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vfio/pci: Restore 8-byte ioeventfd support

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Commit b44a06bd28 ("vfio/pci: Remove #ifdef iowrite64 and #ifdef
ioread64") inadvertently converted a conditional 8-byte rejection
into an unconditional one.

Originally, 'count == 8' was rejected only if iowrite64 was undefined
(#ifndef iowrite64). When iowrite64 became globally available via generic
fallbacks, this rejection became dead code, allowing 8-byte ioeventfds.
However, b44a06bd28 removed the #ifndef wrappers but left the nested
'if (count == 8) return -EINVAL;' intact, breaking all 8-byte
registrations.

Drop the unconditional check to restore 8-byte ioeventfd support,
matching the original intent.

Fixes: b44a06bd28 ("vfio/pci: Remove #ifdef iowrite64 and #ifdef ioread64")
Cc: stable@vger.kernel.org
Signed-off-by: Li RongQing <lirongqing@baidu.com>
Link: https://lore.kernel.org/r/20260922040013.2188-1-lirongqing@baidu.com
Signed-off-by: Alex Williamson <alex@shazbot.org>
This commit is contained in:
Li RongQing 2026-09-22 12:00:13 +08:00 committed by Alex Williamson
parent 8b25b35840
commit b30b52c2fb
1 changed files with 0 additions and 3 deletions
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3
drivers/vfio/pci/vfio_pci_rdwr.c
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@ -423,9 +423,6 @@ int vfio_pci_ioeventfd(struct vfio_pci_core_device *vdev, loff_t offset,
pos >= vdev->msix_offset + vdev->msix_size))
return -EINVAL;
if (count == 8)
return -EINVAL;
io = vfio_pci_core_get_iomap(vdev, bar);
if (IS_ERR(io))
return PTR_ERR(io);