On Tue, Feb 08, 2022 at 08:20:20AM +0000, Xu, Min M wrote:
> On January 27, 2022 9:49 PM, Gerd Hoffmann wrote:
> > > + EFI_HOB_GUID_TYPE *GuidHob;
> > > + EFI_HOB_PLATFORM_INFO *PlatformInfo = NULL;
> >
> > > // Query Host Bridge DID to determine platform type
> > > + // Tdx guest stores the HostBridgePciDevId in a GuidHob.
> > > + // So we first check if this HOB exists
> >
> > Hmm, wouldn't it be better to create and use the PlatformInfo for both PEI-
> > based and PEI-less boot?
> >
> > > - HostBridgeDevId = PcdGet16 (PcdOvmfHostBridgePciDevId);
> > > + GuidHob = GetFirstGuidHob (&gUefiOvmfPkgTdxPlatformGuid); if
> > > + (GuidHob != NULL) {
> > > + PlatformInfo = (EFI_HOB_PLATFORM_INFO *)GET_GUID_HOB_DATA
> > (GuidHob);
> > > + HostBridgeDevId = PlatformInfo->HostBridgePciDevId; } else {
> > > + HostBridgeDevId = PcdGet16 (PcdOvmfHostBridgePciDevId); }
> >
> > We would not need that kind of checks in the first place then.
> >
> As we agreed at the first stage, only OvmfPkg/PlatformPei will be refactored
> with PlatformInitLib.
> OvmfPkg/Bhyve/PlatformPei and OvmfPkg/XenPlatformPei will be refactored in
> the future. HostBridgeDevId is set to PcdOvmfHostBridgePciDevId in these 2
> platforms.
> So we have to check both EFI_HOB_PLATFORM_INFO and PcdOvmfHostBridgePciDevId.
Ok. Can you add a comment explaining this?
thanks,
Gerd
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