Re: [edk2-platform PATCH v1 1/1] Platform/RaspberryPi: Make SetVariable return EFI_UNSUPPORTED at runtime

["Ard Biesheuvel" <ardb@kernel.org>]

On Mon, 26 Jul 2021 at 09:18, Sunny Wang <Sunny.Wang@arm.com> wrote:
>
> Please ignore this patch. Making gRT->SetVariable at runtime return EFI_UNSUPPORTED would cause some OSes' installation failure/error.
> I thought the latest OS may support UNSUPPORTED case, but it turned out still an error/failure. I checked both Ubuntu 21.04 and OpenSUSE 15.3 Leap, and both of them could not be smoothly installed.
> I will take a further look into this and figure out a better solution.
>

ok

> Hi Ard,
> Yeah, I'm also working on EFI_RT_PROPERTIES_TABLE, but ran into some problems. I'm still debugging it. Hope using EFI_RT_PROPERTIES_TABLE won't cause OS installation failure.
>

ok


> Best Regards,
> Sunny Wang
>
> -----Original Message-----
> From: Ard Biesheuvel <ardb@kernel.org>
> Sent: Friday, July 23, 2021 11:10 PM
> To: Sunny Wang <Sunny.Wang@arm.com>
> Cc: edk2-devel-groups-io <devel@edk2.groups.io>; Samer El-Haj-Mahmoud <Samer.El-Haj-Mahmoud@arm.com>; Sami Mujawar <Sami.Mujawar@arm.com>; Jeremy Linton <Jeremy.Linton@arm.com>; Ard Biesheuvel <ardb+tianocore@kernel.org>; Pete Batard <pete@akeo.ie>; Leif Lindholm <leif@nuviainc.com>
> Subject: Re: [edk2-platform PATCH v1 1/1] Platform/RaspberryPi: Make SetVariable return EFI_UNSUPPORTED at runtime
>
> On Fri, 23 Jul 2021 at 11:15, Sunny Wang <Sunny.Wang@arm.com> wrote:
> >
> > The RPi does not support storing UEFI NV variables at runtime. For now,
> > gRT->SetVariable at runtime returns EFI_OUT_OF_RESOURCES which is not a
> > proper error and would cause FWTS failures. Therefore, this patch is
> > to make gRT->SetVariable at runtime return EFI_UNSUPPORTED.
> >
> > For more information, please check the issues below:
> >    -https://github.com/pftf/RPi4/issues/6
> >    -https://github.com/pftf/RPi4/issues/93
> >    -https://github.com/pftf/RPi4/issues/163
> >
> > I also tested this with the ACS 3.0 FWTS. All the failures
> > reported in issue 93 and 163 can be fixed by this patch.
> >
> > Cc: Samer El-Haj-Mahmoud <samer.el-haj-mahmoud@arm.com>
> > Cc: Sami Mujawar <sami.mujawar@arm.com>
> > Cc: Jeremy Linton <jeremy.linton@arm.com>
> > Cc: Ard Biesheuvel <ardb+tianocore@kernel.org>
> > Cc: Pete Batard <pete@akeo.ie>
> > Cc: Leif Lindholm <leif@nuviainc.com>
> >
> > Signed-off-by: Sunny Wang <sunny.wang@arm.com>
>
> This looks ok to me, but we should also expose this fact via the
> EFI_RT_PROPERTIES_TABLE, so that the OS can anticipate this result.
>
> > ---
> >  .../Drivers/VarBlockServiceDxe/VarBlockService.c     | 12 ++++++++++++
> >  1 file changed, 12 insertions(+)
> >
> > diff --git a/Platform/RaspberryPi/Drivers/VarBlockServiceDxe/VarBlockService.c b/Platform/RaspberryPi/Drivers/VarBlockServiceDxe/VarBlockService.c
> > index 572309439a..16d4d4f178 100644
> > --- a/Platform/RaspberryPi/Drivers/VarBlockServiceDxe/VarBlockService.c
> > +++ b/Platform/RaspberryPi/Drivers/VarBlockServiceDxe/VarBlockService.c
> > @@ -2,6 +2,7 @@
> >   *
> >   *  Copyright (c) 2018, Andrei Warkentin <andrey.warkentin@gmail.com>
> >   *  Copyright (c) 2006-2014, Intel Corporation. All rights reserved.
> > + *  Copyright (c) 2021, ARM Limited. All rights reserved.
> >   *
> >   *  SPDX-License-Identifier: BSD-2-Clause-Patent
> >   *
> > @@ -596,6 +597,7 @@ FvbProtocolWrite (
> >      EFI_DEVICE_ERROR      - The block device is not functioning correctly and
> >                              could not be written
> >      EFI_INVALID_PARAMETER - NumBytes or Buffer are NULL
> > +    EFI_UNSUPPORTED         This function is not supported at runtime
> >
> >  --*/
> >  {
> > @@ -605,6 +607,16 @@ FvbProtocolWrite (
> >    EFI_STATUS Status;
> >    EFI_STATUS ReturnStatus;
> >
> > +  //
> > +  // The current variables support relies on modifying RPI_EFI.FD on SD
> > +  // card, which works fine at boot time. However, at runtime, the SD
> > +  // controller is exposed via ACPI and subsequently owned by the OS.
> > +  // Therefore, we need to direclty return EFI_UNSUPPORTED.
> > +  //
> > +  if (EfiAtRuntime ()) {
> > +   return EFI_UNSUPPORTED;
> > +  }
> > +
> >    //
> >    // Check for invalid conditions.
> >    //
> > --
> > 2.31.0.windows.1
> >
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