Re: [edk2-devel] [PATCH v4 1/1] OvmfPkg/VirtHstiDxe: do not load driver in confidential guests

["Yao, Jiewen" <jiewen.yao@intel.com>]

Thanks Ard.

I have submitted https://github.com/tianocore/edk2/pull/5595 3 hours ago.
But it seems the CI stops working...



> -----Original Message-----
> From: Ard Biesheuvel <ardb@kernel.org>
> Sent: Thursday, April 25, 2024 12:27 AM
> To: Yao, Jiewen <jiewen.yao@intel.com>
> Cc: Gerd Hoffmann <kraxel@redhat.com>; devel@edk2.groups.io; Oliver Steffen
> <osteffen@redhat.com>; Ard Biesheuvel <ardb+tianocore@kernel.org>; Srikanth
> Aithal <sraithal@amd.com>
> Subject: Re: [PATCH v4 1/1] OvmfPkg/VirtHstiDxe: do not load driver in
> confidential guests
> 
> On Wed, 24 Apr 2024 at 08:45, Yao, Jiewen <jiewen.yao@intel.com> wrote:
> >
> > Reviewed-by: Jiewen Yao <Jiewen.yao@intel.com>
> >
> 
> Thanks, I've queued this up.
> 
> 
> > > -----Original Message-----
> > > From: Gerd Hoffmann <kraxel@redhat.com>
> > > Sent: Wednesday, April 24, 2024 2:00 PM
> > > To: devel@edk2.groups.io
> > > Cc: Oliver Steffen <osteffen@redhat.com>; Gerd Hoffmann
> > > <kraxel@redhat.com>; Ard Biesheuvel <ardb+tianocore@kernel.org>; Yao,
> Jiewen
> > > <jiewen.yao@intel.com>; Srikanth Aithal <sraithal@amd.com>
> > > Subject: [PATCH v4 1/1] OvmfPkg/VirtHstiDxe: do not load driver in
> confidential
> > > guests
> > >
> > > The VirtHstiDxe does not work in confidential guests.  There also isn't
> > > anything we can reasonably test, neither flash storage nor SMM mode will
> > > be used in that case.  So just skip driver load when running in a
> > > confidential guest.
> > >
> > > Cc: Ard Biesheuvel <ardb+tianocore@kernel.org>
> > > Cc: Jiewen Yao <jiewen.yao@intel.com>
> > > Fixes: 506740982bba ("OvmfPkg/VirtHstiDxe: add code flash check")
> > > Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
> > > Tested-by: Srikanth Aithal <sraithal@amd.com>
> > > ---
> > >  OvmfPkg/VirtHstiDxe/VirtHstiDxe.inf | 1 +
> > >  OvmfPkg/VirtHstiDxe/VirtHstiDxe.c   | 6 ++++++
> > >  2 files changed, 7 insertions(+)
> > >
> > > diff --git a/OvmfPkg/VirtHstiDxe/VirtHstiDxe.inf
> > > b/OvmfPkg/VirtHstiDxe/VirtHstiDxe.inf
> > > index 9514933011e8..b5c237288766 100644
> > > --- a/OvmfPkg/VirtHstiDxe/VirtHstiDxe.inf
> > > +++ b/OvmfPkg/VirtHstiDxe/VirtHstiDxe.inf
> > > @@ -49,6 +49,7 @@ [FeaturePcd]
> > >    gUefiOvmfPkgTokenSpaceGuid.PcdSmmSmramRequire
> > >
> > >  [Pcd]
> > > +  gEfiMdePkgTokenSpaceGuid.PcdConfidentialComputingGuestAttr
> > >    gUefiOvmfPkgTokenSpaceGuid.PcdBfvBase
> > >    gUefiOvmfPkgTokenSpaceGuid.PcdOvmfFlashNvStorageVariableBase
> > >
> > > diff --git a/OvmfPkg/VirtHstiDxe/VirtHstiDxe.c
> > > b/OvmfPkg/VirtHstiDxe/VirtHstiDxe.c
> > > index b6e53a1219d1..efaff0d1f3cb 100644
> > > --- a/OvmfPkg/VirtHstiDxe/VirtHstiDxe.c
> > > +++ b/OvmfPkg/VirtHstiDxe/VirtHstiDxe.c
> > > @@ -17,6 +17,7 @@ SPDX-License-Identifier: BSD-2-Clause-Patent
> > >  #include <Library/MemoryAllocationLib.h>
> > >  #include <Library/UefiBootServicesTableLib.h>
> > >  #include <Library/UefiLib.h>
> > > +#include <Library/PcdLib.h>
> > >  #include <Library/PlatformInitLib.h>
> > >
> > >  #include <IndustryStandard/Hsti.h>
> > > @@ -140,6 +141,11 @@ VirtHstiDxeEntrypoint (
> > >    EFI_STATUS                           Status;
> > >    EFI_EVENT                            Event;
> > >
> > > +  if (PcdGet64 (PcdConfidentialComputingGuestAttr)) {
> > > +    DEBUG ((DEBUG_INFO, "%a: confidential guest\n", __func__));
> > > +    return EFI_UNSUPPORTED;
> > > +  }
> > > +
> > >    DevId = VirtHstiGetHostBridgeDevId ();
> > >    switch (DevId) {
> > >      case INTEL_82441_DEVICE_ID:
> > > --
> > > 2.44.0
> >


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