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.