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KVM: VMX: Handle NMIs before enabling interrupts and preemption 

This makes sure we handle NMI on the current cpu, and that we don't service
maskable interrupts before non-maskable ones.

Signed-off-by: Avi Kivity <avi@qumranet.com>
hifive-unleashed-5.1
Avi Kivity 2007-10-09 12:12:19 +02:00
parent 7f2145ad6f
commit 1b6269db3f
1 changed files with 9 additions and 4 deletions
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13
drivers/kvm/vmx.c
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@ -1760,10 +1760,8 @@ static int handle_exception(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
set_bit(irq / BITS_PER_LONG, &vcpu->irq_summary);
}
if ((intr_info & INTR_INFO_INTR_TYPE_MASK) == 0x200) { /* nmi */
asm ("int $2");
return 1;
}
if ((intr_info & INTR_INFO_INTR_TYPE_MASK) == 0x200) /* nmi */
return 1; /* already handled by vmx_vcpu_run() */
if (is_no_device(intr_info)) {
vmx_fpu_activate(vcpu);
@ -2196,6 +2194,7 @@ static void vmx_intr_assist(struct kvm_vcpu *vcpu)
static void vmx_vcpu_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
{
struct vcpu_vmx *vmx = to_vmx(vcpu);
u32 intr_info;
/*
* Loading guest fpu may have cleared host cr0.ts
@ -2322,6 +2321,12 @@ static void vmx_vcpu_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run)
asm ("mov %0, %%ds; mov %0, %%es" : : "r"(__USER_DS));
vmx->launched = 1;
intr_info = vmcs_read32(VM_EXIT_INTR_INFO);
/* We need to handle NMIs before interrupts are enabled */
if ((intr_info & INTR_INFO_INTR_TYPE_MASK) == 0x200) /* nmi */
asm("int $2");
}
static void vmx_inject_page_fault(struct kvm_vcpu *vcpu,