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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>
This commit is contained in:
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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8
drivers/nvdimm/virtio_pmem.h
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@@ -10,6 +10,7 @@
#ifndef _LINUX_VIRTIO_PMEM_H
#define _LINUX_VIRTIO_PMEM_H
#include <linux/dma-mapping.h>
#include <linux/module.h>
#include <uapi/linux/virtio_pmem.h>
#include <linux/kref.h>
@@ -20,8 +21,6 @@
struct virtio_pmem_request {
struct kref kref;
struct virtio_pmem_req req;
struct virtio_pmem_resp resp;
/* Wait queue to process deferred work after ack from host */
wait_queue_head_t host_acked;
@@ -31,6 +30,11 @@ struct virtio_pmem_request {
wait_queue_head_t wq_buf;
bool wq_buf_avail;
struct list_head list;
struct virtio_pmem_req req;
__dma_from_device_group_begin(resp);
struct virtio_pmem_resp resp;
__dma_from_device_group_end(resp);
};
struct virtio_pmem {