From mboxrd@z Thu Jan  1 00:00:00 1970
From: Don Slutz <don.slutz@gmail.com>
Subject: Re: [PATCH v11 6/9] xen: Add ring 3 vmware_port support
Date: Fri, 26 Jun 2015 10:54:46 -0400
Message-ID: <558D67B6.8090303@Gmail.com>
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To: Jan Beulich <JBeulich@suse.com>, Don Slutz <dslutz@verizon.com>
Cc: Kevin Tian <kevin.tian@intel.com>, Keir Fraser <keir@xen.org>, Ian Campbell <ian.campbell@citrix.com>, Stefano Stabellini <stefano.stabellini@eu.citrix.com>, George Dunlap <George.Dunlap@eu.citrix.com>, Andrew Cooper <andrew.cooper3@citrix.com>, Tim Deegan <tim@xen.org>, xen-devel@lists.xen.org, Eddie Dong <eddie.dong@intel.com>, Aravind Gopalakrishnan <Aravind.Gopalakrishnan@amd.com>, Jun Nakajima <jun.nakajima@intel.com>, Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>, Boris Ostrovsky <boris.ostrovsky@oracle.com>, Ian Jackson <ian.jackson@eu.citrix.com>
List-Id: xen-devel@lists.xenproject.org

On 06/23/15 12:14, Jan Beulich wrote:
>>>> On 22.05.15 at 17:50, <dslutz@verizon.com> wrote:
>> Summary is that VMware treats "in (%dx),%eax" (or "out %eax,(%dx)")
>> to port 0x5658 specially.  Note: since many operations return data
>> in EAX, "in (%dx),%eax" is the one to use.  The other lengths like
>> "in (%dx),%al" will still do things, only AL part of EAX will be
>> changed.  For "out %eax,(%dx)" of all lengths, EAX will remain
>> unchanged.
>>
>> This instruction is allowed to be used from ring 3.  To
>> support this the vmexit for GP needs to be enabled.  I have not
>> fully tested that nested HVM is doing the right thing for this.
>>
>> Enable no-fault of pio in x86_emulate for VMware port
>>
>> Also adjust the emulation registers after doing a VMware
>> backdoor operation.
>>
>> Add new routine hvm_emulate_one_gp() to be used by the #GP fault
>> handler.
>>
>> Some of the best info is at:
>>
>> https://sites.google.com/site/chitchatvmback/backdoor
>>
>> Signed-off-by: Don Slutz <dslutz@verizon.com>
> As there don't seem to be enough convincing arguments for this to
> be worthwhile, I'm going to drop this and subsequent patches from
> my list of things to look at. Would you mind following George's (at
> least I think it was him) advice to post a shortened series with all
> review comments taken care of, so that at least the ring 0 pieces
> could go in for 4.6?

Sure, I was just about to post v12 (last check was a rebase with failed):

commit 65bb47fb732265f704d4ec6616076ec74771a6eb
Author: Paul Durrant <paul.durrant@citrix.com>
Date:   Tue Jun 23 18:08:32 2015 +0200

Needs more then simple merge.  Will post when ready.

    -Don Slutz


> Thanks, Jan
>
>
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