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Mon, 22 Jun 2026 16:07:40 +0000 (GMT) Received: from p-imbrenda.ehn-de.ibm.com (unknown [9.224.75.30]) by smtpav06.fra02v.mail.ibm.com (Postfix) with ESMTP; Mon, 22 Jun 2026 16:07:40 +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, hca@linux.ibm.com, gerald.schaefer@linux.ibm.com, gor@linux.ibm.com, agordeev@linux.ibm.com, svens@linux.ibm.com Subject: [PATCH v5 3/9] KVM: s390: Do not set special large pages dirty Date: Mon, 22 Jun 2026 18:07:33 +0200 Message-ID: <20260622160739.202044-4-imbrenda@linux.ibm.com> X-Mailer: git-send-email 2.54.0 In-Reply-To: <20260622160739.202044-1-imbrenda@linux.ibm.com> References: <20260622160739.202044-1-imbrenda@linux.ibm.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNjIyMDE1NyBTYWx0ZWRfX/0HUHVKRwNVD NGERwmaNdAD5tWAJ+NaDJzGP+HeU0RP1aiE8bRYC0qZ8+Nb4RCyi8DuxD7S/YDYZJiNJOIwx4HA W6wloYroLT0XP5DjzJtMYs6gimabgov3q08st2Rj14VwQ8NvXitIygQQ3ROe1l5iPpfWpnTIfU8 LCvgVZtvG2PxoH+MKgW1GbCBGFACUFstf/ixBWleppaYNBNqxJd3ZEPHSDcbgCeS2munDUrrv/l nWAL7wbW/2EZ+O4QNJe45lP37T5t/Eqmx1vLosSEV1LERSQO05KOAp38mw0BmQyBiPSIKtfBXmE haR5ypcJFuqKe2neSwONofUC8OndmC5NYsl+QlMhSpbasLFY34tLrauIYUmPL7CBaxHx6GI3y6Q /PL5aasnhvy5+uqlIDe7A1isSRf5JMpqHvhhpfGOgSqYWW2HGaR2ZTSI5mcfLtTIIpnwB74+2a9 eMO2LA2DClOZF6uCLkA== X-Proofpoint-GUID: MvTLhkZ2HEy-tV2hhchgu9DjVY9WNulo X-Proofpoint-Spam-Info: AW1haW4tMjYwNjIyMDE1NyBTYWx0ZWRfXxrEarLo3xy6L 0NJqMCiDdICzgraGZ42s2gMBm/JcbPVxwIwJInGadXpWYKDAscZPvlZmfuxhcwTvDEY3tx94Vpm LQyp6pAflTQJRSXGjazSmxaxLqCkMJs= X-Authority-Analysis: v=2.4 cv=I/lVgtgg c=1 sm=1 tr=0 ts=6a395dd1 cx=c_pps a=5BHTudwdYE3Te8bg5FgnPg==:117 a=5BHTudwdYE3Te8bg5FgnPg==:17 a=FelO9ux0wxsA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=RzCfie-kr_QcCd8fBx8p:22 a=VnNF1IyMAAAA:8 a=NX4vPgGMuaxhIts7GPsA:9 X-Proofpoint-ORIG-GUID: MvTLhkZ2HEy-tV2hhchgu9DjVY9WNulo X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.125,FMLib:17.12.100.49 definitions=2026-06-22_03,2026-06-22_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 lowpriorityscore=0 spamscore=0 phishscore=0 clxscore=1015 priorityscore=1501 adultscore=0 impostorscore=0 bulkscore=0 suspectscore=0 malwarescore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2606220157 Special pages / folios should not be set dirty. This also applies to large pages. Add a missing check in gmap_clear_young_crste() to prevent setting the large page dirty if it is a special page. Signed-off-by: Claudio Imbrenda Fixes: a2c17f9270cc ("KVM: s390: New gmap code") --- arch/s390/kvm/gmap.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/s390/kvm/gmap.c b/arch/s390/kvm/gmap.c index 52d55ddea8d4..3192f610f696 100644 --- a/arch/s390/kvm/gmap.c +++ b/arch/s390/kvm/gmap.c @@ -327,7 +327,7 @@ static long gmap_clear_young_crste(union crste *crstep, gfn_t gfn, gfn_t end, st new.h.i = 1; new.s.fc1.y = 0; new.s.fc1.prefix_notif = 0; - if (new.s.fc1.d || !new.h.p) + if ((new.s.fc1.d || !new.h.p) && !new.s.fc1.s) folio_set_dirty(phys_to_folio(crste_origin_large(crste))); new.s.fc1.d = 0; new.h.p = 1; -- 2.54.0