linux-kernel - Re: [PATCH 3/4] KVM: MMU: track dirty page in speculative path properly

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <4C3D11C6.4000101@cn.fujitsu.com>
Date:	Wed, 14 Jul 2010 09:24:22 +0800
From:	Xiao Guangrong <xiaoguangrong@...fujitsu.com>
To:	Marcelo Tosatti <mtosatti@...hat.com>
CC:	Avi Kivity <avi@...hat.com>, LKML <linux-kernel@...r.kernel.org>,
	KVM list <kvm@...r.kernel.org>
Subject: Re: [PATCH 3/4] KVM: MMU: track dirty page in speculative path properly



Marcelo Tosatti wrote:
> On Tue, Jul 13, 2010 at 05:45:27PM +0800, Xiao Guangrong wrote:
>> In speculative path, the page is not real write-access, no need mark it
>> dirty, so clear dirty bit in this path and later examine this bit when
>> we release the page
>>
>> Signed-off-by: Xiao Guangrong <xiaoguangrong@...fujitsu.com>
>> ---
>>  arch/x86/kvm/mmu.c |   24 +++++++++++-------------
>>  1 files changed, 11 insertions(+), 13 deletions(-)
> 
> Unfortunately all pages that kvm creates translations for are marked
> dirty due to get_user_pages(w=1), except KSM which makes them read-only
> later.

Marcelo, i have looked into get_user_pages() function, but not catch where
to make page dirty, could you point it out for me? :-)
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/