KVM: SVM: Use svm_get_lbr_vmcb() helper to handle writes to DEBUGCTL

Use the recently introduced svm_get_lbr_vmcb() instead an open coded
equivalent to retrieve the target VMCB when emulating writes to
MSR_IA32_DEBUGCTLMSR.

No functional change intended.

Link: https://lore.kernel.org/r/20230607203519.1570167-4-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>

diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c
index 6fa918b..d76c8a0 100644 (file)
--- a/arch/x86/kvm/svm/svm.c
+++ b/arch/x86/kvm/svm/svm.c
@@ -3052,13 +3052,8 @@ static int svm_set_msr(struct kvm_vcpu *vcpu, struct msr_data *msr)
                if (data & DEBUGCTL_RESERVED_BITS)
                        return 1;
 
-               if (svm->vmcb->control.virt_ext & LBR_CTL_ENABLE_MASK)
-                       svm->vmcb->save.dbgctl = data;
-               else
-                       svm->vmcb01.ptr->save.dbgctl = data;
-
+               svm_get_lbr_vmcb(svm)->save.dbgctl = data;
                svm_update_lbrv(vcpu);
-
                break;
        case MSR_VM_HSAVE_PA:
                /*