Merge branch 'kvm-updates/2.6.32' of git://git.kernel.org/pub/scm/virt/kvm/kvm

* 'kvm-updates/2.6.32' of git://git.kernel.org/pub/scm/virt/kvm/kvm:
  KVM: add support for change_pte mmu notifiers
  KVM: MMU: add SPTE_HOST_WRITEABLE flag to the shadow ptes
  KVM: MMU: dont hold pagecount reference for mapped sptes pages
  KVM: Prevent overflow in KVM_GET_SUPPORTED_CPUID
  KVM: VMX: flush TLB with INVEPT on cpu migration
  KVM: fix LAPIC timer period overflow
  KVM: s390: fix memsize >= 4G
  KVM: SVM: Handle tsc in svm_get_msr/svm_set_msr correctly
  KVM: SVM: Fix tsc offset adjustment when running nested

1 files changed, 19 insertions, 6 deletions

diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index 944cc9c04b3c..c17404add91f 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -767,6 +767,8 @@ static void svm_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
                 rdtscll(tsc_this);
                 delta = vcpu->arch.host_tsc - tsc_this;
                 svm->vmcb->control.tsc_offset += delta;
+                if (is_nested(svm))
+                        svm->nested.hsave->control.tsc_offset += delta;
                 vcpu->cpu = cpu;
                 kvm_migrate_timers(vcpu);
                 svm->asid_generation = 0;
@@ -2057,10 +2059,14 @@ static int svm_get_msr(struct kvm_vcpu *vcpu, unsigned ecx, u64 *data)
 
         switch (ecx) {
         case MSR_IA32_TSC: {
-                u64 tsc;
+                u64 tsc_offset;
+
+                if (is_nested(svm))
+                        tsc_offset = svm->nested.hsave->control.tsc_offset;
+                else
+                        tsc_offset = svm->vmcb->control.tsc_offset;
 
-                rdtscll(tsc);
-                *data = svm->vmcb->control.tsc_offset + tsc;
+                *data = tsc_offset + native_read_tsc();
                 break;
         }
         case MSR_K6_STAR:
@@ -2146,10 +2152,17 @@ static int svm_set_msr(struct kvm_vcpu *vcpu, unsigned ecx, u64 data)
 
         switch (ecx) {
         case MSR_IA32_TSC: {
-                u64 tsc;
+                u64 tsc_offset = data - native_read_tsc();
+                u64 g_tsc_offset = 0;
+
+                if (is_nested(svm)) {
+                        g_tsc_offset = svm->vmcb->control.tsc_offset -
+                                       svm->nested.hsave->control.tsc_offset;
+                        svm->nested.hsave->control.tsc_offset = tsc_offset;
+                }
+
+                svm->vmcb->control.tsc_offset = tsc_offset + g_tsc_offset;
 
-                rdtscll(tsc);
-                svm->vmcb->control.tsc_offset = data - tsc;
                 break;
         }
         case MSR_K6_STAR: