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KVM: VMX: refactor/fix IRQ and NMI injectability determination 

There are currently two ways in VMX to check if an IRQ or NMI can be
injected:
 - vmx_{nmi|irq}_enabled and
 - vcpu.arch.{nmi|interrupt}_window_open.
Even worse, one test (at the end of vmx_vcpu_run) uses an inconsistent,
likely incorrect logic.

This patch consolidates and unifies the tests over
{nmi|interrupt}_window_open as cache + vmx_update_window_states
for updating the cache content.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Jan Kiszka 2008-09-26 09:30:49 +02:00 committed by Avi Kivity
parent 448fa4a9c5
commit 33f089ca5a
2 changed files with 22 additions and 25 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
arch/x86/include/asm/kvm_host.h
View File

@ -327,6 +327,7 @@ struct kvm_vcpu_arch {
bool nmi_pending;
bool nmi_injected;
bool nmi_window_open;
u64 mtrr[0x100];
};

46
arch/x86/kvm/vmx.c
View File

@ -2362,6 +2362,21 @@ static void vmx_inject_nmi(struct kvm_vcpu *vcpu)
INTR_TYPE_NMI_INTR | INTR_INFO_VALID_MASK | NMI_VECTOR);
}
static void vmx_update_window_states(struct kvm_vcpu *vcpu)
{
u32 guest_intr = vmcs_read32(GUEST_INTERRUPTIBILITY_INFO);
vcpu->arch.nmi_window_open =
!(guest_intr & (GUEST_INTR_STATE_STI |
GUEST_INTR_STATE_MOV_SS |
GUEST_INTR_STATE_NMI));
vcpu->arch.interrupt_window_open =
((vmcs_readl(GUEST_RFLAGS) & X86_EFLAGS_IF) &&
!(guest_intr & (GUEST_INTR_STATE_STI |
GUEST_INTR_STATE_MOV_SS)));
}
static void kvm_do_inject_irq(struct kvm_vcpu *vcpu)
{
int word_index = __ffs(vcpu->arch.irq_summary);
@ -2374,15 +2389,12 @@ static void kvm_do_inject_irq(struct kvm_vcpu *vcpu)
kvm_queue_interrupt(vcpu, irq);
}
static void do_interrupt_requests(struct kvm_vcpu *vcpu,
struct kvm_run *kvm_run)
{
u32 cpu_based_vm_exec_control;
vcpu->arch.interrupt_window_open =
((vmcs_readl(GUEST_RFLAGS) & X86_EFLAGS_IF) &&
(vmcs_read32(GUEST_INTERRUPTIBILITY_INFO) & 3) == 0);
vmx_update_window_states(vcpu);
if (vcpu->arch.interrupt_window_open &&
vcpu->arch.irq_summary && !vcpu->arch.interrupt.pending)
@ -3075,22 +3087,6 @@ static void enable_nmi_window(struct kvm_vcpu *vcpu)
vmcs_write32(CPU_BASED_VM_EXEC_CONTROL, cpu_based_vm_exec_control);
}
static int vmx_nmi_enabled(struct kvm_vcpu *vcpu)
{
u32 guest_intr = vmcs_read32(GUEST_INTERRUPTIBILITY_INFO);
return !(guest_intr & (GUEST_INTR_STATE_NMI |
GUEST_INTR_STATE_MOV_SS |
GUEST_INTR_STATE_STI));
}
static int vmx_irq_enabled(struct kvm_vcpu *vcpu)
{
u32 guest_intr = vmcs_read32(GUEST_INTERRUPTIBILITY_INFO);
return (!(guest_intr & (GUEST_INTR_STATE_MOV_SS |
GUEST_INTR_STATE_STI)) &&
(vmcs_readl(GUEST_RFLAGS) & X86_EFLAGS_IF));
}
static void enable_intr_window(struct kvm_vcpu *vcpu)
{
if (vcpu->arch.nmi_pending)
@ -3159,11 +3155,13 @@ static void vmx_intr_assist(struct kvm_vcpu *vcpu)
{
update_tpr_threshold(vcpu);
vmx_update_window_states(vcpu);
if (cpu_has_virtual_nmis()) {
if (vcpu->arch.nmi_pending && !vcpu->arch.nmi_injected) {
if (vcpu->arch.interrupt.pending) {
enable_nmi_window(vcpu);
} else if (vmx_nmi_enabled(vcpu)) {
} else if (vcpu->arch.nmi_window_open) {
vcpu->arch.nmi_pending = false;
vcpu->arch.nmi_injected = true;
} else {
@ -3178,7 +3176,7 @@ static void vmx_intr_assist(struct kvm_vcpu *vcpu)
}
}
if (!vcpu->arch.interrupt.pending && kvm_cpu_has_interrupt(vcpu)) {
if (vmx_irq_enabled(vcpu))
if (vcpu->arch.interrupt_window_open)
kvm_queue_interrupt(vcpu, kvm_cpu_get_interrupt(vcpu));
else
enable_irq_window(vcpu);
@ -3339,9 +3337,7 @@ static void vmx_vcpu_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
if (vmx->rmode.irq.pending)
fixup_rmode_irq(vmx);
vcpu->arch.interrupt_window_open =
(vmcs_read32(GUEST_INTERRUPTIBILITY_INFO) &
(GUEST_INTR_STATE_STI | GUEST_INTR_STATE_MOV_SS)) == 0;
vmx_update_window_states(vcpu);
asm("mov %0, %%ds; mov %0, %%es" : : "r"(__USER_DS));
vmx->launched = 1;