83bd0e59856f50e9
Parent:     b8836737d92c139be770eae3d6574e33d1224caf
Author:     Joerg Roedel <[EMAIL PROTECTED]>
AuthorDate: Fri Mar 30 17:02:14 2007 +0300
Committer:  Avi Kivity <[EMAIL PROTECTED]>
CommitDate: Thu May 3 10:52:28 2007 +0300

    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 <[EMAIL PROTECTED]>
    Signed-off-by: Avi Kivity <[EMAIL PROTECTED]>
---
 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 303e959..b7e1410 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);
-
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