linux-kernel - Re: [PATCH] xen/virtio: Handle PCI devices which Host controller is described in DT

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Date:   Fri, 7 Oct 2022 07:57:13 +0200
From:   Juergen Gross <jgross@...e.com>
To:     Oleksandr Tyshchenko <olekstysh@...il.com>,
        xen-devel@...ts.xenproject.org, linux-kernel@...r.kernel.org
Cc:     Oleksandr Tyshchenko <oleksandr_tyshchenko@...m.com>,
        Stefano Stabellini <sstabellini@...nel.org>
Subject: Re: [PATCH] xen/virtio: Handle PCI devices which Host controller is
 described in DT

On 06.10.22 19:48, Oleksandr Tyshchenko wrote:
> From: Oleksandr Tyshchenko <oleksandr_tyshchenko@...m.com>
> 
> Use the same "xen-grant-dma" device concept (based on generic IOMMU
> device-tree bindings) for the PCI devices behind device-tree based
> PCI Host controller.
> 
> Signed-off-by: Oleksandr Tyshchenko <oleksandr_tyshchenko@...m.com>
> ---
> Slightly RFC. This is needed to support Xen grant mappings for virtio-pci devices
> on Arm at some point in the future. The Xen toolstack side is not published yet.
> Here, for PCI devices we use the same way to pass backend domid to the guest as for
> platform devices.

I should mention we decided at the Xen Summit, that I will start a try to
modify the virtio spec to include the backend id (domid in the Xen case)
in the device independent config part.

As this will take some time to be accepted (if ever), other means to
specify the backend domid are needed until then. DT is one possibility
(at least on Arm), while Xenstore is the way to go for setups with a
Xen toolstack.


Juergen

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