On 02/20/2013 04:06 PM, [email protected] wrote:
> https://bugzilla.kernel.org/show_bug.cgi?id=54061
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> --- Comment #2 from Jay Ren <[email protected]> 2013-02-20 08:06:16 ---
> Marcleo,
>
> yes, after reverting that commit "caf6900f2d8", live-migration can work fine.
>
Sorry for the wrong patch and the bug is: the fast page fault path
can make large-spte writeable without probably set dirty bitmap for
all small pages.
Two ways to fix these:
1): covert the large-spte to small sptes and wirte-protect them, then
no readonly large-spte exists.
2): only allow fast page fault to fix #PF on small spte.
Seems the first way is better because the second way can cause useless
page table waking.
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