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Re: [PATCH 2/3] xen/virtio: use dom0 as default backend for CONFIG_XEN_VIRTIO_FORCE_GRANT
- To: Juergen Gross <jgross@xxxxxxxx>, "linux-kernel@xxxxxxxxxxxxxxx" <linux-kernel@xxxxxxxxxxxxxxx>
- From: Oleksandr Tyshchenko <Oleksandr_Tyshchenko@xxxxxxxx>
- Date: Thu, 6 Oct 2022 17:23:44 +0000
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- Cc: Stefano Stabellini <sstabellini@xxxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Thu, 06 Oct 2022 17:24:02 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
- Thread-index: AQHY2VNlob0BWl5FK0K3rZia87E8oK4Bnh4A
- Thread-topic: [PATCH 2/3] xen/virtio: use dom0 as default backend for CONFIG_XEN_VIRTIO_FORCE_GRANT
On 06.10.22 10:14, Juergen Gross wrote:
Hello Juergen
> With CONFIG_XEN_VIRTIO_FORCE_GRANT set the default backend domid to 0,
> enabling to use xen_grant_dma_ops for those devices.
>
> Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
> ---
> drivers/xen/grant-dma-ops.c | 3 +++
> 1 file changed, 3 insertions(+)
Reviewed-by: Oleksandr Tyshchenko <oleksandr_tyshchenko@xxxxxxxx>
>
> diff --git a/drivers/xen/grant-dma-ops.c b/drivers/xen/grant-dma-ops.c
> index f29759d5301f..a00112235877 100644
> --- a/drivers/xen/grant-dma-ops.c
> +++ b/drivers/xen/grant-dma-ops.c
> @@ -349,6 +349,9 @@ void xen_grant_setup_dma_ops(struct device *dev)
> if (dev->of_node) {
> if (xen_dt_grant_setup_dma_ops(dev, data))
> goto err;
> + } else if (IS_ENABLED(CONFIG_XEN_VIRTIO_FORCE_GRANT)) {
> + dev_info(dev, "Using dom0 as backend\n");
> + data->backend_domid = 0;
> } else {
> /* XXX ACPI device unsupported for now */
> goto err;
--
Regards,
Oleksandr Tyshchenko
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