[edk2-devel] [PATCH RFC v3 01/22] UefiCpuPkg: Define the SEV-SNP specific dynamic PCDs

Laszlo Ersek lersek at redhat.com
Thu Jun 3 13:07:34 UTC 2021

On 06/03/21 14:16, Brijesh Singh wrote:
> On 6/3/21 3:15 AM, Laszlo Ersek wrote:
>> Hi Brijesh,
>> On 05/27/21 01:10, Brijesh Singh wrote:
>>> BZ: https://nam11.safelinks.protection.outlook.com/?url=https%3A%2F%2Fbugzilla.tianocore.org%2Fshow_bug.cgi%3Fid%3D3275&data=04%7C01%7Cbrijesh.singh%40amd.com%7Cb4d27ba148e544f984ee08d92667d860%7C3dd8961fe4884e608e11a82d994e183d%7C0%7C0%7C637583049740462496%7CUnknown%7CTWFpbGZsb3d8eyJWIjoiMC4wLjAwMDAiLCJQIjoiV2luMzIiLCJBTiI6Ik1haWwiLCJXVCI6Mn0%3D%7C1000&sdata=DaecxXoG%2BK932q9T70ISC%2BAIX4%2BUrAf6is6lEJmi9co%3D&reserved=0
>>> Define the PCDs used by the MpLib while creating the AP when SEV-SNP is
>>> active in the guest VMs.
>>> Cc: James Bottomley <jejb at linux.ibm.com>
>>> Cc: Min Xu <min.m.xu at intel.com>
>>> Cc: Jiewen Yao <jiewen.yao at intel.com>
>>> Cc: Tom Lendacky <thomas.lendacky at amd.com>
>>> Cc: Jordan Justen <jordan.l.justen at intel.com>
>>> Cc: Ard Biesheuvel <ardb+tianocore at kernel.org>
>>> Cc: Laszlo Ersek <lersek at redhat.com>
>>> Cc: Erdem Aktas <erdemaktas at google.com>
>>> Signed-off-by: Brijesh Singh <brijesh.singh at amd.com>
>>> ---
>>>  UefiCpuPkg/UefiCpuPkg.dec | 11 +++++++++++
>>>  1 file changed, 11 insertions(+)
>> I'm really sorry that this is my first "actual" comment (on the 7th day
>> of your posting this series), but the CC list is incorrect on this
>> patch, and (at least) on patch#11 as well.
>> I'm a stickler myself for being CC'd on any patches per
>> "Maintainers.txt", so I'm going to request a resending of this series,
>> with the CC lists extended.
>> Please run "$EDK_TOOLS_PATH/Scripts/GetMaintainer.py" on every patch in
>> the series, and add the missing CC's. Manually copying all of the
>> "confidential computing" reviewers on all of the patches is great, but
>> we need to keep the usual package-level reviewers/maintainers as well.
>> In particular, the UefiCpuPkg patches need to be copied to Eric, Ray and
>> Rahul -- like you actually did in patch#21. Patch#22 also misses the
>> MdePkg reviewers (Michael, Liming, Zhiguang).
> Actually all the UefiCpuPkg maintainers/reviewers are CC'ed in the whole
> series. Its just that they are not listed in the git commit Cc tag.

I'm sorry for missing that -- I never use git's command line CC
switch(es), because those are easy to forget upon rebases / multiple
postings. I exclusively use the commit messages for CC's, and so I
didn't even check the actual address list on your patch email. My apologies.

> Patch#22 was a single one liner which bumps the version number after the
> SNP support is added. I was not sure if MdePkg maintainer will have much
> comment so I tried to avoid flooding the inbox -- I guess I should have
> copied them. I will resend with Cc tags updated.

Assuming it's going to be me to (potentially) merge this series, I'd
never merge an MdePkg patch without MdePkg owner/reviewer approval,
regardless of content (deciding about the content's impact is up to the
MdePkg owners/reviewers too).

On the other hand, if it's really just the last patch missing some CC's,
then I'll bring in the MdePkg reviewers by replying to that patch and
keeping full context for them.

Based on the above, please don't bother with another resend, and I'm
sorry about missing the actual CC's.


>> I'm truly sorry that this must feel like a cop-out on my part. I won't
>> deny that I appreciate a breather after the last two, hellishly busy,
>> two weeks, but I *did* resolve last night to start reviewing this series
>> today. (I should note that we expect reviewers to start reviewing a
>> patch set within a calendar week, so my feedback *is* just in time by my
>> count -- except, I expected to make actual patch review comments.)
>> If you can resend today with the CC's correct, I'll make an attempt to
>> start reviewing tomorrow.
>> Also, let me point this out: we have a nice long CC list now, by virtue
>> of the "confidential computing" section in "Maintainers.txt", and a
>> calendar week has passed -- I'd have appreciated seeing comments from
>> others as well!
>> Thanks,
>> Laszlo
>>> diff --git a/UefiCpuPkg/UefiCpuPkg.dec b/UefiCpuPkg/UefiCpuPkg.dec
>>> index 62acb291f309..0ec25871a50f 100644
>>> --- a/UefiCpuPkg/UefiCpuPkg.dec
>>> +++ b/UefiCpuPkg/UefiCpuPkg.dec
>>> @@ -396,5 +396,16 @@ [PcdsDynamic, PcdsDynamicEx]
>>>    # @Prompt SEV-ES Status
>>>    gUefiCpuPkgTokenSpaceGuid.PcdSevEsIsEnabled|FALSE|BOOLEAN|0x60000016
>>> +  ## This dynamic PCD indicates whether SEV-SNP is enabled
>>> +  #   TRUE  - SEV-SNP is enabled
>>> +  #   FALSE - SEV-SNP is not enabled
>>> +  # @Prompt SEV-SNP Status
>>> +  gUefiCpuPkgTokenSpaceGuid.PcdSevSnpIsEnabled|FALSE|BOOLEAN|0x60000017
>>> +
>>> +  ## This dynamic PCD contains the hypervisor features value obtained through the GHCB HYPERVISOR
>>> +  #  features VMGEXIT defined in the version 2 of GHCB spec.
>>> +  # @Prompt GHCB Hypervisor Features
>>> +  gUefiCpuPkgTokenSpaceGuid.PcdGhcbHypervisorFeatures|0x0|UINT64|0x60000018
>>> +
>>>  [UserExtensions.TianoCore."ExtraFiles"]
>>>    UefiCpuPkgExtra.uni

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