KVM: SVM: Cleanup NMI singlestep

Push the NMI-related singlestep variable into vcpu_svm. It's dealing
with an AMD-specific deficit, nothing generic for x86.

Acked-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>

 arch/x86/include/asm/kvm_host.h |    1 -
 arch/x86/kvm/svm.c              |   12 +++++++-----
 2 files changed, 7 insertions(+), 6 deletions(-)
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>

1 files changed, 7 insertions, 5 deletions

diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index 170b2d9c6909..ffa6ad216b71 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -107,6 +107,8 @@ struct vcpu_svm {
         u32 *msrpm;
 
         struct nested_state nested;
+
+        bool nmi_singlestep;
 };
 
 /* enable NPT for AMD64 and X86 with PAE */
@@ -1050,7 +1052,7 @@ static void update_db_intercept(struct kvm_vcpu *vcpu)
         svm->vmcb->control.intercept_exceptions &=
                 ~((1 << DB_VECTOR) | (1 << BP_VECTOR));
 
-        if (vcpu->arch.singlestep)
+        if (svm->nmi_singlestep)
                 svm->vmcb->control.intercept_exceptions |= (1 << DB_VECTOR);
 
         if (vcpu->guest_debug & KVM_GUESTDBG_ENABLE) {
@@ -1195,13 +1197,13 @@ static int db_interception(struct vcpu_svm *svm)
 
         if (!(svm->vcpu.guest_debug &
               (KVM_GUESTDBG_SINGLESTEP | KVM_GUESTDBG_USE_HW_BP)) &&
-                !svm->vcpu.arch.singlestep) {
+                !svm->nmi_singlestep) {
                 kvm_queue_exception(&svm->vcpu, DB_VECTOR);
                 return 1;
         }
 
-        if (svm->vcpu.arch.singlestep) {
-                svm->vcpu.arch.singlestep = false;
+        if (svm->nmi_singlestep) {
+                svm->nmi_singlestep = false;
                 if (!(svm->vcpu.guest_debug & KVM_GUESTDBG_SINGLESTEP))
                         svm->vmcb->save.rflags &=
                                 ~(X86_EFLAGS_TF | X86_EFLAGS_RF);
@@ -2543,7 +2545,7 @@ static void enable_nmi_window(struct kvm_vcpu *vcpu)
         /* Something prevents NMI from been injected. Single step over
            possible problem (IRET or exception injection or interrupt
            shadow) */
-        vcpu->arch.singlestep = true;
+        svm->nmi_singlestep = true;
         svm->vmcb->save.rflags |= (X86_EFLAGS_TF | X86_EFLAGS_RF);
         update_db_intercept(vcpu);
 }