diff options
| author | Sean Christopherson <seanjc@google.com> | 2023-08-24 18:36:19 -0700 |
|---|---|---|
| committer | Sean Christopherson <seanjc@google.com> | 2023-08-25 09:00:40 -0700 |
| commit | 80d0f521d59e08eeaa0bc5d624da139448fb99b8 (patch) | |
| tree | fd8edcc490ee545e81543888adb6ee087b167055 /arch/x86/kvm/svm/sev.c | |
| parent | cb49631ad111570f1bad37702c11c2ae07fa2e3c (diff) | |
KVM: SVM: Require nrips support for SEV guests (and beyond)
Disallow SEV (and beyond) if nrips is disabled via module param, as KVM
can't read guest memory to partially emulate and skip an instruction. All
CPUs that support SEV support NRIPS, i.e. this is purely stopping the user
from shooting themselves in the foot.
Cc: Tom Lendacky <thomas.lendacky@amd.com>
Link: https://lore.kernel.org/r/20230825013621.2845700-3-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
Diffstat (limited to 'arch/x86/kvm/svm/sev.c')
| -rw-r--r-- | arch/x86/kvm/svm/sev.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/x86/kvm/svm/sev.c b/arch/x86/kvm/svm/sev.c index 5585a3556179..85d1abdf7d7d 100644 --- a/arch/x86/kvm/svm/sev.c +++ b/arch/x86/kvm/svm/sev.c @@ -2185,7 +2185,7 @@ void __init sev_hardware_setup(void) bool sev_es_supported = false; bool sev_supported = false; - if (!sev_enabled || !npt_enabled) + if (!sev_enabled || !npt_enabled || !nrips) goto out; /* |