diff options
| -rw-r--r-- | arch/x86/kvm/cpuid.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/arch/x86/kvm/cpuid.c b/arch/x86/kvm/cpuid.c index 32fde9e80c28..499c86bd457e 100644 --- a/arch/x86/kvm/cpuid.c +++ b/arch/x86/kvm/cpuid.c @@ -955,6 +955,14 @@ void kvm_set_cpu_caps(void) if (!tdp_enabled || !boot_cpu_has(X86_FEATURE_OSPKE)) kvm_cpu_cap_clear(X86_FEATURE_PKU); + /* + * Shadow Stacks aren't implemented in the Shadow MMU. Shadow Stack + * accesses require "magic" Writable=0,Dirty=1 protection, which KVM + * doesn't know how to emulate or map. + */ + if (!tdp_enabled) + kvm_cpu_cap_clear(X86_FEATURE_SHSTK); + kvm_cpu_cap_init(CPUID_7_EDX, F(AVX512_4VNNIW), F(AVX512_4FMAPS), |