KVM: SVM: enable LBR virtualization

This patch implements the Last Branch Record Virtualization (LBRV) feature of
the AMD Barcelona and Phenom processors into the kvm-amd module. It will only
be enabled if the guest enables last branch recording in the DEBUG_CTL MSR. So
there is no increased world switch overhead when the guest doesn't use these
MSRs.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Markus Rechberger <markus.rechberger@amd.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>

1 files changed, 37 insertions, 2 deletions

diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index 281a2ffe1224..7d73e935dcc1 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -47,6 +47,8 @@ MODULE_LICENSE("GPL");
 #define SVM_FEATURE_LBRV (1 << 1)
 #define SVM_DEATURE_SVML (1 << 2)
 
+#define DEBUGCTL_RESERVED_BITS (~(0x3fULL))
+
 /* enable NPT for AMD64 and X86 with PAE */
 #if defined(CONFIG_X86_64) || defined(CONFIG_X86_PAE)
 static bool npt_enabled = true;
@@ -387,6 +389,28 @@ static void svm_vcpu_init_msrpm(u32 *msrpm)
         set_msr_interception(msrpm, MSR_IA32_SYSENTER_EIP, 1, 1);
 }
 
+static void svm_enable_lbrv(struct vcpu_svm *svm)
+{
+        u32 *msrpm = svm->msrpm;
+
+        svm->vmcb->control.lbr_ctl = 1;
+        set_msr_interception(msrpm, MSR_IA32_LASTBRANCHFROMIP, 1, 1);
+        set_msr_interception(msrpm, MSR_IA32_LASTBRANCHTOIP, 1, 1);
+        set_msr_interception(msrpm, MSR_IA32_LASTINTFROMIP, 1, 1);
+        set_msr_interception(msrpm, MSR_IA32_LASTINTTOIP, 1, 1);
+}
+
+static void svm_disable_lbrv(struct vcpu_svm *svm)
+{
+        u32 *msrpm = svm->msrpm;
+
+        svm->vmcb->control.lbr_ctl = 0;
+        set_msr_interception(msrpm, MSR_IA32_LASTBRANCHFROMIP, 0, 0);
+        set_msr_interception(msrpm, MSR_IA32_LASTBRANCHTOIP, 0, 0);
+        set_msr_interception(msrpm, MSR_IA32_LASTINTFROMIP, 0, 0);
+        set_msr_interception(msrpm, MSR_IA32_LASTINTTOIP, 0, 0);
+}
+
 static __init int svm_hardware_setup(void)
 {
         int cpu;
@@ -1231,8 +1255,19 @@ static int svm_set_msr(struct kvm_vcpu *vcpu, unsigned ecx, u64 data)
                 svm->vmcb->save.sysenter_esp = data;
                 break;
         case MSR_IA32_DEBUGCTLMSR:
-                pr_unimpl(vcpu, "%s: MSR_IA32_DEBUGCTLMSR 0x%llx, nop\n",
-                                __FUNCTION__, data);
+                if (!svm_has(SVM_FEATURE_LBRV)) {
+                        pr_unimpl(vcpu, "%s: MSR_IA32_DEBUGCTL 0x%llx, nop\n",
+                                        __FUNCTION__, data);
+                        break;
+                }
+                if (data & DEBUGCTL_RESERVED_BITS)
+                        return 1;
+
+                svm->vmcb->save.dbgctl = data;
+                if (data & (1ULL<<0))
+                        svm_enable_lbrv(svm);
+                else
+                        svm_disable_lbrv(svm);
                 break;
         case MSR_K7_EVNTSEL0:
         case MSR_K7_EVNTSEL1: