From: Avi Kivity <avi@redhat.com>
To: Jeremy Fitzhardinge <jeremy@goop.org>
Cc: Nick Piggin <nickpiggin@yahoo.com.au>,
Hugh Dickens <hugh@veritas.com>,
Linux Memory Management List <linux-mm@kvack.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Avi Kivity <avi@qumranet.com>,
Andrew Morton <akpm@linux-foundation.org>,
Rik van Riel <riel@redhat.com>
Subject: Re: Populating multiple ptes at fault time
Date: Wed, 17 Sep 2008 15:02:29 -0700 [thread overview]
Message-ID: <48D17E75.80807@redhat.com> (raw)
In-Reply-To: <48D142B2.3040607@goop.org>
Jeremy Fitzhardinge wrote:
> Minor faults are easier; if the page already exists in memory, we should
> just create mappings to it. If neighbouring pages are also already
> present, then we can can cheaply create mappings for them too.
>
>
One problem is the accessed bit. If it's unset, the shadow code cannot
make the pte present (since it has to trap in order to set the accessed
bit); if it's set, we're lying to the vm.
This doesn't affect Xen, only kvm.
--
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.
WARNING: multiple messages have this Message-ID (diff)
From: Avi Kivity <avi@redhat.com>
To: Jeremy Fitzhardinge <jeremy@goop.org>
Cc: Nick Piggin <nickpiggin@yahoo.com.au>,
Hugh Dickens <hugh@veritas.com>,
Linux Memory Management List <linux-mm@kvack.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Avi Kivity <avi@qumranet.com>,
Andrew Morton <akpm@linux-foundation.org>,
Rik van Riel <riel@redhat.com>
Subject: Re: Populating multiple ptes at fault time
Date: Wed, 17 Sep 2008 15:02:29 -0700 [thread overview]
Message-ID: <48D17E75.80807@redhat.com> (raw)
In-Reply-To: <48D142B2.3040607@goop.org>
Jeremy Fitzhardinge wrote:
> Minor faults are easier; if the page already exists in memory, we should
> just create mappings to it. If neighbouring pages are also already
> present, then we can can cheaply create mappings for them too.
>
>
One problem is the accessed bit. If it's unset, the shadow code cannot
make the pte present (since it has to trap in order to set the accessed
bit); if it's set, we're lying to the vm.
This doesn't affect Xen, only kvm.
--
I have a truly marvellous patch that fixes the bug which this
signature is too narrow to contain.
--
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next prev parent reply other threads:[~2008-09-17 22:11 UTC|newest]
Thread overview: 80+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-09-17 17:47 Populating multiple ptes at fault time Jeremy Fitzhardinge
2008-09-17 17:47 ` Jeremy Fitzhardinge
2008-09-17 18:28 ` Rik van Riel
2008-09-17 18:28 ` Rik van Riel
2008-09-17 21:47 ` Jeremy Fitzhardinge
2008-09-17 21:47 ` Jeremy Fitzhardinge
2008-09-17 20:02 ` Chris Snook
2008-09-17 20:02 ` Chris Snook
2008-09-17 21:45 ` Jeremy Fitzhardinge
2008-09-17 21:45 ` Jeremy Fitzhardinge
2008-09-18 18:16 ` Christoph Lameter
2008-09-18 18:16 ` Christoph Lameter
2008-09-18 18:53 ` Jeremy Fitzhardinge
2008-09-18 18:53 ` Jeremy Fitzhardinge
2008-09-18 19:39 ` Christoph Lameter
2008-09-18 19:39 ` Christoph Lameter
2008-09-18 22:21 ` KOSAKI Motohiro
2008-09-18 22:21 ` KOSAKI Motohiro
2008-09-18 20:52 ` Martin Bligh
2008-09-18 20:52 ` Martin Bligh
2008-09-18 20:53 ` Chris Snook
2008-09-18 20:53 ` Chris Snook
2008-09-18 21:11 ` Martin Bligh
2008-09-18 21:11 ` Martin Bligh
2008-09-18 21:13 ` Christoph Lameter
2008-09-18 21:13 ` Christoph Lameter
2008-09-18 21:21 ` Martin Bligh
2008-09-18 21:21 ` Martin Bligh
2008-09-18 21:32 ` Christoph Lameter
2008-09-18 21:32 ` Christoph Lameter
2008-09-18 21:49 ` MinChan Kim
2008-09-18 21:49 ` MinChan Kim
2008-09-18 21:58 ` Christoph Lameter
2008-09-18 21:58 ` Christoph Lameter
2008-09-18 22:08 ` Martin Bligh
2008-09-18 22:08 ` Martin Bligh
2008-09-18 22:11 ` Christoph Lameter
2008-09-18 22:11 ` Christoph Lameter
2008-09-18 22:18 ` Martin Bligh
2008-09-18 22:18 ` Martin Bligh
2008-09-18 22:22 ` Jeremy Fitzhardinge
2008-09-18 22:22 ` Jeremy Fitzhardinge
2008-09-18 22:23 ` Chris Snook
2008-09-18 22:23 ` Chris Snook
2008-09-18 23:16 ` MinChan Kim
2008-09-18 23:16 ` MinChan Kim
2008-09-17 22:02 ` Avi Kivity [this message]
2008-09-17 22:02 ` Avi Kivity
2008-09-17 22:30 ` Jeremy Fitzhardinge
2008-09-17 22:30 ` Jeremy Fitzhardinge
2008-09-17 22:47 ` Avi Kivity
2008-09-17 22:47 ` Avi Kivity
2008-09-17 23:02 ` Jeremy Fitzhardinge
2008-09-17 23:02 ` Jeremy Fitzhardinge
2008-09-18 20:26 ` Avi Kivity
2008-09-18 20:26 ` Avi Kivity
2008-09-18 22:18 ` Jeremy Fitzhardinge
2008-09-18 22:18 ` Jeremy Fitzhardinge
2008-09-18 23:38 ` Avi Kivity
2008-09-18 23:38 ` Avi Kivity
2008-09-19 0:00 ` Jeremy Fitzhardinge
2008-09-19 0:00 ` Jeremy Fitzhardinge
2008-09-19 0:20 ` Avi Kivity
2008-09-19 0:20 ` Avi Kivity
2008-09-19 0:42 ` Jeremy Fitzhardinge
2008-09-19 0:42 ` Jeremy Fitzhardinge
2008-09-24 12:31 ` Avi Kivity
2008-09-24 12:31 ` Avi Kivity
2008-09-25 18:32 ` Jeremy Fitzhardinge
2008-09-25 18:32 ` Jeremy Fitzhardinge
2008-09-26 10:26 ` Martin Schwidefsky
2008-09-26 10:26 ` Martin Schwidefsky
2008-09-19 17:45 ` Benjamin Herrenschmidt
2008-09-19 17:45 ` Benjamin Herrenschmidt
2008-09-17 23:50 ` MinChan Kim
2008-09-17 23:50 ` MinChan Kim
2008-09-18 6:58 ` KOSAKI Motohiro
2008-09-18 6:58 ` KOSAKI Motohiro
2008-09-18 7:26 ` KAMEZAWA Hiroyuki
2008-09-18 7:26 ` KAMEZAWA Hiroyuki
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