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Wed, 24 Sep 2025 12:31:02 +0000 (GMT) Date: Wed, 24 Sep 2025 14:31:01 +0200 From: Claudio Imbrenda To: David Hildenbrand Cc: Gautam Gala , Alexander Gordeev , Gerald Schaefer , Heiko Carstens , Vasily Gorbik , Christian Borntraeger , Sven Schnelle , Janosch Frank , linux-s390@vger.kernel.org, linux-kernel@vger.kernel.org, kvm@vger.kernel.org Subject: Re: [PATCH] KVM: s390: Fix to clear PTE when discarding a swapped page Message-ID: <20250924143101.5c6e5f4b@p-imbrenda> In-Reply-To: References: <20250924121707.145350-1-ggala@linux.ibm.com> Organization: IBM X-Mailer: Claws Mail 4.3.1 (GTK 3.24.49; x86_64-redhat-linux-gnu) Precedence: bulk X-Mailing-List: linux-s390@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-TM-AS-GCONF: 00 X-Authority-Analysis: v=2.4 cv=J5Cq7BnS c=1 sm=1 tr=0 ts=68d3e48c cx=c_pps a=bLidbwmWQ0KltjZqbj+ezA==:117 a=bLidbwmWQ0KltjZqbj+ezA==:17 a=kj9zAlcOel0A:10 a=yJojWOMRYYMA:10 a=20KFwNOVAAAA:8 a=VnNF1IyMAAAA:8 a=wVQWkhML-FEOxgKYoe8A:9 a=CjuIK1q_8ugA:10 X-Proofpoint-GUID: 8m2-uYjM5ZVHzleGYvKfexkNL40mwDZ3 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUwOTIwMDAxNSBTYWx0ZWRfX3UkT1XWLNkoR nqtd+2SBbb7ElXYtOZwLP1+3lpqMDVjKPadKsuBlTSoKf5KPPpHemV/9SYGBt0cev7gnw0D/7z/ uL9cw7qQw0Evqj7ZzHR5nFUcU5isYDqemnLOcpUeb0UfMCPY4skrZqOicFtrjIGpF3ECczheyOx Fw2bYHopm0lgNyDK8s2w62yCbSNbU5YuNTl5hGmyhMp19AOfBeSZ3cjIuhCYespDx9X/cwME8eN +hXQgxkAnVA6XtO2IY5QhfNf827r9FY+YFbULecgxTadmLw+Zb9zZZqlRNBfXEZ2B0X1oiJUDdw /HHcOsweVoyaC16nbK4Wy1oRmlzczOkeFexjw5n+qJvpgaFAWaFBbR1+SuwqUqgZ1J1CUi/Z00N RK0rh9sK X-Proofpoint-ORIG-GUID: 8m2-uYjM5ZVHzleGYvKfexkNL40mwDZ3 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1117,Hydra:6.1.9,FMLib:17.12.80.40 definitions=2025-09-24_03,2025-09-22_05,2025-03-28_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 impostorscore=0 malwarescore=0 spamscore=0 bulkscore=0 phishscore=0 clxscore=1015 adultscore=0 suspectscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.19.0-2507300000 definitions=main-2509200015 On Wed, 24 Sep 2025 14:22:05 +0200 David Hildenbrand wrote: > On 24.09.25 14:17, Gautam Gala wrote: > > KVM run fails when guests with 'cmm' cpu feature and host are > > under memory pressure and use swap heavily. This is because > > npages becomes ENOMEN (out of memory) in hva_to_pfn_slow() > > which inturn propagates as EFAULT to qemu. Clearing the page > > table entry when discarding an address that maps to a swap > > entry resolves the issue. > > > > Suggested-by: Claudio Imbrenda > > Signed-off-by: Gautam Gala > > --- > > Sounds bad, > > I assume we want Fixes: and CC: stable, right? yes; I'll add those when picking up Reviewed-by: Claudio Imbrenda