From: Marc Zyngier <marc.zyngier@arm.com>
To: Will Deacon <will.deacon@arm.com>, kvmarm@lists.cs.columbia.edu
Cc: linux-arm-kernel@lists.infradead.org, kvm@vger.kernel.org,
xen-devel@lists.xenproject.org, linux@arm.linux.org.uk,
christoffer.dall@linaro.org, stable@vger.kernel.org
Subject: Re: [PATCH] KVM: arm64: add workaround for Cortex-A57 erratum #852523
Date: Mon, 14 Sep 2015 16:46:28 +0100 [thread overview]
Message-ID: <55F6EBD4.30809@arm.com> (raw)
In-Reply-To: <1442243163-2675-1-git-send-email-will.deacon@arm.com>
On 14/09/15 16:06, Will Deacon wrote:
> When restoring the system register state for an AArch32 guest at EL2,
> writes to DACR32_EL2 may not be correctly synchronised by Cortex-A57,
> which can lead to the guest effectively running with junk in the DACR
> and running into unexpected domain faults.
>
> This patch works around the issue by re-ordering our restoration of the
> AArch32 register aliases so that they happen before the AArch64 system
> registers. Ensuring that the registers are restored in this order
> guarantees that they will be correctly synchronised by the core.
>
> Cc: <stable@vger.kernel.org>
> Cc: Marc Zyngier <marc.zyngier@arm.com>
> Signed-off-by: Will Deacon <will.deacon@arm.com>
Reviewed-by: Marc Zyngier <marc.zyngier@arm.com>
I'll queue that together with the next batch of fixes.
Thanks,
M.
--
Jazz is not dead. It just smells funny...
next prev parent reply other threads:[~2015-09-14 15:46 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-09-14 15:06 [PATCH] KVM: arm64: add workaround for Cortex-A57 erratum #852523 Will Deacon
2015-09-14 15:46 ` Marc Zyngier [this message]
2015-09-14 17:01 ` Will Deacon
2015-09-15 19:00 ` Christoffer Dall
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