audk/UefiCpuPkg/Library
Ruiyu Ni 8558838922 UefiCpuPkg/CommonFeature: Always set FEATURE_CONTROL.Lock
REF: https://bugzilla.tianocore.org/show_bug.cgi?id=1305

The patch reverts commit 1ed6498c4a
* UefiCpuPkg/CommonFeature: Skip locking when the feature is disabled

FEATURE_CONTROL.Lock bit is controlled by feature
CPU_FEATURE_LOCK_FEATURE_CONTROL_REGISTER. The commit 1ed649 fixes
a bug that when the feature is disabled, the Lock bit is cleared.
But it's a security hole if the bit is cleared when booting OS.
We can argue that platform needs to make sure the value
of PcdCpuFeaturesUserConfiguration should be set properly to make
sure feature CPU_FEATURE_LOCK_FEATURE_CONTROL_REGISTER is enabled.

But it's better to guarantee this in the generic core code.

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Ruiyu Ni <ruiyu.ni@intel.com>
Reviewed-by: Eric Dong <eric.dong@intel.com>
Acked-by: Laszlo Ersek <lersek@redhat.com>
Cc: Andrew Fish <afish@apple.com>
Cc: Leif Lindholm <leif.lindholm@linaro.org>
Cc: Michael D Kinney <michael.d.kinney@intel.com>
2018-11-14 11:02:48 +08:00
..
BaseUefiCpuLib UefiCpuPkg: Clean up source files 2018-06-28 11:19:53 +08:00
BaseXApicLib UefiCpuPkg: Clean up source files 2018-06-28 11:19:53 +08:00
BaseXApicX2ApicLib UefiCpuPkg: Clean up source files 2018-06-28 11:19:53 +08:00
CpuCommonFeaturesLib UefiCpuPkg/CommonFeature: Always set FEATURE_CONTROL.Lock 2018-11-14 11:02:48 +08:00
CpuExceptionHandlerLib UefiCpuPkg/CpuExceptionHandlerLib: always clear descriptor data in advance 2018-10-18 13:19:14 +08:00
MpInitLib UefiCpuPkg/MpInitLib: Rollback old change 2a5997f8. 2018-11-05 10:39:13 +08:00
MtrrLib UefiCpuPkg/MtrrLib: Revert "Skip MSR access when the pair is invalid" 2018-09-26 13:09:15 +08:00
PlatformSecLibNull UefiCpuPkg: Convert all .uni files to utf-8 2015-12-15 04:59:14 +00:00
RegisterCpuFeaturesLib UefiCpuPkg/RegisterCpuFeaturesLib: Separate semaphore container. 2018-11-11 10:02:45 +08:00
SecPeiDxeTimerLibUefiCpu UefiCpuPkg: Removing ipf which is no longer supported from edk2. 2018-08-14 08:58:28 +08:00
SmmCpuFeaturesLib UefiCpuPkg/SmmCpuFeaturesLib: [CVE-2017-5715] Stuff RSB before RSM 2018-08-21 16:11:15 +08:00
SmmCpuPlatformHookLibNull UefiCpuPkg: Convert all .uni files to utf-8 2015-12-15 04:59:14 +00:00