linux-kernel - Re: [PATCH] xen/privcmd: Support correctly 64KB page granularity when mapping memory

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Date:   Wed, 7 Jun 2017 11:25:15 +0200
From:   Juergen Gross <jgross@...e.com>
To:     Julien Grall <julien.grall@....com>, xen-devel@...ts.xen.org
Cc:     sstabellini@...nel.org, boris.ostrovsky@...cle.com,
        linux-kernel@...r.kernel.org, stable@...r.kernel.org,
        Feng Kan <fkan@....com>
Subject: Re: [PATCH] xen/privcmd: Support correctly 64KB page granularity when
 mapping memory

On 31/05/17 15:03, Julien Grall wrote:
> Commit 5995a68 "xen/privcmd: Add support for Linux 64KB page granularity" did
> not go far enough to support 64KB in mmap_batch_fn.
> 
> The variable 'nr' is the number of 4KB chunk to map. However, when Linux
> is using 64KB page granularity the array of pages (vma->vm_private_data)
> contain one page per 64KB. Fix it by incrementing st->index correctly.
> 
> Furthermore, st->va is not correctly incremented as PAGE_SIZE !=
> XEN_PAGE_SIZE.
> 
> Fixes: 5995a68 ("xen/privcmd: Add support for Linux 64KB page granularity")
> CC: stable@...r.kernel.org
> Reported-by: Feng Kan <fkan@....com>
> Signed-off-by: Julien Grall <julien.grall@....com>

Committed to xen.tip for-linus-4.12b


Juergen