Re: [PATCH 1/2] xen/gntdev.c: Mark pages as dirty

[boris.ostrovsky@xxxxxxxxxx]

On 9/6/20 2:51 AM, Souptick Joarder wrote:
> There seems to be a bug in the original code when gntdev_get_page()
> is called with writeable=true then the page needs to be marked dirty
> before being put.
>
> To address this, a bool writeable is added in gnt_dev_copy_batch, set
> it in gntdev_grant_copy_seg() (and drop `writeable` argument to
> gntdev_get_page()) and then, based on batch->writeable, use
> set_page_dirty_lock().
>
> Fixes: a4cdb556cae0 (xen/gntdev: add ioctl for grant copy)
> Suggested-by: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>
> Signed-off-by: Souptick Joarder <jrdr.linux@xxxxxxxxx>
> Cc: John Hubbard <jhubbard@xxxxxxxxxx>
> Cc: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>
> Cc: Juergen Gross <jgross@xxxxxxxx>
> Cc: David Vrabel <david.vrabel@xxxxxxxxxx>


Cc: stable@xxxxxxxxxxxxxxx

(can be added at commit time)

Reviewed-by: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>