Messages in this thread | | | Date | Thu, 01 Apr 2010 12:12:05 +0300 | From | Avi Kivity <> | Subject | Re: [RFC] KVM MMU: thinking of shadow page cache |
| |
On 04/01/2010 12:05 PM, Xiao Guangrong wrote: > >> We've considered this in the past, it makes sense. The big question is >> whether any guests actually map the same page table through PDEs with >> different permissions (mapping the same page table through multiple PDEs >> is very common, but always with the same permissions). Do you know of >> any such guest? >> > I also don't know whether have such guest. > Maybe my idea is no good for current OS, thanks for your comments. >
In fact there are plans to make kvm such a guest (when running in nested mode) - when we perform live migration we write-protect all guest pages, and it's reasonable to use the top-level shadow page to write protect all memory at once instead of iterating over all mmu pages. When that goes in, we should also implement your idea.
-- error compiling committee.c: too many arguments to function
| |