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Re: [PATCH v13 1/2] arm/pci: add pci_passhtrough_enabled check to pci_device_reset
- To: Mykyta Poturai <Mykyta_Poturai@xxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Fri, 18 Jul 2025 15:29:32 +0200
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, Julien Grall <julien@xxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Fri, 18 Jul 2025 13:29:36 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 18.07.2025 13:52, Mykyta Poturai wrote:
> On 16.07.25 11:36, Jan Beulich wrote:
>> On 16.07.2025 09:43, Mykyta Poturai wrote:
>>> Without pci-passthrough=on Xen does not know anything about present PCI
>>> devices due to PHYSDEVOP_pci_device_add not executing.
>>
>> While the latter half of the sentence is true, Xen may know of PCI devices
>> be other means. It scans the bus itself after all on x86, under certain
>> conditions. Furthermore "pci-passthrough" is an Arm-only option, when the
>> change here affects x86 as much. The description therefore will need some
>> improvement; the code change itself is okay (on the assumption that it can
>> be justified properly).
>
> Will adding an additional note that all of this only relates to Arm and
> will not change x86 functionality be sufficient?
Probably.
Jan
> As far as I understand,
> this sentence is completely true for Arm, even the yet-to-be-upstreamed
> bus scanning routines in Xen are guarded by is_pci_passthroug_enabled in
> the latest patches I've seen them in.
>
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