linux-kernel - [PATCH 11/13] KVM: x86: wean fast IN from emulator_pio

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Date:   Fri, 22 Oct 2021 11:36:14 -0400
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Cc:     mlevitsk@...hat.com, seanjc@...gle.com
Subject: [PATCH 11/13] KVM: x86: wean fast IN from emulator_pio_in

Now that __emulator_pio_in already fills "val" for in-kernel PIO, it
is both simpler and clearer not to use emulator_pio_in.
Use the appropriate function in kvm_fast_pio_in and complete_fast_pio_in,
respectively __emulator_pio_in and complete_emulator_pio_in.

emulator_pio_in_emulated is now the last caller of emulator_pio_in.

No functional change intended.

Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>
---
 arch/x86/kvm/x86.c | 8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index e3d3c13fe803..42826087afd9 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -8061,11 +8061,7 @@ static int complete_fast_pio_in(struct kvm_vcpu *vcpu)
 	/* For size less than 4 we merge, else we zero extend */
 	val = (vcpu->arch.pio.size < 4) ? kvm_rax_read(vcpu) : 0;
 
-	/*
-	 * Since vcpu->arch.pio.count == 1 let emulator_pio_in perform
-	 * the copy and tracing
-	 */
-	emulator_pio_in(vcpu, vcpu->arch.pio.size, vcpu->arch.pio.port, &val, 1);
+	complete_emulator_pio_in(vcpu, &val);
 	kvm_rax_write(vcpu, val);
 
 	return kvm_skip_emulated_instruction(vcpu);
@@ -8080,7 +8076,7 @@ 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;
-- 
2.27.0