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Re: [PATCH v11 6/7] xen/arm: enable dom0 to use PCI devices with pci-passthrough=no
- To: Mykyta Poturai <Mykyta_Poturai@xxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Wed, 4 Jun 2025 07:52:39 +0200
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- Cc: Stewart Hildebrand <stewart.hildebrand@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Bertrand Marquis <bertrand.marquis@xxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Anthony PERARD <anthony.perard@xxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- Delivery-date: Wed, 04 Jun 2025 05:53:07 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 03.06.2025 15:31, Mykyta Poturai wrote:
> On 02.06.25 11:11, Jan Beulich wrote:
>> On 28.05.2025 11:12, Mykyta Poturai wrote:
>>> From: Stewart Hildebrand <stewart.hildebrand@xxxxxxx>
>>>
>>> Enable the use of IOMMU + PCI in dom0 without having to specify
>>> "pci-passthrough=yes". Due to possible platform specific dependencies
>>> of the PCI host, we rely on dom0 to initialize it and perform
>>> a PHYSDEVOP_pci_device_add/remove call to add each device to SMMU.
>>> PHYSDEVOP_pci_device_reset is left untouched as it does not have the
>>> pci_passthrough_enabled check.
>>
>> Just to re-raise the question here: Is this actually correct?
>
> I'm afraid I don't quite understand your concerns here.
>
> The purpose of this patch is to relax the pci_passthrough_enabled checks
> and make PCI physdev ops work with passthrough disabled.
> The reset op worked independently of PCI passthrough being on or off and
> will continue to do so after this patch.
> If your concerns are about the correctness of allowing reset to always
> work, you specifically requested this behavior in the patches
> implementing it here[1].
Right, yet even there I had already asked for possible differing opinions.
Plus the case I had mentioned was specifically Dom0, which fits here.
Jan
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