[PATCH 2/8] KVM: SVM: Wrap __svm_sev_es_vcpu_run() with #ifdef CONFIG_KVM_AMD_SEV

From: Sean Christopherson
Date: Fri Feb 23 2024 - 15:45:29 EST


Compile (and link) __svm_sev_es_vcpu_run() if and only if SEV support is
actually enabled. This will allow dropping non-existent 32-bit "support"
from __svm_sev_es_vcpu_run() without causing undue confusion.

Intentionally don't provide a stub (but keep the declaration), as any sane
compiler, even with things like KASAN enabled, should eliminate the call
to __svm_sev_es_vcpu_run() since sev_es_guest() unconditionally returns
"false" if CONFIG_KVM_AMD_SEV=n.

Signed-off-by: Sean Christopherson <seanjc@xxxxxxxxxx>
---
arch/x86/kvm/svm/vmenter.S | 2 ++
1 file changed, 2 insertions(+)

diff --git a/arch/x86/kvm/svm/vmenter.S b/arch/x86/kvm/svm/vmenter.S
index ee5d5a30da88..7ee363d7517c 100644
--- a/arch/x86/kvm/svm/vmenter.S
+++ b/arch/x86/kvm/svm/vmenter.S
@@ -291,6 +291,7 @@ SYM_FUNC_START(__svm_vcpu_run)

SYM_FUNC_END(__svm_vcpu_run)

+#ifdef CONFIG_KVM_AMD_SEV
/**
* __svm_sev_es_vcpu_run - Run a SEV-ES vCPU via a transition to SVM guest mode
* @svm: struct vcpu_svm *
@@ -389,3 +390,4 @@ SYM_FUNC_START(__svm_sev_es_vcpu_run)
_ASM_EXTABLE(1b, 3b)

SYM_FUNC_END(__svm_sev_es_vcpu_run)
+#endif /* CONFIG_KVM_AMD_SEV */
--
2.44.0.rc0.258.g7320e95886-goog