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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: Xe44LshYmUKywPnW380scENctovyLsiy X-Proofpoint-GUID: Tqp3ZGkPe0sOldXA-XaE3xEmJnIs0V6l X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1057,Hydra:6.0.680,FMLib:17.12.68.34 definitions=2025-01-17_06,2025-01-16_01,2024-11-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 adultscore=0 mlxlogscore=828 priorityscore=1501 malwarescore=0 mlxscore=0 suspectscore=0 bulkscore=0 spamscore=0 impostorscore=0 clxscore=1015 phishscore=0 lowpriorityscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2411120000 definitions=main-2501170130 On 1/16/25 12:33 PM, Claudio Imbrenda wrote: > Move some gmap shadowing functions from mm/gmap.c to kvm/kvm-s390.c and > the newly created kvm/gmap-vsie.c > > This is a step toward removing gmap from mm. > > Signed-off-by: Claudio Imbrenda [...] > -/** > - * gmap_mprotect_notify - change access rights for a range of ptes and > - * call the notifier if any pte changes again > - * @gmap: pointer to guest mapping meta data structure > - * @gaddr: virtual address in the guest address space > - * @len: size of area > - * @prot: indicates access rights: PROT_NONE, PROT_READ or PROT_WRITE > - * > - * Returns 0 if for each page in the given range a gmap mapping exists, > - * the new access rights could be set and the notifier could be armed. > - * If the gmap mapping is missing for one or more pages -EFAULT is > - * returned. If no memory could be allocated -ENOMEM is returned. > - * This function establishes missing page table entries. > - */ > -int gmap_mprotect_notify(struct gmap *gmap, unsigned long gaddr, > - unsigned long len, int prot) > -{ > - int rc; > + if (!pmd_leaf(*pmdp)) { > + rc = gmap_protect_pte(gmap, gaddr, pmdp, prot, bits); > + } else { > + rc = gmap_protect_pmd(gmap, gaddr, pmdp, prot, bits); > + if (!rc) > + rc = 1; Instead of doing this, could you return PAGE_SIZE or HPAGE_SIZE if !rc? That would also get rid of the ternary in the ALIGN() in __kvm_s390_mprotect_many() which is also a thorn in my side.