From: Sean Christopherson Date: Thu, 4 Apr 2024 12:13:11 +0000 (-0400) Subject: KVM: SVM: Invert handling of SEV and SEV_ES feature flags X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=1ff3c89032a8f241502a0ba8a95fe0133707a061;p=linux.git KVM: SVM: Invert handling of SEV and SEV_ES feature flags Leave SEV and SEV_ES '0' in kvm_cpu_caps by default, and instead set them in sev_set_cpu_caps() if SEV and SEV-ES support are fully enabled. Aside from the fact that sev_set_cpu_caps() is wildly misleading when it *clears* capabilities, this will allow compiling out sev.c without falsely advertising SEV/SEV-ES support in KVM_GET_SUPPORTED_CPUID. Signed-off-by: Sean Christopherson Reviewed-by: Michael Roth Signed-off-by: Paolo Bonzini Message-ID: <20240404121327.3107131-2-pbonzini@redhat.com> Signed-off-by: Paolo Bonzini --- diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c index bfc0bfcb2bc60..51bd2197feed1 100644 --- a/arch/x86/kvm/cpuid.c +++ b/arch/x86/kvm/cpuid.c @@ -771,7 +771,7 @@ void kvm_set_cpu_caps(void) kvm_cpu_cap_mask(CPUID_8000_000A_EDX, 0); kvm_cpu_cap_mask(CPUID_8000_001F_EAX, - 0 /* SME */ | F(SEV) | 0 /* VM_PAGE_FLUSH */ | F(SEV_ES) | + 0 /* SME */ | 0 /* SEV */ | 0 /* VM_PAGE_FLUSH */ | 0 /* SEV_ES */ | F(SME_COHERENT)); kvm_cpu_cap_mask(CPUID_8000_0021_EAX, diff --git a/arch/x86/kvm/svm/sev.c b/arch/x86/kvm/svm/sev.c index e5a4d9b0e79fd..382c745b8ba9b 100644 --- a/arch/x86/kvm/svm/sev.c +++ b/arch/x86/kvm/svm/sev.c @@ -2186,10 +2186,10 @@ void sev_vm_destroy(struct kvm *kvm) void __init sev_set_cpu_caps(void) { - if (!sev_enabled) - kvm_cpu_cap_clear(X86_FEATURE_SEV); - if (!sev_es_enabled) - kvm_cpu_cap_clear(X86_FEATURE_SEV_ES); + if (sev_enabled) + kvm_cpu_cap_set(X86_FEATURE_SEV); + if (sev_es_enabled) + kvm_cpu_cap_set(X86_FEATURE_SEV_ES); } void __init sev_hardware_setup(void)