From: Marc Zyngier <maz@kernel.org>
To: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Cc: linux-kernel@vger.kernel.org,
LAKML <linux-arm-kernel@lists.infradead.org>,
KVM <kvm@vger.kernel.org>
Subject: Re: [PATCH v3 1/1] irqchip/gic-v4.1: Disable vSGI upon (GIC CPUIF < v4.1) detection
Date: Wed, 17 Mar 2021 14:04:36 +0000 [thread overview]
Message-ID: <87blbhj2q3.wl-maz@kernel.org> (raw)
In-Reply-To: <20210317100719.3331-2-lorenzo.pieralisi@arm.com>
Hi Lorenzo,
Wed, 17 Mar 2021 10:07:19 +0000,
Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> wrote:
>
> GIC CPU interfaces versions predating GIC v4.1 were not built to
> accommodate vINTID within the vSGI range; as reported in the GIC
> specifications (8.2 "Changes to the CPU interface"), it is
> CONSTRAINED UNPREDICTABLE to deliver a vSGI to a PE with
> ID_AA64PFR0_EL1.GIC < b0011.
>
> Check the GIC CPUIF version by reading the SYS_ID_AA64_PFR0_EL1.
>
> Disable vSGIs if a CPUIF version < 4.1 is detected to prevent using
> vSGIs on systems where they may misbehave.
>
> Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
> Cc: Marc Zyngier <maz@kernel.org>
Does it need to go in as a fix? or can it just be pushed into 5.13?
Given that there is no such HW in the wild just yet, I'm inclined to
do the latter...
Thanks,
M.
--
Without deviation from the norm, progress is not possible.
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next prev parent reply other threads:[~2021-03-17 14:06 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <0201111162841.3151-1-lorenzo.pieralisi@arm.com>
2021-03-02 10:27 ` [PATCH v2 0/1] GIC v4.1: Disable VSGI support for GIC CPUIF < v4.1 Lorenzo Pieralisi
2021-03-02 10:27 ` [PATCH v2 1/1] irqchip/gic-v4.1: Disable vSGI upon (GIC CPUIF < v4.1) detection Lorenzo Pieralisi
2021-03-08 19:22 ` Marc Zyngier
2021-03-15 11:02 ` Lorenzo Pieralisi
2021-03-17 10:07 ` [PATCH v3 0/1] GIC v4.1: Disable VSGI support for GIC CPUIF < v4.1 Lorenzo Pieralisi
2021-03-17 10:07 ` [PATCH v3 1/1] irqchip/gic-v4.1: Disable vSGI upon (GIC CPUIF < v4.1) detection Lorenzo Pieralisi
2021-03-17 14:04 ` Marc Zyngier [this message]
2021-03-17 14:40 ` Lorenzo Pieralisi
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