Re: [edk2-devel] [PATCH V2] UefiCpuPkg CpuCommFeaturesLib: Fix ASSERT if LMCE is supported

["Laszlo Ersek" <lersek@redhat.com>]

On 05/22/19 12:17, Zeng, Star wrote:
> BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=1829
> 
> There will be ASSERT if LMCE is supported as below.
> DXE_ASSERT!: [CpuFeaturesDxe]
>   XXX\UefiCpuPkg\Library\CpuCommonFeaturesLib\MachineCheck.c (342):
>     ConfigData != ((void *) 0)
> 
> The code should get Config Data and FeatureControlGetConfigData
> could be used.
> 
> This issue is there since the code was added at the commit below.
> 
> Revision: 3d6275c1137c9633ce24e31522b71105367bd6a0
> Date: 2017/8/4 8:46:41
> UefiCpuPkg CpuCommonFeaturesLib: Enable LMCE feature.
> 
> The commits below are also related to move the code.
> 
> Revision: 023387144299741d727521b425ef443438aecc1f
> Date: 2017/9/1 10:12:38
> UefiCpuPkg/Lmce.c Remove useless file.
> 
> Revision: 306a5bcc6b0170d28b0db10bd359817bb4b1db9f
> Date: 2017/8/17 11:40:38
> UefiCpuPkg/CpuCommonFeaturesLib: Merge machine check code to same file.
> 
> So, the code should not be tested at all on a platform
> that supports LMCE.
> 
> BTW: A typo in LmceInitialize is also fixed.
> The typo is introduced by the commit below.
> 
> Revision: d28daaddb3e732468e930a809d3d3943a5de9558
> Date: 2018/10/17 9:24:05
> UefiCpuPkg/CpuCommonFeaturesLib: Register MSR base on scope Info.
> 
> Cc: Laszlo Ersek <lersek@redhat.com>
> Cc: Eric Dong <eric.dong@intel.com>
> Cc: Ray Ni <ray.ni@intel.com>
> Cc: Chandana Kumar <chandana.c.kumar@intel.com>
> Cc: Kevin Li <kevin.y.li@intel.com>
> Signed-off-by: Star Zeng <star.zeng@intel.com>
> 
> Notes:
>     v2: Based on Laszlo's great feedback.
>     - Update Ray's name and email address to match Maintainers.txt.
>     - Remove "Change-Id" line that was added unintended.
>     - Add more code history.
> 
> ---

[*]

>  UefiCpuPkg/Library/CpuCommonFeaturesLib/CpuCommonFeaturesLib.c | 2 +-
>  UefiCpuPkg/Library/CpuCommonFeaturesLib/MachineCheck.c         | 2 +-
>  2 files changed, 2 insertions(+), 2 deletions(-)

Thanks for the update. Just one more quick note:

- if you want to include the v2 changes in the commit message, then
please describe them above your Signed-off-by (in the normal commit
message body).

- If you don't want the v2 notes to be present in the final commit
message, then please add them between the "---" mark, and the diffstat.
I marked the location above with [*]. Then "git am" will automatically
ignore the notes.

No need to resubmit now, it's just a hint for the future.

Thanks
Laszlo

> diff --git a/UefiCpuPkg/Library/CpuCommonFeaturesLib/CpuCommonFeaturesLib.c b/UefiCpuPkg/Library/CpuCommonFeaturesLib/CpuCommonFeaturesLib.c
> index 738b57dc87f9..9ddc6ce9d476 100644
> --- a/UefiCpuPkg/Library/CpuCommonFeaturesLib/CpuCommonFeaturesLib.c
> +++ b/UefiCpuPkg/Library/CpuCommonFeaturesLib/CpuCommonFeaturesLib.c
> @@ -214,7 +214,7 @@ CpuCommonFeaturesLibConstructor (
>    if (IsCpuFeatureSupported (CPU_FEATURE_LMCE)) {
>      Status = RegisterCpuFeature (
>                 "LMCE",
> -               NULL,
> +               FeatureControlGetConfigData,
>                 LmceSupport,
>                 LmceInitialize,
>                 CPU_FEATURE_LMCE,
> diff --git a/UefiCpuPkg/Library/CpuCommonFeaturesLib/MachineCheck.c b/UefiCpuPkg/Library/CpuCommonFeaturesLib/MachineCheck.c
> index 9ee559130080..2528e0044ecb 100644
> --- a/UefiCpuPkg/Library/CpuCommonFeaturesLib/MachineCheck.c
> +++ b/UefiCpuPkg/Library/CpuCommonFeaturesLib/MachineCheck.c
> @@ -322,7 +322,7 @@ LmceInitialize (
>    MSR_IA32_FEATURE_CONTROL_REGISTER    *MsrRegister;
>  
>    //
> -  // The scope of FastStrings bit in the MSR_IA32_MISC_ENABLE is core for below processor type, only program
> +  // The scope of LcmeOn bit in the MSR_IA32_MISC_ENABLE is core for below processor type, only program
>    // MSR_IA32_MISC_ENABLE for thread 0 in each core.
>    //
>    if (IS_SILVERMONT_PROCESSOR (CpuInfo->DisplayFamily, CpuInfo->DisplayModel) ||
>