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Re: [PATCH v14 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: Thu, 24 Jul 2025 11:53:30 +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: Thu, 24 Jul 2025 09:53:37 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 24.07.2025 11:44, Mykyta Poturai wrote:
> On Arm without pci-passthrough=on Xen does not know anything about
> present PCI devices due to PHYSDEVOP_pci_device_add not executing. This
> causes PHYSDEVOP_pci_device_reset to fail when trying to find the device
> that is being reset and return ENODEV.
>
> Add explicit is_pci_passthrough_enabled check to return a more
> meaningful EOPNOTSUPP code.
I.e. just like PHYSDEVOP_pci_device_{add,remove} already have it. Which
also helps ...
> This change should not affect x86 behavior as pci-passthrough is always
> enabled there.
... proving the no-effect aspect for x86 here.
> Signed-off-by: Mykyta Poturai <mykyta_poturai@xxxxxxxx>
Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
However, the subject prefix is entirely misleading. The change helps Arm,
but is in arch-neutral code. Without "physdev" or "physdevop" anywhere in
the subject, whether "pci_device_reset" refers to a function (and you
merely omitted the parentheses) or something else doesn't become clear.
Also, nit: "is_pci_passthrough_enabled()" or "pci-passthrough-enabled" in
the subject, both to correct spelling and to make clear that either you
explicitly mean an existing predicate, or you merely mean to describe that
verbally.
Jan
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