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Tue, 12 May 2026 17:52:53 +0000 (GMT) Received: from p-imbrenda.aag-de.ibm.com (unknown [9.52.223.175]) by smtpav06.fra02v.mail.ibm.com (Postfix) with ESMTP; Tue, 12 May 2026 17:52:53 +0000 (GMT) From: Claudio Imbrenda To: linux-kernel@vger.kernel.org Cc: kvm@vger.kernel.org, linux-s390@vger.kernel.org, borntraeger@de.ibm.com, frankja@linux.ibm.com, david@kernel.org, seiden@linux.ibm.com, nrb@linux.ibm.com, schlameuss@linux.ibm.com, gra@linux.ibm.com Subject: [PATCH v2 5/5] KVM: s390: Properly reset zero bit in PGSTE Date: Tue, 12 May 2026 19:52:51 +0200 Message-ID: <20260512175251.300882-6-imbrenda@linux.ibm.com> X-Mailer: git-send-email 2.54.0 In-Reply-To: <20260512175251.300882-1-imbrenda@linux.ibm.com> References: <20260512175251.300882-1-imbrenda@linux.ibm.com> Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Authority-Analysis: v=2.4 cv=KbvidwYD c=1 sm=1 tr=0 ts=6a0368fb cx=c_pps a=aDMHemPKRhS1OARIsFnwRA==:117 a=aDMHemPKRhS1OARIsFnwRA==:17 a=NGcC8JguVDcA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=V8glGbnc2Ofi9Qvn3v5h:22 a=VnNF1IyMAAAA:8 a=qr9DHn0TZOiEmrbJNPYA:9 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNTEyMDE4MyBTYWx0ZWRfX1vFq4jFiZugj Li5NVIcLe7ZLWLEx+NPkMh0Qa/JBd13yyv0tLIIPrmW48jyjfgMJihGAytMQxAw9usllt1WU8T7 4dERQ5/FJsbq+SPowZIer6aMcuKECBOAQH63lXDNFZ1fM7HyGb79kqBHBOQr3MzC9hFrRF1FZxq UQ3jodytlHSHo6UtkW0AVOBM7IE8lVoDTNua8jWmzzAm3rCDTHiGuldjUQ1vmbes3VN017eR5sk tm5XBCPRjsn1kJlq/hCaUQ5gSNsiqSAUjwfsPcNuXElsym4JUo4H/TOcBh9v9glr5z7fduphJGC VjzvOjhNlRFmIlZ5KZs0eHLAaCaKv/pw7kPen46a7LRI2W6M70S+EBCgD0FWirqa3QbwbGUYIkY ///o7JtMnUynALW26V1qC/eWCexdc0o0v7YHnRtlyq91pvXxdgLLhOsLzgdSkdpK9ue2lh2PKpI /M53ndr3SBLk42gx8HQ== X-Proofpoint-GUID: 5T6wxvpYxQmgyavdGosQkrEGQYC-6Y6_ X-Proofpoint-ORIG-GUID: 5T6wxvpYxQmgyavdGosQkrEGQYC-6Y6_ X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-05-11_05,2026-05-08_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 bulkscore=0 impostorscore=0 malwarescore=0 lowpriorityscore=0 phishscore=0 spamscore=0 suspectscore=0 clxscore=1015 adultscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2605050000 definitions=main-2605120183 When calling _gmap_ptep_xchg(), always clear the pgste.zero bit. This prevents the page from being accidentally discarded when getting unmapped. Signed-off-by: Claudio Imbrenda --- arch/s390/kvm/gmap.h | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/s390/kvm/gmap.h b/arch/s390/kvm/gmap.h index e490f2995a26..4de9ed8d58ba 100644 --- a/arch/s390/kvm/gmap.h +++ b/arch/s390/kvm/gmap.h @@ -199,6 +199,7 @@ static inline union pgste _gmap_ptep_xchg(struct gmap *gmap, union pte *ptep, un } if (!ptep->s.d && newpte.s.d && !newpte.s.s) SetPageDirty(pfn_to_page(newpte.h.pfra)); + pgste.zero = 0; return __dat_ptep_xchg(ptep, pgste, newpte, gfn, gmap->asce, uses_skeys(gmap)); } -- 2.54.0