i386: Update SGX CPUID info according to hardware/KVM/user input

Expose SGX to the guest if and only if KVM is enabled and supports
virtualization of SGX.  While the majority of ENCLS can be emulated to
some degree, because SGX uses a hardware-based root of trust, the
attestation aspects of SGX cannot be emulated in software, i.e.
ultimately emulation will fail as software cannot generate a valid
quote/report.  The complexity of partially emulating SGX in Qemu far
outweighs the value added, e.g. an SGX specific simulator for userspace
applications can emulate SGX for development and testing purposes.

Note, access to the PROVISIONKEY is not yet advertised to the guest as
KVM blocks access to the PROVISIONKEY by default and requires userspace
to provide additional credentials (via ioctl()) to expose PROVISIONKEY.

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Yang Zhong <yang.zhong@intel.com>
Message-Id: <20210719112136.57018-13-yang.zhong@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

1 files changed, 77 insertions, 0 deletions

diff --git a/target/i386/cpu.c b/target/i386/cpu.c
index af6cd73eed..8a62986819 100644
--- a/target/i386/cpu.c
+++ b/target/i386/cpu.c
@@ -36,6 +36,7 @@
 #ifndef CONFIG_USER_ONLY
 #include "exec/address-spaces.h"
 #include "hw/boards.h"
+#include "hw/i386/sgx-epc.h"
 #endif
 
 #include "disas/capstone.h"
@@ -5334,6 +5335,25 @@ void cpu_x86_cpuid(CPUX86State *env, uint32_t index, uint32_t count,
                 *ecx |= CPUID_7_0_ECX_OSPKE;
             }
             *edx = env->features[FEAT_7_0_EDX]; /* Feature flags */
+
+            /*
+             * SGX cannot be emulated in software.  If hardware does not
+             * support enabling SGX and/or SGX flexible launch control,
+             * then we need to update the VM's CPUID values accordingly.
+             */
+            if ((*ebx & CPUID_7_0_EBX_SGX) &&
+                (!kvm_enabled() ||
+                 !(kvm_arch_get_supported_cpuid(cs->kvm_state, 0x7, 0, R_EBX) &
+                    CPUID_7_0_EBX_SGX))) {
+                *ebx &= ~CPUID_7_0_EBX_SGX;
+            }
+
+            if ((*ecx & CPUID_7_0_ECX_SGX_LC) &&
+                (!(*ebx & CPUID_7_0_EBX_SGX) || !kvm_enabled() ||
+                 !(kvm_arch_get_supported_cpuid(cs->kvm_state, 0x7, 0, R_ECX) &
+                    CPUID_7_0_ECX_SGX_LC))) {
+                *ecx &= ~CPUID_7_0_ECX_SGX_LC;
+            }
         } else if (count == 1) {
             *eax = env->features[FEAT_7_1_EAX];
             *ebx = 0;
@@ -5469,6 +5489,63 @@ void cpu_x86_cpuid(CPUX86State *env, uint32_t index, uint32_t count,
         }
         break;
     }
+    case 0x12:
+#ifndef CONFIG_USER_ONLY
+        if (!kvm_enabled() ||
+            !(env->features[FEAT_7_0_EBX] & CPUID_7_0_EBX_SGX)) {
+            *eax = *ebx = *ecx = *edx = 0;
+            break;
+        }
+
+        /*
+         * SGX sub-leafs CPUID.0x12.{0x2..N} enumerate EPC sections.  Retrieve
+         * the EPC properties, e.g. confidentiality and integrity, from the
+         * host's first EPC section, i.e. assume there is one EPC section or
+         * that all EPC sections have the same security properties.
+         */
+        if (count > 1) {
+            uint64_t epc_addr, epc_size;
+
+            if (sgx_epc_get_section(count - 2, &epc_addr, &epc_size)) {
+                *eax = *ebx = *ecx = *edx = 0;
+                break;
+            }
+            host_cpuid(index, 2, eax, ebx, ecx, edx);
+            *eax = (uint32_t)(epc_addr & 0xfffff000) | 0x1;
+            *ebx = (uint32_t)(epc_addr >> 32);
+            *ecx = (uint32_t)(epc_size & 0xfffff000) | (*ecx & 0xf);
+            *edx = (uint32_t)(epc_size >> 32);
+            break;
+        }
+
+        /*
+         * SGX sub-leafs CPUID.0x12.{0x0,0x1} are heavily dependent on hardware
+         * and KVM, i.e. QEMU cannot emulate features to override what KVM
+         * supports.  Features can be further restricted by userspace, but not
+         * made more permissive.
+         */
+        *eax = kvm_arch_get_supported_cpuid(cs->kvm_state, 0x12, count, R_EAX);
+        *ebx = kvm_arch_get_supported_cpuid(cs->kvm_state, 0x12, count, R_EBX);
+        *ecx = kvm_arch_get_supported_cpuid(cs->kvm_state, 0x12, count, R_ECX);
+        *edx = kvm_arch_get_supported_cpuid(cs->kvm_state, 0x12, count, R_EDX);
+
+        if (count == 0) {
+            *eax &= env->features[FEAT_SGX_12_0_EAX];
+            *ebx &= env->features[FEAT_SGX_12_0_EBX];
+        } else {
+            *eax &= env->features[FEAT_SGX_12_1_EAX];
+            *ebx &= 0; /* ebx reserve */
+            *ecx &= env->features[FEAT_XSAVE_COMP_LO];
+            *edx &= env->features[FEAT_XSAVE_COMP_HI];
+
+            /* FP and SSE are always allowed regardless of XSAVE/XCR0. */
+            *ecx |= XSTATE_FP_MASK | XSTATE_SSE_MASK;
+
+            /* Access to PROVISIONKEY requires additional credentials. */
+            *eax &= ~(1U << 4);
+        }
+#endif
+        break;
     case 0x14: {
         /* Intel Processor Trace Enumeration */
         *eax = 0;