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Wed, 5 Jul 2023 11:19:43 +0000 (GMT) From: Claudio Imbrenda To: kvm@vger.kernel.org Cc: linux-s390@vger.kernel.org, linux-kernel@vger.kernel.org, frankja@linux.ibm.com, mhartmay@linux.ibm.com, nsg@linux.ibm.com, borntraeger@de.ibm.com, nrb@linux.ibm.com Subject: [PATCH v2 2/2] KVM: s390: pv: fix index value of replaced ASCE Date: Wed, 5 Jul 2023 13:19:37 +0200 Message-ID: <20230705111937.33472-3-imbrenda@linux.ibm.com> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20230705111937.33472-1-imbrenda@linux.ibm.com> References: <20230705111937.33472-1-imbrenda@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-GUID: 6gHIxpc747O4KkBKipqEJmK5E5aUuUiU X-Proofpoint-ORIG-GUID: 6gHIxpc747O4KkBKipqEJmK5E5aUuUiU X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.254,Aquarius:18.0.957,Hydra:6.0.591,FMLib:17.11.176.26 definitions=2023-07-05_02,2023-07-05_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 clxscore=1015 priorityscore=1501 spamscore=0 mlxlogscore=999 adultscore=0 lowpriorityscore=0 suspectscore=0 malwarescore=0 phishscore=0 impostorscore=0 bulkscore=0 mlxscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2305260000 definitions=main-2307050097 X-Spam-Status: No, score=-2.0 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_EF,RCVD_IN_MSPIKE_H5,RCVD_IN_MSPIKE_WL, SPF_HELO_NONE,SPF_PASS,T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1770580735563552661?= X-GMAIL-MSGID: =?utf-8?q?1770580735563552661?= The index field of the struct page corresponding to a guest ASCE should be 0. When replacing the ASCE in s390_replace_asce(), the index of the new ASCE should also be set to 0. Having the wrong index might lead to the wrong addresses being passed around when notifying pte invalidations, and eventually to validity intercepts (VM crash) if the prefix gets unmapped and the notifier gets called with the wrong address. Signed-off-by: Claudio Imbrenda Reviewed-by: Philippe Mathieu-Daudé Reviewed-by: Janosch Frank --- arch/s390/mm/gmap.c | 1 + 1 file changed, 1 insertion(+) diff --git a/arch/s390/mm/gmap.c b/arch/s390/mm/gmap.c index f4b6fc746fce..7c77f246e101 100644 --- a/arch/s390/mm/gmap.c +++ b/arch/s390/mm/gmap.c @@ -2853,6 +2853,7 @@ int s390_replace_asce(struct gmap *gmap) page = alloc_pages(GFP_KERNEL_ACCOUNT, CRST_ALLOC_ORDER); if (!page) return -ENOMEM; + page->index = 0; table = page_to_virt(page); memcpy(table, gmap->table, 1UL << (CRST_ALLOC_ORDER + PAGE_SHIFT));