[PATCH v5 0/4] KVM: arm64: Errata management for VM Live migration

[Sebastian Ott]

Hey,

On Fri, 24 Jan 2025, Shameer Kolothum wrote:
> 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?

Thanks,
Sebastian