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| author | Michael S. Tsirkin <mst@redhat.com> | 2025-12-29 18:24:36 -0500 |
|---|---|---|
| committer | Michael S. Tsirkin <mst@redhat.com> | 2026-01-08 09:54:26 -0500 |
| commit | 95c7b0ad6c69d1c0608ff0bbd358a546856beaf3 (patch) | |
| tree | f4fed8c40e9fcb26c48004ddf5dec6fcefa9598e /include/uapi | |
| parent | db191ba0c8564ff84877e5b1c9553e991feca239 (diff) | |
virtio_input: fix DMA alignment for evts
On non-cache-coherent platforms, when a structure contains a buffer
used for DMA alongside fields that the CPU writes to, cacheline sharing
can cause data corruption.
The evts array is used for DMA_FROM_DEVICE operations via
virtqueue_add_inbuf(). The adjacent lock and ready fields are written
by the CPU during normal operation. If these share cachelines with evts,
CPU writes can corrupt DMA data.
Add __dma_from_device_group_begin()/end() annotations to ensure evts is
isolated in its own cachelines.
Message-ID: <cd328233198a76618809bb5cd9a6ddcaa603a8a1.1767601130.git.mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Diffstat (limited to 'include/uapi')
0 files changed, 0 insertions, 0 deletions