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Re: [PATCH v3 11/11] xen/arm: Translate virtual PCI bus topology for guests
- To: Oleksandr Andrushchenko <andr2000@xxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Thu, 30 Sep 2021 10:53:35 +0200
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- Cc: julien@xxxxxxx, sstabellini@xxxxxxxxxx, oleksandr_tyshchenko@xxxxxxxx, volodymyr_babchuk@xxxxxxxx, Artem_Mygaiev@xxxxxxxx, roger.pau@xxxxxxxxxx, bertrand.marquis@xxxxxxx, rahul.singh@xxxxxxx, Oleksandr Andrushchenko <oleksandr_andrushchenko@xxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Thu, 30 Sep 2021 08:53:46 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 30.09.2021 09:52, Oleksandr Andrushchenko wrote:
> --- a/xen/drivers/passthrough/pci.c
> +++ b/xen/drivers/passthrough/pci.c
> @@ -889,6 +889,31 @@ int pci_remove_virtual_device(struct domain *d, const
> struct pci_dev *pdev)
> xfree(vdev);
> return 0;
> }
> +
> +/*
> + * Find the physical device which is mapped to the virtual device
> + * and translate virtual SBDF to the physical one.
> + */
> +bool pci_translate_virtual_device(const struct domain *d, pci_sbdf_t *sbdf)
> +{
> + struct vpci_dev *vdev;
const (afaict)
> + bool found = false;
> +
> + pcidevs_lock();
> + list_for_each_entry ( vdev, &d->vdev_list, list )
> + {
> + if ( vdev->sbdf.sbdf == sbdf->sbdf )
> + {
> + /* Replace virtual SBDF with the physical one. */
> + *sbdf = vdev->pdev->sbdf;
> + found = true;
> + break;
> + }
> + }
> + pcidevs_unlock();
As per the comments on the earlier patch, locking as well as placement
may need reconsidering.
Jan
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