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 kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
