Messages in this thread | | | Date | Mon, 22 Aug 2011 17:36:37 +0300 | From | Avi Kivity <> | Subject | Re: [PATCH 02/11] KVM: x86: tag the instructions which are used to write page table |
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On 08/22/2011 05:32 PM, Marcelo Tosatti wrote: > On Tue, Aug 16, 2011 at 02:41:27PM +0800, Xiao Guangrong wrote: > > The idea is from Avi: > > | tag instructions that are typically used to modify the page tables, and > > | drop shadow if any other instruction is used. > > | The list would include, I'd guess, and, or, bts, btc, mov, xchg, cmpxchg, > > | and cmpxchg8b. > > > > This patch is used to tag the instructions and in the later path, shadow page > > is dropped if it is written by other instructions > > What is the advantage of doing this again? What is the point of > dropping shadow if the instruction is emulated? >
So it won't be emulated again; the assumption is that if you addl into a page, it isn't a pagetable.
-- error compiling committee.c: too many arguments to function
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