linux-kernel - Re: [PATCH] irqchipi/gic-v4: Ensure accessing the correct RD when and writing INVLPIR

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Date:   Wed, 21 Jun 2023 20:30:56 +0800
From:   Kunkun Jiang <jiangkunkun@...wei.com>
To:     Marc Zyngier <maz@...nel.org>
CC:     Thomas Gleixner <tglx@...utronix.de>,
        Zenghui Yu <yuzenghui@...wei.com>,
        "open list:IRQCHIP DRIVERS" <linux-kernel@...r.kernel.org>,
        <wanghaibin.wang@...wei.com>, <chenxiang66@...ilicon.com>,
        <tangnianyao@...wei.com>
Subject: Re: [PATCH] irqchipi/gic-v4: Ensure accessing the correct RD when and
 writing INVLPIR

Hi Mrac,

On 2023/6/17 15:35, Marc Zyngier wrote:
> On Tue, 16 May 2023 13:01:59 +0100,
> Kunkun Jiang <jiangkunkun@...wei.com> wrote:
>> Hi Marc,
>>
>> On 2023/5/16 18:15, Marc Zyngier wrote:
>>> On Thu, 13 Apr 2023 04:57:17 +0100,
>>> Kunkun Jiang <jiangkunkun@...wei.com> wrote:
>>>>> Wouldn't it be nice if irq_to_cpuid() could work out whether it is
>>>>> dealing with a LPI or a VLPI like it does today, but also directly
>>>>> with a VPE? We could then use the same code as derect_lpi_inv(). I
>>>>> came up with this the hack below, which is totally untested as I don't
>>>>> have access to GICv4.1 HW.
>>>>>
>>>>> Could you give it a spin?
>>>> Nice, I will test it as soon as possible.
>>> Did you ever managed to test this?
>> Sorry,I've only been coordinating the GICv4.1 environment in the last
>> few days. I have tested it with GICv4 many times, and it doesn't recur.
>> However, another call trace occurs with GICv4.1 when the device driver
>> is loaded in Guest. I haven't found out why. Maybe you can help analyze it.
> I also went back to my patch, and it is a bit bogus (it doesn't even
> compile to start with). I've now posted new version[1] that should at
> least fix the bug you initially reported.
>
> Can you please test it and reply to it?
I haven't coordinated the environment well these days. I'll test it out
after Dragon Boat Festival.

Thanks,
Kunkun Jiang
> Thanks,
>
> 	M.
>
> [1] https://lore.kernel.org/r/20230617073242.3199746-1-maz@kernel.org
>