Re: [edk2-devel] [PATCH v3 0/6] UefiCpuPkg/MpInitLib: Add support for multiple MP_HAND_OFF HOBs

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

On 2/26/24 16:19, Laszlo Ersek wrote:
> On 2/22/24 17:01, Gerd Hoffmann wrote:
>> Needed to boot guests with thousands of vcpus.
>>
>> v3:
>>  - refine comments and commit messages.
>>  - fix MaxCpusPerHob calculation.
>>  - pick up review tags.
>>  - add patch to speed up GetBspNumber a bit.
>> v2:
>>  - rework HOB loops for better performance: O(n) instead of O(n^2).
>>
>> Gerd Hoffmann (6):
>>   UefiCpuPkg/MpInitLib: Add support for multiple HOBs to GetMpHandOffHob
>>   UefiCpuPkg/MpInitLib: Add support for multiple HOBs to GetBspNumber()
>>   UefiCpuPkg/MpInitLib: Add support for multiple HOBs to
>>     SwitchApContext()
>>   UefiCpuPkg/MpInitLib: Add support for multiple HOBs to
>>     MpInitLibInitialize
>>   UefiCpuPkg/MpInitLib: Add support for multiple HOBs to SaveCpuMpData()
>>   UefiCpuPkg/MpInitLib: return early in GetBspNumber()
>>
>>  UefiCpuPkg/Library/MpInitLib/MpLib.h    |  14 ++-
>>  UefiCpuPkg/Library/MpInitLib/MpLib.c    | 157 +++++++++++++++---------
>>  UefiCpuPkg/Library/MpInitLib/PeiMpLib.c |  44 ++++---
>>  3 files changed, 142 insertions(+), 73 deletions(-)
>>
> 
> BTW, differences in PR#5410 relative to v3 as posted:
> 
> 1:  678ed78d24a3 ! 1:  ecd6c4bb3396 UefiCpuPkg/MpInitLib: Add support for multiple HOBs to GetMpHandOffHob
>     @@ Commit message
> 
>          Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
>          Message-Id: <20240222160106.686484-2-kraxel@redhat.com>
>     +    Reviewed-by: Ray Ni <ray.ni@intel.com>
>     +    Reviewed-by: Laszlo Ersek <lersek@redhat.com>
> 
>       ## UefiCpuPkg/Library/MpInitLib/MpLib.h ##
>      @@ UefiCpuPkg/Library/MpInitLib/MpLib.h: SwitchApContext (
> 2:  23b3e66f9935 = 2:  189467980103 UefiCpuPkg/MpInitLib: Add support for multiple HOBs to GetBspNumber()
> 3:  e712d36775d0 = 3:  8ab0f63c0f04 UefiCpuPkg/MpInitLib: Add support for multiple HOBs to SwitchApContext()
> 4:  9a81417f4b76 ! 4:  995a8ace7801 UefiCpuPkg/MpInitLib: Add support for multiple HOBs to MpInitLibInitialize
>     @@ Commit message
>          Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
>          Reviewed-by: Ray Ni <ray.ni@intel.com>
>          Message-Id: <20240222160106.686484-5-kraxel@redhat.com>
>     +    Reviewed-by: Laszlo Ersek <lersek@redhat.com>
> 
>       ## UefiCpuPkg/Library/MpInitLib/MpLib.c ##
>      @@ UefiCpuPkg/Library/MpInitLib/MpLib.c: MpInitLibInitialize (
> 5:  3a089b25725e ! 5:  f23c0d125e48 UefiCpuPkg/MpInitLib: Add support for multiple HOBs to SaveCpuMpData()
>     @@ Commit message
> 
>          Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
>          Message-Id: <20240222160106.686484-6-kraxel@redhat.com>
>     +    Reviewed-by: Ray Ni <ray.ni@intel.com>
>     +    Reviewed-by: Laszlo Ersek <lersek@redhat.com>
>     +    [lersek@redhat.com: define one local variable per line [Ray]]
> 
>       ## UefiCpuPkg/Library/MpInitLib/PeiMpLib.c ##
>      @@ UefiCpuPkg/Library/MpInitLib/PeiMpLib.c: SaveCpuMpData (
>         IN CPU_MP_DATA  *CpuMpData
>         )
>       {
>     -+  UINT32           MaxCpusPerHob, CpusInHob;
>     ++  UINT32           MaxCpusPerHob;
>     ++  UINT32           CpusInHob;
>         UINT64           Data64;
>      -  UINTN            Index;
>     -+  UINT32           Index, HobBase;
>     ++  UINT32           Index;
>     ++  UINT32           HobBase;
>         CPU_INFO_IN_HOB  *CpuInfoInHob;
>         MP_HAND_OFF      *MpHandOff;
>         UINTN            MpHandOffSize;
> 6:  09435495e6e1 ! 6:  fbd8a114cd6e UefiCpuPkg/MpInitLib: return early in GetBspNumber()
>     @@ Commit message
>          Suggested-by: Laszlo Ersek <lersek@redhat.com>
>          Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
>          Message-Id: <20240222160106.686484-7-kraxel@redhat.com>
>     +    Reviewed-by: Ray Ni <ray.ni@intel.com>
>     +    Reviewed-by: Laszlo Ersek <lersek@redhat.com>
>     +    [lersek@redhat.com: s/ASSERT (FALSE)/ASSERT_EFI_ERROR (EFI_NOT_FOUND)/ [Ray]]
> 
>       ## UefiCpuPkg/Library/MpInitLib/MpLib.c ##
>      @@ UefiCpuPkg/Library/MpInitLib/MpLib.c: GetBspNumber (
>     @@ UefiCpuPkg/Library/MpInitLib/MpLib.c: GetBspNumber (
>      -  ASSERT (BspNumber != MAX_UINT32);
>      -
>      -  return BspNumber;
>     -+  ASSERT (FALSE);
>     ++  ASSERT_EFI_ERROR (EFI_NOT_FOUND);
>      +  return 0;
>       }
> 

Merged as commit range 1f161a7915e1..d25421d0d8cd, via
<https://github.com/tianocore/edk2/pull/5410>.

Laszlo



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