From: Sean Christopherson <sean.j.christopherson@xxxxxxxxx>
ENCLS and ENCLU are usable if and only if SGX_ENABLE is set and After
SGX is activated the IA32_SGXLEPUBKEYHASHn MSRs are writable if
SGX_LC_WR is set and the feature control is locked.
SGX related bits in IA32_FEATURE_CONTROL cannot be set before SGX is
activated by the pre-boot firmware. SGX activation is triggered by
setting bit 0 in the MSR 0x7a. Until SGX is activated, the LE hash MSRs
are writable to allow pre-boot firmware to lock down the LE root key
with a non-Intel value.
Signed-off-by: Sean Christopherson <sean.j.christopherson@xxxxxxxxx>
Co-developed-by: Haim Cohen <haim.cohen@xxxxxxxxx>
Signed-off-by: Haim Cohen <haim.cohen@xxxxxxxxx>
Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@xxxxxxxxxxxxxxx>
---
arch/x86/include/asm/msr-index.h | 8 ++++++++
arch/x86/kernel/cpu/common.c | 8 ++++----
2 files changed, 12 insertions(+), 4 deletions(-)
diff --git a/arch/x86/include/asm/msr-index.h b/arch/x86/include/asm/msr-index.h
index 4731f0cf97c5..44d7b68e7f52 100644
--- a/arch/x86/include/asm/msr-index.h
+++ b/arch/x86/include/asm/msr-index.h
@@ -486,6 +486,8 @@
#define FEATURE_CONTROL_LOCKED (1<<0)
#define FEATURE_CONTROL_VMXON_ENABLED_INSIDE_SMX (1<<1)
#define FEATURE_CONTROL_VMXON_ENABLED_OUTSIDE_SMX (1<<2)
+#define FEATURE_CONTROL_SGX_ENABLE (1<<18)
+#define FEATURE_CONTROL_SGX_LE_WR (1<<17)
#define FEATURE_CONTROL_LMCE (1<<20)
#define MSR_IA32_APICBASE 0x0000001b
@@ -552,6 +554,12 @@
#define PACKAGE_THERM_INT_LOW_ENABLE (1 << 1)
#define PACKAGE_THERM_INT_PLN_ENABLE (1 << 24)
+/* Intel SGX MSRs */
+#define MSR_IA32_SGXLEPUBKEYHASH0 0x0000008C
+#define MSR_IA32_SGXLEPUBKEYHASH1 0x0000008D
+#define MSR_IA32_SGXLEPUBKEYHASH2 0x0000008E
+#define MSR_IA32_SGXLEPUBKEYHASH3 0x0000008F
+
/* Thermal Thresholds Support */
#define THERM_INT_THRESHOLD0_ENABLE (1 << 15)
#define THERM_SHIFT_THRESHOLD0 8
diff --git a/arch/x86/kernel/cpu/common.c b/arch/x86/kernel/cpu/common.c
index 211c76322ddf..282ceef992b0 100644
--- a/arch/x86/kernel/cpu/common.c
+++ b/arch/x86/kernel/cpu/common.c
@@ -52,6 +52,7 @@
#include <asm/microcode_intel.h>
#include <asm/intel-family.h>
#include <asm/cpu_device_id.h>
+#include <asm/sgx_arch.h>
#ifdef CONFIG_X86_LOCAL_APIC
#include <asm/uv/uv.h>
@@ -866,10 +867,9 @@ void get_cpu_cap(struct cpuinfo_x86 *c)
}
}
- /* Intel SGX features: level 0x00000012 */
- if (c->cpuid_level >= 0x00000012) {
- cpuid(0x00000012, &eax, &ebx, &ecx, &edx);
-
+ /* Intel SGX features */
+ if (c->cpuid_level >= SGX_CPUID) {
+ cpuid(SGX_CPUID, &eax, &ebx, &ecx, &edx);
c->x86_capability[CPUID_12_EAX] = eax;
}
--
2.17.1
