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Re: [PATCH V9 2/2] libxl: Introduce basic virtio-mmio support on Arm
- To: Oleksandr Tyshchenko <olekstysh@xxxxxxxxx>
- From: Anthony PERARD <anthony.perard@xxxxxxxxxx>
- Date: Fri, 10 Jun 2022 16:12:35 +0100
- Authentication-results: esa6.hc3370-68.iphmx.com; dkim=none (message not signed) header.i=none
- Cc: <xen-devel@xxxxxxxxxxxxxxxxxxxx>, Julien Grall <julien.grall@xxxxxxx>, "Wei Liu" <wl@xxxxxxx>, Juergen Gross <jgross@xxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Bertrand Marquis <bertrand.marquis@xxxxxxx>, Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>, Oleksandr Tyshchenko <oleksandr_tyshchenko@xxxxxxxx>
- Delivery-date: Fri, 10 Jun 2022 15:12:54 +0000
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On Wed, Jun 01, 2022 at 08:57:41PM +0300, Oleksandr Tyshchenko wrote:
> From: Julien Grall <julien.grall@xxxxxxx>
>
> This patch introduces helpers to allocate Virtio MMIO params
> (IRQ and memory region) and create specific device node in
> the Guest device-tree with allocated params. In order to deal
> with multiple Virtio devices, reserve corresponding ranges.
> For now, we reserve 1MB for memory regions and 10 SPIs.
>
> As these helpers should be used for every Virtio device attached
> to the Guest, call them for Virtio disk(s).
>
> Please note, with statically allocated Virtio IRQs there is
> a risk of a clash with a physical IRQs of passthrough devices.
> For the first version, it's fine, but we should consider allocating
> the Virtio IRQs automatically. Thankfully, we know in advance which
> IRQs will be used for passthrough to be able to choose non-clashed
> ones.
>
> Signed-off-by: Julien Grall <julien.grall@xxxxxxx>
> Signed-off-by: Oleksandr Tyshchenko <oleksandr_tyshchenko@xxxxxxxx>
Reviewed-by: Anthony PERARD <anthony.perard@xxxxxxxxxx>
Thanks,
--
Anthony PERARD
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