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Re: [PATCH 1/3] xen/pci: do not register devices outside of PCI segment scope
- To: Roger Pau Monne <roger.pau@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Mon, 13 Jan 2025 08:17:23 +0100
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- Cc: Juergen Gross <jgross@xxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Oleksandr Tyshchenko <oleksandr_tyshchenko@xxxxxxxx>, linux-kernel@xxxxxxxxxxxxxxx, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Mon, 13 Jan 2025 07:17:40 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 10.01.2025 15:01, Roger Pau Monne wrote:
> The PCI segment value is limited to 16 bits, however there are buses like VMD
> that fake being part of the PCI topology by adding segment with a number
> outside the scope of the PCI firmware specification range (>= 0x10000). The
> MCFG ACPI Table "PCI Segment Group Number" field is defined as having a 16 bit
> width.
>
> Attempting to register or manage those devices with Xen would result in errors
> at best, or overlaps with existing devices living on the truncated equivalent
> segment values.
>
> Skip notifying Xen about those devices.
Hmm, is simply omitting the notification really all it takes? How would Xen
manage MSI / MSI-X, for example, without knowing of the device? As per the
BoF on the summit in Prague(?), I continue to think we need partial driver
logic in Xen for VMD ...
Jan
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