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Wed, 14 Jan 2026 09:39:43 +0000 (GMT) Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=UTF-8 Date: Wed, 14 Jan 2026 10:39:38 +0100 Message-Id: From: "Christoph Schlameuss" Cc: , To: "Eric Farman" , "Christian Borntraeger" , "Janosch Frank" , "Claudio Imbrenda" , "David Hildenbrand" , "Christoph Schlameuss" Subject: Re: [PATCH] KVM: s390: vsie: retry SIE when unable to get vsie_page X-Mailer: aerc 0.21.0 References: <20251217030107.1729776-1-farman@linux.ibm.com> In-Reply-To: <20251217030107.1729776-1-farman@linux.ibm.com> X-TM-AS-GCONF: 00 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMTE0MDA3NSBTYWx0ZWRfX7VyZuMrcUO7e H1S97w+4eDYif0uBWx2HtAnFdQD7saoetXi7/3BI6WuhVG/D47f8ZVVKaVQrGtbysZQI2SN6lXj ZT0G04/9yNUbKrSXtOqAekIL5eWiVUl6kW6vNTcI0hLiJvLD1klkzv5fE2Ia8mnqGrniI6bdsoG H2uaXd8ghX2mr3seEhZzRS6T8mTOVPtrP8WThOxBpFQKh6hROc6BUDmglfk4wMROZU2mtjO0c5Z WnvYR6QUqYKAGw9qdpOUbZjoE4XiSpDBuGxcuNgkHzTU/lvXTRvztKEsQvlkSK7Yr2MQZOILgeA 8qM/ukEuYC9msri4Vc7/QjR7jqmSQCec5h2fRs0HSkYqlH9HNo6/YfTqc5Lu2bYQnAwwexS/sTU LEJK74jRT0KOCVPzOlyevF2ZGeXqvfSBYzRzytOha8SITtk1YXnH/qaA0Yot02yxOkMdd68MwWx S6P/hAlEMKtF58c6Grg== X-Proofpoint-GUID: LPxdp4CtDSjh9h2o3rBA0Y6BIr7NRxxb X-Authority-Analysis: v=2.4 cv=WLJyn3sR c=1 sm=1 tr=0 ts=69676464 cx=c_pps a=5BHTudwdYE3Te8bg5FgnPg==:117 a=5BHTudwdYE3Te8bg5FgnPg==:17 a=IkcTkHD0fZMA:10 a=vUbySO9Y5rIA:10 a=VkNPw1HP01LnGYTKEx00:22 a=VnNF1IyMAAAA:8 a=K6PXcvzj_mSOQNv_xU4A:9 a=NqO74GWdXPXpGKcKHaDJD/ajO6k=:19 a=QEXdDO2ut3YA:10 X-Proofpoint-ORIG-GUID: LPxdp4CtDSjh9h2o3rBA0Y6BIr7NRxxb X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1121,Hydra:6.1.9,FMLib:17.12.100.49 definitions=2026-01-14_02,2026-01-09_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 adultscore=0 malwarescore=0 phishscore=0 suspectscore=0 priorityscore=1501 bulkscore=0 clxscore=1011 impostorscore=0 lowpriorityscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.19.0-2512120000 definitions=main-2601140075 On Wed Dec 17, 2025 at 4:01 AM CET, Eric Farman wrote: > SIE may exit because of pending host work, such as handling an interrupt, > in which case VSIE rewinds the guest PSW such that it is transparently > resumed (see Fixes tag). There is still one scenario where those conditio= ns > are not present, but that the VSIE processor returns with effectively rc= =3D0, > resulting in additional (and unnecessary) guest work to be performed. > > For this case, rewind the guest PSW as we do in the other non-error exits= . > > Fixes: 33a729a1770b ("KVM: s390: vsie: retry SIE instruction on host inte= rcepts") > Signed-off-by: Eric Farman LGTM Reviewed-by: Christoph Schlameuss