From: Brice Goglin <Brice.Goglin@ens-lyon.org>
To: Nikolaus Rath <Nikolaus@rath.org>
Cc: LKML <linux-kernel@vger.kernel.org>
Subject: Re: virt_to_page for userspace pointers
Date: Sat, 05 Feb 2011 22:36:22 +0100 [thread overview]
Message-ID: <4D4DC2D6.8030905@ens-lyon.org> (raw)
In-Reply-To: <878vxuxkfr.fsf@inspiron.ap.columbia.edu>
Le 05/02/2011 22:04, Nikolaus Rath a écrit :
> Nikolaus Rath <Nikolaus@rath.org> writes:
>
>> Is there a way that my own kernel module can "reverse" this mmap call?
>> I.e. given the userspace pointer, how do I get access to the physical
>> location of the memory that has been mapped?
>>
> Ok, after some studying I think I can ask the question in a better way:
>
> Is there an equivalent function to virt_to_page (and virt_to_phys) that
> works with userspace pointers? Or do I have to manually walk through the
> page tables? In the later case, are there any examples of this kind of
> search that I could use as a basis?
>
You probably want get_user_pages() (or get_user_pages_fast()).
Brice
next prev parent reply other threads:[~2011-02-05 21:46 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-02-03 20:50 Reversing a memory mapping? Nikolaus Rath
2011-02-05 21:04 ` virt_to_page for userspace pointers (was: Reversing a memory mapping?) Nikolaus Rath
2011-02-05 21:36 ` Brice Goglin [this message]
2011-02-13 20:24 ` virt_to_page for userspace pointers Nikolaus Rath
2011-02-13 20:37 ` Brice Goglin
2011-02-13 21:56 ` Nikolaus Rath
2011-02-13 22:06 ` Alan Cox
2011-02-13 22:11 ` Nikolaus Rath
2011-02-14 22:46 ` Nikolaus Rath
2011-07-26 12:03 ` Alexey Skidanov
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