Hey Marc, thanks for the review.
Marc Zyngier <[email protected]> writes:
On Mon, 09 Feb 2026 22:13:55 +0000,
Colton Lewis <[email protected]> wrote:
This series creates a new PMU scheme on ARM, a partitioned PMU that
allows reserving a subset of counters for more direct guest access,
significantly reducing overhead. More details, including performance
benchmarks, can be read in the v1 cover letter linked below.
An overview of what this series accomplishes was presented at KVM
Forum 2025. Slides [1] and video [2] are linked below.
IMPORTANT: This iteration does not yet implement the dynamic counter
reservation approach suggested by Will Deacon in January [3]. I am
working on it, but wanted to send this version first to keep momentum
going and ensure I've addressed all issues besides that.
[...]
As I have asked before, this is missing an example of how userspace is
going to use this. Without it, it is impossible to correctly review
this series.
Please consider this as a blocker.
Understood. I remember you asking for a QEMU patch specifically.
I had hoped that the use in the selftest was sufficient to show how to
use the uAPI. If not, I can send out an example QEMU patch to the QEMU
ARM mailing list.
Thanks,
M.
--
Without deviation from the norm, progress is not possible.
