On Wed, Feb 01, 2017 at 03:56:36PM +1100, David Gibson wrote:

On Wed, Feb 01, 2017 at 09:18:13AM +1100, Paul Mackerras wrote:

quoted

On Tue, Dec 20, 2016 at 04:48:56PM +1100, David Gibson wrote:

quoted

Here is the KVM implementation for the proposed PAPR extension which
allows the runtime resizing of a PAPR guest's Hashed Page Table (HPT).

Using this requires a guest kernel with support for the extension.
Patches for guest side support in Linux were posted earlier:
  https://lists.ozlabs.org/pipermail/linuxppc-dev/2016-December/152164.html

It also requires userspace (i.e. qemu) to intercept the HPT resizing
hypercalls and invoke the KVM ioctl()s to implement them.  This is
done instead of having KVM direclty intercept the hypercalls, so that
userspace can, if useful, impose additional restrictions on resizes:
for example it could refuse them entirely if policy for the VM
precludes resizing, or it could limit the size of HPT the guest can
request to meet resource limits.

Patches to implement the userspace part of HPT resizing are proposed
for qemu-2.9, and can be found at:
  https://github.com/dgibson/qemu/tree/hpt-resize

I'm posting these now, in the hopes that both these and the
corresponding guest side patches can be staged and merged for the 4.11
window.

Thanks, series applied to my kvm-ppc-next branch.

Great.  Where can I grab that tree?

git://git.kernel.org/pub/scm/linux/kernel/git/paulus/powerpc

quoted

Next time, please cc kvm-ppc@vger.kernel.org so I shows up in
patchwork and I don't miss it.

Sorry, I hadn't realized that list existed.  Noted for future
reference.

Thanks,
Paul.