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vdpa/mlx5: Fix oversized null mkey longer than 32bit

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commit a6097e0a54 upstream.

create_user_mr() has correct code to count the number of null keys
used to fill in a hole for the memory map. However, fill_indir()
does not follow the same to cap the range up to the 1GB limit
correspondingly. Fill in more null keys for the gaps in between,
so that null keys are correctly populated.

Fixes: 94abbccdf2 ("vdpa/mlx5: Add shared memory registration code")
Cc: stable@vger.kernel.org
Reported-by: Cong Meng <cong.meng@oracle.com>
Signed-off-by: Si-Wei Liu <si-wei.liu@oracle.com>
Signed-off-by: Dragos Tatulea <dtatulea@nvidia.com>
Acked-by: Eugenio Pérez <eperezma@redhat.com>
Message-Id: <20250220193732.521462-2-dtatulea@nvidia.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Si-Wei Liu 2025-02-20 21:37:33 +02:00 committed by Greg Kroah-Hartman
parent 515c34cff8
commit fef7fd3653
1 changed files with 5 additions and 2 deletions
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7
drivers/vdpa/mlx5/core/mr.c
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@ -165,9 +165,12 @@ again:
klm->bcount = cpu_to_be32(klm_bcount(dmr->end - dmr->start)); klm->bcount = cpu_to_be32(klm_bcount(dmr->end - dmr->start));
preve = dmr->end; preve = dmr->end;
} else { } else {
u64 bcount = min_t(u64, dmr->start - preve, MAX_KLM_SIZE);
klm->key = cpu_to_be32(mvdev->res.null_mkey); klm->key = cpu_to_be32(mvdev->res.null_mkey);
klm->bcount = cpu_to_be32(klm_bcount(dmr->start - preve)); klm->bcount = cpu_to_be32(klm_bcount(bcount));
preve = dmr->start; preve += bcount;
goto again; goto again;
} }
} }