nvdimm: virtio_pmem: isolate DMA request buffers

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The virtio-pmem request object stores wait queues, flags, and list
pointers next to buffers mapped for virtqueue DMA. The response buffer is
mapped DMA_FROM_DEVICE, so non-coherent DMA invalidation must not share a
cache line with CPU-owned fields.

Keep the request buffer outside the DMA-from-device group and wrap only
the response buffer with __dma_from_device_group_begin/end.

Signed-off-by: Li Chen <me@linux.beauty>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Message-ID: <20260630092338.2094628-11-me@linux.beauty>

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Li Chen 2026-06-30 17:23:35 +08:00 • committed by Michael S. Tsirkin

parent 3f14003ce7

commit 8de2bc46db

1 changed files with 6 additions and 2 deletions

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drivers/nvdimm/virtio_pmem.h

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