On Fri, Oct 09, 2026 at 07:13:31PM +0000, Popov, Pavel E wrote: > Leon, > > Understood on all points, and I agree HMAT is the proper fix. We discussed > it with Lukas Wunner as well. Exposing HMAT is on the hypervisor side; Jim > Chow from VMware can speak to their plans. Even once HMAT lands in Linux, > it only helps guests after the hypervisors add support for it. > > The key point for us is that today there is no path at all for > passthrough devices on VMware or Hyper-V, and that is what this patch > addresses. We reviewed it with VMware and aligned on this approach for the > guest in the meantime.
This does not change the fact that the patch causes unpredictable behavior for P2P devices in the guest. Sometimes it works; other times, devices that previously worked may be classified as P2P-capable and will stop. > > Is there anything you would recommend to make the series acceptable as an > interim? Help Lukas and Mahesh succeed in their work. Thanks
