Hi Lilit, +cc kvmarm mailing list, get_maintainer is your friend :) On Wed, Sep 18, 2024 at 03:27:59PM +0000, Lilit Janpoladyan wrote: > An example of a device that tracks accesses to stage-2 translations and will > implement page_tracking_device interface is AWS Graviton Page Tracking Agent > (PTA). We'll be posting code for the Graviton PTA device driver in a separate > series of patches. In order to actually review these patches, we need to see an implementation of such a page tracking device. Otherwise it's hard to tell that the interface accomplishes the right abstractions. Beyond that, I have some reservations about maintaining support for features that cannot actually be tested outside of your own environment. > When ARM architectural solution (FEAT_HDBSS feature) is available, we intend to > use it via the same interface most likely with adaptations. Will the PTA stuff eventually get retired once you get support for FEAT_HDBSS in hardware? I think the best way forward here is to implement the architecture, and hopefully after that your legacy driver can be made to fit the interface. The FVP implements FEAT_HDBSS, so there's some (slow) reference hardware to test against. This is a very interesting feature, so hopefully we can move towards something workable. -- Thanks, Oliver
