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VFIO fixes for v6.13-rc3

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- Fix migration dirty page tracking support in the mlx5-vfio-pci
    variant driver in configurations where the system page size exceeds
    the device maximum message size, and anticipate device updates where
    the opposite may also be required. (Yishai Hadas)
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Merge tag 'vfio-v6.13-rc3' of https://github.com/awilliam/linux-vfio

Pull vfio fix from Alex Williamson:

 - Fix migration dirty page tracking support in the mlx5-vfio-pci
   variant driver in configurations where the system page size exceeds
   the device maximum message size, and anticipate device updates where
   the opposite may also be required (Yishai Hadas)

* tag 'vfio-v6.13-rc3' of https://github.com/awilliam/linux-vfio:
  vfio/mlx5: Align the page tracking max message size with the device capability
This commit is contained in:
Linus Torvalds 2024-12-11 13:48:25 -08:00
commit ec8e2d3889
1 changed files with 35 additions and 12 deletions
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47
drivers/vfio/pci/mlx5/cmd.c
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@ -1517,7 +1517,8 @@ int mlx5vf_start_page_tracker(struct vfio_device *vdev,
struct mlx5_vhca_qp *host_qp;
struct mlx5_vhca_qp *fw_qp;
struct mlx5_core_dev *mdev;
u32 max_msg_size = PAGE_SIZE;
u32 log_max_msg_size;
u32 max_msg_size;
u64 rq_size = SZ_2M;
u32 max_recv_wr;
int err;
@ -1534,6 +1535,12 @@ int mlx5vf_start_page_tracker(struct vfio_device *vdev,
}
mdev = mvdev->mdev;
log_max_msg_size = MLX5_CAP_ADV_VIRTUALIZATION(mdev, pg_track_log_max_msg_size);
max_msg_size = (1ULL << log_max_msg_size);
/* The RQ must hold at least 4 WQEs/messages for successful QP creation */
if (rq_size < 4 * max_msg_size)
rq_size = 4 * max_msg_size;
memset(tracker, 0, sizeof(*tracker));
tracker->uar = mlx5_get_uars_page(mdev);
if (IS_ERR(tracker->uar)) {
@ -1623,25 +1630,41 @@ set_report_output(u32 size, int index, struct mlx5_vhca_qp *qp,
{
u32 entry_size = MLX5_ST_SZ_BYTES(page_track_report_entry);
u32 nent = size / entry_size;
u32 nent_in_page;
u32 nent_to_set;
struct page *page;
u32 page_offset;
u32 page_index;
u32 buf_offset;
void *kaddr;
u64 addr;
u64 *buf;
int i;
if (WARN_ON(index >= qp->recv_buf.npages ||
buf_offset = index * qp->max_msg_size;
if (WARN_ON(buf_offset + size >= qp->recv_buf.npages * PAGE_SIZE ||
(nent > qp->max_msg_size / entry_size)))
return;
page = qp->recv_buf.page_list[index];
buf = kmap_local_page(page);
for (i = 0; i < nent; i++) {
addr = MLX5_GET(page_track_report_entry, buf + i,
dirty_address_low);
addr |= (u64)MLX5_GET(page_track_report_entry, buf + i,
dirty_address_high) << 32;
iova_bitmap_set(dirty, addr, qp->tracked_page_size);
}
kunmap_local(buf);
do {
page_index = buf_offset / PAGE_SIZE;
page_offset = buf_offset % PAGE_SIZE;
nent_in_page = (PAGE_SIZE - page_offset) / entry_size;
page = qp->recv_buf.page_list[page_index];
kaddr = kmap_local_page(page);
buf = kaddr + page_offset;
nent_to_set = min(nent, nent_in_page);
for (i = 0; i < nent_to_set; i++) {
addr = MLX5_GET(page_track_report_entry, buf + i,
dirty_address_low);
addr |= (u64)MLX5_GET(page_track_report_entry, buf + i,
dirty_address_high) << 32;
iova_bitmap_set(dirty, addr, qp->tracked_page_size);
}
kunmap_local(kaddr);
buf_offset += (nent_to_set * entry_size);
nent -= nent_to_set;
} while (nent);
}
static void