Rusty Russell wrote:
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.
Ah yes, lguest.
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.
This will complicate kvm's locking too. We usually take kvm->lock to do
mmu ops, but that is now a mutex.
--
Any sufficiently difficult bug is indistinguishable from a feature.
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