Re: [PATCH 1/2] KVM: MMU: don't make direct sp read-only if !map_writable

Avi Kivity
2010-12-13T10:32:21Z

On 12/13/2010 12:31 PM, Xiao Guangrong wrote:
> Currently, if the page is not allowed to write, then it can drop
> ACC_WRITE_MASK in pte_access, and the direct sp's access is:
> gw->pt_access& gw->pte_access
> so, it also removes the write access in the direct sp.
>
> There is a problem: if the access of those pages which map thought the same
> mapping in guest is different in host, it causes host switch direct sp very
> frequently.

I just sent a patch to fix this in a different way, please review it.

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