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Violators will be prosecuted; (version=TLSv1/SSLv3 cipher=AES256-GCM-SHA384 bits=256/256) Mon, 16 Dec 2019 11:29:26 -0000 Received: from d06av22.portsmouth.uk.ibm.com (d06av22.portsmouth.uk.ibm.com [9.149.105.58]) by b06cxnps4074.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id xBGBTPAd39583798 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Mon, 16 Dec 2019 11:29:25 GMT Received: from d06av22.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 39E394C04E; Mon, 16 Dec 2019 11:29:25 +0000 (GMT) Received: from d06av22.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id E8FF64C044; Mon, 16 Dec 2019 11:29:24 +0000 (GMT) Received: from oc7455500831.ibm.com (unknown [9.152.224.212]) by d06av22.portsmouth.uk.ibm.com (Postfix) with ESMTP; Mon, 16 Dec 2019 11:29:24 +0000 (GMT) Subject: Re: [RFC QEMU PATCH] pc-bios/s390-ccw: Add zipl-like "BOOT_IMAGE=x" to the kernel parameters To: Thomas Huth , qemu-devel@nongnu.org, Stefan Haberland References: <20191216112432.13412-1-thuth@redhat.com> From: Christian Borntraeger Autocrypt: addr=borntraeger@de.ibm.com; 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Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.2.0 MIME-Version: 1.0 In-Reply-To: <20191216112432.13412-1-thuth@redhat.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-TM-AS-GCONF: 00 x-cbid: 19121611-4275-0000-0000-0000038F80DB X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 19121611-4276-0000-0000-000038A3427B Message-Id: X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.95,18.0.572 definitions=2019-12-16_03:2019-12-16,2019-12-16 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=0 priorityscore=1501 lowpriorityscore=0 mlxlogscore=999 impostorscore=0 clxscore=1015 mlxscore=0 phishscore=0 spamscore=0 malwarescore=0 bulkscore=0 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-1910280000 definitions=main-1912160101 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x [generic] [fuzzy] X-Received-From: 148.163.156.1 X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-s390@vger.kernel.org, qemu-s390x@nongnu.org, Cornelia Huck , =?UTF-8?Q?Jan_H=c3=b6ppner?= , psundara@redhat.com Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On 16.12.19 12:24, Thomas Huth wrote: > Note: I've marked the patch as RFC since I'm not quite sure whether > this is really the right way to address this issue: It's unfortunate > that we have to mess with different location in ZIPL which might also > change again in the future. As suggested by Christian on IRC last week, > maybe it would make more sense to change ZIPL to add this parameter > already when zipl is installed (i.e. by the Linux userspace "zipl" pro- > gram), instead of adding it during boot time? Also, the BOOT_IMAGE para- > meter on s390x is quite different from the BOOT_IMAGE paramter that is > used on x86 - while s390x only uses one single number here, the x86 > variant (added by grub2, I guess) uses the boot device + full filename > of the kernel on the boot partition. Should we maybe make the s390x > variant more conform to x86? If so, I think this really has to be fixed > in zipl userspace tool, and not in the s390-ccw bios (and zipl stage3 > bootloader). Yes, I actually think we should revisit the whole BOOT_IMAGE scheme on s390. Maybe we should use the kernel name, or the name of the boot menu entry. And maybe we should not use 0 (when the default is running) but instead really use to what 0 points to.