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Commit 1b6269db authored by Avi Kivity's avatar Avi Kivity
Browse files

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: default avatarAvi Kivity <avi@qumranet.com>
parent 7f2145ad

drivers/kvm/vmx.c

+9 −4
Original line number Diff line number Diff line
@@ -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,