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SubjectRE: 0xB16B00B5? Really? (was Re: Move hyperv out of the drivers/staging/ directory)
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> -----Original Message-----
> From: Paolo Bonzini [mailto:paolo.bonzini@gmail.com] On Behalf Of Paolo
> Bonzini
> Sent: Friday, July 13, 2012 6:23 AM
> To: KY Srinivasan
> Cc: Greg KH; devel@linuxdriverproject.org; linux-kernel@vger.kernel.org;
> virtualization@lists.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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