Re: [PATCH v2 0/2] vfio/pci: Fix issues with qword access

[Alex Williamson <alex@shazbot.org>]

On Thu, 18 Dec 2025 08:16:48 +0000
Kevin Tian <kevin.tian@intel.com> wrote:

> Certain devices (e.g. Intel X710) don't support qword access to the
> rom bar, otherwise PCI aer errors are observed. Fix it by disabling
> the qword access to the rom bar.
> 
> While at it, also restrict accesses to the legacy VGA resource to
> dword. More for paranoia so stable kernel is not CC-ed.
> 
> v2:
> - Rebase to 6.19-rc1
> - Use enum to avoid adding another bool arg (Alex)
> - Elaborate the commit msg (Alex)
> - New patch to disallow qword access to legacy VGA (Alex)
> 
> v1:
> https://lore.kernel.org/all/20251212020941.338355-1-kevin.tian@intel.com/
> 
> Kevin Tian (2):
>   vfio/pci: Disable qword access to the PCI ROM bar
>   vfio/pci: Disable qword access to the VGA region
> 
>  drivers/vfio/pci/nvgrace-gpu/main.c |  4 ++--
>  drivers/vfio/pci/vfio_pci_rdwr.c    | 25 ++++++++++++++++++-------
>  include/linux/vfio_pci_core.h       | 10 +++++++++-
>  3 files changed, 29 insertions(+), 10 deletions(-)
> 

Applied to vfio for-linus branch for v6.19.  Thanks,

Alex