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
| ||
|
Date: Sun, 18 Jul 2010 18:23:21 +0300 From: Gleb Natapov <gleb@...hat.com> To: Avi Kivity <avi@...hat.com> Cc: Marcelo Tosatti <mtosatti@...hat.com>, Lai Jiangshan <laijs@...fujitsu.com>, LKML <linux-kernel@...r.kernel.org>, kvm@...r.kernel.org, Nick Piggin <npiggin@...e.de> Subject: Re: [PATCH 5/6] kvm, x86: use ro page and don't copy shared page On Sun, Jul 18, 2010 at 06:14:11PM +0300, Avi Kivity wrote: > On 07/17/2010 07:31 AM, Gleb Natapov wrote: > >>> > >>>Currently pages allocated for guest memory are required to be RW, so after your series > >>>behaviour will remain exactly the same as before. > >>Except KSM pages. > >> > >KSM page will be COWed by __get_user_pages_fast(addr, 1, 1, page) in > >get_user_page_and_protection() just like it COWed now, no? > > Well, we don't want to COW it on write faults. > > The optimal behaviour is: > > - write faults: COW and instantiate a writeable spte So do we or don't we want to COW on write faults? -- Gleb. -- 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/
Powered by blists - more mailing lists