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-rw-r--r--arch/x86/include/asm/kvm_host.h3
-rw-r--r--arch/x86/include/asm/kvm_x86_emulate.h3
-rw-r--r--arch/x86/kvm/svm.c32
-rw-r--r--arch/x86/kvm/vmx.c49
-rw-r--r--arch/x86/kvm/x86.c2
5 files changed, 63 insertions, 26 deletions
diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index ab7de4a1195..16d1481aa23 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -508,6 +508,8 @@ struct kvm_x86_ops {
void (*run)(struct kvm_vcpu *vcpu, struct kvm_run *run);
int (*handle_exit)(struct kvm_run *run, struct kvm_vcpu *vcpu);
void (*skip_emulated_instruction)(struct kvm_vcpu *vcpu);
+ void (*set_interrupt_shadow)(struct kvm_vcpu *vcpu, int mask);
+ u32 (*get_interrupt_shadow)(struct kvm_vcpu *vcpu, int mask);
void (*patch_hypercall)(struct kvm_vcpu *vcpu,
unsigned char *hypercall_addr);
void (*set_irq)(struct kvm_vcpu *vcpu, int vec);
@@ -519,7 +521,6 @@ struct kvm_x86_ops {
void (*enable_nmi_window)(struct kvm_vcpu *vcpu);
void (*enable_irq_window)(struct kvm_vcpu *vcpu);
void (*update_cr8_intercept)(struct kvm_vcpu *vcpu, int tpr, int irr);
- void (*drop_interrupt_shadow)(struct kvm_vcpu *vcpu);
int (*set_tss_addr)(struct kvm *kvm, unsigned int addr);
int (*get_tdp_level)(void);
u64 (*get_mt_mask)(struct kvm_vcpu *vcpu, gfn_t gfn, bool is_mmio);
diff --git a/arch/x86/include/asm/kvm_x86_emulate.h b/arch/x86/include/asm/kvm_x86_emulate.h
index 6a159732881..be40d6e2b6b 100644
--- a/arch/x86/include/asm/kvm_x86_emulate.h
+++ b/arch/x86/include/asm/kvm_x86_emulate.h
@@ -143,6 +143,9 @@ struct decode_cache {
struct fetch_cache fetch;
};
+#define X86_SHADOW_INT_MOV_SS 1
+#define X86_SHADOW_INT_STI 2
+
struct x86_emulate_ctxt {
/* Register state before/after emulation. */
struct kvm_vcpu *vcpu;
diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index f994c6df78b..8b5ffbd55c1 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -202,6 +202,27 @@ static int is_external_interrupt(u32 info)
return info == (SVM_EVTINJ_VALID | SVM_EVTINJ_TYPE_INTR);
}
+static u32 svm_get_interrupt_shadow(struct kvm_vcpu *vcpu, int mask)
+{
+ struct vcpu_svm *svm = to_svm(vcpu);
+ u32 ret = 0;
+
+ if (svm->vmcb->control.int_state & SVM_INTERRUPT_SHADOW_MASK)
+ ret |= X86_SHADOW_INT_STI | X86_SHADOW_INT_MOV_SS;
+ return ret & mask;
+}
+
+static void svm_set_interrupt_shadow(struct kvm_vcpu *vcpu, int mask)
+{
+ struct vcpu_svm *svm = to_svm(vcpu);
+
+ if (mask == 0)
+ svm->vmcb->control.int_state &= ~SVM_INTERRUPT_SHADOW_MASK;
+ else
+ svm->vmcb->control.int_state |= SVM_INTERRUPT_SHADOW_MASK;
+
+}
+
static void skip_emulated_instruction(struct kvm_vcpu *vcpu)
{
struct vcpu_svm *svm = to_svm(vcpu);
@@ -215,7 +236,7 @@ static void skip_emulated_instruction(struct kvm_vcpu *vcpu)
__func__, kvm_rip_read(vcpu), svm->next_rip);
kvm_rip_write(vcpu, svm->next_rip);
- svm->vmcb->control.int_state &= ~SVM_INTERRUPT_SHADOW_MASK;
+ svm_set_interrupt_shadow(vcpu, 0);
}
static int has_svm(void)
@@ -2259,12 +2280,6 @@ static void pre_svm_run(struct vcpu_svm *svm)
new_asid(svm, svm_data);
}
-static void svm_drop_interrupt_shadow(struct kvm_vcpu *vcpu)
-{
- struct vcpu_svm *svm = to_svm(vcpu);
- svm->vmcb->control.int_state &= ~SVM_INTERRUPT_SHADOW_MASK;
-}
-
static void svm_inject_nmi(struct kvm_vcpu *vcpu)
{
struct vcpu_svm *svm = to_svm(vcpu);
@@ -2667,6 +2682,8 @@ static struct kvm_x86_ops svm_x86_ops = {
.run = svm_vcpu_run,
.handle_exit = handle_exit,
.skip_emulated_instruction = skip_emulated_instruction,
+ .set_interrupt_shadow = svm_set_interrupt_shadow,
+ .get_interrupt_shadow = svm_get_interrupt_shadow,
.patch_hypercall = svm_patch_hypercall,
