On Sun, Jan 29, 2023 at 10:51 AM Longpeng(Mike) <longpeng2@xxxxxxxxxx> wrote:
>
> From: Longpeng <longpeng2@xxxxxxxxxx>
>
> Adds get_vq_notification_pgprot operation to vdpa_config_ops to support
> specify the pgprot of vq norification area. It's an optional operation,
> the vdpa framework will treat the pgprot of vq notification area as
> noncached as default as usual.
Missing sob.
Other than this.
Acked-by: Jason Wang <jasowang@xxxxxxxxxx>
Thanks
> ---
> drivers/vhost/vdpa.c | 4 +++-
> include/linux/vdpa.h | 9 +++++++++
> 2 files changed, 12 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c
> index 166044642fd5..036fe88425c8 100644
> --- a/drivers/vhost/vdpa.c
> +++ b/drivers/vhost/vdpa.c
> @@ -1263,7 +1263,9 @@ static vm_fault_t vhost_vdpa_fault(struct vm_fault *vmf)
>
> notify = ops->get_vq_notification(vdpa, index);
>
> - vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
> + vma->vm_page_prot = ops->get_vq_notification_pgprot ?
> + ops->get_vq_notification_pgprot(vdpa, index, vma->vm_page_prot) :
> + pgprot_noncached(vma->vm_page_prot);
> if (remap_pfn_range(vma, vmf->address & PAGE_MASK,
> PFN_DOWN(notify.addr), PAGE_SIZE,
> vma->vm_page_prot))
> diff --git a/include/linux/vdpa.h b/include/linux/vdpa.h
> index 6d0f5e4e82c2..07fcf5e6abc8 100644
> --- a/include/linux/vdpa.h
> +++ b/include/linux/vdpa.h
> @@ -169,6 +169,12 @@ struct vdpa_map_file {
> * @vdev: vdpa device
> * @idx: virtqueue index
> * Returns the notifcation area
> + * @get_vq_notification_pgprot: Get the pgprot of the vq's notification area (optional)
> + * @vdev: vdpa device
> + * @idx: virtqueue index
> + * @prot: original page protection value of the
> + * notification area
> + * Returns pgprot_t: the pgprot of the notification area
> * @get_vq_irq: Get the irq number of a virtqueue (optional,
> * but must implemented if require vq irq offloading)
> * @vdev: vdpa device
> @@ -305,6 +311,9 @@ struct vdpa_config_ops {
> struct netlink_ext_ack *extack);
> struct vdpa_notification_area
> (*get_vq_notification)(struct vdpa_device *vdev, u16 idx);
> + pgprot_t (*get_vq_notification_pgprot)(struct vdpa_device *vdev,
> + u16 idx,
> + pgprot_t prot);
> /* vq irq is not expected to be changed once DRIVER_OK is set */
> int (*get_vq_irq)(struct vdpa_device *vdev, u16 idx);
>
> --
> 2.23.0
>
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