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KVM: x86: leave vcpu->arch.pio.count alone in emulator_pio_in_out

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Currently emulator_pio_in clears vcpu->arch.pio.count twice if
emulator_pio_in_out performs kernel PIO.  Move the clear into
emulator_pio_out where it is actually necessary.

No functional change intended.

Cc: stable@vger.kernel.org
Fixes: 7ed9abfe8e ("KVM: SVM: Support string IO operations for an SEV-ES guest")
Reviewed-by: Maxim Levitsky <mlevitsk@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2021-10-13 12:29:42 -04:00
parent b5998402e3
commit 0d33b1baeb
1 changed files with 9 additions and 4 deletions
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13
arch/x86/kvm/x86.c
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@ -6914,10 +6914,8 @@ static int emulator_pio_in_out(struct kvm_vcpu *vcpu, int size,
vcpu->arch.pio.count = count;
vcpu->arch.pio.size = size;
if (!kernel_pio(vcpu, vcpu->arch.pio_data)) {
vcpu->arch.pio.count = 0;
if (!kernel_pio(vcpu, vcpu->arch.pio_data))
return 1;
}
vcpu->run->exit_reason = KVM_EXIT_IO;
vcpu->run->io.direction = in ? KVM_EXIT_IO_IN : KVM_EXIT_IO_OUT;
@ -6963,9 +6961,16 @@ static int emulator_pio_out(struct kvm_vcpu *vcpu, int size,
unsigned short port, const void *val,
unsigned int count)
{
int ret;
memcpy(vcpu->arch.pio_data, val, size * count);
trace_kvm_pio(KVM_PIO_OUT, port, size, count, vcpu->arch.pio_data);
return emulator_pio_in_out(vcpu, size, port, (void *)val, count, false);
ret = emulator_pio_in_out(vcpu, size, port, (void *)val, count, false);
if (ret)
vcpu->arch.pio.count = 0;
return ret;
}
static int emulator_pio_out_emulated(struct x86_emulate_ctxt *ctxt,