linux-kernel - Re: [PATCH] irqchip/gic-v3-its: Don't need VSYNC if VMAPP with {V, Alloc}=={0, x}

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Date: Wed, 3 Apr 2024 16:33:35 +0800
From: Tangnianyao <tangnianyao@...wei.com>
To: Marc Zyngier <maz@...nel.org>
CC: <tglx@...utronix.de>, <linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>, <guoyang2@...wei.com>,
	<wangwudi@...ilicon.com>
Subject: Re: [PATCH] irqchip/gic-v3-its: Don't need VSYNC if VMAPP with {V,
 Alloc}=={0, x}



On 4/3/2024 14:00, Marc Zyngier wrote:
> On Wed, 03 Apr 2024 03:18:51 +0100,
> Tangnianyao <tangnianyao@...wei.com> wrote:
>>
>>
>> On 4/2/2024 21:43, Marc Zyngier wrote:
>>> On Tue, 02 Apr 2024 14:32:40 +0100,
>>> Tangnianyao <tangnianyao@...wei.com> wrote:
>>>>
>>>> Thank you for quick fix, it would be great to remove this VSYNC. ITS handling VSYNC unmap
>>>> vpeid may waste some time, trigger exception and needed to be
>>>> handled.
>>> Do you actually see an exception being delivered from this?
>>>
>>> In any case, feel free to respin the patch after having tested this
>>> diff, with the commit message fixed and a Fixes: tag attached to it.
>> In our developing implemenation, ITS would report RAS when doing vsync
>> and reaching an invalid vpe table entry. It is reasonable to report RAS, right?
> If a RAS error is the only reporting method you have, then I suspect
> you don't have much of a choice (the pseudocode indicates an IMPDEF
> SError for VSYNC). Shame this wasn't caught earlier.
>
>> It just reports, and kernel can still run normally regardless of
>> this RAS message.
> That really depends on the policy behind RAS errors.
>
> Looking forward to your respinning of this patch.

I have tested your patch and it's ok to fix the above problem.
Respin patch will be sent later.


>
> Thanks,
>
> 	M.
>