diff mbox series

[v2] swiotlb-xen: provide the "max_mapping_size" method

Message ID 151bef41-e817-aea9-675-a35fdac4ed@redhat.com (mailing list archive)
State Accepted
Commit bff2a2d453a1b683378b4508b86b84389f551a00
Headers show
Series [v2] swiotlb-xen: provide the "max_mapping_size" method | expand

Commit Message

Mikulas Patocka Nov. 6, 2023, 5:12 p.m. UTC
From: Keith Busch <kbusch@kernel.org>

There's a bug that when using the XEN hypervisor with bios with large
multi-page bio vectors on NVMe, the kernel deadlocks [1].

The deadlocks are caused by inability to map a large bio vector -
dma_map_sgtable always returns an error, this gets propagated to the block
layer as BLK_STS_RESOURCE and the block layer retries the request
indefinitely.

XEN uses the swiotlb framework to map discontiguous pages into contiguous
runs that are submitted to the PCIe device. The swiotlb framework has a
limitation on the length of a mapping - this needs to be announced with
the max_mapping_size method to make sure that the hardware drivers do not
create larger mappings.

Without max_mapping_size, the NVMe block driver would create large
mappings that overrun the maximum mapping size.

Reported-by: Marek Marczykowski-Górecki <marmarek@invisiblethingslab.com>
Link: https://lore.kernel.org/stable/ZTNH0qtmint%2FzLJZ@mail-itl/ [1]
Tested-by: Marek Marczykowski-Górecki <marmarek@invisiblethingslab.com>
Suggested-by: Christoph Hellwig <hch@lst.de>
Cc: stable@vger.kernel.org
Signed-off-by: Keith Busch <kbusch@kernel.org>
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>

---
 drivers/xen/swiotlb-xen.c |    1 +
 1 file changed, 1 insertion(+)

Comments

Stefano Stabellini Nov. 7, 2023, 4:18 a.m. UTC | #1
On Mon, 6 Nov 2023, Mikulas Patocka wrote:
> From: Keith Busch <kbusch@kernel.org>
> 
> There's a bug that when using the XEN hypervisor with bios with large
> multi-page bio vectors on NVMe, the kernel deadlocks [1].
> 
> The deadlocks are caused by inability to map a large bio vector -
> dma_map_sgtable always returns an error, this gets propagated to the block
> layer as BLK_STS_RESOURCE and the block layer retries the request
> indefinitely.
> 
> XEN uses the swiotlb framework to map discontiguous pages into contiguous
> runs that are submitted to the PCIe device. The swiotlb framework has a
> limitation on the length of a mapping - this needs to be announced with
> the max_mapping_size method to make sure that the hardware drivers do not
> create larger mappings.
> 
> Without max_mapping_size, the NVMe block driver would create large
> mappings that overrun the maximum mapping size.
> 
> Reported-by: Marek Marczykowski-Górecki <marmarek@invisiblethingslab.com>
> Link: https://lore.kernel.org/stable/ZTNH0qtmint%2FzLJZ@mail-itl/ [1]
> Tested-by: Marek Marczykowski-Górecki <marmarek@invisiblethingslab.com>
> Suggested-by: Christoph Hellwig <hch@lst.de>
> Cc: stable@vger.kernel.org
> Signed-off-by: Keith Busch <kbusch@kernel.org>
> Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>

Acked-by: Stefano Stabellini <sstabellini@kernel.org>


> ---
>  drivers/xen/swiotlb-xen.c |    1 +
>  1 file changed, 1 insertion(+)
> 
> Index: linux-stable/drivers/xen/swiotlb-xen.c
> ===================================================================
> --- linux-stable.orig/drivers/xen/swiotlb-xen.c	2023-11-03 17:57:18.000000000 +0100
> +++ linux-stable/drivers/xen/swiotlb-xen.c	2023-11-06 15:30:59.000000000 +0100
> @@ -405,4 +405,5 @@ const struct dma_map_ops xen_swiotlb_dma
>  	.get_sgtable = dma_common_get_sgtable,
>  	.alloc_pages = dma_common_alloc_pages,
>  	.free_pages = dma_common_free_pages,
> +	.max_mapping_size = swiotlb_max_mapping_size,
>  };
Christoph Hellwig Nov. 8, 2023, 7:31 a.m. UTC | #2
Looks good:

Reviewed-by: Christoph Hellwig <hch@lst.de>
diff mbox series

Patch

Index: linux-stable/drivers/xen/swiotlb-xen.c
===================================================================
--- linux-stable.orig/drivers/xen/swiotlb-xen.c	2023-11-03 17:57:18.000000000 +0100
+++ linux-stable/drivers/xen/swiotlb-xen.c	2023-11-06 15:30:59.000000000 +0100
@@ -405,4 +405,5 @@  const struct dma_map_ops xen_swiotlb_dma
 	.get_sgtable = dma_common_get_sgtable,
 	.alloc_pages = dma_common_alloc_pages,
 	.free_pages = dma_common_free_pages,
+	.max_mapping_size = swiotlb_max_mapping_size,
 };