.set_irq = svm_set_irq,
.set_nmi = svm_inject_nmi,
@@ -2676,7 +2693,6 @@ static struct kvm_x86_ops svm_x86_ops = {
.enable_nmi_window = enable_nmi_window,
.enable_irq_window = enable_irq_window,
.update_cr8_intercept = update_cr8_intercept,
- .drop_interrupt_shadow = svm_drop_interrupt_shadow,
.set_tss_addr = svm_set_tss_addr,
.get_tdp_level = get_npt_level,
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index e8a5649f9c1..f3ab27b5a6b 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -736,23 +736,45 @@ static void vmx_set_rflags(struct kvm_vcpu *vcpu, unsigned long rflags)
vmcs_writel(GUEST_RFLAGS, rflags);
}
+static u32 vmx_get_interrupt_shadow(struct kvm_vcpu *vcpu, int mask)
+{
+ u32 interruptibility = vmcs_read32(GUEST_INTERRUPTIBILITY_INFO);
+ int ret = 0;
+
+ if (interruptibility & GUEST_INTR_STATE_STI)
+ ret |= X86_SHADOW_INT_STI;
+ if (interruptibility & GUEST_INTR_STATE_MOV_SS)
+ ret |= X86_SHADOW_INT_MOV_SS;
+
+ return ret & mask;
+}
+
+static void vmx_set_interrupt_shadow(struct kvm_vcpu *vcpu, int mask)
+{
+ u32 interruptibility_old = vmcs_read32(GUEST_INTERRUPTIBILITY_INFO);
+ u32 interruptibility = interruptibility_old;
+
+ interruptibility &= ~(GUEST_INTR_STATE_STI | GUEST_INTR_STATE_MOV_SS);
+
+ if (mask & X86_SHADOW_INT_MOV_SS)
+ interruptibility |= GUEST_INTR_STATE_MOV_SS;
+ if (mask & X86_SHADOW_INT_STI)
+ interruptibility |= GUEST_INTR_STATE_STI;
+
+ if ((interruptibility != interruptibility_old))
+ vmcs_write32(GUEST_INTERRUPTIBILITY_INFO, interruptibility);
+}
+
static void skip_emulated_instruction(struct kvm_vcpu *vcpu)
{
unsigned long rip;
- u32 interruptibility;
rip = kvm_rip_read(vcpu);
rip += vmcs_read32(VM_EXIT_INSTRUCTION_LEN);
kvm_rip_write(vcpu, rip);
- /*
- * We emulated an instruction, so temporary interrupt blocking
- * should be removed, if set.
- */
- interruptibility = vmcs_read32(GUEST_INTERRUPTIBILITY_INFO);
- if (interruptibility & 3)
- vmcs_write32(GUEST_INTERRUPTIBILITY_INFO,
- interruptibility & ~3);
+ /* skipping an emulated instruction also counts */
+ vmx_set_interrupt_shadow(vcpu, 0);
}
static void vmx_queue_exception(struct kvm_vcpu *vcpu, unsigned nr,
@@ -2400,12 +2422,6 @@ out:
return ret;
}
-void vmx_drop_interrupt_shadow(struct kvm_vcpu *vcpu)
-{
- vmcs_clear_bits(GUEST_INTERRUPTIBILITY_INFO,
- GUEST_INTR_STATE_STI | GUEST_INTR_STATE_MOV_SS);
-}
-
static void enable_irq_window(struct kvm_vcpu *vcpu)
{
u32 cpu_based_vm_exec_control;
@@ -3649,6 +3665,8 @@ static struct kvm_x86_ops vmx_x86_ops = {
.run = vmx_vcpu_run,
.handle_exit = vmx_handle_exit,
.skip_emulated_instruction = skip_emulated_instruction,
+ .set_interrupt_shadow = vmx_set_interrupt_shadow,
+ .get_interrupt_shadow = vmx_get_interrupt_shadow,
.patch_hypercall = vmx_patch_hypercall,
.set_irq = vmx_inject_irq,
.set_nmi = vmx_inject_nmi,
@@ -3658,7 +3676,6 @@ static struct kvm_x86_ops vmx_x86_ops = {
.enable_nmi_window = enable_nmi_window,
.enable_irq_window = enable_irq_window,
.update_cr8_intercept = update_cr8_intercept,
- .drop_interrupt_shadow = vmx_drop_interrupt_shadow,
.set_tss_addr = vmx_set_tss_addr,
.get_tdp_level = get_ept_level,
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 3c4c327490a..7475b029b2a 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -3178,7 +3178,7 @@ static void inject_pending_irq(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
kvm_run->request_interrupt_window;
if (vcpu->guest_debug & KVM_GUESTDBG_SINGLESTEP)
- kvm_x86_ops->drop_interrupt_shadow(vcpu);
+ kvm_x86_ops->set_interrupt_shadow(vcpu, 0);
inject_irq(vcpu);
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-30 22:40:35 +0000