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Violators will be prosecuted; (version=TLSv1/SSLv3 cipher=AES256-GCM-SHA384 bits=256/256) Tue, 3 Dec 2019 13:33:27 -0000 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 xB3DXPTf36634638 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Tue, 3 Dec 2019 13:33:25 GMT Received: from d06av23.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 7B4A8A4051; Tue, 3 Dec 2019 13:33:25 +0000 (GMT) Received: from d06av23.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 4B562A404D; Tue, 3 Dec 2019 13:33:25 +0000 (GMT) Received: from oc7455500831.ibm.com (unknown [9.152.224.20]) by d06av23.portsmouth.uk.ibm.com (Postfix) with ESMTP; Tue, 3 Dec 2019 13:33:25 +0000 (GMT) Subject: Re: [PATCH v3 4/4] pc-bios/s390x: Fix reset psw mask To: Janosch Frank , qemu-devel@nongnu.org References: <20191203132813.2734-1-frankja@linux.ibm.com> <20191203132813.2734-5-frankja@linux.ibm.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: <20191203132813.2734-5-frankja@linux.ibm.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-TM-AS-GCONF: 00 x-cbid: 19120313-4275-0000-0000-0000038A7C1A X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 19120313-4276-0000-0000-0000389E19EC Message-Id: X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.95,18.0.572 definitions=2019-12-03_03:2019-12-02,2019-12-03 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 clxscore=1015 lowpriorityscore=0 bulkscore=0 phishscore=0 priorityscore=1501 impostorscore=0 suspectscore=0 spamscore=0 mlxscore=0 adultscore=0 mlxlogscore=999 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-1910280000 definitions=main-1912030105 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 3.x [generic] [fuzzy] X-Received-From: 148.163.158.5 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: qemu-s390x@nongnu.org, mihajlov@linux.ibm.com, cohuck@redhat.com Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On 03.12.19 14:28, Janosch Frank wrote: > We need to set the short psw indication bit in the reset psw, as it is > a short psw. > > fixes: 9629823290 ("pc-bios/s390-ccw: do a subsystem reset before running the guest") > Signed-off-by: Janosch Frank We should also add commit 24bb1fa36ff7b25ee774dbe4a18830dc782b54bf (HEAD, github-cohuck/s390-next) Author: Janosch Frank AuthorDate: Fri Nov 29 09:20:23 2019 -0500 Commit: Cornelia Huck CommitDate: Mon Dec 2 09:58:57 2019 +0100 s390x: Properly fetch and test the short psw on diag308 subc 0/1 or whatever the final commit id will be. While this patch is not "broken" it exposes the bug. > --- > pc-bios/s390-ccw/jump2ipl.c | 12 +++++++----- > 1 file changed, 7 insertions(+), 5 deletions(-) > > diff --git a/pc-bios/s390-ccw/jump2ipl.c b/pc-bios/s390-ccw/jump2ipl.c > index 266f1502b9..da13c43cc0 100644 > --- a/pc-bios/s390-ccw/jump2ipl.c > +++ b/pc-bios/s390-ccw/jump2ipl.c > @@ -12,11 +12,11 @@ > #define KERN_IMAGE_START 0x010000UL > #define PSW_MASK_64 0x0000000100000000ULL > #define PSW_MASK_32 0x0000000080000000ULL > -#define IPL_PSW_MASK (PSW_MASK_32 | PSW_MASK_64) > +#define PSW_MASK_SHORTPSW 0x0008000000000000ULL > +#define RESET_PSW_MASK (PSW_MASK_SHORTPSW | PSW_MASK_32 | PSW_MASK_64) > > typedef struct ResetInfo { > - uint32_t ipl_mask; > - uint32_t ipl_addr; > + uint64_t ipl_psw; > uint32_t ipl_continue; > } ResetInfo; > > @@ -50,7 +50,9 @@ void jump_to_IPL_code(uint64_t address) > ResetInfo *current = 0; > > save = *current; > - current->ipl_addr = (uint32_t) (uint64_t) &jump_to_IPL_2; > + > + current->ipl_psw = (uint64_t) &jump_to_IPL_2; > + current->ipl_psw |= RESET_PSW_MASK; > current->ipl_continue = address & 0x7fffffff; > > debug_print_int("set IPL addr to", current->ipl_continue); > @@ -82,7 +84,7 @@ void jump_to_low_kernel(void) > } > > /* Trying to get PSW at zero address */ > - if (*((uint64_t *)0) & IPL_PSW_MASK) { > + if (*((uint64_t *)0) & RESET_PSW_MASK) { > jump_to_IPL_code((*((uint64_t *)0)) & 0x7fffffff); > } > >