Commit e93f36bc authored by Guillaume Thouvenin's avatar Guillaume Thouvenin Committed by Avi Kivity
Browse files

KVM: allow emulator to adjust rip for emulated pio instructions 



If we call the emulator we shouldn't call skip_emulated_instruction()
in the first place, since the emulator already computes the next rip
for us. Thus we move ->skip_emulated_instruction() out of
kvm_emulate_pio() and into handle_io() (and the svm equivalent). We
also replaced "return 0" by "break" in the "do_io:" case because now
the shadow register state needs to be committed. Otherwise eip will never
be updated.

Signed-off-by: default avatarGuillaume Thouvenin <guillaume.thouvenin@ext.bull.net>
Signed-off-by: default avatarAvi Kivity <avi@redhat.com>
parent c0d09828

arch/x86/kvm/svm.c

+1 −0
Original line number Diff line number Diff line
@@ -1115,6 +1115,7 @@ static int io_interception(struct vcpu_svm *svm, struct kvm_run *kvm_run) 
	rep = (io_info & SVM_IOIO_REP_MASK) != 0;

	down = (svm->vmcb->save.rflags & X86_EFLAGS_DF) != 0;



	skip_emulated_instruction(&svm->vcpu);

	return kvm_emulate_pio(&svm->vcpu, kvm_run, in, size, port);

}

arch/x86/kvm/vmx.c

+1 −0
Original line number Diff line number Diff line
@@ -2687,6 +2687,7 @@ static int handle_io(struct kvm_vcpu *vcpu, struct kvm_run *kvm_run) 
	rep = (exit_qualification & 32) != 0;

	port = exit_qualification >> 16;



	skip_emulated_instruction(vcpu);

	return kvm_emulate_pio(vcpu, kvm_run, in, size, port);

}

arch/x86/kvm/x86.c

+0 −2
Original line number Diff line number Diff line
@@ -2478,8 +2478,6 @@ int kvm_emulate_pio(struct kvm_vcpu *vcpu, struct kvm_run *run, int in, 
	val = kvm_register_read(vcpu, VCPU_REGS_RAX);

	memcpy(vcpu->arch.pio_data, &val, 4);



	kvm_x86_ops->skip_emulated_instruction(vcpu);



	pio_dev = vcpu_find_pio_dev(vcpu, port, size, !in);

	if (pio_dev) {

		kernel_pio(pio_dev, vcpu, vcpu->arch.pio_data);

arch/x86/kvm/x86_emulate.c

+1 −1
Original line number Diff line number Diff line
@@ -1772,7 +1772,7 @@ special_insn: 
			c->eip = saved_eip;

			goto cannot_emulate;

		}

		return 0;

		break;

	case 0xf4:              /* hlt */

		ctxt->vcpu->arch.halt_request = 1;

		break;

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