Allow using BGRT table under Xen dom0

[PATCH 0/2] Allow using BGRT table under Xen dom0

Posted by Marek Marczykowski-Górecki 1 month ago

For a long time Xen was invalidating BGRT table as it was reclaiming
BootServicesData memory (where boot graphics is located). This is now changing,
and the boot graphics is preserved. This series has necessary changes to
actually make Linux use the preserved graphics.

This is a companion series to Xen side at
https://lore.kernel.org/xen-devel/20260305191810.31033-1-soumyajyotisarkar23@gmail.com/

CC: Soumyajyotii Ssarkar <soumyajyotisarkar23@gmail.com>
Cc: xen-devel@lists.xenproject.org
Cc: Ard Biesheuvel <ardb@kernel.org> (maintainer:EXTENSIBLE FIRMWARE INTERFACE (EFI))
Cc: Ilias Apalodimas <ilias.apalodimas@linaro.org> (reviewer:EXTENSIBLE FIRMWARE INTERFACE (EFI))
Cc: linux-efi@vger.kernel.org (open list:EXTENSIBLE FIRMWARE INTERFACE (EFI))

Marek Marczykowski-Górecki (2):
  efi: make efi_mem_type() and efi_mem_attributes() work on Xen PV
  efi: Enable BGRT loading under Xen

 drivers/firmware/efi/efi-bgrt.c |  7 +++++--
 drivers/firmware/efi/efi.c      | 27 +++++++++------------------
 2 files changed, 14 insertions(+), 20 deletions(-)

base-commit: 7e1526209cf972f51281558f1cb979d18e49cdd1
-- 
git-series 0.9.1

Re: [PATCH 0/2] Allow using BGRT table under Xen dom0

Posted by Ard Biesheuvel 1 month ago

On Mon, 9 Mar 2026, at 13:17, Marek Marczykowski-Górecki wrote:
> For a long time Xen was invalidating BGRT table as it was reclaiming
> BootServicesData memory (where boot graphics is located). This is now changing,
> and the boot graphics is preserved. This series has necessary changes to
> actually make Linux use the preserved graphics.
>
> This is a companion series to Xen side at
> https://lore.kernel.org/xen-devel/20260305191810.31033-1-soumyajyotisarkar23@gmail.com/
>
> CC: Soumyajyotii Ssarkar <soumyajyotisarkar23@gmail.com>
> Cc: xen-devel@lists.xenproject.org
> Cc: Ard Biesheuvel <ardb@kernel.org> (maintainer:EXTENSIBLE FIRMWARE 
> INTERFACE (EFI))
> Cc: Ilias Apalodimas <ilias.apalodimas@linaro.org> (reviewer:EXTENSIBLE 
> FIRMWARE INTERFACE (EFI))
> Cc: linux-efi@vger.kernel.org (open list:EXTENSIBLE FIRMWARE INTERFACE 
> (EFI))
>
> Marek Marczykowski-Górecki (2):
>   efi: make efi_mem_type() and efi_mem_attributes() work on Xen PV
>   efi: Enable BGRT loading under Xen
>
>  drivers/firmware/efi/efi-bgrt.c |  7 +++++--
>  drivers/firmware/efi/efi.c      | 27 +++++++++------------------
>  2 files changed, 14 insertions(+), 20 deletions(-)
>

Looks good to me - if nobody else has any concerns, I'll queue this up for v7.1