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From:   Paolo Bonzini <pbonzini@redhat.com>
To:     linux-kernel@vger.kernel.org, kvm@vger.kernel.org
Cc:     fwilhelm@google.com, seanjc@google.com, oupton@google.com,
        stable@vger.kernel.org
Subject: [PATCH 4/8] KVM: SEV-ES: clean up kvm_sev_es_ins/outs
Date:   Wed, 13 Oct 2021 12:56:12 -0400
Message-Id: <20211013165616.19846-5-pbonzini@redhat.com>
In-Reply-To: <20211013165616.19846-1-pbonzini@redhat.com>
References: <20211013165616.19846-1-pbonzini@redhat.com>
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Remove the data argument and pull setting vcpu->arch.sev_pio_data into
the caller; remove unnecessary clearing of vcpu->arch.pio.count when
emulation is done by the kernel.

No functional change intended.

Cc: stable@vger.kernel.org
Fixes: 7ed9abfe8e9f ("KVM: SVM: Support string IO operations for an SEV-ES guest")
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 arch/x86/kvm/x86.c | 31 +++++++++++++++----------------
 1 file changed, 15 insertions(+), 16 deletions(-)

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 218877e297e5..8880dc36a2b4 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -12382,34 +12382,32 @@ static int complete_sev_es_emulated_ins(struct kvm_vcpu *vcpu)
 }
 
 static int kvm_sev_es_outs(struct kvm_vcpu *vcpu, unsigned int size,
-			   unsigned int port, void *data,  unsigned int count)
+			   unsigned int port, unsigned int count)
 {
-	int ret;
+	int ret = emulator_pio_out(vcpu, size, port,
+				   vcpu->arch.sev_pio_data, count);
 
-	ret = emulator_pio_out_emulated(vcpu->arch.emulate_ctxt, size, port,
-					data, count);
-	if (ret)
+	if (ret) {
+		/* Emulation done by the kernel.  */
 		return ret;
+	}
 
 	vcpu->arch.pio.count = 0;
-
 	return 0;
 }
 
 static int kvm_sev_es_ins(struct kvm_vcpu *vcpu, unsigned int size,
-			  unsigned int port, void *data, unsigned int count)
+			  unsigned int port, unsigned int count)
 {
-	int ret;
+	int ret = emulator_pio_in(vcpu, size, port,
+				  vcpu->arch.sev_pio_data, count);
 
-	ret = emulator_pio_in_emulated(vcpu->arch.emulate_ctxt, size, port,
-				       data, count);
 	if (ret) {
-		vcpu->arch.pio.count = 0;
-	} else {
-		vcpu->arch.sev_pio_data = data;
-		vcpu->arch.complete_userspace_io = complete_sev_es_emulated_ins;
+		/* Emulation done by the kernel.  */
+		return ret;
 	}
 
+	vcpu->arch.complete_userspace_io = complete_sev_es_emulated_ins;
 	return 0;
 }
 
@@ -12417,8 +12415,9 @@ int kvm_sev_es_string_io(struct kvm_vcpu *vcpu, unsigned int size,
 			 unsigned int port, void *data,  unsigned int count,
 			 int in)
 {
-	return in ? kvm_sev_es_ins(vcpu, size, port, data, count)
-		  : kvm_sev_es_outs(vcpu, size, port, data, count);
+	vcpu->arch.sev_pio_data = data;
+	return in ? kvm_sev_es_ins(vcpu, size, port, count)
+		  : kvm_sev_es_outs(vcpu, size, port, count);
 }
 EXPORT_SYMBOL_GPL(kvm_sev_es_string_io);
 
-- 
2.27.0