From mboxrd@z Thu Jan  1 00:00:00 1970
From: George Dunlap <george.dunlap@eu.citrix.com>
Subject: Re: [PATCH for-4.5 v6 00/16] Xen VMware tools support
Date: Mon, 22 Sep 2014 16:19:05 +0100
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To: Ian Campbell <Ian.Campbell@citrix.com>, Don Slutz <dslutz@verizon.com>
Cc: Tim Deegan <tim@xen.org>, Kevin Tian <kevin.tian@intel.com>, Keir Fraser <keir@xen.org>, Jun Nakajima <jun.nakajima@intel.com>, Stefano Stabellini <stefano.stabellini@eu.citrix.com>, Ian Jackson <ian.jackson@eu.citrix.com>, Eddie Dong <eddie.dong@intel.com>, xen-devel@lists.xen.org, Aravind Gopalakrishnan <Aravind.Gopalakrishnan@amd.com>, Jan Beulich <jbeulich@suse.com>, Andrew Cooper <andrew.cooper3@citrix.com>, Boris Ostrovsky <boris.ostrovsky@oracle.com>, Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
List-Id: xen-devel@lists.xenproject.org

On 09/22/2014 02:56 PM, Ian Campbell wrote:
> On Sat, 2014-09-20 at 14:07 -0400, Don Slutz wrote:
>
>> I picked this subset to start with because it only has changes in
>> Xen.
>>
>> Some of this code is already in QEMU
> As I suggest in my reply to one for the rpc port patches it's not clear
> that any of this needs to be in Xen rather than qemu in the first place.
>
> I came to think this even more once I saw the save/restore support...

I don't think qemu can get notified on either cpuid or #GP faults, can it?

A big chunk of the functionality here is to allow a userspace process to 
transparently make the "hypercalls" without the OS needing to explicitly 
give it access to the IO space, by trapping the resulting #GP faults and 
checking to see if they are IO instructions .  If that's functionality 
we think is important, then it will have to be done in Xen, I think.

  -George