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Wed, 2 Sep 2020 10:30:26 +0000 (GMT) Received: from localhost.localdomain (unknown [9.145.35.147]) by d06av24.portsmouth.uk.ibm.com (Postfix) with ESMTP; Wed, 2 Sep 2020 10:30:26 +0000 (GMT) Subject: Re: [PATCH v3 4/5] pc-bios: s390x: Save io and external new PSWs before overwriting them To: Thomas Huth , qemu-devel@nongnu.org References: <20200831150910.317171-1-frankja@linux.ibm.com> <20200831150910.317171-5-frankja@linux.ibm.com> From: Janosch Frank Autocrypt: addr=frankja@linux.ibm.com; prefer-encrypt=mutual; keydata= mQINBFubpD4BEADX0uhkRhkj2AVn7kI4IuPY3A8xKat0ihuPDXbynUC77mNox7yvK3X5QBO6 qLqYr+qrG3buymJJRD9xkp4mqgasHdB5WR9MhXWKH08EvtvAMkEJLnqxgbqf8td3pCQ2cEpv 15mH49iKSmlTcJ+PvJpGZcq/jE42u9/0YFHhozm8GfQdb9SOI/wBSsOqcXcLTUeAvbdqSBZe zuMRBivJQQI1esD9HuADmxdE7c4AeMlap9MvxvUtWk4ZJ/1Z3swMVCGzZb2Xg/9jZpLsyQzb lDbbTlEeyBACeED7DYLZI3d0SFKeJZ1SUyMmSOcr9zeSh4S4h4w8xgDDGmeDVygBQZa1HaoL Esb8Y4avOYIgYDhgkCh0nol7XQ5i/yKLtnNThubAcxNyryw1xSstnKlxPRoxtqTsxMAiSekk 0m3WJwvwd1s878HrQNK0orWd8BzzlSswzjNfQYLF466JOjHPWFOok9pzRs+ucrs6MUwDJj0S cITWU9Rxb04XyigY4XmZ8dywaxwi2ZVTEg+MD+sPmRrTw+5F+sU83cUstuymF3w1GmyofgsU Z+/ldjToHnq21MNa1wx0lCEipCCyE/8K9B9bg9pUwy5lfx7yORP3JuAUfCYb8DVSHWBPHKNj HTOLb2g2UT65AjZEQE95U2AY9iYm5usMqaWD39pAHfhC09/7NQARAQABtCVKYW5vc2NoIEZy YW5rIDxmcmFua2phQGxpbnV4LmlibS5jb20+iQI3BBMBCAAhBQJbm6Q+AhsjBQsJCAcCBhUI CQoLAgQWAgMBAh4BAheAAAoJEONU5rjiOLn4p9gQALjkdj5euJVI2nNT3/IAxAhQSmRhPEt0 AmnCYnuTcHRWPujNr5kqgtyER9+EMQ0ZkX44JU2q7OWxTdSNSAN/5Z7qmOR9JySvDOf4d3mS bMB5zxL9d8SbnSs1uW96H9ZBTlTQnmLfsiM9TetAjSrR8nUmjGhe2YUhJLR1v1LguME+YseT eXnLzIzqqpu311/eYiiIGcmaOjPCE+vFjcXL5oLnGUE73qSYiujwhfPCCUK0850o1fUAYq5p CNBCoKT4OddZR+0itKc/cT6NwEDwdokeg0+rAhxb4Rv5oFO70lziBplEjOxu3dqgIKbHbjza EXTb+mr7VI9O4tTdqrwJo2q9zLqqOfDBi7NDvZFLzaCewhbdEpDYVu6/WxprAY94hY3F4trT rQMHJKQENtF6ZTQc9fcT5I3gAmP+OEvDE5hcTALpWm6Z6SzxO7gEYCnF+qGXqp8sJVrweMub UscyLqHoqdZC2UG4LQ1OJ97nzDpIRe0g6oJ9ZIYHKmfw5jjwH6rASTld5MFWajWdNsqK15k/ RZnHAGICKVIBOBsq26m4EsBlfCdt3b/6emuBjUXR1pyjHMz2awWzCq6/6OWs5eANZ0sdosNq dq2v0ULYTazJz2rlCXV89qRa7ukkNwdBSZNEwsD4eEMicj1LSrqWDZMAALw50L4jxaMD7lPL jJbauQINBFubpD4BEADAcUTRqXF/aY53OSH7IwIK9lFKxIm0IoFkOEh7LMfp7FGzaP7ANrZd cIzhZi38xyOkcaFY+npGEWvko7rlIAn0JpBO4x3hfhmhBD/WSY8LQIFQNNjEm3vzrMo7b9Jb JAqQxfbURY3Dql3GUzeWTG9uaJ00u+EEPlY8zcVShDltIl5PLih20e8xgTnNzx5c110lQSu0 iZv2lAE6DM+2bJQTsMSYiwKlwTuv9LI9Chnoo6+tsN55NqyMxYqJgElk3VzlTXSr3+rtSCwf tq2cinETbzxc1XuhIX6pu/aCGnNfuEkM34b7G1D6CPzDMqokNFbyoO6DQ1+fW6c5gctXg/lZ 602iEl4C4rgcr3+EpfoPUWzKeM8JXv5Kpq4YDxhvbitr8Dm8gr38+UKFZKlWLlwhQ56r/zAU v6LIsm11GmFs2/cmgD1bqBTNHHcTWwWtRTLgmnqJbVisMJuYJt4KNPqphTWsPY8SEtbufIlY HXOJ2lqUzOReTrie2u0qcSvGAbSfec9apTFl2Xko/ddqPcZMpKhBiXmY8tJzSPk3+G4tqur4 6TYAm5ouitJsgAR61Cu7s+PNuq/pTLDhK+6/Njmc94NGBcRA4qTuysEGE79vYWP2oIAU4Fv6 gqaWHZ4MEI2XTqH8wiwzPdCQPYsSE0fXWiYu7ObeErT6iLSTZGx4rQARAQABiQIfBBgBCAAJ BQJbm6Q+AhsMAAoJEONU5rjiOLn4DDEP/RuyckW65SZcPG4cMfNgWxZF8rVjeVl/9PBfy01K 8R0hajU40bWtXSMiby7j0/dMjz99jN6L+AJHJvrLz4qYRzn2Ys843W+RfXj62Zde4YNBE5SL jJweRCbMWKaJLj6499fctxTyeb9+AMLQS4yRSwHuAZLmAb5AyCW1gBcTWZb8ON5BmWnRqeGm IgC1EvCnHy++aBnHTn0m+zV89BhTLTUal35tcjUFwluBY39R2ux/HNlBO1GY3Z+WYXhBvq7q katThLjaQSmnOrMhzqYmdShP1leFTVbzXUUIYv/GbynO/YrL2gaQpaP1bEUEi8lUAfXJbEWG dnHFkciryi092E8/9j89DJg4mmZqOau7TtUxjRMlBcIliXkzSLUk+QvD4LK1kWievJse4mte FBdkWHfP4BH/+8DxapRcG1UAheSnSRQ5LiO50annOB7oXF+vgKIaie2TBfZxQNGAs3RQ+bga DchCqFm5adiSP5+OT4NjkKUeGpBe/aRyQSle/RropTgCi85pje/juYEn2P9UAgkfBJrOHvQ9 Z+2Sva8FRd61NJLkCJ4LFumRn9wQlX2icFbi8UDV3do0hXJRRYTWCxrHscMhkrFWLhYiPF4i phX7UNdOWBQ90qpHyAxHmDazdo27gEjfvsgYMdveKknEOTEb5phwxWgg7BcIDoJf9UMC Message-ID: Date: Wed, 2 Sep 2020 12:30:25 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.8.0 MIME-Version: 1.0 In-Reply-To: Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="PyLWfbK3u4cZZEFVCmUFWbro9QlipQS44" X-TM-AS-GCONF: 00 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.235, 18.0.687 definitions=2020-09-02_03:2020-09-02, 2020-09-02 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 lowpriorityscore=0 suspectscore=0 priorityscore=1501 adultscore=0 clxscore=1015 mlxscore=0 malwarescore=0 phishscore=0 spamscore=0 bulkscore=0 impostorscore=0 mlxlogscore=999 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2006250000 definitions=main-2009020089 Received-SPF: pass client-ip=148.163.156.1; envelope-from=frankja@linux.ibm.com; helo=mx0a-001b2d01.pphosted.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/09/02 06:30:32 X-ACL-Warn: Detected OS = Linux 3.x [generic] [fuzzy] X-Spam_score_int: -47 X-Spam_score: -4.8 X-Spam_bar: ---- X-Spam_report: (-4.8 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_EF=-0.1, NICE_REPLY_A=-2.13, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H2=-0.001, 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, cohuck@redhat.com, david@redhat.com Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --PyLWfbK3u4cZZEFVCmUFWbro9QlipQS44 Content-Type: multipart/mixed; boundary="tYPFgodtDiPj5vX2bLuYTrRsfJA67mQ2I" --tYPFgodtDiPj5vX2bLuYTrRsfJA67mQ2I Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: quoted-printable On 9/1/20 7:22 PM, Thomas Huth wrote: > On 31/08/2020 17.09, Janosch Frank wrote: >> Currently we always overwrite the mentioned exception new PSWs before >> loading the enabled wait PSW. Let's save the PSW before overwriting >> and restore it right before starting the loaded kernel. >> >> Signed-off-by: Janosch Frank >> --- >> pc-bios/s390-ccw/jump2ipl.c | 4 +++ >> pc-bios/s390-ccw/netmain.c | 3 ++ >> pc-bios/s390-ccw/start.S | 62 +++++++++++++++++++++++++++---------= - >> 3 files changed, 52 insertions(+), 17 deletions(-) >=20 > Patch looks basically fine