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Fri, 20 Nov 2020 08:26:48 +0000 (GMT) Received: from localhost.localdomain (unknown [9.145.40.141]) by d06av22.portsmouth.uk.ibm.com (Postfix) with ESMTP; Fri, 20 Nov 2020 08:26:48 +0000 (GMT) Subject: Re: [PATCH 1/2] pc-bios: s390x: Ensure Read IPL memory is clean To: Eric Farman , Thomas Huth , Cornelia Huck References: <20201119165729.63351-1-farman@linux.ibm.com> <20201119165729.63351-2-farman@linux.ibm.com> From: Janosch Frank Autocrypt: addr=frankja@linux.ibm.com; keydata= xsFNBFubpD4BEADX0uhkRhkj2AVn7kI4IuPY3A8xKat0ihuPDXbynUC77mNox7yvK3X5QBO6 qLqYr+qrG3buymJJRD9xkp4mqgasHdB5WR9MhXWKH08EvtvAMkEJLnqxgbqf8td3pCQ2cEpv 15mH49iKSmlTcJ+PvJpGZcq/jE42u9/0YFHhozm8GfQdb9SOI/wBSsOqcXcLTUeAvbdqSBZe zuMRBivJQQI1esD9HuADmxdE7c4AeMlap9MvxvUtWk4ZJ/1Z3swMVCGzZb2Xg/9jZpLsyQzb lDbbTlEeyBACeED7DYLZI3d0SFKeJZ1SUyMmSOcr9zeSh4S4h4w8xgDDGmeDVygBQZa1HaoL Esb8Y4avOYIgYDhgkCh0nol7XQ5i/yKLtnNThubAcxNyryw1xSstnKlxPRoxtqTsxMAiSekk 0m3WJwvwd1s878HrQNK0orWd8BzzlSswzjNfQYLF466JOjHPWFOok9pzRs+ucrs6MUwDJj0S cITWU9Rxb04XyigY4XmZ8dywaxwi2ZVTEg+MD+sPmRrTw+5F+sU83cUstuymF3w1GmyofgsU Z+/ldjToHnq21MNa1wx0lCEipCCyE/8K9B9bg9pUwy5lfx7yORP3JuAUfCYb8DVSHWBPHKNj HTOLb2g2UT65AjZEQE95U2AY9iYm5usMqaWD39pAHfhC09/7NQARAQABzSVKYW5vc2NoIEZy YW5rIDxmcmFua2phQGxpbnV4LmlibS5jb20+wsF3BBMBCAAhBQJbm6Q+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 jJbazsFNBFubpD4BEADAcUTRqXF/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 gqaWHZ4MEI2XTqH8wiwzPdCQPYsSE0fXWiYu7ObeErT6iLSTZGx4rQARAQABwsFfBBgBCAAJ 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: Fri, 20 Nov 2020 09:26:48 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.4.0 MIME-Version: 1.0 In-Reply-To: <20201119165729.63351-2-farman@linux.ibm.com> Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="bdOtaBNKDXzawcSz3pFUuC9j33HlRhPlt" X-TM-AS-GCONF: 00 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.312, 18.0.737 definitions=2020-11-20_03:2020-11-19, 2020-11-20 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 phishscore=0 lowpriorityscore=0 clxscore=1011 spamscore=0 mlxscore=0 bulkscore=0 malwarescore=0 suspectscore=0 mlxlogscore=999 impostorscore=0 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2009150000 definitions=main-2011200052 Received-SPF: pass client-ip=148.163.158.5; envelope-from=frankja@linux.ibm.com; helo=mx0b-001b2d01.pphosted.com X-Spam_score_int: -19 X-Spam_score: -2.0 X-Spam_bar: -- X-Spam_report: (-2.0 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_EF=-0.1, NICE_REPLY_A=-0.001, RCVD_IN_DNSWL_NONE=-0.0001, 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: Jason Herne , Matthew Rosato , qemu-devel@nongnu.org, Christian Borntraeger , qemu-s390x@nongnu.org, Jared Rossi 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) --bdOtaBNKDXzawcSz3pFUuC9j33HlRhPlt Content-Type: multipart/mixed; boundary="DzLuWKLC7dVfyGAPcPxcQpjtLlCmlLZIB"; protected-headers="v1" From: Janosch Frank To: Eric Farman , Thomas Huth , Cornelia Huck Cc: Christian Borntraeger , Jason Herne , Matthew Rosato , Jared Rossi , qemu-s390x@nongnu.org, qemu-devel@nongnu.org Message-ID: Subject: Re: [PATCH 1/2] pc-bios: s390x: Ensure Read IPL memory is clean References: <20201119165729.63351-1-farman@linux.ibm.com> <20201119165729.63351-2-farman@linux.ibm.com> In-Reply-To: <20201119165729.63351-2-farman@linux.ibm.com> --DzLuWKLC7dVfyGAPcPxcQpjtLlCmlLZIB Content-Type: multipart/mixed; boundary="------------EB7FB14DFFC2F78F4D0E2596" Content-Language: en-US This is a multi-part message in MIME format. --------------EB7FB14DFFC2F78F4D0E2596 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable On 11/19/20 5:57 PM, Eric Farman wrote: > If, for example, we boot off a virtio device and chreipl to a vfio-ccw > device, the space at lowcore will be non-zero. We build a Read IPL CCW > at address zero, but it will have leftover PSW data that will conflict > with the Format-0 CCW being generated: >=20 > 0x0: 00080000 80010000 > ------ Ccw0.cda > -- Ccw0.chainData > -- Reserved bits >=20 > The data address will be overwritten with the correct value (0x0), but > the apparent data chain bit will cause subsequent memory to be used as > the target of the data store, which may not be where we expect (0x0). >=20 > Clear out this space when we boot from DASD, so that we know it exists > exactly as we expect. >=20 > Signed-off-by: Eric Farman > Reviewed-by: Jason J. Herne > Acked-by: Christian Borntraeger Seems like I should have been more specific with my LGTM: Reviewed-by: Janosch Frank > --- > pc-bios/s390-ccw/dasd-ipl.c | 3 +++ > 1 file changed, 3 insertions(+) >=20 > diff --git a/pc-bios/s390-ccw/dasd-ipl.c b/pc-bios/s390-ccw/dasd-ipl.c > index 0fc879bb8e..71cbae2f16 100644 > --- a/pc-bios/s390-ccw/dasd-ipl.c > +++ b/pc-bios/s390-ccw/dasd-ipl.c > @@ -100,6 +100,9 @@ static void make_readipl(void) > { > Ccw0 *ccwIplRead =3D (Ccw0 *)0x00; > =20 > + /* Clear out any existing data */ > + memset(ccwIplRead, 0, sizeof(Ccw0)); > + > /* Create Read IPL ccw at address 0 */ > ccwIplRead->cmd_code =3D CCW_CMD_READ_IPL; > ccwIplRead->cda =3D 0x00; /* Read into address 0x00 in main memory= */ >=20 --------------EB7FB14DFFC2F78F4D0E2596 Content-Type: application/pgp-keys; name="OpenPGP_0xE354E6B8E238B9F8.asc" Content-Transfer-Encoding: quoted-printable Content-Disposition: attachment; filename="OpenPGP_0xE354E6B8E238B9F8.asc" -----BEGIN PGP PUBLIC KEY 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