linux-kernel - [PATCH 4/9] KVM: SVM: Open code handling of unexpected exits in svm_invoke_exit

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20251113225621.1688428-5-seanjc@google.com>
Date: Thu, 13 Nov 2025 14:56:16 -0800
From: Sean Christopherson <seanjc@...gle.com>
To: Sean Christopherson <seanjc@...gle.com>, Paolo Bonzini <pbonzini@...hat.com>, 
	Vitaly Kuznetsov <vkuznets@...hat.com>, "K. Y. Srinivasan" <kys@...rosoft.com>, 
	Haiyang Zhang <haiyangz@...rosoft.com>, Wei Liu <wei.liu@...nel.org>, 
	Dexuan Cui <decui@...rosoft.com>
Cc: kvm@...r.kernel.org, linux-hyperv@...r.kernel.org, 
	linux-kernel@...r.kernel.org, Jim Mattson <jmattson@...gle.com>, 
	Yosry Ahmed <yosry.ahmed@...ux.dev>
Subject: [PATCH 4/9] KVM: SVM: Open code handling of unexpected exits in svm_invoke_exit_handler()

Fold svm_check_exit_valid() and svm_handle_invalid_exit() into their sole
caller, svm_invoke_exit_handler(), as having tiny single-use helpers makes
the code unncessarily difficult to follow.  This will also allow for
additional cleanups in svm_invoke_exit_handler().

No functional change intended.

Suggested-by: Yosry Ahmed <yosry.ahmed@...ux.dev>
Signed-off-by: Sean Christopherson <seanjc@...gle.com>
---
 arch/x86/kvm/svm/svm.c | 25 ++++++++++---------------
 1 file changed, 10 insertions(+), 15 deletions(-)

diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c
index 52b759408853..638a67ef0c37 100644
--- a/arch/x86/kvm/svm/svm.c
+++ b/arch/x86/kvm/svm/svm.c
@@ -3433,23 +3433,13 @@ static void dump_vmcb(struct kvm_vcpu *vcpu)
 		sev_free_decrypted_vmsa(vcpu, save);
 }
 
-static bool svm_check_exit_valid(u64 exit_code)
-{
-	return (exit_code < ARRAY_SIZE(svm_exit_handlers) &&
-		svm_exit_handlers[exit_code]);
-}
-
-static int svm_handle_invalid_exit(struct kvm_vcpu *vcpu, u64 exit_code)
-{
-	dump_vmcb(vcpu);
-	kvm_prepare_unexpected_reason_exit(vcpu, exit_code);
-	return 0;
-}
-
 int svm_invoke_exit_handler(struct kvm_vcpu *vcpu, u64 exit_code)
 {
-	if (!svm_check_exit_valid(exit_code))
-		return svm_handle_invalid_exit(vcpu, exit_code);
+	if (exit_code >= ARRAY_SIZE(svm_exit_handlers))
+		goto unexpected_vmexit;
+
+	if (!svm_exit_handlers[exit_code])
+		goto unexpected_vmexit;
 
 #ifdef CONFIG_MITIGATION_RETPOLINE
 	if (exit_code == SVM_EXIT_MSR)
@@ -3468,6 +3458,11 @@ int svm_invoke_exit_handler(struct kvm_vcpu *vcpu, u64 exit_code)
 #endif
 #endif
 	return svm_exit_handlers[exit_code](vcpu);
+
+unexpected_vmexit:
+	dump_vmcb(vcpu);
+	kvm_prepare_unexpected_reason_exit(vcpu, exit_code);
+	return 0;
 }
 
 static void svm_get_exit_info(struct kvm_vcpu *vcpu, u32 *reason,
-- 
2.52.0.rc1.455.g30608eb744-goog