Re: [edk2-devel] [PATCH v2 1/1] UefiCpuPkg/MpInitLib: Always initialize the DoDecrement variable

["Dong, Eric" <eric.dong@intel.com>]

Reviewed-by: Eric Dong <eric.dong@intel.com>

> -----Original Message-----
> From: devel@edk2.groups.io <devel@edk2.groups.io> On Behalf Of
> Lendacky, Thomas
> Sent: Thursday, August 20, 2020 10:53 PM
> To: devel@edk2.groups.io
> Cc: Gao, Liming <liming.gao@intel.com>; Dong, Eric <eric.dong@intel.com>;
> Ni, Ray <ray.ni@intel.com>; Laszlo Ersek <lersek@redhat.com>; Kumar,
> Rahul1 <rahul1.kumar@intel.com>
> Subject: [edk2-devel] [PATCH v2 1/1] UefiCpuPkg/MpInitLib: Always initialize
> the DoDecrement variable
> 
> From: Tom Lendacky <thomas.lendacky@amd.com>
> 
> REF: https://bugzilla.tianocore.org/show_bug.cgi?id=2901
> 
> The DoDecrement variable in ApWakeupFunction () wasn't always being
> initialized. Update the code to always fully initialize it.
> 
> Cc: Eric Dong <eric.dong@intel.com>
> Cc: Ray Ni <ray.ni@intel.com>
> Cc: Laszlo Ersek <lersek@redhat.com>
> Cc: Rahul Kumar <rahul1.kumar@intel.com>
> Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
> ---
>  UefiCpuPkg/Library/MpInitLib/MpLib.c | 4 +---
>  1 file changed, 1 insertion(+), 3 deletions(-)
> 
> diff --git a/UefiCpuPkg/Library/MpInitLib/MpLib.c
> b/UefiCpuPkg/Library/MpInitLib/MpLib.c
> index 90416c81b616..07426274f639 100644
> --- a/UefiCpuPkg/Library/MpInitLib/MpLib.c
> +++ b/UefiCpuPkg/Library/MpInitLib/MpLib.c
> @@ -885,9 +885,7 @@ ApWakeupFunction (
>            UINT64                    Status;
>            BOOLEAN                   DoDecrement;
> 
> -          if (CpuMpData->InitFlag == ApInitConfig) {
> -            DoDecrement = TRUE;
> -          }
> +          DoDecrement = (BOOLEAN) (CpuMpData->InitFlag ==
> + ApInitConfig);
> 
>            while (TRUE) {
>              Msr.GhcbPhysicalAddress = AsmReadMsr64 (MSR_SEV_ES_GHCB);
> --
> 2.28.0
> 
> 
>