On August 22, 2022 9:19 PM, Tom Lendacky wrote: > On 8/21/22 21:23, Min Xu wrote: > > From: Min M Xu <min.m...@intel.com> > > > > BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=3974 > > > > Ovmf work-area (PcdOvmfWorkArea) was designed to store the > > Confidential Computing guest information, including the CC guest type. > > This information will be probed by CcProbeLib so that the CC guest > > type can be determined in run-time. But the Ovmf work-area was > > reserved as BT_Data so that it cannot be accessed after > > ExitBootService. Please see the detailed analysis in BZ#3974. > > > > RH also reports a similar bug. Please see: > > https://bugzilla.redhat.com/show_bug.cgi?id=2114858 > > > > This patch reserves the work-area as RT_Data to fix this bug. > > The work area was never meant to be kept around. When first introduced, > Laszlo had said it could be used early, but that global structures should be > represented by PCDs. So the code is correct. It seems that the CcProbeLib > should be setting some PCDs during the start of DXE or similar for use during > run time services. > Hi, Tom The dynamic PCD is not thread-safe. Will IoLib be used in multi-thread scenario?
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