[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[PATCH 10/32] i386: Add get/set/migrate support for SGX_LEPUBKEYHASH MSR
From: |
Yang Zhong |
Subject: |
[PATCH 10/32] i386: Add get/set/migrate support for SGX_LEPUBKEYHASH MSRs |
Date: |
Mon, 19 Apr 2021 18:01:34 +0800 |
From: Sean Christopherson <sean.j.christopherson@intel.com>
On real hardware, on systems that supports SGX Launch Control, those
MSRs are initialized to digest of Intel's signing key; on systems that
don't support SGX Launch Control, those MSRs are not available but
hardware always uses digest of Intel's signing key in EINIT.
KVM advertises SGX LC via CPUID if and only if the MSRs are writable.
Unconditionally initialize those MSRs to digest of Intel's signing key
when CPU is realized and reset to reflect the fact. This avoids
potential bug in case kvm_arch_put_registers() is called before
kvm_arch_get_registers() is called, in which case guest's virtual
SGX_LEPUBKEYHASH MSRs will be set to 0, although KVM initializes those
to digest of Intel's signing key by default, since KVM allows those MSRs
to be updated by Qemu to support live migration.
Save/restore the SGX Launch Enclave Public Key Hash MSRs if SGX Launch
Control (LC) is exposed to the guest. Likewise, migrate the MSRs if they
are writable by the guest.
Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Kai Huang <kai.huang@intel.com>
Signed-off-by: Yang Zhong <yang.zhong@intel.com>
---
target/i386/cpu.c | 17 ++++++++++++++++-
target/i386/cpu.h | 1 +
target/i386/kvm/kvm.c | 22 ++++++++++++++++++++++
target/i386/machine.c | 20 ++++++++++++++++++++
4 files changed, 59 insertions(+), 1 deletion(-)
diff --git a/target/i386/cpu.c b/target/i386/cpu.c
index ec12e12a33..43e6fdf162 100644
--- a/target/i386/cpu.c
+++ b/target/i386/cpu.c
@@ -6179,6 +6179,16 @@ void cpu_x86_cpuid(CPUX86State *env, uint32_t index,
uint32_t count,
}
}
+#ifndef CONFIG_USER_ONLY
+static void x86_cpu_set_sgxlepubkeyhash(CPUX86State *env)
+{
+ env->msr_ia32_sgxlepubkeyhash[0] = 0xa6053e051270b7acULL;
+ env->msr_ia32_sgxlepubkeyhash[1] = 0x6cfbe8ba8b3b413dULL;
+ env->msr_ia32_sgxlepubkeyhash[2] = 0xc4916d99f2b3735dULL;
+ env->msr_ia32_sgxlepubkeyhash[3] = 0xd4f8c05909f9bb3bULL;
+}
+#endif
+
static void x86_cpu_reset(DeviceState *dev)
{
CPUState *s = CPU(dev);
@@ -6310,6 +6320,8 @@ static void x86_cpu_reset(DeviceState *dev)
if (kvm_enabled()) {
kvm_arch_reset_vcpu(cpu);
}
+
+ x86_cpu_set_sgxlepubkeyhash(env);
#endif
}
@@ -6922,6 +6934,10 @@ static void x86_cpu_realizefn(DeviceState *dev, Error
**errp)
/* Process Hyper-V enlightenments */
x86_cpu_hyperv_realize(cpu);
+#ifndef CONFIG_USER_ONLY
+ x86_cpu_set_sgxlepubkeyhash(env);
+#endif
+
cpu_exec_realizefn(cs, &local_err);
if (local_err != NULL) {
error_propagate(errp, local_err);
@@ -7559,7 +7575,6 @@ static const TypeInfo x86_cpu_type_info = {
.class_init = x86_cpu_common_class_init,
};
-
/* "base" CPU model, used by query-cpu-model-expansion */
static void x86_cpu_base_class_init(ObjectClass *oc, void *data)
{
diff --git a/target/i386/cpu.h b/target/i386/cpu.h
index 51b5968c88..dc191d619e 100644
--- a/target/i386/cpu.h
+++ b/target/i386/cpu.h
@@ -1500,6 +1500,7 @@ typedef struct CPUX86State {
uint64_t mcg_status;
uint64_t msr_ia32_misc_enable;
uint64_t msr_ia32_feature_control;
+ uint64_t msr_ia32_sgxlepubkeyhash[4];
uint64_t msr_fixed_ctr_ctrl;
uint64_t msr_global_ctrl;
diff --git a/target/i386/kvm/kvm.c b/target/i386/kvm/kvm.c
index 7fe9f52710..4463d638c4 100644
--- a/target/i386/kvm/kvm.c
+++ b/target/i386/kvm/kvm.c
@@ -3030,6 +3030,17 @@ static int kvm_put_msrs(X86CPU *cpu, int level)
}
}
+ if (env->features[FEAT_7_0_ECX] & CPUID_7_0_ECX_SGX_LC) {
+ kvm_msr_entry_add(cpu, MSR_IA32_SGXLEPUBKEYHASH0,
+ env->msr_ia32_sgxlepubkeyhash[0]);
