Re: [PATCH v2 10/16] KVM: MMU: fask check whether page is writable

From: Xiao Guangrong
Date: Mon Apr 16 2012 - 23:56:24 EST

On 04/16/2012 07:47 PM, Avi Kivity wrote:

> On 04/16/2012 01:20 PM, Xiao Guangrong wrote:
>>>> It is used to avoid the unnecessary overload
>>> It's overloading me :(
>> Sorry.
> The trick is to send those in separate patchset so the maintainer
> doesn't notice.

Thanks for your suggestion, i will pay more attention on it in the

For this patch, what did you mean of "those"? You mean the whole
rmap.PTE_LIST_WP_BIT (fast check for shadow page table write protection
and host write protection) or just about host_page_write_protect
(for KSM only)?

If we do not have rmap.PTE_LIST_WP_BIT, there may have regression on
shadow mmu.

Hmm, do i need implement rmap.PTE_LIST_WP_BIT, then fast page fault?

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