to me, I just got some questions for my > understanding below... >=20 >> diff --git a/pc-bios/s390-ccw/jump2ipl.c b/pc-bios/s390-ccw/jump2ipl.c= >> index 5b8352d257..bb94ba7550 100644 >> --- a/pc-bios/s390-ccw/jump2ipl.c >> +++ b/pc-bios/s390-ccw/jump2ipl.c >> @@ -14,6 +14,7 @@ >> #define RESET_PSW_MASK (PSW_MASK_SHORTPSW | PSW_MASK_64) >> #define RESET_PSW ((uint64_t)&jump_to_IPL_addr | RESET_PSW_MASK) >> =20 >> +extern uint64_t psw_save_io[], psw_save_ext[]; >> static uint64_t *reset_psw =3D 0, save_psw, ipl_continue; >> =20 >> void write_reset_psw(uint64_t psw) >> @@ -59,6 +60,9 @@ void jump_to_IPL_code(uint64_t address) >> /* Ensure the guest output starts fresh */ >> sclp_print("\n"); >> =20 >> + memcpy(&lowcore->io_new_psw, psw_save_io, 16); >> + memcpy(&lowcore->external_new_psw, psw_save_ext, 16); >> + >> /* >> * HACK ALERT. >> * We use the load normal reset to keep r15 unchanged. jump_to_IP= L_2 >> diff --git a/pc-bios/s390-ccw/netmain.c b/pc-bios/s390-ccw/netmain.c >> index 056e93a818..74ef28fbc6 100644 >> --- a/pc-bios/s390-ccw/netmain.c >> +++ b/pc-bios/s390-ccw/netmain.c >> @@ -32,6 +32,7 @@ >> #include >> #include >> =20 >> +#include "s390-arch.h" >> #include "s390-ccw.h" >> #include "cio.h" >> #include "virtio.h" >> @@ -43,6 +44,8 @@ >> extern char _start[]; >> void write_iplb_location(void) {} >> =20 >> +LowCore *lowcore; /* Yes, this *is* a pointer to address 0 */ >> + >> #define KERNEL_ADDR ((void *)0L) >> #define KERNEL_MAX_SIZE ((long)_start) >> #define ARCH_COMMAND_LINE_SIZE 896 /* Taken from Linux = kernel */ >> diff --git a/pc-bios/s390-ccw/start.S b/pc-bios/s390-ccw/start.S >> index ce519300a1..939aac3a7c 100644 >> --- a/pc-bios/s390-ccw/start.S >> +++ b/pc-bios/s390-ccw/start.S >> @@ -34,7 +34,17 @@ remainder: >> larl %r2,memsetxc >> ex %r3,0(%r2) >> done: >> - j main /* And call C */ >> + /* prepare i/o call handler */ >> + larl %r1, io_new_code >> + larl %r2, io_new_psw >> + stg %r1, 8(%r2) >> + mvc 0x1f0(16),0(%r2) >> + /* prepare external call handler */ >> + larl %r1, external_new_code >> + larl %r2, external_new_psw >> + stg %r1, 8(%r2) >=20 > Can't you specify the external_new_code and io_new_code in the > external_new_psw / io_new_psw directly? Or is our relocation code not > good enough for this? Initially I had some problems with this. I just had another try and it seems to work well, but as the testing infrastructure doesn't really work, I can't vouch for that. >=20 >> + mvc 0x1b0(16),0(%r2) >> + j main /* And call C */ >> =20 >> memsetxc: >> xc 0(1,%r1),0(%r1) >> @@ -64,13 +74,16 @@ consume_sclp_int: >> oi 6(%r15),0x2 >> lctlg %c0,%c0,0(%r15) >> /* prepare external call handler */ >> - larl %r1, external_new_code >> - stg %r1, 0x1b8 >> - larl %r1, external_new_mask >> - mvc 0x1b0(8),0(%r1) >> - /* load enabled wait PSW */ >> - larl %r1, enabled_wait_psw >> - lpswe 0(%r1) >> + larl %r1, external_new_psw >> + lghi %r2, 0x1b0 >> + /* Is the BIOS' external new PSW already set? */ >> + clc 0(16, %r1), 0(%r2) >> + je load_ewait >> + /* No, save old PSW and write BIOS PSW */ >> + larl %r3, psw_save_ext >> + mvc 0(16, %r3), 0x1b0 >> + mvc 0x1b0(16),0(%r1) >> + j load_ewait >> =20 >> /* >> * void consume_io_int(void) >> @@ -84,11 +97,20 @@ consume_io_int: >> oi 4(%r15), 0xff >> lctlg %c6,%c6,0(%r15) >> /* prepare i/o call handler */ >> - larl %r1, io_new_code >> - stg %r1, 0x1f8 >> - larl %r1, io_new_mask >> - mvc 0x1f0(8),0(%r1) >> - /* load enabled wait PSW */ >> + larl %r1, io_new_psw >> + lghi %r2, 0x1f0 >> + /* Is the BIOS' PSW already set? */ >> + larl %r3, load_ewait >> + clc 0(16, %r1), 0(%r2) >> + bcr 8, %r3 >=20 > Why not a "je load_ewait" again, like in the consume_sclp_int handler? Great question >=20 >> + /* No, save old PSW and write BIOS PSW */ >> + larl %r3, psw_save_io >> + mvc 0(16, %r3), 0x1f0 >> + mvc 0x1f0(16),0(%r1) >> + j load_ewait >> + >> +load_ewait: >> + /* PSW is the correct one, time to load the enabled wait PSW = */ >> larl %r1, enabled_wait_psw >> lpswe 0(%r1) >> =20 >> @@ -107,11 +129,17 @@ io_new_code: >> br %r14 >> =20 >> .align 8 >> + .globl psw_save_io >> + .globl psw_save_ext >> disabled_wait_psw: >> .quad 0x0002000180000000,0x0000000000000000 >> enabled_wait_psw: >> .quad 0x0302000180000000,0x0000000000000000 >> -external_new_mask: >> - .quad 0x0000000180000000 >> -io_new_mask: >> - .quad 0x0000000180000000 >> +external_new_psw: >> + .quad 0x0000000180000000,0 >> +io_new_psw: >> + .quad 0x0000000180000000,0 >> +psw_save_io: >> + .quad 0,0 >> +psw_save_ext: >> + .quad 0,0 >> >=20 > In case you respin, could you maybe add some local #defines for 0x1f0 > and 0x1b0 ? At the top of this file? >=20 > Thomas >=20 --tYPFgodtDiPj5vX2bLuYTrRsfJA67mQ2I-- --PyLWfbK3u4cZZEFVCmUFWbro9QlipQS44 Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- iQIzBAEBCAAdFiEEwGNS88vfc9+v45Yq41TmuOI4ufgFAl9PdEEACgkQ41TmuOI4 ufhk6g//ZZwtJEdBl6PxNAyDGc4Bl4mXHYzXYuU9fIDBl8UjKDZO4zXqgN3QsjeI AdRtH5LYpY5/JfFCeRnoczBbCv4oD3jt7ImXgsX6RNRqq3jk6PiBRilr2XKMjiT1 JrLwihYVqKKctWRjEwLv7t94aepyYrB8axspNuldqyAbSQ57I60xws7Fr9TRQHdT TX5loiKd4/kXQbOex8gP3+/r+Rz2FD5jLmTZ6vdSSm6aVkJ7AAFfoQqrdbrIQb6b A3XTnaw3D54g3l69Kq8Lgdb3ajPIXZmIGY2ajZPjLZz0FsEr2e8wItOYEqQUUqDk euyAPzlazOVoL9sO8hl+NHmeB0r6SRrB6WHAblSTwnBVwvKGvtRyb56C+AZiS+y5 cuGQjsop2U5HgD8SgqkIAmj74MQiQ/awFlUOi0KvtDE/+NsJBNoqTFh9+IYtBB3S VKUCNdC2kPRGA2Fa0n9WiZvmhbFvOO3K9pafn6EyA3Bm4eNrD5MHb9u5rzWO8NmG LhE8NZDaGxTeXxT4wh8SzPvPUDzvh9LoOmRGmFIyWK/6m0SLrNr/z9kuHn6YnjTI DtploAOM1fvLs1PznzrOURf7kbOtAaMPwjnhht6G/sDw+ZKdNyogrYq6RNc/St40 Kgw0GzhaCljSuscbrCZJ98wM4bITQPdwWLFiNez4W54MurYNOP4= =gwds -----END PGP SIGNATURE----- --PyLWfbK3u4cZZEFVCmUFWbro9QlipQS44--