diff options
| author | Joerg Roedel <joerg.roedel@amd.com> | 2009-10-12 11:42:44 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2009-10-12 12:40:19 -0700 |
| commit | 719a1256a0ecf6e181ac0ffe06c84550d5af6fe3 (patch) | |
| tree | c939985eb16518777b0dffda2b64972a5237f279 | |
| parent | 89cc56416e963a723b568157e53fa4c796ffefa5 (diff) | |
KVM: SVM: Handle tsc in svm_get_msr/svm_set_msr correctly
commit 20824f30bb0b8ae0a4099895fd4509f54cf2e1e2 upstream.
When running nested we need to touch the l1 guests
tsc_offset. Otherwise changes will be lost or a wrong value
be read.
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
| -rw-r--r-- | arch/x86/kvm/svm.c | 23 |
1 files changed, 17 insertions, 6 deletions
diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c index aafd8bf47e77..4ac68999c7b0 100644 --- a/arch/x86/kvm/svm.c +++ b/arch/x86/kvm/svm.c @@ -1956,10 +1956,14 @@ static int svm_get_msr(struct kvm_vcpu *vcpu, unsigned ecx, u64 *data) switch (ecx) { case MSR_IA32_TIME_STAMP_COUNTER: { - u64 tsc; + u64 tsc_offset; - rdtscll(tsc); - *data = svm->vmcb->control.tsc_offset + tsc; + if (is_nested(svm)) + tsc_offset = svm->hsave->control.tsc_offset; + else + tsc_offset = svm->vmcb->control.tsc_offset; + + *data = tsc_offset + native_read_tsc(); break; } case MSR_K6_STAR: @@ -2046,10 +2050,17 @@ static int svm_set_msr(struct kvm_vcpu *vcpu, unsigned ecx, u64 data) switch (ecx) { case MSR_IA32_TIME_STAMP_COUNTER: { - 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->hsave->control.tsc_offset; + svm->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: |