linux-kernel - [PATCH v2 0/2] vfio/pci: Fix issues with qword access

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Message-ID: <20251218081650.555015-1-kevin.tian@intel.com>
Date: Thu, 18 Dec 2025 08:16:48 +0000
From: Kevin Tian <kevin.tian@...el.com>
To: Alex Williamson <alex@...zbot.org>,
	Ankit Agrawal <ankita@...dia.com>
Cc: Jason Gunthorpe <jgg@...pe.ca>,
	Yishai Hadas <yishaih@...dia.com>,
	Shameer Kolothum <skolothumtho@...dia.com>,
	Kevin Tian <kevin.tian@...el.com>,
	Ramesh Thomas <ramesh.thomas@...el.com>,
	Yunxiang Li <Yunxiang.Li@....com>,
	kvm@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH v2 0/2] vfio/pci: Fix issues with qword access

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(-)

-- 
2.43.0