linux-kernel - RE: [PATCH v3 2/3] xen/privcmd: Mark pages as dirty

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Message-ID: <003901d658ec$e2d93460$a88b9d20$@xen.org>
Date:   Mon, 13 Jul 2020 09:09:08 +0100
From:   Paul Durrant <xadimgnik@...il.com>
To:     "'Souptick Joarder'" <jrdr.linux@...il.com>,
        <boris.ostrovsky@...cle.com>, <jgross@...e.com>,
        <sstabellini@...nel.org>
Cc:     <xen-devel@...ts.xenproject.org>, <linux-kernel@...r.kernel.org>,
        "'John Hubbard'" <jhubbard@...dia.com>,
        "'Paul Durrant'" <xadimgnik@...il.com>
Subject: RE: [PATCH v3 2/3] xen/privcmd: Mark pages as dirty

> -----Original Message-----
> From: Souptick Joarder <jrdr.linux@...il.com>
> Sent: 12 July 2020 04:40
> To: boris.ostrovsky@...cle.com; jgross@...e.com; sstabellini@...nel.org
> Cc: xen-devel@...ts.xenproject.org; linux-kernel@...r.kernel.org; Souptick Joarder
> <jrdr.linux@...il.com>; John Hubbard <jhubbard@...dia.com>; Paul Durrant <xadimgnik@...il.com>
> Subject: [PATCH v3 2/3] xen/privcmd: Mark pages as dirty
> 
> pages need to be marked as dirty before unpinned it in
> unlock_pages() which was oversight. This is fixed now.
> 
> Signed-off-by: Souptick Joarder <jrdr.linux@...il.com>
> Suggested-by: John Hubbard <jhubbard@...dia.com>
> Reviewed-by: Juergen Gross <jgross@...e.com>
> Cc: John Hubbard <jhubbard@...dia.com>
> Cc: Boris Ostrovsky <boris.ostrovsky@...cle.com>
> Cc: Paul Durrant <xadimgnik@...il.com>

Reviewed-by: Paul Durrant <paul@....org>

> ---
>  drivers/xen/privcmd.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/xen/privcmd.c b/drivers/xen/privcmd.c
> index b001673..079d35b 100644
> --- a/drivers/xen/privcmd.c
> +++ b/drivers/xen/privcmd.c
> @@ -611,8 +611,11 @@ static void unlock_pages(struct page *pages[], unsigned int nr_pages)
>  {
>  	unsigned int i;
> 
> -	for (i = 0; i < nr_pages; i++)
> +	for (i = 0; i < nr_pages; i++) {
> +		if (!PageDirty(pages[i]))
> +			set_page_dirty_lock(pages[i]);
>  		put_page(pages[i]);
> +	}
>  }
> 
>  static long privcmd_ioctl_dm_op(struct file *file, void __user *udata)
> --
> 1.9.1