On Mon, Nov 05, 2012 at 05:59:26PM +0800, Xiao Guangrong wrote: > Do not drop large spte until it can be insteaded by small pages so that > the guest can happliy read memory through it > > The idea is from Avi: > | As I mentioned before, write-protecting a large spte is a good idea, > | since it moves some work from protect-time to fault-time, so it reduces > | jitter. This removes the need for the return value. > > Signed-off-by: Xiao Guangrong <xiaoguangrong@xxxxxxxxxxxxxxxxxx> > --- > arch/x86/kvm/mmu.c | 34 +++++++++------------------------- > 1 files changed, 9 insertions(+), 25 deletions(-) Its likely that other 4k pages are mapped read-write in the 2mb range covered by a read-only 2mb map. Therefore its not entirely useful to map read-only. Can you measure an improvement with this change? -- 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
