KVM: x86: wean fast IN from emulator_pio_in

Use __emulator_pio_in() directly for fast PIO instead of bouncing through
emulator_pio_in() now that __emulator_pio_in() fills "val" when handling
in-kernel PIO.  vcpu->arch.pio.count is guaranteed to be '0', so this a
pure nop.

emulator_pio_in_emulated is now the last caller of emulator_pio_in.

No functional change intended.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 716ae5c..b824ffc 100644 (file)
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -8886,7 +8886,7 @@ static int kvm_fast_pio_in(struct kvm_vcpu *vcpu, int size,
        /* For size less than 4 we merge, else we zero extend */
        val = (size < 4) ? kvm_rax_read(vcpu) : 0;
 
-       ret = emulator_pio_in(vcpu, size, port, &val, 1);
+       ret = __emulator_pio_in(vcpu, size, port, &val, 1);
        if (ret) {
                kvm_rax_write(vcpu, val);
                return ret;