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

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Date:   Sat, 17 Jun 2023 08:02:51 +0100
From:   Marc Zyngier <maz@...nel.org>
To:     Kunkun Jiang <jiangkunkun@...wei.com>
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

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.

Which driver is loaded in the guest?

As I said, I don't have the HW at all, so I cannot test things, and
this stack-trace is not enough to analyse anything (you're not even
saying what you are doing).

	M.

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