[PATCH 1/2] replace drop_interrupt_shadow by set_interrupt_shadow

Glauber Costa
2009-05-08T20:23:56Z

This patch replaces drop_interrupt_shadow with the more
general set_interrupt_shadow, that can either drop or raise
it, depending on its parameter.

Signed-off-by: Glauber Costa <glommer@redhat.com>
CC: H. Peter Anvin <hpa@zytor.com>
CC: Avi Kivity <avi@redhat.com>
CC: Gleb Natapov <gleb@redhat.com>
---
arch/x86/include/asm/kvm_host.h | 3 +-
arch/x86/include/asm/kvm_x86_emulate.h | 3 ++
arch/x86/kvm/svm.c | 32 +++++++++++++----
arch/x86/kvm/vmx.c | 56 ++++++++++++++++++++++---------
arch/x86/kvm/x86.c | 2 +-
5 files changed, 70 insertions(+), 26 deletions(-)

diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 8e680c3..b63a3b2 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -510,6 +510,8 @@ 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);
void (*patch_hypercall)(struct kvm_vcpu *vcpu,
unsigned char *hypercall_addr);
void (*set_irq)(struct kvm_vcpu *vcpu, int vec);
@@ -521,7 +523,6 @@ 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 6a15973..be40d6e 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 ef43a18..a9669ff 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)
+{
+ 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;
+}
+
+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)
@@ -2229,12 +2250,6 @@ 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);
@@ -2637,6 +2652,8 @@ 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,
@@ -2646,7 +2663,6 @@ 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 e8a5649..6c805c6 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -736,23 +736,52 @@ 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)
+{
+ 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;
+}
+
+static void vmx_set_interrupt_shadow(struct kvm_vcpu *vcpu, int mask)
+{
+ u32 interruptibility_old = vmcs_read32(GUEST_INTERRUPTIBILITY_INFO);
+ u32 interruptibility = interruptibility_old;
+
+ switch (mask) {
+ case 0:
+ interruptibility &= ~((GUEST_INTR_STATE_STI | GUEST_INTR_STATE_MOV_SS));
+ break;
+ case X86_SHADOW_INT_MOV_SS:
+ interruptibility |= GUEST_INTR_STATE_MOV_SS;
+ break;
+ case X86_SHADOW_INT_STI:
+ interruptibility |= GUEST_INTR_STATE_STI;
+ break;
+ default:
+ printk(KERN_ERR "Bogus mask for interrupt shadow!\n");
+ }
+
+ 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 +2429,6 @@ 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 +3672,8 @@ 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 +3683,6 @@ 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 2d7082c..3d8fcc5 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -3161,7 +3161,7 @@ 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);

--
1.5.6.6