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Re: [PATCH v13 1/2] arm/pci: add pci_passhtrough_enabled check to pci_device_reset
- To: Jan Beulich <jbeulich@xxxxxxxx>
- From: Mykyta Poturai <Mykyta_Poturai@xxxxxxxx>
- Date: Fri, 18 Jul 2025 11:52:38 +0000
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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 11:52:53 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
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- Thread-topic: [PATCH v13 1/2] arm/pci: add pci_passhtrough_enabled check to pci_device_reset
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).
>
> Jan
Will adding an additional note that all of this only relates to Arm and
will not change x86 functionality be sufficient? 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.
--
Mykyta
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