From mboxrd@z Thu Jan  1 00:00:00 1970
From: "Luis R. Rodriguez" <mcgrof@do-not-panic.com>
Subject: Re: [RFC v2] misc/xenmicrocode: Upload
 /lib/firmware/<some blob> to the hypervisor
Date: Thu, 11 Jun 2015 19:30:45 -0700
Message-ID: <CAB=NE6X5L8hPa3217vGY+Q=d_q1UyzrgR6J7+oberQyzu73Gew@mail.gmail.com>
References: <1422580462-26324-1-git-send-email-mcgrof@do-not-panic.com>
	<54CB93F4.2050409@citrix.com> <20150130195131.GL19988@wotan.suse.de>
	<54CBEB8D.8030509@citrix.com> <20150130215701.GN19988@wotan.suse.de>
Mime-Version: 1.0
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: 7bit
Return-path: <xen-devel-bounces@lists.xen.org>
Received: from mail6.bemta3.messagelabs.com ([195.245.230.39])
	by lists.xen.org with esmtp (Exim 4.72)
	(envelope-from <mcgrof@gmail.com>) id 1Z3EkO-0005AB-MB
	for xen-devel@lists.xenproject.org; Fri, 12 Jun 2015 02:31:08 +0000
Received: by iebps5 with SMTP id ps5so15951160ieb.3
	for <xen-devel@lists.xenproject.org>;
	Thu, 11 Jun 2015 19:31:06 -0700 (PDT)
In-Reply-To: <20150130215701.GN19988@wotan.suse.de>
List-Unsubscribe: <http://lists.xen.org/cgi-bin/mailman/options/xen-devel>,
	<mailto:xen-devel-request@lists.xen.org?subject=unsubscribe>
List-Post: <mailto:xen-devel@lists.xen.org>
List-Help: <mailto:xen-devel-request@lists.xen.org?subject=help>
List-Subscribe: <http://lists.xen.org/cgi-bin/mailman/listinfo/xen-devel>,
	<mailto:xen-devel-request@lists.xen.org?subject=subscribe>
Sender: xen-devel-bounces@lists.xen.org
Errors-To: xen-devel-bounces@lists.xen.org
To: Andrew Cooper <andrew.cooper3@citrix.com>
Cc: Juergen Gross <jgross@suse.com>, Michal Marek <mmarek@suse.cz>, Jason Douglas <jdouglas@suse.com>, "Luis R. Rodriguez" <mcgrof@do-not-panic.com>, Takashi Iwai <tiwai@suse.de>, Stefano Stabellini <stefano.stabellini@eu.citrix.com>, Henrique de Moraes Holschuh <hmh@debian.org>, David Vrabel <david.vrabel@citrix.com>, Jan Beulich <JBeulich@suse.com>, xen-devel@lists.xenproject.org, Boris Ostrovsky <boris.ostrovsky@oracle.com>, Borislav Petkov <bp@suse.de>, Olaf Hering <ohering@suse.de>
List-Id: xen-devel@lists.xenproject.org

On Fri, Jan 30, 2015 at 1:57 PM, Luis R. Rodriguez <mcgrof@suse.com> wrote:
> On Fri, Jan 30, 2015 at 08:37:33PM +0000, Andrew Cooper wrote:
>> The right thing to do is to fix the hypercall implementation, at which
>> point the utility below is fine and xc_microcode_update() can be a thing
>> wrapper around the hypercall.
>>
>> The actions Xen needs to take are:
>>
>> - Copy the buffer into Xen.
>> - Scan the buffer for the correct patch
>> - Rendezvous all online cpus in an IPI to apply the patch, and keep the
>> processors in until all have completed the patch.
>>
>> The IPI itself probably wants common rendezvous code, and a system
>> specific call for application.  The system specific call will need to
>> adhere to the requirements in the relevant manual.  Care will have to be
>> taken to avoid deadlocking with the time calibration rendezvous, and
>> facilities such as the watchdog might temporally need pausing.
>>
>> If you feel up to all that, then please go ahead.  If not, I will
>> attempt to find some copious free time.
>
> You can have a crack at that. Let me know when the above is ready and I'll
> respin. I'd try it but it seems you would spend considerbly less time than
> me doing the above.

Andrew, wanted to check to see if you have had time to work on the above.

 Luis