Core Collective QEMU/KVM (nee Simulation) sub-group meeting agenda (Arm Features!)

[Alex Bennée]

Hi All,

Just a reminder that our next meeting is on Wednesday and the agenda was
to see if we could pool interest in Arm specific feature gaps in QEMU.
We could be talking:

- CPU feature emulation
- Hypervisor enlightenments
- Arm platform/board support

Ask around your org's and see if there are any others who use QEMU and
have things they would like to see upstream.

See you all there @ 15:00 BST (UK) on Wednesday.

--
Alex Bennée
Virtualisation Tech Lead @ Linaro

[Alex Bennée]

"Boddu, Sai Pavan" <sai.pav...@amd.com> writes:

> AMD General
>
> HI Alex,
>
> Sorry for the delayed response. I wanted to ask whether it would be
> feasible to implement WFE on Arm. At the moment, we are skipping it,
> which effectively creates a busy-loop kind of situation and appears to
> be contributing to slower emulation performance.

Have you checked out the latest QEMU 11.1:

https://wiki.qemu.org/ChangeLog/11.1

While implementing FEAT_WxFT we also enabled proper modelling of the WFE
behaviour on A-profile (it was already enabled on M-profile). I would
caution not to draw too many parallels between behaviour under emulation
vs real hardware though due to the general efficiency of emulated code.

>
> Regards,
> Sai Pavan