linux-kernel - Re: 0xB16B00B5? Really? (was Re: Move hyperv out of the drivers/staging/ directory)

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Message-ID: <20120719232832.GA6317@kroah.com>
Date:	Thu, 19 Jul 2012 16:28:32 -0700
From:	"Greg KH (gregkh@...uxfoundation.org)" <gregkh@...uxfoundation.org>
To:	KY Srinivasan <kys@...rosoft.com>
Cc:	Paolo Bonzini <pbonzini@...hat.com>,
	"devel@...uxdriverproject.org" <devel@...uxdriverproject.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"virtualization@...ts.osdl.org" <virtualization@...ts.osdl.org>
Subject: Re: 0xB16B00B5? Really? (was Re: Move hyperv out of the
 drivers/staging/ directory)

On Thu, Jul 19, 2012 at 10:30:38PM +0000, KY Srinivasan wrote:
> > > As you know, this ID has been in use for a long time now. While the hypervisor
> > > does not interpret the guest ID that is registered, I am not sure what
> > dependencies
> > > there might be on this value.
> > 
> > Could you please go find out the answer to this?
> 
> That is easier said than done. I have sent emails out asking this very question and I have
> not received a definitive answer yet. Not knowing if and when I can get a definitive
> answer here, I chose the least risky approach in my patch. 

What happens if you test with different values?

> > If, as you originally stated, there is a range of values we can use,
> > then we should probably use another one, right?
> 
> On the Windows side this ID namespace is managed well.

It is?  How is this managed?  What does this tell the hypervisor?  What
changes with the different values?

> However on the Linux side, we have really had this current ID in use
> for almost five years now. I am not aware of any pool of IDs available
> for Linux usage except that Linux IDs be distinct from the guest IDs
> in use by MSFT operating systems. If I were to change the guest ID, I
> would probably want to comply with the MSFT guidance on constructing
> these IDs (although not all fields may be relevant for Linux).

What are those rules?

thanks,

greg k-h
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