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

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Message-ID: <X9iJWXaIUpUq2qia@kroah.com>
Date:   Tue, 15 Dec 2020 11:00:57 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Shuo A Liu <shuo.a.liu@...el.com>
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 Tue, Dec 15, 2020 at 05:52:59PM +0800, Shuo A Liu wrote:
> 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?

Nope, it's the middle of the merge window, I can't do anything with any
new patches until after 5.11-rc1 is out.  So I suggest you fix up the
current issues and send a new patch series once 5.11-rc1 is released.

thanks,

greg k-h