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Re: [PATCH v14 2/5] vpci: add initial support for virtual PCI bus topology
- To: Stewart Hildebrand <stewart.hildebrand@xxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Thu, 16 May 2024 11:23:32 +0200
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- Cc: Oleksandr Andrushchenko <oleksandr_andrushchenko@xxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, George Dunlap <george.dunlap@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Volodymyr Babchuk <volodymyr_babchuk@xxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Thu, 16 May 2024 09:23:40 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 14.05.2024 16:33, Stewart Hildebrand wrote:
> From: Oleksandr Andrushchenko <oleksandr_andrushchenko@xxxxxxxx>
>
> Assign SBDF to the PCI devices being passed through with bus 0.
> The resulting topology is where PCIe devices reside on the bus 0 of the
> root complex itself (embedded endpoints).
> This implementation is limited to 32 devices which are allowed on
> a single PCI bus.
>
> Please note, that at the moment only function 0 of a multifunction
> device can be passed through.
>
> Signed-off-by: Oleksandr Andrushchenko <oleksandr_andrushchenko@xxxxxxxx>
> Signed-off-by: Volodymyr Babchuk <volodymyr_babchuk@xxxxxxxx>
> Signed-off-by: Stewart Hildebrand <stewart.hildebrand@xxxxxxx>
I'm largely okay, so
Acked-by: Jan Beulich <jbeulich@xxxxxxxx>
Still my wariness remains towards the multi-function bit (it being set is
at least misleading when the device then has no further functions), and I
also remain not fully convinced by the earlier reply towards phantom
functions. While those indeed don't have any config space, is their setting
up in the IOMMU tables actually handled correctly for this virtual SBDF
case? It may well be (as the virtual coordinates _should_ indeed not matter
at all), but that's not entirely obvious.
Jan
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