From mboxrd@z Thu Jan  1 00:00:00 1970
From: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Subject: Re: [PATCH v4 1/4] x86/HVM: update the start info
 structure layout
Date: Tue, 16 Feb 2016 16:26:18 -0500
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References: <1455644269-40358-1-git-send-email-roger.pau@citrix.com>
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To: Roger Pau Monne <roger.pau@citrix.com>, xen-devel@lists.xenproject.org
Cc: Wei Liu <wei.liu2@citrix.com>, Ian Campbell <ian.campbell@citrix.com>, Andrew Cooper <andrew.cooper3@citrix.com>, Ian Jackson <ian.jackson@eu.citrix.com>, Jan Beulich <jbeulich@suse.com>, Samuel Thibault <samuel.thibault@ens-lyon.org>
List-Id: xen-devel@lists.xenproject.org

On 02/16/2016 12:37 PM, Roger Pau Monne wrote:
> diff --git a/xen/include/public/xen.h b/xen/include/public/xen.h
> index 7b629b1..6ba060f 100644
> --- a/xen/include/public/xen.h
> +++ b/xen/include/public/xen.h
> @@ -787,25 +787,46 @@ typedef struct start_info start_info_t;
>   /*
>    * Start of day structure passed to PVH guests in %ebx.
>    *
> - * NOTE: nothing will be loaded at physical address 0, so
> - * a 0 value in any of the address fields should be treated
> - * as not present.
> + * NOTE: nothing will be loaded at physical address 0, so a 0 value in any
> + * of the address fields should be treated as not present.
> + *
> + *  0 +----------------+
> + *    | magic          | Contains the magic value HVM_START_MAGIC_VALUE
> + *    |                | ("xEn3" with the 0x80 bit of the "E" set).
> + *  4 +----------------+
> + *    | version        | Version of this structure. Current version is 0. New
> + *    |                | versions are guaranteed to be backwards-compatible.

#define XEN_HVM_START_INFO_VERSION   0

is needed then?