From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([140.186.70.92]:34249) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1QN3in-0002nl-FT for qemu-devel@nongnu.org; Thu, 19 May 2011 09:57:02 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1QN3im-0002VA-IJ for qemu-devel@nongnu.org; Thu, 19 May 2011 09:57:01 -0400 Received: from mx1.redhat.com ([209.132.183.28]:28823) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1QN3im-0002Uz-BP for qemu-devel@nongnu.org; Thu, 19 May 2011 09:57:00 -0400 Message-ID: <4DD521A6.4060404@redhat.com> Date: Thu, 19 May 2011 16:56:54 +0300 From: Avi Kivity MIME-Version: 1.0 References: <4DD3C5B9.1080908@redhat.com> <4DD3D236.90708@siemens.com> <4DD3D95E.2060105@redhat.com> <4DD3E1B3.3020405@siemens.com> <4DD3E610.1080201@siemens.com> <4DD4199E.2000702@codemonkey.ws> <4DD41DBB.2020108@web.de> <20110519082644.GC28399@redhat.com> <4DD4D53F.1090108@web.de> <4DD52082.1080804@codemonkey.ws> In-Reply-To: <4DD52082.1080804@codemonkey.ws> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Subject: Re: [Qemu-devel] [RFC] Memory API List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Anthony Liguori Cc: Peter Maydell , Jan Kiszka , qemu-devel , Gleb Natapov On 05/19/2011 04:52 PM, Anthony Liguori wrote: >> So we have a second use case for CPU-local I/O regions? >> >> I wonder if only a single CPU can enter SMM or if all have to. > > > For the i440fx, it's a chipset register (not a per-CPU register). > > Maybe it's per-CPU on more modern chipsets... I'm not really sure. IIRC the chipset register is only used during setup, so you can have access to this memory without entering SMM mode. Once you are in SMM mode, you don't need to touch anything. -- error compiling committee.c: too many arguments to function