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-rw-r--r--src/security/intel/txt/ramstage.c22
-rw-r--r--src/security/intel/txt/txt_register.h3
2 files changed, 18 insertions, 7 deletions
diff --git a/src/security/intel/txt/ramstage.c b/src/security/intel/txt/ramstage.c
index 86bf7aa428..76eeaaffef 100644
--- a/src/security/intel/txt/ramstage.c
+++ b/src/security/intel/txt/ramstage.c
@@ -316,6 +316,7 @@ static void lockdown_intel_txt(void *unused)
{
const uint64_t status = read64((void *)TXT_SPAD);
+ uint32_t txt_feature_flags = 0;
uintptr_t tseg_base;
size_t tseg_size;
@@ -324,13 +325,24 @@ static void lockdown_intel_txt(void *unused)
if (status & ACMSTS_TXT_DISABLED)
return;
- printk(BIOS_INFO, "TEE-TXT: Locking TEE...\n");
+ /*
+ * Document Number: 558294
+ * Chapter 5.4.3 Detection of Intel TXT Capability
+ */
- /* Lock TXT config, unlocks TXT_HEAP_BASE */
- if (intel_txt_run_bios_acm(ACMINPUT_LOCK_CONFIG) < 0) {
- printk(BIOS_ERR, "TEE-TXT: Failed to lock registers.\n");
- printk(BIOS_ERR, "TEE-TXT: SINIT won't be supported.\n");
+ if (!getsec_parameter(NULL, NULL, NULL, NULL, NULL, &txt_feature_flags))
return;
+
+ /* LockConfig only exists on Intel TXT for Servers */
+ if (txt_feature_flags & GETSEC_PARAMS_TXT_EXT_CRTM_SUPPORT) {
+ printk(BIOS_INFO, "TEE-TXT: Locking TEE...\n");
+
+ /* Lock TXT config, unlocks TXT_HEAP_BASE */
+ if (intel_txt_run_bios_acm(ACMINPUT_LOCK_CONFIG) < 0) {
+ printk(BIOS_ERR, "TEE-TXT: Failed to lock registers.\n");
+ printk(BIOS_ERR, "TEE-TXT: SINIT won't be supported.\n");
+ return;
+ }
}
/*
diff --git a/src/security/intel/txt/txt_register.h b/src/security/intel/txt/txt_register.h
index bbf0a7e72d..c19ec13799 100644
--- a/src/security/intel/txt/txt_register.h
+++ b/src/security/intel/txt/txt_register.h
@@ -132,8 +132,7 @@
#define IA32_GETSEC_SMCTRL 7
#define IA32_GETSEC_WAKEUP 8
-#define GETSEC_PARAMS_TXT_EXT (1ul << 5)
-#define GETSEC_PARAMS_TXT_EXT_CRTM_SUPPORT (1ul << 1)
+#define GETSEC_PARAMS_TXT_EXT_CRTM_SUPPORT (1ul << 5)
#define GETSEC_PARAMS_TXT_EXT_MACHINE_CHECK (1ul << 6)
/* ACM defines */