On Tue, 04 Feb 2025 16:45:38 +0000,
Sebastian Ott [off-list ref] wrote:

Hey,

On Fri, 24 Jan 2025, Shameer Kolothum wrote:

quoted

On ARM64 platforms most of the errata workarounds are based on CPU
MIDR/REVIDR values and a number of these workarounds need to be
implemented by the Guest kernel as well. This creates a problem when
Guest needs to be migrated to a platform that differs in these
MIDR/REVIDR values even if the VMM can come up with a common minimum
feature list for the Guest using the recently introduced "Writable
ID registers" support.

Currently MIDR/REVIDR are still RO and guest access is not trapped - so
even with the errata management patches in place the guest state would
change and a migration (between hosts that differ in these regs) would
not be possible. Are there any plans to allow to actually change these?

Sure thing. We only need a victim! :)

	M.

-- 
Without deviation from the norm, progress is not possible.