linux-kernel - [PATCH v3 10/26] KVM: nSVM: Call nested_svm_merge_msrpm() from enter_svm_guest

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Message-ID: <20251215192722.3654335-12-yosry.ahmed@linux.dev>
Date: Mon, 15 Dec 2025 19:27:05 +0000
From: Yosry Ahmed <yosry.ahmed@...ux.dev>
To: Paolo Bonzini <pbonzini@...hat.com>,
	Sean Christopherson <seanjc@...gle.com>
Cc: kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Yosry Ahmed <yosry.ahmed@...ux.dev>,
	stable@...r.kernel.org
Subject: [PATCH v3 10/26] KVM: nSVM: Call nested_svm_merge_msrpm() from enter_svm_guest_mode()

In preparation for unifying the VMRUN failure code paths, move calling
nested_svm_merge_msrpm() into enter_svm_guest_mode() next to the
nested_svm_load_cr3() call (the other failure path in
enter_svm_guest_mode()).

Adding more uses of the from_vmrun parameter is not pretty, but it is
plumbed all the way to nested_svm_load_cr3() so it's not going away soon
anyway.

No functional change intended.

Cc: stable@...r.kernel.org
Signed-off-by: Yosry Ahmed <yosry.ahmed@...ux.dev>
---
 arch/x86/kvm/svm/nested.c | 31 ++++++++++++++++---------------
 1 file changed, 16 insertions(+), 15 deletions(-)

diff --git a/arch/x86/kvm/svm/nested.c b/arch/x86/kvm/svm/nested.c
index f46e97008492..2ee9d8bef5ba 100644
--- a/arch/x86/kvm/svm/nested.c
+++ b/arch/x86/kvm/svm/nested.c
@@ -911,6 +911,12 @@ int enter_svm_guest_mode(struct kvm_vcpu *vcpu, u64 vmcb12_gpa,
 	if (ret)
 		return ret;
 
+	if (from_vmrun) {
+		ret = nested_svm_merge_msrpm(vcpu);
+		if (ret)
+			return ret;
+	}
+
 	if (!from_vmrun)
 		kvm_make_request(KVM_REQ_GET_NESTED_STATE_PAGES, vcpu);
 
@@ -990,23 +996,18 @@ int nested_svm_vmrun(struct kvm_vcpu *vcpu)
 
 	svm->nested.nested_run_pending = 1;
 
-	if (enter_svm_guest_mode(vcpu, vmcb12_gpa, vmcb12, true))
-		goto out_exit_err;
-
-	if (!nested_svm_merge_msrpm(vcpu))
-		goto out;
-
-out_exit_err:
-	svm->nested.nested_run_pending = 0;
-	svm->nmi_l1_to_l2 = false;
-	svm->soft_int_injected = false;
+	if (enter_svm_guest_mode(vcpu, vmcb12_gpa, vmcb12, true)) {
+		svm->nested.nested_run_pending = 0;
+		svm->nmi_l1_to_l2 = false;
+		svm->soft_int_injected = false;
 
-	svm->vmcb->control.exit_code    = SVM_EXIT_ERR;
-	svm->vmcb->control.exit_code_hi = -1u;
-	svm->vmcb->control.exit_info_1  = 0;
-	svm->vmcb->control.exit_info_2  = 0;
+		svm->vmcb->control.exit_code    = SVM_EXIT_ERR;
+		svm->vmcb->control.exit_code_hi = -1u;
+		svm->vmcb->control.exit_info_1  = 0;
+		svm->vmcb->control.exit_info_2  = 0;
 
-	nested_svm_vmexit(svm);
+		nested_svm_vmexit(svm);
+	}
 
 out:
 	kvm_vcpu_unmap(vcpu, &map);
-- 
2.52.0.239.gd5f0c6e74e-goog