Re: [PATCH v2 0/6] KVM: arm64: emulation for CTR_EL0

From: Sebastian Ott
Date: Fri May 03 2024 - 07:02:26 EST


Hi Oliver,

On Wed, 1 May 2024, Oliver Upton wrote:
On Fri, Apr 26, 2024 at 12:49:44PM +0200, Sebastian Ott wrote:
Hej folks,

I'm looking into supporting migration between 2 Ampere Altra (Max)
machines (using Neoverse-N1). They are almost identical regarding
their feature id register state except for CTR_EL0.DIC which is set
on one machine but not the other.

CTR_EL0 is currently marked as invariant and migrating a VM between
those 2 machines using qemu fails.

I left some feedback on the series, but in addition to that would it be
possible to augment the set_id_regs selftest to exercise the CTR_EL0
mutability?

Yes, sure!

Thanks,
Sebastian