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From: Brice Goglin <>
To: Nikolaus Rath <>
Cc: LKML <>
Subject: Re: virt_to_page for userspace pointers
Date: Sat, 05 Feb 2011 22:36:22 +0100	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>

Le 05/02/2011 22:04, Nikolaus Rath a écrit :
> Nikolaus Rath <> 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()).


  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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