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

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Message-ID: <426367E2313C2449837CD2DE46E7EAF9223B57EC@SN2PRD0310MB382.namprd03.prod.outlook.com>
Date:	Fri, 13 Jul 2012 13:13:42 +0000
From:	KY Srinivasan <kys@...rosoft.com>
To:	Paolo Bonzini <pbonzini@...hat.com>
CC:	Greg KH <gregkh@...e.de>,
	"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)



> -----Original Message-----
> From: Paolo Bonzini [mailto:paolo.bonzini@...il.com] On Behalf Of Paolo
> Bonzini
> Sent: Friday, July 13, 2012 6:23 AM
> To: KY Srinivasan
> Cc: Greg KH; devel@...uxdriverproject.org; linux-kernel@...r.kernel.org;
> virtualization@...ts.osdl.org
> Subject: 0xB16B00B5? Really? (was Re: Move hyperv out of the drivers/staging/
> directory)
> 
> Il 04/10/2011 21:34, Greg KH ha scritto:
> > diff --git a/drivers/staging/hv/hyperv_vmbus.h b/drivers/hv/hyperv_vmbus.h
> > similarity index 99%
> > rename from drivers/staging/hv/hyperv_vmbus.h
> > rename to drivers/hv/hyperv_vmbus.h
> > index 3d2d836..8261cb6 100644
> > --- a/drivers/staging/hv/hyperv_vmbus.h
> > +++ b/drivers/hv/hyperv_vmbus.h
> > @@ -28,8 +28,7 @@
> >  #include <linux/list.h>
> >  #include <asm/sync_bitops.h>
> >  #include <linux/atomic.h>
> > -
> > -#include "hyperv.h"
> > +#include <linux/hyperv.h>
> >
> >  /*
> >   * The below CPUID leaves are present if
> VersionAndFeatures.HypervisorPresent
> 
> git's rename detection snips away this gem:
> 
> +#define HV_LINUX_GUEST_ID_LO		0x00000000
> +#define HV_LINUX_GUEST_ID_HI		0xB16B00B5
> +#define HV_LINUX_GUEST_ID		(((u64)HV_LINUX_GUEST_ID_HI
> << 32) | \
> +					   HV_LINUX_GUEST_ID_LO)
> 
> Somone was trying to be funny, I guess.
> 
> KY, I suppose you have access to Hyper-V code or can ask someone who does.
> Is this signature actually used in the Hyper-V host code?

It is still early in the morning here and pardon me if I am not seeing the issue.
Could you elaborate on what you want changed and why. This is a guest
signature that is stashed away in the hypervisor and perhaps can be retrieved
by the host. Other than that, this is not used anywhere else. MSFT has defined a
a namespace for guest IDs and while some ranges are reserved for MSFT operating
systems, there really is nothing special about the guest ID.

Regards,

K. Y



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