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Wed, 15 Jul 2020 14:08:25 GMT Received: from d06av24.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 67EC942049; Wed, 15 Jul 2020 14:08:25 +0000 (GMT) Received: from d06av24.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id C045642045; Wed, 15 Jul 2020 14:08:24 +0000 (GMT) Received: from linux01.pok.stglabs.ibm.com (unknown [9.114.17.81]) by d06av24.portsmouth.uk.ibm.com (Postfix) with ESMTP; Wed, 15 Jul 2020 14:08:24 +0000 (GMT) From: Janosch Frank To: qemu-devel@nongnu.org Subject: [PATCH] pc-bios: s390x: Add a comment to the io and external new PSW setup Date: Wed, 15 Jul 2020 10:08:20 -0400 Message-Id: <20200715140820.3401-1-frankja@linux.ibm.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <033b0db7-7b7d-6eb0-9018-bcc342f13509@de.ibm.com> References: <033b0db7-7b7d-6eb0-9018-bcc342f13509@de.ibm.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.235, 18.0.687 definitions=2020-07-15_11:2020-07-15, 2020-07-15 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 bulkscore=0 mlxlogscore=944 malwarescore=0 spamscore=0 impostorscore=0 adultscore=0 lowpriorityscore=0 phishscore=0 suspectscore=1 mlxscore=0 priorityscore=1501 clxscore=1015 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2006250000 definitions=main-2007150111 Received-SPF: pass client-ip=148.163.158.5; envelope-from=frankja@linux.ibm.com; helo=mx0a-001b2d01.pphosted.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/07/15 09:18:04 X-ACL-Warn: Detected OS = Linux 3.x [generic] X-Spam_score_int: -35 X-Spam_score: -3.6 X-Spam_bar: --- X-Spam_report: (-3.6 / 5.0 requ) BAYES_00=-1.9, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H2=-1, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action 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: borntraeger@de.ibm.com, thuth@redhat.com, cohuck@redhat.com, david@redhat.com Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" Normally they don't need to be set up before waiting for an interrupt but are set up on boot. The BIOS however might overwrite the lowcore (and hence the PSWs) when loading a blob into memory and therefore needs to set up those PSWs more often. Signed-off-by: Janosch Frank --- pc-bios/s390-ccw/start.S | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-) diff --git a/pc-bios/s390-ccw/start.S b/pc-bios/s390-ccw/start.S index 01c4c21b26..b0fcb918cc 100644 --- a/pc-bios/s390-ccw/start.S +++ b/pc-bios/s390-ccw/start.S @@ -64,7 +64,10 @@ consume_sclp_int: stctg %c0,%c0,0(%r15) oi 6(%r15),0x2 lctlg %c0,%c0,0(%r15) - /* prepare external call handler */ + /* + * Prepare external new PSW as it might have been overwritten + * by a loaded blob + */ larl %r1, external_new_code stg %r1, 0x1b8 larl %r1, external_new_mask @@ -84,7 +87,10 @@ consume_io_int: stctg %c6,%c6,0(%r15) oi 4(%r15), 0xff lctlg %c6,%c6,0(%r15) - /* prepare i/o call handler */ + /* + * Prepare i/o new PSW as it might have been overwritten + * by a loaded blob + */ larl %r1, io_new_code stg %r1, 0x1f8 larl %r1, io_new_mask -- 2.25.1