[PATCH 13/35] KVM: SVM: Cleanup NMI singlestep

Avi Kivity
2009-11-19T13:35:08Z

From: Jan Kiszka <jan.kiszka@web.de>

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>
---
arch/x86/include/asm/kvm_host.h | 1 -
arch/x86/kvm/svm.c | 12 +++++++-----
2 files changed, 7 insertions(+), 6 deletions(-)

diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 2536fbd..4d994ad 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -354,7 +354,6 @@ struct kvm_vcpu_arch {
unsigned int time_offset;
struct page *time_page;

- bool singlestep; /* guest is single stepped by KVM */
bool nmi_pending;
bool nmi_injected;

diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index 170b2d9..ffa6ad2 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);
}
--
1.6.5.2