linux-kernel - Re: [PATCH] drivers: hv: use Linux version in guest ID

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Date:	Fri, 20 Jul 2012 08:26:50 -0700
From:	Greg KH <gregkh@...uxfoundation.org>
To:	Bjørn Mork <bjorn@...k.no>
Cc:	KY Srinivasan <kys@...rosoft.com>,
	Paolo Bonzini <pbonzini@...hat.com>,
	devel@...uxdriverproject.org, linux-kernel@...r.kernel.org,
	virtualization@...ts.osdl.org
Subject: Re: [PATCH] drivers: hv: use Linux version in guest ID

On Fri, Jul 20, 2012 at 10:03:08AM +0200, Bjørn Mork wrote:
> Use OS version number in the guest ID as recommended by Microsoft
> 
> Signed-off-by: Bjørn Mork <bjorn@...k.no>
> ---
> So how about something like this?  Yes, I know including
> linux/version.h often is unwanted, but the spec does
> recommend using the actual OS version in the guest ID
> 
> Yes, this will be offensive again when Linux is at 
> version 181.0, but we might have found a better solution by
> then :-)
> 
> 
>  drivers/hv/hyperv_vmbus.h |   20 ++++++++++++++++----
>  1 file changed, 16 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/hv/hyperv_vmbus.h b/drivers/hv/hyperv_vmbus.h
> index b9426a6..cc0c3f0 100644
> --- a/drivers/hv/hyperv_vmbus.h
> +++ b/drivers/hv/hyperv_vmbus.h
> @@ -29,6 +29,7 @@
>  #include <asm/sync_bitops.h>
>  #include <linux/atomic.h>
>  #include <linux/hyperv.h>
> +#include <linux/version.h>
>  
>  /*
>   * The below CPUID leaves are present if VersionAndFeatures.HypervisorPresent
> @@ -410,10 +411,21 @@ enum {
>  
>  #define HV_PRESENT_BIT			0x80000000
>  
> -#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)
> +/* Linux vendor ID allocated by Microsoft */
> +#define HV_LINUX_GUEST_ID_VENDOR	0xB16B
> +
> +/* Creating a guest ID conforming to the encoding recommended by
> + * Microsoft, with variant and build fixed to 0

We could use the kernel build number here as well, if we really wanted
it, right?

Otherwise, I like this patch, KY, any objection to me taking it?

thanks,

greg k-h
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