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Date: Sun, 18 Jul 2010 18:14:11 +0300 From: Avi Kivity <avi@...hat.com> To: Gleb Natapov <gleb@...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 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 - read faults: instantiate a readable spte; if likely(page is writeable), make it a writeable spte; if likely(page is dirty) make it a dirty spte - speculative spte instantiations: if likely(page is present) instantiate a pte; if accessed, mark it accessed, if writeable, mark it writeable; if dirty, mark it dirty -- error compiling committee.c: too many arguments to function -- 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/
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