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-rw-r--r--src/security/intel/txt/Kconfig6
-rw-r--r--src/security/intel/txt/ramstage.c23
2 files changed, 19 insertions, 10 deletions
diff --git a/src/security/intel/txt/Kconfig b/src/security/intel/txt/Kconfig
index b1d0475edf..d3ef2a64db 100644
--- a/src/security/intel/txt/Kconfig
+++ b/src/security/intel/txt/Kconfig
@@ -40,6 +40,12 @@ config INTEL_TXT_DPR_SIZE
the MRC does not have an input to specify the size of DPR, so this
field is only used to check if the programmed size is large enough.
+config INTEL_TXT_TEST_BIOS_ACM_CALLING_CODE
+ bool "Test BIOS ACM calling code with NOP function"
+ help
+ Run a NOP function of the BIOS ACM to check that the ACM calling code
+ is functioning properly. Use in pre-production environments only!
+
config INTEL_TXT_LOGGING
bool "Enable verbose logging"
help
diff --git a/src/security/intel/txt/ramstage.c b/src/security/intel/txt/ramstage.c
index 00e9ce72a2..c39194ba47 100644
--- a/src/security/intel/txt/ramstage.c
+++ b/src/security/intel/txt/ramstage.c
@@ -151,17 +151,20 @@ static void init_intel_txt(void *unused)
return;
}
- printk(BIOS_INFO, "TEE-TXT: Testing BIOS ACM calling code...\n");
+ if (CONFIG(INTEL_TXT_TEST_BIOS_ACM_CALLING_CODE)) {
+ printk(BIOS_INFO, "TEE-TXT: Testing BIOS ACM calling code...\n");
- /*
- * Test BIOS ACM code.
- * ACM should do nothing on reserved functions, and return an error code
- * in TXT_BIOSACM_ERRORCODE. Tests showed that this is not true.
- * Use special function "NOP" that does 'nothing'.
- */
- if (intel_txt_run_bios_acm(ACMINPUT_NOP) < 0) {
- printk(BIOS_ERR, "TEE-TXT: Error calling BIOS ACM with NOP function.\n");
- return;
+ /*
+ * Test BIOS ACM code.
+ * ACM should do nothing on reserved functions, and return an error code
+ * in TXT_BIOSACM_ERRORCODE. Tests showed that this is not true.
+ * Use special function "NOP" that does 'nothing'.
+ */
+ if (intel_txt_run_bios_acm(ACMINPUT_NOP) < 0) {
+ printk(BIOS_ERR,
+ "TEE-TXT: Error calling BIOS ACM with NOP function.\n");
+ return;
+ }
}
if (status & (ACMSTS_BIOS_TRUSTED | ACMSTS_IBB_MEASURED)) {