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| author | Sean Christopherson <seanjc@google.com> | 2023-04-06 02:45:56 +0300 |
|---|---|---|
| committer | Sean Christopherson <seanjc@google.com> | 2023-06-02 20:12:03 +0300 |
| commit | c3a1e119a343a70a9f49689b8f18bb43f236d681 (patch) | |
| tree | e985d5e2b4ecec89a550925ef416b22ace6bc4d5 /arch/x86/kvm/vmx | |
| parent | 5e50082c8c21cd32ef21f523c149939668954ab6 (diff) | |
| download | linux-c3a1e119a343a70a9f49689b8f18bb43f236d681.tar.xz | |
KVM: VMX: Inject #GP, not #UD, if SGX2 ENCLS leafs are unsupported
Per Intel's SDM, unsupported ENCLS leafs result in a #GP, not a #UD.
SGX1 is a special snowflake as the SGX1 flag is used by the CPU as a
"soft" disable, e.g. if software disables machine check reporting, i.e.
having SGX but not SGX1 is effectively "SGX completely unsupported" and
and thus #UDs.
Fixes: 9798adbc04cf ("KVM: VMX: Frame in ENCLS handler for SGX virtualization")
Cc: Binbin Wu <binbin.wu@linux.intel.com>
Cc: Kai Huang <kai.huang@intel.com>
Tested-by: Kai Huang <kai.huang@intel.com>
Reviewed-by: Kai Huang <kai.huang@intel.com>
Link: https://lore.kernel.org/r/20230405234556.696927-3-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
Diffstat (limited to 'arch/x86/kvm/vmx')
| -rw-r--r-- | arch/x86/kvm/vmx/sgx.c | 15 |
1 files changed, 9 insertions, 6 deletions
diff --git a/arch/x86/kvm/vmx/sgx.c b/arch/x86/kvm/vmx/sgx.c index 137088a663ff..3e822e582497 100644 --- a/arch/x86/kvm/vmx/sgx.c +++ b/arch/x86/kvm/vmx/sgx.c @@ -357,11 +357,12 @@ static int handle_encls_einit(struct kvm_vcpu *vcpu) static inline bool encls_leaf_enabled_in_guest(struct kvm_vcpu *vcpu, u32 leaf) { - if (!enable_sgx || !guest_cpuid_has(vcpu, X86_FEATURE_SGX)) - return false; - + /* + * ENCLS generates a #UD if SGX1 isn't supported, i.e. this point will + * be reached if and only if the SGX1 leafs are enabled. + */ if (leaf >= ECREATE && leaf <= ETRACK) - return guest_cpuid_has(vcpu, X86_FEATURE_SGX1); + return true; if (leaf >= EAUG && leaf <= EMODT) return guest_cpuid_has(vcpu, X86_FEATURE_SGX2); @@ -380,9 +381,11 @@ int handle_encls(struct kvm_vcpu *vcpu) { u32 leaf = (u32)kvm_rax_read(vcpu); - if (!encls_leaf_enabled_in_guest(vcpu, leaf)) { + if (!enable_sgx || !guest_cpuid_has(vcpu, X86_FEATURE_SGX) || + !guest_cpuid_has(vcpu, X86_FEATURE_SGX1)) { kvm_queue_exception(vcpu, UD_VECTOR); - } else if (!sgx_enabled_in_guest_bios(vcpu) || !is_paging(vcpu)) { + } else if (!encls_leaf_enabled_in_guest(vcpu, leaf) || + !sgx_enabled_in_guest_bios(vcpu) || !is_paging(vcpu)) { kvm_inject_gp(vcpu, 0); } else { if (leaf == ECREATE) |