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Violators will be prosecuted; (version=TLSv1/SSLv3 cipher=AES256-GCM-SHA384 bits=256/256) Mon, 25 Jun 2018 08:10:47 +0100 Received: from d06av23.portsmouth.uk.ibm.com (d06av23.portsmouth.uk.ibm.com [9.149.105.59]) by b06cxnps4076.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id w5P7AkTF31719560 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=FAIL); Mon, 25 Jun 2018 07:10:46 GMT Received: from d06av23.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 14233A4053; Mon, 25 Jun 2018 08:10:41 +0100 (BST) Received: from d06av23.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id D2340A405D; Mon, 25 Jun 2018 08:10:40 +0100 (BST) Received: from oc7330422307.ibm.com (unknown [9.152.224.43]) by d06av23.portsmouth.uk.ibm.com (Postfix) with ESMTP; Mon, 25 Jun 2018 08:10:40 +0100 (BST) Subject: Re: s390 qemu boot failure in -next To: Guenter Roeck , Martin Schwidefsky Cc: Vasily Gorbik , Heiko Carstens , linux-s390@vger.kernel.org, linux-kernel@vger.kernel.org References: <20180622194736.GA5794@roeck-us.net> From: Christian Borntraeger Openpgp: preference=signencrypt Autocrypt: addr=borntraeger@de.ibm.com; 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Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.7.0 MIME-Version: 1.0 In-Reply-To: <20180622194736.GA5794@roeck-us.net> Content-Language: en-US X-TM-AS-GCONF: 00 x-cbid: 18062507-0020-0000-0000-0000029E8AF5 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 18062507-0021-0000-0000-000020EAFA8B Message-Id: <126ac556-0602-b927-58f5-cb5f65a5e0ec@de.ibm.com> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:,, definitions=2018-06-25_04:,, signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=762 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1806210000 definitions=main-1806250085 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 06/22/2018 09:47 PM, Guenter Roeck wrote: > Hi, > > starting with commit 's390/boot: make head.S and als.c be part of the > decompressor only' in -next, s390 immages no longer boot in qemu. > As far as I can see, the reason is that the command line is no longer > passed from qemu to the kernel, which results in a panic because the > root file system can not be mounted. > > Was this change made on purpose ? If so, is there a way to get qemu > back to working ? Certainly not on purpose. Vasily, I can reproduce this with KVM and an external kernel boot of the vmlinux file (the elf file) e.g. qemu-system-s390 -enable-kvm -nographic -kernel vmlinux -append "this string no longer is command line" The compressed image (bzImage) seems to work fine though. This seems to be an unfortunate side effect of QEMUs ways to "guess" its Linux (checking for start address 0x10000, which is no longer true for the vmlinux file). With the pure vmlinux elf file the load address is 0x100000 as there is no unpacker. Guenter, can you check if arch/s390/boot/bzImage works for you as a workaround?