From: Rusty Russell <rusty@rustcorp.com.au>
To: Avi Kivity <avi@qumranet.com>
Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org,
kvm-devel@lists.sourceforge.net, general@lists.openfabrics.org
Subject: Re: [kvm-devel] [PATCH][RFC] pte notifiers -- support for external page tables
Date: Thu, 06 Sep 2007 05:56:23 +1000 [thread overview]
Message-ID: <1189022183.10802.184.camel@localhost.localdomain> (raw)
In-Reply-To: <11890207643068-git-send-email-avi@qumranet.com>
On Wed, 2007-09-05 at 22:32 +0300, Avi Kivity wrote:
> [resend due to bad alias expansion resulting in some recipients
> being bogus]
>
> Some hardware and software systems maintain page tables outside the normal
> Linux page tables, which reference userspace memory. This includes
> Infiniband, other RDMA-capable devices, and kvm (with a pending patch).
And lguest. I can't tell until I've actually implemented it, but I
think it will seriously reduce the need for page pinning which is why
only root can currently launch guests.
My concern is locking: this is called with the page lock held, and I
guess we have to bump the guest out if it's currently running.
(Oh, and this means lguest needs to do a reverse mapping somehow, but
I'll come up with something).
Cheers,
Rusty.
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next prev parent reply other threads:[~2007-09-05 19:56 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-09-05 19:32 [PATCH][RFC] pte notifiers -- support for external page tables Avi Kivity
2007-09-05 19:56 ` Rusty Russell [this message]
2007-09-05 20:17 ` [kvm-devel] " Avi Kivity
2007-09-06 4:28 ` Shaohua Li
2007-09-06 8:38 ` Avi Kivity
2007-09-06 13:28 ` Andi Kleen
[not found] ` <p73myw09g5w.fsf@bingen.suse.de>
2007-09-06 15:17 ` Avi Kivity
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