KVM: SVM: Use get_host_vmcb function in svm_get_msr for TSC

This patch replaces the open-coded vmcb-selection for the
TSC calculation with the new get_host_vmcb helper function
introduced in this patchset.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index cde5392..5038786 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -2630,14 +2630,9 @@
 
 	switch (ecx) {
 	case MSR_IA32_TSC: {
-		u64 tsc_offset;
+		struct vmcb *vmcb = get_host_vmcb(svm);
 
-		if (is_guest_mode(vcpu))
-			tsc_offset = svm->nested.hsave->control.tsc_offset;
-		else
-			tsc_offset = svm->vmcb->control.tsc_offset;
-
-		*data = tsc_offset + native_read_tsc();
+		*data = vmcb->control.tsc_offset + native_read_tsc();
 		break;
 	}
 	case MSR_STAR: