linux-kernel - Re: [PATCH v4 17/17] virt: acrn: Introduce an interface for Service VM to control vCPU

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Message-ID: <20200928063319.GG1057@shuo-intel.sh.intel.com>
Date:   Mon, 28 Sep 2020 14:33:19 +0800
From:   Shuo A Liu <shuo.a.liu@...el.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     linux-kernel@...r.kernel.org, x86@...nel.org,
        "H . Peter Anvin" <hpa@...or.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Sean Christopherson <sean.j.christopherson@...el.com>,
        Yu Wang <yu1.wang@...el.com>,
        Reinette Chatre <reinette.chatre@...el.com>,
        Zhi Wang <zhi.a.wang@...el.com>,
        Zhenyu Wang <zhenyuw@...ux.intel.com>
Subject: Re: [PATCH v4 17/17] virt: acrn: Introduce an interface for Service
 VM to control vCPU

On Mon 28.Sep'20 at  7:23:05 +0200, Greg Kroah-Hartman wrote:
>On Mon, Sep 28, 2020 at 12:10:07PM +0800, Shuo A Liu wrote:
>> > You just raced with userspace and lost.  If you want to add attribute
>> > files to a device, use the default attribute group list, and it will be
>> > managed properly for you by the driver core.
>> >
>> > Huge hint, if a driver every has to touch a kobject, or call sysfs_*,
>> > then it is probably doing something wrong.
>>
>> Do you mean use .groups of struct miscdevice directly ?
>>
>> If yes, let me follow drivers/char/hw_random/s390-trng.c to do this.
>> BTW, few driver use the .groups directly. :)
>
>Drivers should almost never be messing with individual sysfs files.  And
>this ability to use .groups is a "new" one, conversions of existing code
>that do not use them is always welcome.

OK. Thanks for the explanation. I will follow the 'new' way :)

Thanks
shuo