All of lore.kernel.org
 help / color / mirror / Atom feed
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.

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

WARNING: multiple messages have this Message-ID (diff)
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.

  reply	other threads:[~2021-03-17 14:06 UTC|newest]

Thread overview: 18+ 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   ` 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
2021-03-02 10:27     ` Lorenzo Pieralisi
2021-03-08 19:22     ` Marc Zyngier
2021-03-08 19:22       ` Marc Zyngier
2021-03-15 11:02       ` Lorenzo Pieralisi
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     ` 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 10:07       ` Lorenzo Pieralisi
2021-03-17 14:04       ` Marc Zyngier [this message]
2021-03-17 14:04         ` Marc Zyngier
2021-03-17 14:40         ` Lorenzo Pieralisi
2021-03-17 14:40           ` Lorenzo Pieralisi
2021-04-22 13:07       ` [irqchip: irq/irqchip-next] " irqchip-bot for Lorenzo Pieralisi
2021-04-22 15:07       ` irqchip-bot for Lorenzo Pieralisi

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=87blbhj2q3.wl-maz@kernel.org \
    --to=maz@kernel.org \
    --cc=kvm@vger.kernel.org \
    --cc=linux-arm-kernel@lists.infradead.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=lorenzo.pieralisi@arm.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body. 
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.