Re: [PATCH v6 10/11] vfio/pci: Add dma-buf export support for MMIO regions

Alex Williamson
2025-11-02T17:12:05Z

On Sun, 2 Nov 2025 17:12:53 +0200
Leon Romanovsky <leon@kernel.org> wrote:
> On Sun, Nov 02, 2025 at 08:01:37AM -0700, Alex Williamson wrote:
> > We don't need the separate loop or flag, and adding it breaks the
> > existing reverse list walk. Thanks,
>
> Do you want me to send v7? I have a feeling that v6 is good to be merged.

Let's hold off, if this ends up being the only fixup I can roll it in.
Thanks,

Alex

> diff --git a/drivers/vfio/pci/vfio_pci_core.c b/drivers/vfio/pci/vfio_pci_core.c
> index 24204893e221..51a3bcc26f8b 100644
> --- a/drivers/vfio/pci/vfio_pci_core.c
> +++ b/drivers/vfio/pci/vfio_pci_core.c
> @@ -2403,7 +2403,6 @@ static int vfio_pci_dev_set_hot_reset(struct vfio_device_set *dev_set,
> struct iommufd_ctx *iommufd_ctx)
> {
> struct vfio_pci_core_device *vdev;
> - bool restore_revoke = false;
> struct pci_dev *pdev;
> int ret;
>
> @@ -2473,7 +2472,6 @@ static int vfio_pci_dev_set_hot_reset(struct vfio_device_set *dev_set,
> }
>
> vfio_pci_dma_buf_move(vdev, true);
> - restore_revoke = true;
> vfio_pci_zap_bars(vdev);
> }
>
> @@ -2501,15 +2499,12 @@ static int vfio_pci_dev_set_hot_reset(struct vfio_device_set *dev_set,
> struct vfio_pci_core_device, vdev.dev_set_list);
>
> err_undo:
> - if (restore_revoke) {
> - list_for_each_entry(vdev, &dev_set->device_list, vdev.dev_set_list)
> - if (__vfio_pci_memory_enabled(vdev))
> - vfio_pci_dma_buf_move(vdev, false);
> - }
> -
> list_for_each_entry_from_reverse(vdev, &dev_set->device_list,
> - vdev.dev_set_list)
> + vdev.dev_set_list) {
> + if (__vfio_pci_memory_enabled(vdev))
> + vfio_pci_dma_buf_move(vdev, false);
> up_write(&vdev->memory_lock);
> + }
>
> list_for_each_entry(vdev, &dev_set->device_list, vdev.dev_set_list)
> pm_runtime_put(&vdev->pdev->dev);
>
>
> >
> > Alex
> >
>