diff options
| author | Michael Niewöhner <foss@mniewoehner.de> | 2020-10-11 15:56:21 +0200 |
|---|---|---|
| committer | Nico Huber <nico.h@gmx.de> | 2020-10-19 21:01:53 +0000 |
| commit | 13b9149bab28c24798507b152c4d212dd9512175 (patch) | |
| tree | e7a5ec3b802b5f2667988fe81b1a85bf6e50412d /src/cpu | |
| parent | 8b4a9380b54220a352cbc5eb55f600f5dce8475b (diff) | |
cpu/intel/common: rework AES-NI locking
Simplify the AES-NI code by using msr_set and correct the comment.
Change-Id: Ib2cda433bbec0192277839c02a1862b8f41340cb
Signed-off-by: Michael Niewöhner <foss@mniewoehner.de>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/46275
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Tim Wawrzynczak <twawrzynczak@chromium.org>
Reviewed-by: Nico Huber <nico.h@gmx.de>
Diffstat (limited to 'src/cpu')
| -rw-r--r-- | src/cpu/intel/common/common.h | 4 | ||||
| -rw-r--r-- | src/cpu/intel/common/common_init.c | 12 |
2 files changed, 6 insertions, 10 deletions
diff --git a/src/cpu/intel/common/common.h b/src/cpu/intel/common/common.h index aaeca1da10..57a51e5538 100644 --- a/src/cpu/intel/common/common.h +++ b/src/cpu/intel/common/common.h @@ -28,8 +28,8 @@ bool intel_ht_supported(void); bool intel_ht_sibling(void); /* - * Lock AES-NI feature (MSR_FEATURE_CONFIG) to prevent unintended disabling - * as suggested in Intel document 325384-070US. + * Lock AES-NI feature (MSR_FEATURE_CONFIG) to prevent unintended changes + * to the enablement state as suggested in Intel document 325384-070US. */ void set_aesni_lock(void); diff --git a/src/cpu/intel/common/common_init.c b/src/cpu/intel/common/common_init.c index e532c975cb..f189c598ac 100644 --- a/src/cpu/intel/common/common_init.c +++ b/src/cpu/intel/common/common_init.c @@ -266,10 +266,6 @@ void cpu_init_cppc_config(struct cppc_config *config, u32 version) } } -/* - * Lock AES-NI feature (MSR_FEATURE_CONFIG) to prevent unintended disabling - * as suggested in Intel document 325384-070US. - */ void set_aesni_lock(void) { msr_t msr; @@ -279,8 +275,8 @@ void set_aesni_lock(void) return; msr = rdmsr(MSR_FEATURE_CONFIG); - if ((msr.lo & 1) == 0) { - msr.lo |= 1; - wrmsr(MSR_FEATURE_CONFIG, msr); - } + if (msr.lo & AESNI_LOCK) + return; + + msr_set(MSR_FEATURE_CONFIG, AESNI_LOCK); } |