+ kvm_msr_entry_add(cpu, MSR_IA32_SGXLEPUBKEYHASH1,
+ env->msr_ia32_sgxlepubkeyhash[1]);
+ kvm_msr_entry_add(cpu, MSR_IA32_SGXLEPUBKEYHASH2,
+ env->msr_ia32_sgxlepubkeyhash[2]);
+ kvm_msr_entry_add(cpu, MSR_IA32_SGXLEPUBKEYHASH3,
+ env->msr_ia32_sgxlepubkeyhash[3]);
+ }
+
/* Note: MSR_IA32_FEATURE_CONTROL is written separately, see
* kvm_put_msr_feature_control. */
}
@@ -3369,6 +3380,13 @@ static int kvm_get_msrs(X86CPU *cpu)
}
}
+ if (env->features[FEAT_7_0_ECX] & CPUID_7_0_ECX_SGX_LC) {
+ kvm_msr_entry_add(cpu, MSR_IA32_SGXLEPUBKEYHASH0, 0);
+ kvm_msr_entry_add(cpu, MSR_IA32_SGXLEPUBKEYHASH1, 0);
+ kvm_msr_entry_add(cpu, MSR_IA32_SGXLEPUBKEYHASH2, 0);
+ kvm_msr_entry_add(cpu, MSR_IA32_SGXLEPUBKEYHASH3, 0);
+ }
+
ret = kvm_vcpu_ioctl(CPU(cpu), KVM_GET_MSRS, cpu->kvm_msr_buf);
if (ret < 0) {
return ret;
@@ -3658,6 +3676,10 @@ static int kvm_get_msrs(X86CPU *cpu)
case MSR_IA32_RTIT_ADDR0_A ... MSR_IA32_RTIT_ADDR3_B:
env->msr_rtit_addrs[index - MSR_IA32_RTIT_ADDR0_A] = msrs[i].data;
break;
+ case MSR_IA32_SGXLEPUBKEYHASH0 ... MSR_IA32_SGXLEPUBKEYHASH3:
+ env->msr_ia32_sgxlepubkeyhash[index - MSR_IA32_SGXLEPUBKEYHASH0] =
+ msrs[i].data;
+ break;
}
}
diff --git a/target/i386/machine.c b/target/i386/machine.c
index 137604ddb8..17efd94463 100644
--- a/target/i386/machine.c
+++ b/target/i386/machine.c
@@ -1396,6 +1396,25 @@ static const VMStateDescription vmstate_msr_tsx_ctrl = {
}
};
+static bool intel_sgx_msrs_needed(void *opaque)
+{
+ X86CPU *cpu = opaque;
+ CPUX86State *env = &cpu->env;
+
+ return !!(env->features[FEAT_7_0_ECX] & CPUID_7_0_ECX_SGX_LC);
+}
+
+static const VMStateDescription vmstate_msr_intel_sgx = {
+ .name = "cpu/intel_sgx",
+ .version_id = 1,
+ .minimum_version_id = 1,
+ .needed = intel_sgx_msrs_needed,
+ .fields = (VMStateField[]) {
+ VMSTATE_UINT64_ARRAY(env.msr_ia32_sgxlepubkeyhash, X86CPU, 4),
+ VMSTATE_END_OF_LIST()
+ }
+};
+
VMStateDescription vmstate_x86_cpu = {
.name = "cpu",
.version_id = 12,
@@ -1531,6 +1550,7 @@ VMStateDescription vmstate_x86_cpu = {
&vmstate_nested_state,
#endif
&vmstate_msr_tsx_ctrl,
+ &vmstate_msr_intel_sgx,
NULL
}
};
--
2.29.2.334.gfaefdd61ec
- [PATCH 00/32] Qemu SGX virtualization, Yang Zhong, 2021/04/19
- [PATCH 02/32] hostmem: Add hostmem-epc as a backend for SGX EPC, Yang Zhong, 2021/04/19
- [PATCH 01/32] memory: Add RAM_PROTECTED flag to skip IOMMU mappings, Yang Zhong, 2021/04/19
- [PATCH 03/32] qom: Add memory-backend-epc ObjectOptions support, Yang Zhong, 2021/04/19
- [PATCH 04/32] i386: Add 'sgx-epc' device to expose EPC sections to guest, Yang Zhong, 2021/04/19
- [PATCH 08/32] i386: Add SGX CPUID leaf FEAT_SGX_12_0_EBX, Yang Zhong, 2021/04/19
- [PATCH 06/32] i386: Add primary SGX CPUID and MSR defines, Yang Zhong, 2021/04/19
- [PATCH 05/32] vl: Add "sgx-epc" option to expose SGX EPC sections to guest, Yang Zhong, 2021/04/19
- [PATCH 09/32] i386: Add SGX CPUID leaf FEAT_SGX_12_1_EAX, Yang Zhong, 2021/04/19
- [PATCH 10/32] i386: Add get/set/migrate support for SGX_LEPUBKEYHASH MSRs,
Yang Zhong <=
- [PATCH 07/32] i386: Add SGX CPUID leaf FEAT_SGX_12_0_EAX, Yang Zhong, 2021/04/19
- [PATCH 12/32] i386: Update SGX CPUID info according to hardware/KVM/user input, Yang Zhong, 2021/04/19
- [PATCH 11/32] i386: Add feature control MSR dependency when SGX is enabled, Yang Zhong, 2021/04/19
- [PATCH 13/32] linux-headers: Add placeholder for KVM_CAP_SGX_ATTRIBUTE, Yang Zhong, 2021/04/19
- [PATCH 15/32] i386: Propagate SGX CPUID sub-leafs to KVM, Yang Zhong, 2021/04/19
- [PATCH 14/32] i386: kvm: Add support for exposing PROVISIONKEY to guest, Yang Zhong, 2021/04/19
- [PATCH 16/32] Adjust min CPUID level to 0x12 when SGX is enabled, Yang Zhong, 2021/04/19
- [PATCH 17/32] hw/i386/fw_cfg: Set SGX bits in feature control fw_cfg accordingly, Yang Zhong, 2021/04/19