linux-kernel - Re: [PATCH] xen/virtio: Handle cases when page offset > PAGE

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Message-ID: <090c9202-68ed-a62b-c10a-350e1531bd90@suse.com>
Date:   Fri, 7 Oct 2022 17:10:33 +0200
From:   Juergen Gross <jgross@...e.com>
To:     Oleksandr Tyshchenko <olekstysh@...il.com>,
        xen-devel@...ts.xenproject.org, linux-kernel@...r.kernel.org
Cc:     Oleksandr Tyshchenko <oleksandr_tyshchenko@...m.com>,
        Stefano Stabellini <sstabellini@...nel.org>,
        Xenia Ragiadakou <burzalodowa@...il.com>
Subject: Re: [PATCH] xen/virtio: Handle cases when page offset > PAGE_SIZE
 properly

On 07.10.22 15:27, Oleksandr Tyshchenko wrote:
> From: Oleksandr Tyshchenko <oleksandr_tyshchenko@...m.com>
> 
> Passed to xen_grant_dma_map_page() offset in the page
> can be > PAGE_SIZE even if the guest uses the same page granularity
> as Xen (4KB).
> 
> Before current patch, if such case happened we ended up providing
> grants for the whole region in xen_grant_dma_map_page() which
> was really unnecessary. The more, we ended up not releasing all
> grants which represented that region in xen_grant_dma_unmap_page().
> 
> Current patch updates the code to be able to deal with such cases.
> 
> Signed-off-by: Oleksandr Tyshchenko <oleksandr_tyshchenko@...m.com>

Reviewed-by: Juergen Gross <jgross@...e.com>


Juergen


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