From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([140.186.70.92]:41432) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1QMjpK-0004A4-9N for qemu-devel@nongnu.org; Wed, 18 May 2011 12:42:27 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1QMjpJ-0002NA-He for qemu-devel@nongnu.org; Wed, 18 May 2011 12:42:26 -0400 Received: from david.siemens.de ([192.35.17.14]:15940) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1QMjpJ-0002N6-8B for qemu-devel@nongnu.org; Wed, 18 May 2011 12:42:25 -0400 Message-ID: <4DD3F6EF.5000007@siemens.com> Date: Wed, 18 May 2011 18:42:23 +0200 From: Jan Kiszka MIME-Version: 1.0 References: <4DD3C5B9.1080908@redhat.com> <4DD3D236.90708@siemens.com> <4DD3E271.2010903@codemonkey.ws> <4DD3E53F.202@redhat.com> <4DD3F218.2040807@redhat.com> In-Reply-To: <4DD3F218.2040807@redhat.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Subject: Re: [Qemu-devel] [RFC] Memory API List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Avi Kivity Cc: qemu-devel On 2011-05-18 18:21, Avi Kivity wrote: > On 05/18/2011 06:26 PM, Avi Kivity wrote: >>> This is about registration. Right now you can only register IO >>> intercepts in the chipset, not on a per-CPU basis. We could just as >>> easily have: >>> >>> CPUState { >>> MemoryRegion apic_region; >>> }; >>> >>> per_cpu_register_memory(env, &env->apic_region); >>> >> >> >> Right. Or all memory per-cpu, with two sub-regions: >> >> - global memory >> - overlaid apic memory >> >> for this, we need to have well defined semantics for overlap (perhaps >> a priority argument to memory_region_add_subregion). > > Or even > > cpu_memory_region > | > +-- global memory map (prio 0) > | | > | +-- RAM (prio 0) > | | > | +-- PCI (prio 1) It depends on the chipset and its configuration (via PAM e.g.) in what region which takes precedence. Fixed prios do not help here. > | > +-- SMM memory (if active, prio 1) > | > +-- APIC memory (if active, prio 2) Jan -- Siemens AG, Corporate Technology, CT T DE IT 1 Corporate Competence Center Embedded Linux