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    SubjectRe: [PATCH 02/11] KVM: x86: tag the instructions which are used to write page table
    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?

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