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Commit 4ca7dd8c authored by Paolo Bonzini's avatar Paolo Bonzini
Browse files

KVM: x86: unify handling of interrupt window 



The interrupt window is currently checked twice, once in vmx.c/svm.c and
once in dm_request_for_irq_injection.  The only difference is the extra
check for kvm_arch_interrupt_allowed in dm_request_for_irq_injection,
and the different return value (EINTR/KVM_EXIT_INTR for vmx.c/svm.c vs.
0/KVM_EXIT_IRQ_WINDOW_OPEN for dm_request_for_irq_injection).

However, dm_request_for_irq_injection is basically dead code!  Revive it
by removing the checks in vmx.c and svm.c's vmexit handlers, and
fixing the returned values for the dm_request_for_irq_injection case.

Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
parent 35754c98

arch/x86/kvm/svm.c

+0 −13
Original line number Diff line number Diff line
@@ -3294,24 +3294,11 @@ static int msr_interception(struct vcpu_svm *svm) 


static int interrupt_window_interception(struct vcpu_svm *svm)

{

	struct kvm_run *kvm_run = svm->vcpu.run;



	kvm_make_request(KVM_REQ_EVENT, &svm->vcpu);

	svm_clear_vintr(svm);

	svm->vmcb->control.int_ctl &= ~V_IRQ_MASK;

	mark_dirty(svm->vmcb, VMCB_INTR);

	++svm->vcpu.stat.irq_window_exits;

	/*

	 * If the user space waits to inject interrupts, exit as soon as

	 * possible

	 */

	if (!lapic_in_kernel(&svm->vcpu) &&

	    kvm_run->request_interrupt_window &&

	    !kvm_cpu_has_interrupt(&svm->vcpu)) {

		kvm_run->exit_reason = KVM_EXIT_IRQ_WINDOW_OPEN;

		return 0;

	}



	return 1;

}

arch/x86/kvm/vmx.c

+0 −11
Original line number Diff line number Diff line
@@ -5524,17 +5524,6 @@ static int handle_interrupt_window(struct kvm_vcpu *vcpu) 
	kvm_make_request(KVM_REQ_EVENT, vcpu);



	++vcpu->stat.irq_window_exits;



	/*

	 * If the user space waits to inject interrupts, exit as soon as

	 * possible

	 */

	if (!lapic_in_kernel(vcpu) &&

	    vcpu->run->request_interrupt_window &&

	    !kvm_cpu_has_interrupt(vcpu)) {

		vcpu->run->exit_reason = KVM_EXIT_IRQ_WINDOW_OPEN;

		return 0;

	}

	return 1;

}

arch/x86/kvm/x86.c

+2 −2
Original line number Diff line number Diff line
@@ -6469,8 +6469,8 @@ static int vcpu_run(struct kvm_vcpu *vcpu) 
			kvm_inject_pending_timer_irqs(vcpu);



		if (dm_request_for_irq_injection(vcpu)) {

			r = -EINTR;

			vcpu->run->exit_reason = KVM_EXIT_INTR;

			r = 0;

			vcpu->run->exit_reason = KVM_EXIT_IRQ_WINDOW_OPEN;

			++vcpu->stat.request_irq_exits;

			break;

		}