linux-kernel - Re: [PATCH v2 0/6] KVM: arm64: emulation for CTR

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Message-ID: <ZjH6mgJa-ilmPu95@linux.dev>
Date: Wed, 1 May 2024 08:17:30 +0000
From: Oliver Upton <oliver.upton@...ux.dev>
To: Sebastian Ott <sebott@...hat.com>
Cc: linux-arm-kernel@...ts.infradead.org, kvmarm@...ts.linux.dev,
	linux-kernel@...r.kernel.org, Marc Zyngier <maz@...nel.org>,
	James Morse <james.morse@....com>,
	Suzuki K Poulose <suzuki.poulose@....com>,
	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will@...nel.org>
Subject: Re: [PATCH v2 0/6] KVM: arm64: emulation for CTR_EL0

Hi Sebastian,

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?

-- 
Thanks,
Oliver