From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:49818) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1fLCGI-0000TB-Q8 for qemu-devel@nongnu.org; Tue, 22 May 2018 14:43:55 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1fLCGD-0006Uh-V3 for qemu-devel@nongnu.org; Tue, 22 May 2018 14:43:54 -0400 Received: from mail-wm0-x242.google.com ([2a00:1450:400c:c09::242]:33106) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1fLCGD-0006UL-OB for qemu-devel@nongnu.org; Tue, 22 May 2018 14:43:49 -0400 Received: by mail-wm0-x242.google.com with SMTP id x12-v6so17896419wmc.0 for ; Tue, 22 May 2018 11:43:49 -0700 (PDT) References: <1526801333-30613-1-git-send-email-whois.zihan.yang@gmail.com> <1526801333-30613-4-git-send-email-whois.zihan.yang@gmail.com> From: Marcel Apfelbaum Message-ID: <25bc34e0-3ecf-1465-cff7-6ba1a162dec1@gmail.com> Date: Tue, 22 May 2018 21:43:45 +0300 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Content-Language: en-US Subject: Re: [Qemu-devel] [RFC 3/3] acpi-build: allocate mcfg for multiple host bridges List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Zihan Yang , qemu-devel@nongnu.org Cc: "Michael S. Tsirkin" , Igor Mammedov , Paolo Bonzini , Richard Henderson , Eduardo Habkost , lersek@redhat.com On 05/22/2018 09:03 AM, Zihan Yang wrote: > > An interesting point is if we want to limit the MMFCG size for PXBs, > as we may not be > > interested to use all the buses in a specific domain. > > OK, perhaps providing an option for the user to specify the desired > bus numbers? > Right, specifying the number of buses that can be used (e.g: max_busses) will decrease a lot the amount of address space we have to reserve. > > For each bus we require some address space that remains unused. > > Does this mean we should reserve some slots in a bus, or reduce > the number of buses used in each domain? > Limit the number of buses per PCI domain (excluding PCI domain 0, of course) > > [Adding Laszlo for his insights] > > Looking forward to see the SeaBIOS patches :) > > I appreciate your reviews, I'll write the rest part as soon as possible. > Thanks, Marcel > Thanks >