Re: [PATCH V2 5/6] MdePkg: Probe Cc guest in BaseIoLibIntrinsicSev

Min Xu

On May 17, 2022 6:22 AM, dann frazier wrote:
I ran through our tests on stable-202205-rc1, and I'm finding that all of the
tests using 2M FD_SIZE & SMM_REQUIRE=TRUE are failing with QEMU
hanging w/o output. Equivalent tests w/ 4M FD_SIZE are working fine. I
bisected it down to this commit, and also confirmed that reverting this
commit on top of 202205-rc1 also avoids the problem.

I might have a chance to debug more tomorrow, but for now I just wanted to
flag it.
This patch calls CcProbe () to get the Confidential Computing guest type. There are 2 versions of CcProbeLib, one is to get the Cc guest type from PcdOvmfWorkArea, the other is a null instance and it always return CcGuestTypeNonEncrypted (which means it is a legacy vm guest). Only OvmfPkgX64.dsc and IntelTdxX64.dsc include the first one (which probe the PcdOvmfWorkArea).

If this patch is reverted, it means it is to check the guest type by calling CPUID, not reading the PcdOvmfWorkArea.

Can you share your build command and qemu command so that I can try it in my side?


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