From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([140.186.70.92]:35076) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1R3v4U-0002nn-6t for qemu-devel@nongnu.org; Wed, 14 Sep 2011 15:24:35 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1R3v4S-0007Fa-VR for qemu-devel@nongnu.org; Wed, 14 Sep 2011 15:24:34 -0400 Received: from mx1.redhat.com ([209.132.183.28]:44559) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1R3v4S-0007FL-Lb for qemu-devel@nongnu.org; Wed, 14 Sep 2011 15:24:32 -0400 Message-ID: <4E70FF6A.8050401@redhat.com> Date: Wed, 14 Sep 2011 22:24:26 +0300 From: Avi Kivity MIME-Version: 1.0 References: <4E6DAA09.1050701@twiddle.net> <4E6DCA61.4070009@siemens.com> <4E6DCCC4.1050201@redhat.com> <4E6DCE8D.9040602@siemens.com> <4E70C402.3090907@twiddle.net> <4E70EB39.4010101@siemens.com> <4E70EDFF.4000008@siemens.com> In-Reply-To: <4E70EDFF.4000008@siemens.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Subject: Re: [Qemu-devel] [PATCH] memory: simple memory tree printer List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Jan Kiszka Cc: Blue Swirl , qemu-devel , Richard Henderson On 09/14/2011 09:10 PM, Jan Kiszka wrote: > OK, let's try again: Do we have to model hierarchy in PIO address space > at all? I don't think so. We do. A device listens to addresses 0x100-0x110. Another BAR (at 0x106) clips this to 0x100-0x106. The pci/pci bridge clips this to 0x105-0x106. The host pci bridge remaps this as 0x1000000105-0x1000000106 in the memory address space space. But someone configured a cpu-local region at this address, so the cpu can't reach it at all. -- I have a truly marvellous patch that fixes the bug which this signature is too narrow to contain.