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authorGleb Natapov <gleb@redhat.com>2009-05-11 13:35:52 +0300
committerAvi Kivity <avi@redhat.com>2009-06-10 11:48:59 +0300
commit44c11430b52cbad0a467bc023a802d122dfd285c (patch)
tree1be73025a2019b6de60836cbaa56bf5c8cb6f9db /arch/x86
parent6a8b1d13121f8226783987dc7ddd861ee2245410 (diff)
KVM: inject NMI after IRET from a previous NMI, not before.
If NMI is received during handling of another NMI it should be injected immediately after IRET from previous NMI handler, but SVM intercept IRET before instruction execution so we can't inject pending NMI at this point and there is not way to request exit when NMI window opens. This patch fix SVM code to open NMI window after IRET by single stepping over IRET instruction. Signed-off-by: Gleb Natapov <gleb@redhat.com> Signed-off-by: Avi Kivity <avi@redhat.com>
Diffstat (limited to 'arch/x86')
-rw-r--r--arch/x86/include/asm/kvm_host.h2
-rw-r--r--arch/x86/kvm/svm.c62
2 files changed, 52 insertions, 12 deletions
diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 1d6c3f757cb..82129437e87 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -358,6 +358,7 @@ 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;
@@ -771,6 +772,7 @@ enum {
#define HF_HIF_MASK (1 << 1)
#define HF_VINTR_MASK (1 << 2)
#define HF_NMI_MASK (1 << 3)
+#define HF_IRET_MASK (1 << 4)
/*
* Hardware virtualization extension instructions may fault if a
diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index 377c4f17d17..71510e07e69 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -965,15 +965,16 @@ static void svm_set_segment(struct kvm_vcpu *vcpu,
}
-static int svm_guest_debug(struct kvm_vcpu *vcpu, struct kvm_guest_debug *dbg)
+static void update_db_intercept(struct kvm_vcpu *vcpu)
{
- int old_debug = vcpu->guest_debug;
struct vcpu_svm *svm = to_svm(vcpu);
- vcpu->guest_debug = dbg->control;
-
svm->vmcb->control.intercept_exceptions &=
~((1 << DB_VECTOR) | (1 << BP_VECTOR));
+
+ if (vcpu->arch.singlestep)
+ svm->vmcb->control.intercept_exceptions |= (1 << DB_VECTOR);
+
if (vcpu->guest_debug & KVM_GUESTDBG_ENABLE) {
if (vcpu->guest_debug &
(KVM_GUESTDBG_SINGLESTEP | KVM_GUESTDBG_USE_HW_BP))
@@ -984,6 +985,16 @@ static int svm_guest_debug(struct kvm_vcpu *vcpu, struct kvm_guest_debug *dbg)
1 << BP_VECTOR;
} else
vcpu->guest_debug = 0;
+}
+
+static int svm_guest_debug(struct kvm_vcpu *vcpu, struct kvm_guest_debug *dbg)
+{
+ int old_debug = vcpu->guest_debug;
+ struct vcpu_svm *svm = to_svm(vcpu);
+
+ vcpu->guest_debug = dbg->control;
+
+ update_db_intercept(vcpu);
if (vcpu->guest_debug & KVM_GUESTDBG_USE_HW_BP)
svm->vmcb->save.dr7 = dbg->arch.debugreg[7];
@@ -1133,14 +1144,30 @@ static int pf_interception(struct vcpu_svm *svm, struct kvm_run *kvm_run)
static int db_interception(struct vcpu_svm *svm, struct kvm_run *kvm_run)
{
if (!(svm->vcpu.guest_debug &
- (KVM_GUESTDBG_SINGLESTEP | KVM_GUESTDBG_USE_HW_BP))) {
+ (KVM_GUESTDBG_SINGLESTEP | KVM_GUESTDBG_USE_HW_BP)) &&
+ !svm->vcpu.arch.singlestep) {
kvm_queue_exception(&svm->vcpu, DB_VECTOR);
return 1;
}
- kvm_run->exit_reason = KVM_EXIT_DEBUG;
- kvm_run->debug.arch.pc = svm->vmcb->save.cs.base + svm->vmcb->save.rip;
- kvm_run->debug.arch.exception = DB_VECTOR;
- return 0;
+
+ if (svm->vcpu.arch.singlestep) {
+ svm->vcpu.arch.singlestep = false;
+ if (!(svm->vcpu.guest_debug & KVM_GUESTDBG_SINGLESTEP))
+ svm->vmcb->save.rflags &=
+ ~(X86_EFLAGS_TF | X86_EFLAGS_RF);
+ update_db_intercept(&svm->vcpu);
+ }
+
+ if (svm->vcpu.guest_debug &
+ (KVM_GUESTDBG_SINGLESTEP | KVM_GUESTDBG_USE_HW_BP)){
+ kvm_run->exit_reason = KVM_EXIT_DEBUG;
+ kvm_run->debug.arch.pc =
+ svm->vmcb->save.cs.base + svm->vmcb->save.rip;
+ kvm_run->debug.arch.exception = DB_VECTOR;
+ return 0;
+ }
+
+ return 1;
}
static int bp_interception(struct vcpu_svm *svm, struct kvm_run *kvm_run)
@@ -1887,7 +1914,7 @@ static int iret_interception(struct vcpu_svm *svm, struct kvm_run *kvm_run)
{
++svm->vcpu.stat.nmi_window_exits;
svm->vmcb->control.intercept &= ~(1UL << INTERCEPT_IRET);
- svm->vcpu.arch.hflags &= ~HF_NMI_MASK;
+ svm->vcpu.arch.hflags |= HF_IRET_MASK;
return 1;
}
@@ -2357,8 +2384,16 @@ static void enable_nmi_window(struct kvm_vcpu *vcpu)
{
struct vcpu_svm *svm = to_svm(vcpu);
- if (svm->vmcb->control.int_state & SVM_INTERRUPT_SHADOW_MASK)
- enable_irq_window(vcpu);
+ if ((svm->vcpu.arch.hflags & (HF_NMI_MASK | HF_IRET_MASK))
+ == HF_NMI_MASK)
+ return; /* IRET will cause a vm exit */
+
+ /* Something prevents NMI from been injected. Single step over
+ possible problem (IRET or exception injection or interrupt
+ shadow) */
+ vcpu->arch.singlestep = true;
+ svm->vmcb->save.rflags |= (X86_EFLAGS_TF | X86_EFLAGS_RF);
+ update_db_intercept(vcpu);
}
static int svm_set_tss_addr(struct kvm *kvm, unsigned int addr)
@@ -2401,6 +2436,9 @@ static void svm_complete_interrupts(struct vcpu_svm *svm)
int type;
u32 exitintinfo = svm->vmcb->control.exit_int_info;
+ if (svm->vcpu.arch.hflags & HF_IRET_MASK)
+ svm->vcpu.arch.hflags &= ~(HF_NMI_MASK | HF_IRET_MASK);
+
svm->vcpu.arch.nmi_injected = false;
kvm_clear_exception_queue(&svm->vcpu);
kvm_clear_interrupt_queue(&svm->vcpu);