linux-kernel - [PATCH 6/6] KVM: SEV-ES: reuse advance_sev_es_emulated

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Date:   Wed,  8 Jun 2022 08:12:53 -0400
From:   Paolo Bonzini <pbonzini@...hat.com>
To:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org
Cc:     seanjc@...gle.com
Subject: [PATCH 6/6] KVM: SEV-ES: reuse advance_sev_es_emulated_ins for OUT too

complete_emulator_pio_in only has to be called by
complete_sev_es_emulated_ins now; therefore, all that the function does
now is adjust sev_pio_count and sev_pio_data.  Which is the same for
both IN and OUT.

No functional change intended.

Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>
---
 arch/x86/kvm/x86.c | 19 +++++++++----------
 1 file changed, 9 insertions(+), 10 deletions(-)

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index fd4382602f65..a3651aa74ed7 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -13007,6 +13007,12 @@ int kvm_sev_es_mmio_read(struct kvm_vcpu *vcpu, gpa_t gpa, unsigned int bytes,
 }
 EXPORT_SYMBOL_GPL(kvm_sev_es_mmio_read);
 
+static void advance_sev_es_emulated_pio(struct kvm_vcpu *vcpu, unsigned count, int size)
+{
+	vcpu->arch.sev_pio_count -= count;
+	vcpu->arch.sev_pio_data += count * size;
+}
+
 static int kvm_sev_es_outs(struct kvm_vcpu *vcpu, unsigned int size,
 			   unsigned int port);
 
@@ -13030,8 +13036,7 @@ static int kvm_sev_es_outs(struct kvm_vcpu *vcpu, unsigned int size,
 		int ret = emulator_pio_out(vcpu, size, port, vcpu->arch.sev_pio_data, count);
 
 		/* memcpy done already by emulator_pio_out.  */
-		vcpu->arch.sev_pio_count -= count;
-		vcpu->arch.sev_pio_data += count * vcpu->arch.pio.size;
+		advance_sev_es_emulated_pio(vcpu, count, size);
 		if (!ret)
 			break;
 
@@ -13047,12 +13052,6 @@ static int kvm_sev_es_outs(struct kvm_vcpu *vcpu, unsigned int size,
 static int kvm_sev_es_ins(struct kvm_vcpu *vcpu, unsigned int size,
 			  unsigned int port);
 
-static void advance_sev_es_emulated_ins(struct kvm_vcpu *vcpu, unsigned count, int size)
-{
-	vcpu->arch.sev_pio_count -= count;
-	vcpu->arch.sev_pio_data += count * size;
-}
-
 static int complete_sev_es_emulated_ins(struct kvm_vcpu *vcpu)
 {
 	unsigned count = vcpu->arch.pio.count;
@@ -13060,7 +13059,7 @@ static int complete_sev_es_emulated_ins(struct kvm_vcpu *vcpu)
 	int port = vcpu->arch.pio.port;
 
 	complete_emulator_pio_in(vcpu, vcpu->arch.sev_pio_data);
-	advance_sev_es_emulated_ins(vcpu, count, size);
+	advance_sev_es_emulated_pio(vcpu, count, size);
 	if (vcpu->arch.sev_pio_count)
 		return kvm_sev_es_ins(vcpu, size, port);
 	return 1;
@@ -13076,7 +13075,7 @@ static int kvm_sev_es_ins(struct kvm_vcpu *vcpu, unsigned int size,
 			break;
 
 		/* Emulation done by the kernel.  */
-		advance_sev_es_emulated_ins(vcpu, count, size);
+		advance_sev_es_emulated_pio(vcpu, count, size);
 		if (!vcpu->arch.sev_pio_count)
 			return 1;
 	}
-- 
2.31.1