kernel/linux
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ synced 2026-11-10 20:48:12 +00:00
Code Issues Releases Packages Activity
linux/drivers/vfio
History
Kevin Tian a9040eac43 vfio/pci: Disable qword access to the PCI ROM bar 
[ Upstream commit dc85a46928 ]

Commit 2b938e3db3 ("vfio/pci: Enable iowrite64 and ioread64 for vfio
pci") enables qword access to the PCI bar resources. However certain
devices (e.g. Intel X710) are observed with problem upon qword accesses
to the rom bar, e.g. triggering PCI aer errors.

This is triggered by Qemu which caches the rom content by simply does a
pread() of the remaining size until it gets the full contents. The other
bars would only perform operations at the same access width as their
guest drivers.

Instead of trying to identify all broken devices, universally disable
qword access to the rom bar i.e. going back to the old way which worked
reliably for years.

Reported-by: Farrah Chen <farrah.chen@intel.com>
Closes: https://bugzilla.kernel.org/show_bug.cgi?id=220740
Fixes: 2b938e3db3 ("vfio/pci: Enable iowrite64 and ioread64 for vfio pci")
Cc: stable@vger.kernel.org
Signed-off-by: Kevin Tian <kevin.tian@intel.com>
Tested-by: Farrah Chen <farrah.chen@intel.com>
Link: https://lore.kernel.org/r/20251218081650.555015-2-kevin.tian@intel.com
Signed-off-by: Alex Williamson <alex@shazbot.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
History 2026-01-08 10:17:21 +01:00
..
cdx vfio/cdx: update driver to build without CONFIG_GENERIC_MSI_IRQ 2025-08-27 12:14:13 -06:00
fsl-mc vfio/fsl-mc: Mark for removal 2025-08-27 09:23:00 -06:00
mdev drivers: core: remove device_link argument from class_compat_[create|remove]_link 2025-01-10 15:42:20 +01:00
pci vfio/pci: Disable qword access to the PCI ROM bar 2026-01-08 10:17:21 +01:00
platform vfio/platform: Mark reset drivers for removal 2025-09-19 14:36:38 -06:00
container.c VFIO updates for v6.3-rc1 2023-02-25 11:52:57 -08:00
debugfs.c vfio: Dump migration features under debugfs 2025-10-06 11:22:48 -06:00
device_cdev.c vfio: Fix ksize arg while copying user struct in vfio_df_ioctl_bind_iommufd() 2026-01-02 12:57:28 +01:00
group.c vfio: Fix unbalanced vfio_df_close call in no-iommu mode 2025-07-11 14:43:37 -06:00
iommufd.c vfio: Fix unbalanced vfio_df_close call in no-iommu mode 2025-07-11 14:43:37 -06:00
Kconfig vfio/migration: Add debugfs to live migration driver 2023-12-04 14:29:08 -07:00
Makefile vfio/migration: Add debugfs to live migration driver 2023-12-04 14:29:08 -07:00
vfio.h vfio: replace CONFIG_HAVE_KVM with IS_ENABLED(CONFIG_KVM) 2024-02-08 08:45:35 -05:00
vfio_iommu_spapr_tce.c vfio/spapr: Always clear TCEs before unsetting the window 2024-06-28 17:03:39 +10:00
vfio_iommu_type1.c vfio/type1: handle DMA map/unmap up to the addressable limit 2025-10-28 15:54:41 -06:00
vfio_main.c vfio: return -ENOTTY for unsupported device feature 2025-09-19 14:45:43 -06:00
virqfd.c assorted variants of irqfd setup: convert to CLASS(fd) 2024-11-03 01:28:07 -05:00