linux-kernel - [PATCH 4/9] KVM: nSVM: Add VMLOAD/VMSAVE helper to deduplicate code

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Message-Id: <20210205005750.3841462-5-seanjc@google.com>
Date:   Thu,  4 Feb 2021 16:57:45 -0800
From:   Sean Christopherson <seanjc@...gle.com>
To:     Paolo Bonzini <pbonzini@...hat.com>,
        Jiri Kosina <trivial@...nel.org>
Cc:     Sean Christopherson <seanjc@...gle.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 4/9] KVM: nSVM: Add VMLOAD/VMSAVE helper to deduplicate code

Add another helper layer for VMLOAD+VMSAVE, the code is identical except
for the one line that determines which VMCB is the source and which is
the destination.

No functional change intended.

Signed-off-by: Sean Christopherson <seanjc@...gle.com>
---
 arch/x86/kvm/svm/svm.c | 79 ++++++++++++++++++------------------------
 1 file changed, 33 insertions(+), 46 deletions(-)

diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c
index 0139cb259093..d8c3bb33e59c 100644
--- a/arch/x86/kvm/svm/svm.c
+++ b/arch/x86/kvm/svm/svm.c
@@ -2131,58 +2131,45 @@ static int vmmcall_interception(struct kvm_vcpu *vcpu)
 	return kvm_emulate_hypercall(vcpu);
 }
 
+static int vmload_vmsave_interception(struct kvm_vcpu *vcpu, bool vmload)
+{
+	struct vcpu_svm *svm = to_svm(vcpu);
+	struct vmcb *vmcb12;
+	struct kvm_host_map map;
+	int ret;
+
+	if (nested_svm_check_permissions(vcpu))
+		return 1;
+
+	ret = kvm_vcpu_map(vcpu, gpa_to_gfn(svm->vmcb->save.rax), &map);
+	if (ret) {
+		if (ret == -EINVAL)
+			kvm_inject_gp(vcpu, 0);
+		return 1;
+	}
+
+	vmcb12 = map.hva;
+
+	ret = kvm_skip_emulated_instruction(vcpu);
+
+	if (vmload)
+		nested_svm_vmloadsave(vmcb12, svm->vmcb);
+	else
+		nested_svm_vmloadsave(svm->vmcb, vmcb12);
+
+	kvm_vcpu_unmap(vcpu, &map, true);
+
+	return ret;
+}
+
 static int vmload_interception(struct kvm_vcpu *vcpu)
 {
-	struct vcpu_svm *svm = to_svm(vcpu);
-	struct vmcb *vmcb12;
-	struct kvm_host_map map;
-	int ret;
-
-	if (nested_svm_check_permissions(vcpu))
-		return 1;
-
-	ret = kvm_vcpu_map(vcpu, gpa_to_gfn(svm->vmcb->save.rax), &map);
-	if (ret) {
-		if (ret == -EINVAL)
-			kvm_inject_gp(vcpu, 0);
-		return 1;
-	}
-
-	vmcb12 = map.hva;
-
-	ret = kvm_skip_emulated_instruction(vcpu);
-
-	nested_svm_vmloadsave(vmcb12, svm->vmcb);
-	kvm_vcpu_unmap(vcpu, &map, true);
-
-	return ret;
+	return vmload_vmsave_interception(vcpu, true);
 }
 
 static int vmsave_interception(struct kvm_vcpu *vcpu)
 {
-	struct vcpu_svm *svm = to_svm(vcpu);
-	struct vmcb *vmcb12;
-	struct kvm_host_map map;
-	int ret;
-
-	if (nested_svm_check_permissions(vcpu))
-		return 1;
-
-	ret = kvm_vcpu_map(vcpu, gpa_to_gfn(svm->vmcb->save.rax), &map);
-	if (ret) {
-		if (ret == -EINVAL)
-			kvm_inject_gp(vcpu, 0);
-		return 1;
-	}
-
-	vmcb12 = map.hva;
-
-	ret = kvm_skip_emulated_instruction(vcpu);
-
-	nested_svm_vmloadsave(svm->vmcb, vmcb12);
-	kvm_vcpu_unmap(vcpu, &map, true);
-
-	return ret;
+	return vmload_vmsave_interception(vcpu, false);
 }
 
 static int vmrun_interception(struct kvm_vcpu *vcpu)
-- 
2.30.0.365.g02bc693789-goog