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Re: [PATCH v6 2/3] xen/pci: introduce PF<->VF links
- To: Stewart Hildebrand <stewart.hildebrand@xxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Mon, 28 Oct 2024 18:02:35 +0100
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- Cc: Roger Pau Monné <roger.pau@xxxxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Mon, 28 Oct 2024 17:02:41 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 18.10.2024 22:39, Stewart Hildebrand wrote:
> Add links between a VF's struct pci_dev and its associated PF struct
> pci_dev. Move the calls to pci_get_pdev()/pci_add_device() down to avoid
> dropping and re-acquiring the pcidevs_lock().
>
> During PF removal, unlink VF from PF and mark the VF broken. As before,
> VFs may exist without a corresponding PF, although now only with
> pdev->broken = true.
>
> The hardware domain is expected to remove the associated VFs before
> removing the PF. Print a warning in case a PF is removed with associated
> VFs still present.
>
> Signed-off-by: Stewart Hildebrand <stewart.hildebrand@xxxxxxx>
> ---
> Candidate for backport to 4.19 (the next patch depends on this one)
>
> v5->v6:
> * move printk() before ASSERT_UNREACHABLE()
> * warn about PF removal with VFs still present
Hmm, maybe I didn't make this clear enough when commenting on v5: I wasn't
just after an adjustment to the commit message. I'm instead actively
concerned of the resulting behavior. Question is whether we can reasonably
do something about that.
Jan
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