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KVM: SVM: Wrap __svm_sev_es_vcpu_run() with #ifdef CONFIG_KVM_AMD_SEV

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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.

Reviewed-by: Tom Lendacky <thomas.lendacky@amd.com>
Link: https://lore.kernel.org/r/20240223204233.3337324-3-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
This commit is contained in:
Sean Christopherson 2024-02-23 12:42:27 -08:00
parent 19597a71a0
commit 7774c8f32e
1 changed files with 2 additions and 0 deletions
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2
arch/x86/kvm/svm/vmenter.S
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@ -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 */