Public bug reported:
Description: vfio/pci: fix 8-byte PCI loads and stores
Symptom:
Reading from or writing to 64 bit registers (I/O ports or MMIO) on a PCI
adapter attached via vfio with e.g. the pread()/pwrite() system calls may not
work in case the PCI adapter requires a full read or write that can not be
broken up.
Problem:
64 bit reads/writes are not implemented via the vfio I/O port or MMIO access,
even if the architecture supports 64 bit I/O reads and writes.
Solution:
Implement the use of 64 bit I/O reads and writes in the vfio driver, so that
such reads and writes are not broken up into multiple smaller operations if the
architecture supports such bigger operations.
Upstream-IDs:
186bfe44ea41fb38c7a69becd7078724d28cd03c
4df13a6871d9e97aeeef72244e9a954c5cf11f54
Component: kernel
** Affects: linux (Ubuntu)
Importance: Undecided
Assignee: Skipper Bug Screeners (skipper-screen-team)
Status: New
** Tags: architecture-s39064 bugnameltc-214777 severity-high
targetmilestone-inin---
** Tags added: architecture-s39064 bugnameltc-214777 severity-high
targetmilestone-inin---
** Changed in: ubuntu
Assignee: (unassigned) => Skipper Bug Screeners (skipper-screen-team)
** Package changed: ubuntu => linux (Ubuntu)
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https://bugs.launchpad.net/bugs/2121146
Title:
[UBUNTU 24.04] vfio/pci: fix 8-byte PCI loads and stores
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