linux-kernel - Re: [PATCH 1/1] Drivers: hv: Cleanup the guest ID computation

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Message-ID: <20120725081647.GB22443@aepfle.de>
Date:	Wed, 25 Jul 2012 10:16:47 +0200
From:	Olaf Hering <olaf@...fle.de>
To:	"K. Y. Srinivasan" <kys@...rosoft.com>
Cc:	gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org,
	devel@...uxdriverproject.org, apw@...onical.com
Subject: Re: [PATCH 1/1] Drivers: hv: Cleanup the guest ID computation

On Tue, Jul 24, K. Y. Srinivasan wrote:


> +/*
> + * The guest OS needs to register the guest ID with the hypervisor.
> + * The guest ID is a 64 bit entity and the structure of this ID is
> + * specified in the Hyper-V specification:
> + *
> + * http://msdn.microsoft.com/en-us/library/windows/
> + * hardware/ff542653%28v=vs.85%29.aspx
> + *
> + * While the current guideline does not specify how Linux guest ID(s)
> + * need to be generated, our plan is to publish the guidelines for
> + * Linux and other guest operating systems that currently are hosted
> + * on Hyper-V. The implementation here conforms to this yet
> + * unpublished guidelines.
> + *
> + *
> + * Bit(s)
> + * 63 - Indicates if the OS is Open Source or not; 1 is Open Source
> + * 62:56 - Os Type; Linux is 0x100
> + * 55:48 - Distro specific identification
> + * 47:16 - Linux kernel version number
> + * 15:0  - Distro specific identification
> + *
> + *
> + */
> +
> +#define HV_LINUX_VENDOR_ID		0x8100

I suggest to drop bit 63, why would the hypervisor care about that
weird detail?

Olaf
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