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From: Oliver Upton <oliver.upton@linux.dev>
To: Sebastian Ott <sebott@redhat.com>
Cc: linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev,
	linux-kernel@vger.kernel.org, Marc Zyngier <maz@kernel.org>,
	James Morse <james.morse@arm.com>,
	Suzuki K Poulose <suzuki.poulose@arm.com>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Will Deacon <will@kernel.org>
Subject: Re: [PATCH v2 0/6] KVM: arm64: emulation for CTR_EL0
Date: Wed, 1 May 2024 08:17:30 +0000	[thread overview]
Message-ID: <ZjH6mgJa-ilmPu95@linux.dev> (raw)
In-Reply-To: <20240426104950.7382-1-sebott@redhat.com>

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

WARNING: multiple messages have this Message-ID (diff)
From: Oliver Upton <oliver.upton@linux.dev>
To: Sebastian Ott <sebott@redhat.com>
Cc: linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev,
	linux-kernel@vger.kernel.org, Marc Zyngier <maz@kernel.org>,
	James Morse <james.morse@arm.com>,
	Suzuki K Poulose <suzuki.poulose@arm.com>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Will Deacon <will@kernel.org>
Subject: Re: [PATCH v2 0/6] KVM: arm64: emulation for CTR_EL0
Date: Wed, 1 May 2024 08:17:30 +0000	[thread overview]
Message-ID: <ZjH6mgJa-ilmPu95@linux.dev> (raw)
In-Reply-To: <20240426104950.7382-1-sebott@redhat.com>

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

_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

  parent reply	other threads:[~2024-05-01  8:17 UTC|newest]

Thread overview: 36+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2024-04-26 10:49 [PATCH v2 0/6] KVM: arm64: emulation for CTR_EL0 Sebastian Ott
2024-04-26 10:49 ` Sebastian Ott
2024-04-26 10:49 ` [PATCH v2 1/6] KVM: arm64: change return value in arm64_check_features() Sebastian Ott
2024-04-26 10:49   ` Sebastian Ott
2024-04-26 10:49 ` [PATCH v2 2/6] KVM: arm64: unify trap setup code Sebastian Ott
2024-04-26 10:49   ` Sebastian Ott
2024-05-01  6:51   ` Oliver Upton
2024-05-01  6:51     ` Oliver Upton
2024-05-03 15:06     ` Sebastian Ott
2024-05-03 15:06       ` Sebastian Ott
2024-04-26 10:49 ` [PATCH v2 3/6] KVM: arm64: maintain per VM value for CTR_EL0 Sebastian Ott
2024-04-26 10:49   ` Sebastian Ott
2024-04-26 10:49 ` [PATCH v2 4/6] KVM: arm64: add emulation for CTR_EL0 register Sebastian Ott
2024-04-26 10:49   ` Sebastian Ott
2024-05-01  8:15   ` Oliver Upton
2024-05-01  8:15     ` Oliver Upton
2024-05-03 15:50     ` Marc Zyngier
2024-05-03 15:50       ` Marc Zyngier
2024-05-03 17:27       ` Oliver Upton
2024-05-03 17:27         ` Oliver Upton
2024-05-08 15:17     ` Sebastian Ott
2024-05-08 15:17       ` Sebastian Ott
2024-05-08 17:18       ` Oliver Upton
2024-05-08 17:18         ` Oliver Upton
2024-04-26 10:49 ` [PATCH v2 5/6] KVM: arm64: show writable masks for feature registers Sebastian Ott
2024-04-26 10:49   ` Sebastian Ott
2024-05-01  7:31   ` Oliver Upton
2024-05-01  7:31     ` Oliver Upton
2024-05-03 11:03     ` Sebastian Ott
2024-05-03 11:03       ` Sebastian Ott
2024-04-26 10:49 ` [PATCH v2 6/6] KVM: arm64: rename functions for invariant sys regs Sebastian Ott
2024-04-26 10:49   ` Sebastian Ott
2024-05-01  8:17 ` Oliver Upton [this message]
2024-05-01  8:17   ` [PATCH v2 0/6] KVM: arm64: emulation for CTR_EL0 Oliver Upton
2024-05-03 11:01   ` Sebastian Ott
2024-05-03 11:01     ` Sebastian Ott

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