Refuse to virtualize FRED if FRED consistency checks fail.
Suggested-by: Chao Gao chao.gao@intel.com Signed-off-by: Xin Li xin3.li@intel.com --- arch/x86/kvm/vmx/capabilities.h | 10 ++++++++++ arch/x86/kvm/vmx/vmx.c | 2 ++ 2 files changed, 12 insertions(+)
diff --git a/arch/x86/kvm/vmx/capabilities.h b/arch/x86/kvm/vmx/capabilities.h index e8f3ad0f79ee..73bf6618c425 100644 --- a/arch/x86/kvm/vmx/capabilities.h +++ b/arch/x86/kvm/vmx/capabilities.h @@ -400,6 +400,16 @@ static inline bool vmx_pebs_supported(void) return boot_cpu_has(X86_FEATURE_PEBS) && kvm_pmu_cap.pebs_ept; }
+static inline bool cpu_has_vmx_fred(void) +{ + return boot_cpu_has(X86_FEATURE_FRED) && + (vmcs_config.basic & VMX_BASIC_NESTED_EXCEPTION) && + (vmcs_config.vmexit_ctrl & VM_EXIT_ACTIVATE_SECONDARY_CONTROLS) && + (vmcs_config.secondary_vmexit_ctrl & SECONDARY_VM_EXIT_SAVE_IA32_FRED) && + (vmcs_config.secondary_vmexit_ctrl & SECONDARY_VM_EXIT_LOAD_IA32_FRED) && + (vmcs_config.vmentry_ctrl & VM_ENTRY_LOAD_IA32_FRED); +} + static inline bool cpu_has_notify_vmexit(void) { return vmcs_config.cpu_based_2nd_exec_ctrl & diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c index 1f265d526daf..a484b9ac2400 100644 --- a/arch/x86/kvm/vmx/vmx.c +++ b/arch/x86/kvm/vmx/vmx.c @@ -8113,6 +8113,8 @@ static __init void vmx_set_cpu_caps(void) kvm_cpu_cap_check_and_set(X86_FEATURE_DS); kvm_cpu_cap_check_and_set(X86_FEATURE_DTES64); } + if (!cpu_has_vmx_fred()) + kvm_cpu_cap_clear(X86_FEATURE_FRED);
if (!enable_pmu) kvm_cpu_cap_clear(X86_FEATURE_PDCM);