linux-kernel - Re: [PATCH] xen: switch gnttab_end_foreign_access() to take a struct page pointer

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Date:   Tue, 24 May 2022 14:47:50 +0200
From:   Jan Beulich <jbeulich@...e.com>
To:     Juergen Gross <jgross@...e.com>
Cc:     Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Stefano Stabellini <sstabellini@...nel.org>,
        Roger Pau Monné <roger.pau@...rix.com>,
        Jens Axboe <axboe@...nel.dk>,
        Dmitry Torokhov <dmitry.torokhov@...il.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Eric Van Hensbergen <ericvh@...il.com>,
        Latchesar Ionkov <lucho@...kov.net>,
        Dominique Martinet <asmadeus@...ewreck.org>,
        Christian Schoenebeck <linux_oss@...debyte.com>,
        xen-devel@...ts.xenproject.org, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-input@...r.kernel.org,
        netdev@...r.kernel.org, v9fs-developer@...ts.sourceforge.net
Subject: Re: [PATCH] xen: switch gnttab_end_foreign_access() to take a struct
 page pointer

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

Reviewed-by: Jan Beulich <jbeulich@...e.com>