linux-kernel - Re: [PATCH 0/3] irqchip/gic-v4: Fix VMAPP/VMOVP races

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Message-ID: <86o76w2x2e.wl-maz@kernel.org>
Date: Wed, 17 Jul 2024 10:21:29 +0100
From: Marc Zyngier <maz@...nel.org>
To: Tangnianyao <tangnianyao@...wei.com>
Cc: <kvmarm@...ts.linux.dev>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	"guoyang (C)" <guoyang2@...wei.com>,
	jiangkunkun <jiangkunkun@...wei.com>,
	wangwudi <wangwudi@...ilicon.com>
Subject: Re: [PATCH 0/3] irqchip/gic-v4: Fix VMAPP/VMOVP races

On Wed, 17 Jul 2024 09:41:30 +0100,
Tangnianyao <tangnianyao@...wei.com> wrote:
> 
> Hi, Marc
> 
> I meet another problem while fixing this in kernel 5.10.
> 
> Kernel 5.10 does not support guard and we replace it with raw_spin_lock/unlock.
> When guest insmod nic drivers, it trigger host cpu power off somehow. The same
> testcase runs quite good in kernel 6.6(both host and guest).

This suggests that you got the locking order wrong, that one or
several CPUs deadlock, and that a watchdog fires.

> Would you fix this on long-term kernel 5.10? Or any sugguestion?

Sorry, but I have no intention to maintain such an ancient kernel,
which is why I did not Cc stable on these patches. I have no bandwidth
for this, nor any interest in it.

	M.

-- 
Without deviation from the norm, progress is not possible.