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Commit 92bf9748 authored by Gleb Natapov's avatar Gleb Natapov Committed by Avi Kivity
Browse files

KVM: small kvm_arch_vcpu_ioctl_run() cleanup. 



Unify all conditions that get us back into emulator after returning from
userspace.

Signed-off-by: default avatarGleb Natapov <gleb@redhat.com>
Signed-off-by: default avatarMarcelo Tosatti <mtosatti@redhat.com>
parent 7b262e90

arch/x86/kvm/x86.c

+6 −26
Original line number Diff line number Diff line
@@ -4542,33 +4542,13 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run) 
	if (!irqchip_in_kernel(vcpu->kvm))

		kvm_set_cr8(vcpu, kvm_run->cr8);



	if (vcpu->arch.pio.count) {

		vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);

		r = emulate_instruction(vcpu, 0, 0, EMULTYPE_NO_DECODE);

		srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx);

		if (r == EMULATE_DO_MMIO) {

			r = 0;

			goto out;

		}

	}

	if (vcpu->arch.pio.count || vcpu->mmio_needed ||

	    vcpu->arch.emulate_ctxt.restart) {

		if (vcpu->mmio_needed) {

			memcpy(vcpu->mmio_data, kvm_run->mmio.data, 8);

			vcpu->mmio_read_completed = 1;

			vcpu->mmio_needed = 0;



		vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);

		r = emulate_instruction(vcpu, vcpu->arch.mmio_fault_cr2, 0,

					EMULTYPE_NO_DECODE);

		srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx);

		if (r == EMULATE_DO_MMIO) {

			/*

			 * Read-modify-write.  Back to userspace.

			 */

			r = 0;

			goto out;

		}

		}

	if (vcpu->arch.emulate_ctxt.restart) {

		vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);

		r = emulate_instruction(vcpu, 0, 0, EMULTYPE_NO_DECODE);

		srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx);