linux-kernel - Re: [PATCH 2/3] xen/virtio: use dom0 as default backend for CONFIG_XEN_VIRTIO_FORCE

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Date:   Thu, 6 Oct 2022 17:23:44 +0000
From:   Oleksandr Tyshchenko <Oleksandr_Tyshchenko@...m.com>
To:     Juergen Gross <jgross@...e.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     Stefano Stabellini <sstabellini@...nel.org>,
        "xen-devel@...ts.xenproject.org" <xen-devel@...ts.xenproject.org>
Subject: Re: [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@...e.com>
> ---
>   drivers/xen/grant-dma-ops.c | 3 +++
>   1 file changed, 3 insertions(+)


Reviewed-by: Oleksandr Tyshchenko <oleksandr_tyshchenko@...m.com>

>
> 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