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Wed, 15 Jul 2026 14:21:32 +0000 (GMT) Received: from [9.111.23.116] (unknown [9.111.23.116]) by smtpav02.fra02v.mail.ibm.com (Postfix) with ESMTP; Wed, 15 Jul 2026 14:21:32 +0000 (GMT) Message-ID: <296aa86b-6caf-4b4d-bb4e-8a25876cf48e@linux.ibm.com> Date: Wed, 15 Jul 2026 16:21:32 +0200 Precedence: bulk X-Mailing-List: linux-s390@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 16/21] KVM: s390: vsie: Shadow VSIE SCA in guest-1 To: Christoph Schlameuss , kvm@vger.kernel.org, linux-s390@vger.kernel.org Cc: David Hildenbrand , Heiko Carstens , Vasily Gorbik , Alexander Gordeev , Christian Borntraeger , Claudio Imbrenda , Nico Boehr , Sven Schnelle , Paolo Bonzini , Shuah Khan , Eric Farman References: <20260709-vsie-sigpi-v1-0-ea9f12066408@linux.ibm.com> <20260709-vsie-sigpi-v1-16-ea9f12066408@linux.ibm.com> Content-Language: en-US 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 In-Reply-To: <20260709-vsie-sigpi-v1-16-ea9f12066408@linux.ibm.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-TM-AS-GCONF: 00 X-Proofpoint-GUID: YPX3cX6cnsOs5HKSCe0PtiqHTrS47T4a X-Proofpoint-Spam-Info: AW1haW4tMjYwNzE1MDE0MSBTYWx0ZWRfX9tjMzAnbeOXM fIqUul4oBXIkFTSaLWsX4rbEe/YA5zGIbQrXQM1yDk05QFd5UF/kLVOYYpg0DUBJy6omoPV9xV6 Av4yengJsMvlofrSn8L5wC9wuAdi+DE= X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNzE1MDE0MSBTYWx0ZWRfX1yYEXozUiU2n F11A1C3F8Nkr46OHFKSaVTB1TVqAFTk2Lztzb75EwDLv5NL/LlOMddwyo4ReO8AL9YW7/U80wtg ftuTtN6w4X0TsQd6HoeeFxxX/Hj9uCMgcAGHiXO3L8a//xJ3saH08yFiU/8CFRLRiEKPNVwF1eW H/+k7cVv2oW1PcutPlhWJ8bLFxyI7Vz+z6PfEbGRFzLAgz8kZdKJArFWdb87GqYFmE3doj/Zt3W TuGrcF4AOWrsgPjgPPqp9wn4H6g83as1+CtZpyhloQeGSpZ2mFgUNwyUOKu7SlmW8+21b8hGwLP /3OJWEfMHlT0dkQbP2fOP/ho99pwOjuh10FHOCkIJSxFWH0O/B8qThPIouaS8fzgspfKhX/lJ+y IOcknsF1qh1mDDcPCKcXIa4Ix9mzem9ujAXI2lk1JgcKxfB84+9vvIdQgG9qOvLq7er4ISySASB eL2d1J6EZrLGnzeg8dQ== X-Authority-Analysis: v=2.4 cv=XbS5Co55 c=1 sm=1 tr=0 ts=6a579772 cx=c_pps a=AfN7/Ok6k8XGzOShvHwTGQ==:117 a=AfN7/Ok6k8XGzOShvHwTGQ==:17 a=IkcTkHD0fZMA:10 a=RAioF0-LDSMA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=iQ6ETzBq9ecOQQE5vZCe:22 a=VnNF1IyMAAAA:8 a=2prQhZuATWbUqhegNzEA:9 a=QEXdDO2ut3YA:10 X-Proofpoint-ORIG-GUID: YPX3cX6cnsOs5HKSCe0PtiqHTrS47T4a X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-07-15_03,2026-07-15_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 clxscore=1015 suspectscore=0 spamscore=0 phishscore=0 lowpriorityscore=0 priorityscore=1501 adultscore=0 malwarescore=0 impostorscore=0 bulkscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2607150141 On 7/9/26 17:15, Christoph Schlameuss wrote: > Restructure kvm_s390_handle_vsie() to create a guest-1 shadow of the SCA > if guest-2 attempts to enter SIE with an SCA. If the SCA is used the > vsie_pages are stored in a new vsie_sca struct instead of the arch vsie > struct. > > When the VSIE-Interpretation-Extension Facility is active the shadow SCA > (ssca_block) will be created and shadows of all CPUs defined in the > configuration are created. SCAOL/H in the VSIE control block are > overwritten with references to the shadow SCA. > > The shadow SCA contains the addresses of the original guest-3 SCA as > well as the original VSIE control blocks. With these addresses the > machine can directly monitor the intervention bits within the original > SCA entries, enabling it to handle SENSE_RUNNING and EXTERNAL_CALL sigp > instructions without exiting VSIE. > > The original SCA will be pinned in guest-2 memory and only be unpinned > before reuse. This means some pages might still be pinned even after the > guest 3 VM does no longer exist. > > The vsie_scas including the ssca_blocks are also kept within a map to > reuse already existing ssca_blocks efficiently. While the map and array > with references to the vsie_scas are held in the arch vsie struct. The > use of vsie_scas is tracked using an ref_count. > > Signed-off-by: Christoph Schlameuss > --- [...] > +/* > + * Try to find the address of an existing shadow system control area. > + * @sca_o_gpa: original system control area address; guest-2 physical > + * > + * Called with lock on vsie_sca_lock. > + */ > +static struct vsie_sca *get_existing_vsie_sca(struct kvm *kvm, hpa_t sca_o_gpa) > +{ > + struct vsie_sca *vsie_sca = xa_load(&kvm->arch.vsie.osca_to_sca, sca_o_gpa >> 6); s/6/SSCA_ALIGNMENT_SHIFT/