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Re: [PATCH v4] x86/msi: fix locking for SR-IOV devices
- To: Stewart Hildebrand <stewart.hildebrand@xxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Mon, 23 Sep 2024 09:23:19 +0200
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Teddy Astie <teddy.astie@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Mon, 23 Sep 2024 07:23:17 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 18.09.2024 16:11, Stewart Hildebrand wrote:
> On 8/28/24 06:36, Jan Beulich wrote:
>> On 27.08.2024 05:59, Stewart Hildebrand wrote:
>>> + list_for_each_entry_safe(vf_pdev, tmp,
>>> &pdev->physfn.vf_list,
>>> + virtfn.entry)
>>> + ret = pci_remove_device(vf_pdev->sbdf.seg,
>>> + vf_pdev->sbdf.bus,
>>> + vf_pdev->sbdf.devfn) ?: ret;
>>
>> And if this fails, the VF will still remain orphaned. I think in the
>> model I had suggested no such risk would exist.
>
> Are you referring to your suggestion "to refuse the request (in
> pci_remove_device()) when the list isn't empty" ? [1] Or something else?
>
> [1]
> https://lore.kernel.org/xen-devel/74f88a45-a632-4ca6-9cee-95f52370b397@xxxxxxxx/
It's been a while, but yes, I think that's the one.
Jan
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