From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([208.118.235.92]:34924) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1SRjbQ-00040t-FZ for qemu-devel@nongnu.org; Tue, 08 May 2012 08:33:22 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1SRjbL-0000DI-Tg for qemu-devel@nongnu.org; Tue, 08 May 2012 08:33:16 -0400 Received: from e06smtp10.uk.ibm.com ([195.75.94.106]:51673) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1SRjbL-0000CV-LI for qemu-devel@nongnu.org; Tue, 08 May 2012 08:33:11 -0400 Received: from /spool/local by e06smtp10.uk.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Tue, 8 May 2012 13:33:06 +0100 Received: from d06av08.portsmouth.uk.ibm.com (d06av08.portsmouth.uk.ibm.com [9.149.37.249]) by d06nrmr1707.portsmouth.uk.ibm.com (8.13.8/8.13.8/NCO v10.0) with ESMTP id q48CWf9I2666524 for ; Tue, 8 May 2012 13:32:41 +0100 Received: from d06av08.portsmouth.uk.ibm.com (loopback [127.0.0.1]) by d06av08.portsmouth.uk.ibm.com (8.14.4/8.13.1/NCO v10.0 AVout) with ESMTP id q48CWeSX025231 for ; Tue, 8 May 2012 06:32:40 -0600 Message-ID: <4FA91267.5050306@de.ibm.com> Date: Tue, 08 May 2012 14:32:39 +0200 From: Christian Borntraeger MIME-Version: 1.0 References: <1336139040-16628-1-git-send-email-borntraeger@de.ibm.com> <1336139040-16628-2-git-send-email-borntraeger@de.ibm.com> <16456C5E-6C77-4976-8F09-A122C0FE0943@suse.de> <4FA3E108.9040204@de.ibm.com> <4FA3E15D.20804@de.ibm.com> <72DBB625-871D-4B0F-8139-A8F941448905@suse.de> In-Reply-To: <72DBB625-871D-4B0F-8139-A8F941448905@suse.de> Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Subject: Re: [Qemu-devel] [PATCH 1/1] s390: IPL device for s390 List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Anthony Liguori Cc: Cornelia Huck , Jens Freimann , Heinz Graalfs , Alexander Graf , qemu-devel Developers On 04/05/12 20:12, Alexander Graf wrote: > > On 04.05.2012, at 16:02, Christian Borntraeger wrote: > >> On 04/05/12 16:00, Christian Borntraeger wrote: >>>>> An IPL (booting) on s390 of SCSI disks is done by a firmware component. >>>>> Lets implement this scheme as an qemu device that also allows to >>>>> configure the IPL like the HMC. We have a parameter iplid that >>>>> refers to a disk device and a load parm that specifies the entry >>>>> on the disk to be ipled. We also provide a default device >>>>> if no -device s390-ipl statement is given. >>>> >>>> Any reason we can't do this in guest firmware code? >>> >>> Conceptually guest firmware does not exist in the guest address space >>> on s390. It is separate in a storage area called HSA. >>> (you could say the existing hardware is semi-hosted, you cant buy it bare >>> metal. >>> Doing the boot code in guest address space will fail if the guest firmware >>> address collides with the addresses specified by a bootmap. >> >> Or in other words, this code is closer to the real s390 boxes. > > Yeah, I see the point. I'd really like to get Anthony's comments on this one first though. Right. Anthony, this is the prototype of the IPL device that we have talked about some weeks ago. Is an external device to do the IPL process for s390 still ok with you? Christian