linux-kernel - Re: [PATCH v6 06/18] virt: acrn: Introduce VM management interfaces

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Message-ID: <20201215095259.GN17702@shuo-intel.sh.intel.com>
Date:   Tue, 15 Dec 2020 17:52:59 +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 v6 06/18] virt: acrn: Introduce VM management interfaces

On Wed  2.Dec'20 at 10:14:29 +0800, Shuo A Liu wrote:
>On Tue  1.Dec'20 at 11:09:47 +0100, Greg Kroah-Hartman wrote:
>>On Tue, Dec 01, 2020 at 05:38:41PM +0800, shuo.a.liu@...el.com wrote:
>>>+		vm_param->reserved0 = 0;
>>>+		vm_param->reserved1 = 0;
>>
>>NO!
>>
>>This means that userspace can put whatever crud they want in those
>>fields, and you will happily zero it out.  Then, when those reserved
>>fields are wanted to be used in the future, you will take those values
>>from userspace and accept them as a valid value.  But, since userspace
>>was sending crud before, now you will take that crud and do something
>>with it.
>>
>>TEST IT to verify that it is zero, that way userspace gets it right the
>>first time, and you don't get it wrong later, as you can not change it
>>later.
>
>OK. Thanks for the elaboration. I will test it and return -EINVAL if
>it is not zero.
>

Hi Greg,

Would you like to review other patches in this series on this version? 

This version got only this one comment, so doesn't have too much update.
I can send out a new version if you prefer to.

Thanks for review.

shuo