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Re: [PATCH] xen: switch gnttab_end_foreign_access() to take a struct page pointer
- To: Juergen Gross <jgross@xxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Tue, 24 May 2022 14:47:50 +0200
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- Cc: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Jens Axboe <axboe@xxxxxxxxx>, Dmitry Torokhov <dmitry.torokhov@xxxxxxxxx>, "David S. Miller" <davem@xxxxxxxxxxxxx>, Eric Dumazet <edumazet@xxxxxxxxxx>, Jakub Kicinski <kuba@xxxxxxxxxx>, Paolo Abeni <pabeni@xxxxxxxxxx>, Eric Van Hensbergen <ericvh@xxxxxxxxx>, Latchesar Ionkov <lucho@xxxxxxxxxx>, Dominique Martinet <asmadeus@xxxxxxxxxxxxx>, Christian Schoenebeck <linux_oss@xxxxxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx, linux-block@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, linux-input@xxxxxxxxxxxxxxx, netdev@xxxxxxxxxxxxxxx, v9fs-developer@xxxxxxxxxxxxxxxxxxxxx
- Delivery-date: Tue, 24 May 2022 12:48:05 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 24.05.2022 14:41, Juergen Gross wrote:
> Instead of a virtual kernel address use a pointer of the associated
> struct page as second parameter of gnttab_end_foreign_access().
>
> Most users have that pointer available already and are creating the
> virtual address from it, risking problems in case the memory is
> located in highmem.
>
> gnttab_end_foreign_access() itself won't need to get the struct page
> from the address again.
>
> Suggested-by: Jan Beulich <jbeulich@xxxxxxxx>
> Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
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