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KVM: SVM: avoid frequency indirect calls

Message ID 20250306075425.66693-1-flyingpeng@tencent.com (mailing list archive)
State New
Headers show
Series KVM: SVM: avoid frequency indirect calls | expand

Commit Message

Hao Peng March 6, 2025, 7:54 a.m. UTC 
From: Peng Hao <flyingpeng@tencent.com>

When retpoline is enabled, indirect function calls introduce additional
performance overhead. Avoid frequent indirect calls to VMGEXIT when SEV
is enabled.

Signed-off-by: Peng Hao <flyingpeng@tencent.com>
---
 arch/x86/kvm/svm/svm.c | 4 ++++
 1 file changed, 4 insertions(+)
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Patch

diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c
index a713c803a3a3..79d031fe2253 100644
--- a/arch/x86/kvm/svm/svm.c
+++ b/arch/x86/kvm/svm/svm.c
@@ -3508,6 +3508,10 @@  int svm_invoke_exit_handler(struct kvm_vcpu *vcpu, u64 exit_code)
 		return kvm_emulate_halt(vcpu);
 	else if (exit_code == SVM_EXIT_NPF)
 		return npf_interception(vcpu);
+#ifdef CONFIG_KVM_AMD_SEV
+	else if (exit_code == SVM_EXIT_VMGEXIT)
+		return sev_handle_vmgexit(vcpu);
+#endif
 #endif
 	return svm_exit_handlers[exit_code](vcpu);
 }