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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