On Thursday 12 April 2007 17:38, Avi Kivity wrote: > > But wouldn't it also be possible to create a file in > > userspace and pass its descriptor to kvm? [...] > swap, hugetlbfs, and maybe other nifty stuff. I think I know how to do > this for the current mmu, but I'm worried that it will have a > performance impact with the nested page tables mmu.
Another thing to consider is the commit "mm: tracking shared dirty pages" (d08b3851da41d0ee60851f2c75b118e1f7a5fc89). We need a shared mapping to actually have guest memory written back to the file. The dirty page tracking change will cause the host kernel to write protect guest memory pages after writeback. This will often trigger guest exits due to host protection faults. If we want to have file backed guest memory we really should modify the VMA to be not eligible for dirty page tracking. Christian ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys-and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV _______________________________________________ kvm-devel mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/kvm-devel
