From mboxrd@z Thu Jan 1 00:00:00 1970 From: Avi Kivity Subject: Re: [PATCH v3 0/2] Inter-VM shared memory PCI device Date: Fri, 26 Mar 2010 18:56:11 +0300 Message-ID: <4BACD91B.2070604@redhat.com> References: <1269497310-21858-1-git-send-email-cam@cs.ualberta.ca> <4BAB2736.7020202@redhat.com> <8286e4ee1003250950l45cc2883yd4788d20f99ef86c@mail.gmail.com> <4BAB9718.3030808@redhat.com> <8286e4ee1003251035o75fed405j45b60d496afa66b5@mail.gmail.com> <4BABA1F4.3000801@redhat.com> <8286e4ee1003251117o74486dck813a47cee54b2d6d@mail.gmail.com> <4BABD12B.3070909@redhat.com> <8286e4ee1003251605rd3b0694tb2e98bd34e9b0fea@mail.gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Cc: kvm@vger.kernel.org, qemu-devel@nongnu.org To: Cam Macdonell Return-path: Received: from mx1.redhat.com ([209.132.183.28]:48988 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752563Ab0CZP4S (ORCPT ); Fri, 26 Mar 2010 11:56:18 -0400 In-Reply-To: <8286e4ee1003251605rd3b0694tb2e98bd34e9b0fea@mail.gmail.com> Sender: kvm-owner@vger.kernel.org List-ID: On 03/26/2010 01:05 AM, Cam Macdonell wrote: > >> I meant a unicast doorbell: 16 bits for guest ID, 16 bits for vector number. >> > Ah, yes. Who knew "two bit registers" is an ambiguous term. Do you > strongly prefer the one doorbell design? > Just floating out ideas. An advantage is that it conserves register space; this is important if we use PIO. For mmio this isn't so important. -- Do not meddle in the internals of kernels, for they are subtle and quick to panic.