Messages in this thread | | | Subject | Re: [kvm-devel] [PATCH][RFC] pte notifiers -- support for external page tables | From | Rusty Russell <> | Date | Thu, 06 Sep 2007 05:56:23 +1000 |
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On Wed, 2007-09-05 at 22:32 +0300, Avi Kivity wrote: > [resend due to bad alias expansion resulting in some recipients > being bogus] > > Some hardware and software systems maintain page tables outside the normal > Linux page tables, which reference userspace memory. This includes > Infiniband, other RDMA-capable devices, and kvm (with a pending patch).
And lguest. I can't tell until I've actually implemented it, but I think it will seriously reduce the need for page pinning which is why only root can currently launch guests.
My concern is locking: this is called with the page lock held, and I guess we have to bump the guest out if it's currently running.
(Oh, and this means lguest needs to do a reverse mapping somehow, but I'll come up with something).
Cheers, Rusty.
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