linux-kernel - Re: [RFC KERNEL PATCH v2 1/3] xen/pci: Add xen_reset_device

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Date:   Mon, 4 Dec 2023 08:49:56 +0000
From:   "Chen, Jiqian" <Jiqian.Chen@....com>
To:     Thomas Gleixner <tglx@...utronix.de>
CC:     Juergen Gross <jgross@...e.com>,
        Stefano Stabellini <sstabellini@...nel.org>,
        Oleksandr Tyshchenko <oleksandr_tyshchenko@...m.com>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        "Rafael J . Wysocki" <rafael@...nel.org>,
        Len Brown <lenb@...nel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Roger Pau Monné <roger.pau@...rix.com>,
        "xen-devel@...ts.xenproject.org" <xen-devel@...ts.xenproject.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
        "Stabellini, Stefano" <stefano.stabellini@....com>,
        "Deucher, Alexander" <Alexander.Deucher@....com>,
        "Koenig, Christian" <Christian.Koenig@....com>,
        "Hildebrand, Stewart" <Stewart.Hildebrand@....com>,
        "Ragiadakou, Xenia" <Xenia.Ragiadakou@....com>,
        "Huang, Honglei1" <Honglei1.Huang@....com>,
        "Zhang, Julia" <Julia.Zhang@....com>,
        "Huang, Ray" <Ray.Huang@....com>,
        "Chen, Jiqian" <Jiqian.Chen@....com>
Subject: Re: [RFC KERNEL PATCH v2 1/3] xen/pci: Add xen_reset_device_state
 function


On 2023/12/4 15:58, Thomas Gleixner wrote:
> On Fri, Nov 24 2023 at 18:31, Jiqian Chen wrote:
>> When device on dom0 side has been reset, the vpci on Xen side
>> won't get notification, so that the cached state in vpci is
>> all out of date with the real device state.
>> To solve that problem, this patch add a function to clear all
> 
> Please get rid of 'this patch' all over the series.
> 
> # grep -r 'This patch' Documentation/process/
Thanks. I will remove "this patch" or "I/we" in next version.

> 
>> vpci device state when device is reset on dom0 side.
>>
>> And call that function in pcistub_init_device. Because when
>> we use "pci-assignable-add" to assign a passthrough device in
>> Xen, it will reset passthrough device and the vpci state will
>> out of date, and then device will fail to restore bar state.
>>
>> Signed-off-by: Jiqian Chen <Jiqian.Chen@....com>
>> Signed-off-by: Huang Rui <ray.huang@....com>
> 
> This Signed-off-by chain is incorrect.
> 
> Documentation/process/submitting-patches.rst has a full chapter about
> S-O-B and the correct usage.
I am the author of this series of patches, and Huang Rui transported the v1 to upstream. And now I transport v2. I am not aware that the SOB chain is incorrect.
Do you have any suggestions?

> 
> Thanks,
> 
>         tglx

-- 
Best regards,
Jiqian Chen.