linux-kernel - [PATCH 5/6] KVM: x86: de-underscorify __emulator_pio

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Date:   Wed,  8 Jun 2022 08:12:52 -0400
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Cc:     seanjc@...gle.com
Subject: [PATCH 5/6] KVM: x86: de-underscorify __emulator_pio_in

Now all callers except emulator_pio_in_emulated are using
__emulator_pio_in/complete_emulator_pio_in explicitly.
Move the "either copy the result or attempt PIO" logic in
emulator_pio_in_emulated, and rename __emulator_pio_in to
just emulator_pio_in.

Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>
---
 arch/x86/kvm/x86.c | 22 ++++++++--------------
 1 file changed, 8 insertions(+), 14 deletions(-)

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index aefcc71a7040..fd4382602f65 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -7456,7 +7456,7 @@ static int emulator_pio_in_out(struct kvm_vcpu *vcpu, int size,
 	return 0;
 }
 
-static int __emulator_pio_in(struct kvm_vcpu *vcpu, int size,
+static int emulator_pio_in(struct kvm_vcpu *vcpu, int size,
 			     unsigned short port, void *val, unsigned int count)
 {
 	int r = emulator_pio_in_out(vcpu, size, port, val, count, true);
@@ -7475,9 +7475,11 @@ static void complete_emulator_pio_in(struct kvm_vcpu *vcpu, void *val)
 	vcpu->arch.pio.count = 0;
 }
 
-static int emulator_pio_in(struct kvm_vcpu *vcpu, int size,
-			   unsigned short port, void *val, unsigned int count)
+static int emulator_pio_in_emulated(struct x86_emulate_ctxt *ctxt,
+				    int size, unsigned short port, void *val,
+				    unsigned int count)
 {
+	struct kvm_vcpu *vcpu = emul_to_vcpu(ctxt);
 	if (vcpu->arch.pio.count) {
 		/*
 		 * Complete a previous iteration that required userspace I/O.
@@ -7489,18 +7491,10 @@ static int emulator_pio_in(struct kvm_vcpu *vcpu, int size,
 		complete_emulator_pio_in(vcpu, val);
 		return 1;
 	} else {
-		return __emulator_pio_in(vcpu, size, port, val, count);
+		return emulator_pio_in(vcpu, size, port, val, count);
 	}
 }
 
-static int emulator_pio_in_emulated(struct x86_emulate_ctxt *ctxt,
-				    int size, unsigned short port, void *val,
-				    unsigned int count)
-{
-	return emulator_pio_in(emul_to_vcpu(ctxt), size, port, val, count);
-
-}
-
 static int emulator_pio_out(struct kvm_vcpu *vcpu, int size,
 			    unsigned short port, const void *val,
 			    unsigned int count)
@@ -8707,7 +8701,7 @@ 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;
@@ -13078,7 +13072,7 @@ static int kvm_sev_es_ins(struct kvm_vcpu *vcpu, unsigned int size,
 	for (;;) {
 		unsigned int count =
 			min_t(unsigned int, PAGE_SIZE / size, vcpu->arch.sev_pio_count);
-		if (!__emulator_pio_in(vcpu, size, port, vcpu->arch.sev_pio_data, count))
+		if (!emulator_pio_in(vcpu, size, port, vcpu->arch.sev_pio_data, count))
 			break;
 
 		/* Emulation done by the kernel.  */
-- 
2.31.1