From: Stefano Stabellini <sstabellini@kernel.org>
To: Juergen Gross <jgross@suse.com>
Cc: Oleksandr Tyshchenko <olekstysh@gmail.com>,
xen-devel@lists.xenproject.org, linux-kernel@vger.kernel.org,
Oleksandr Tyshchenko <oleksandr_tyshchenko@epam.com>,
Stefano Stabellini <sstabellini@kernel.org>
Subject: Re: [PATCH] xen/virtio: Handle PCI devices which Host controller is described in DT
Date: Fri, 7 Oct 2022 13:24:58 -0700 (PDT) [thread overview]
Message-ID: <alpine.DEB.2.22.394.2210071324010.3690179@ubuntu-linux-20-04-desktop> (raw)
In-Reply-To: <014e7036-5daf-6465-663c-b690d6f719ee@suse.com>
On Fri, 7 Oct 2022, Juergen Gross wrote:
> On 06.10.22 19:48, Oleksandr Tyshchenko wrote:
> > From: Oleksandr Tyshchenko <oleksandr_tyshchenko@epam.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@epam.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.
Good idea
> 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.
What do you think of my idea of using PCI config registers on the *root
complex* (not the device) to retrieve the information?
prev parent reply other threads:[~2022-10-07 20:25 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-10-06 17:48 [PATCH] xen/virtio: Handle PCI devices which Host controller is described in DT Oleksandr Tyshchenko
2022-10-07 1:14 ` Stefano Stabellini
2022-10-12 20:26 ` Oleksandr Tyshchenko
2022-10-13 0:33 ` Stefano Stabellini
2022-10-15 15:47 ` Oleksandr Tyshchenko
2022-10-17 20:39 ` Stefano Stabellini
2022-10-19 13:34 ` Oleksandr Tyshchenko
2022-10-19 20:38 ` Stefano Stabellini
2022-10-20 18:01 ` Oleksandr Tyshchenko
2022-10-07 5:57 ` Juergen Gross
2022-10-07 20:24 ` Stefano Stabellini [this message]
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