From: Marc Zyngier <maz@kernel•org>
To: Oliver Upton <oliver.upton@linux•dev>
Cc: kvmarm@lists•linux.dev, James Morse <james.morse@arm•com>,
Suzuki K Poulose <suzuki.poulose@arm•com>,
Zenghui Yu <yuzenghui@huawei•com>, Will Deacon <will@kernel•org>,
Catalin Marinas <catalin.marinas@arm•com>,
linux-arm-kernel@lists•infradead.org,
Darren Hart <darren@os•amperecomputing.com>,
D Scott Phillips <scott@os•amperecomputing.com>
Subject: Re: [PATCH 0/3] KVM: arm64: Work around Ampere1 erratum AC03_CPU_38
Date: Thu, 15 Jun 2023 10:51:42 +0100 [thread overview]
Message-ID: <87a5x1qci9.wl-maz@kernel.org> (raw)
In-Reply-To: <20230609220104.1836988-1-oliver.upton@linux.dev>
On Fri, 09 Jun 2023 23:01:01 +0100,
Oliver Upton <oliver.upton@linux•dev> wrote:
>
> Hi folks,
>
> Small series to work around a CPU erratum on AmpereOne. While the
> implementation does not advertise support for FEAT_HAFDBS (due to
> another erratum), the associated control bits do not have RES0 behavior
> as required by the architecture.
>
> Usage of HAFDBS at stage-1 is unaffected, since HA and HD are only
> enabled on implementations that advertise the feature. However, KVM
> relies on HA having RES0 semantics if the feature isn't implemented. The
> end result is that KVM enables a broken hardware access flag
> implementation that could lead to correctness issues.
>
> Applies to 6.4-rc1. Tested with access_tracking_perf_test, verifying
> that KVM is indeed taking Access Flag faults.
For the series:
Reviewed-by: Marc Zyngier <maz@kernel•org>
M.
--
Without deviation from the norm, progress is not possible.
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next prev parent reply other threads:[~2023-06-15 9:52 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-06-09 22:01 [PATCH 0/3] KVM: arm64: Work around Ampere1 erratum AC03_CPU_38 Oliver Upton
2023-06-09 22:01 ` [PATCH 1/3] arm64: errata: Mitigate Ampere1 erratum AC03_CPU_38 at stage-2 Oliver Upton
2023-06-14 16:58 ` Catalin Marinas
2023-06-14 17:15 ` D Scott Phillips
2023-06-09 22:01 ` [PATCH 2/3] KVM: arm64: Refactor HFGxTR configuration into separate helpers Oliver Upton
2023-06-09 22:01 ` [PATCH 3/3] KVM: arm64: Prevent guests from enabling HA/HD on Ampere1 Oliver Upton
2023-06-14 16:57 ` [PATCH 0/3] KVM: arm64: Work around Ampere1 erratum AC03_CPU_38 Catalin Marinas
2023-06-14 23:06 ` Oliver Upton
2023-06-15 8:36 ` Catalin Marinas
2023-06-15 9:51 ` Marc Zyngier [this message]
2023-06-20 13:15 ` Oliver Upton
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