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Tsirkin" , Marcel Apfelbaum , Peter Xu , Fabiano Rosas , Steve Sistare Subject: [PATCH V6 18/21] vfio/iommufd: change process Date: Wed, 2 Jul 2025 14:58:55 -0700 Message-Id: <1751493538-202042-19-git-send-email-steven.sistare@oracle.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1751493538-202042-1-git-send-email-steven.sistare@oracle.com> References: <1751493538-202042-1-git-send-email-steven.sistare@oracle.com> X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1099,Hydra:6.1.7,FMLib:17.12.80.40 definitions=2025-07-02_04,2025-07-02_04,2025-03-28_01 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 malwarescore=0 spamscore=0 adultscore=0 mlxlogscore=999 phishscore=0 suspectscore=0 mlxscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2505160000 definitions=main-2507020182 X-Proofpoint-GUID: TTeHqp-kpreBcW3ddZ-F5GPcPqtwM_Pp X-Proofpoint-ORIG-GUID: TTeHqp-kpreBcW3ddZ-F5GPcPqtwM_Pp X-Authority-Analysis: v=2.4 cv=b82y4sGx c=1 sm=1 tr=0 ts=6865abb2 cx=c_pps a=OOZaFjgC48PWsiFpTAqLcw==:117 a=OOZaFjgC48PWsiFpTAqLcw==:17 a=Wb1JkmetP80A:10 a=yPCof4ZbAAAA:8 a=QyXUC8HyAAAA:8 a=U4C3wQu2ZDXJwwbGjwsA:9 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUwNzAyMDE4MSBTYWx0ZWRfX0IVLn7oggevE y9zBCdaUViE9cagdz2lGBtda1uWJWe4W843lpEI/v8dRWwgu9BqIr/OxCGUIKjIIdifWQxuC0YH 9jfPIDUlSsGoluCBhU45TUHFceAQqcXp6Babi8SEmw7AJEscgCD4Qq3y2UlftZTUsIH1FcDCgoB dAoOUdyUV24efWADWhefXek6lhJJkr1iRNX93rGsuOolEwq2Kw5xq06i2ogxnKUT7ml6W4lqgq6 NyBPMlaS8wcd07QgvFchWXFhYYUGOCNsNJtZm7oY6IgsQlaUcEVg1UWriMiFZBjb14iXJaiNbZ1 9V4viS8BSDiAnD+ilncK42lZgfOXhSZG2osJ375Ki7uA8lzpTzCJZSzBodXWKY7tSX83tHyYFPe fCrMhrGWZGDN0iUSxIhKsOh3oRxC3OgZ1GJxguCNkUCNS8vBxOQpXdDAoJDSpkvoJMGWijnQ Received-SPF: pass client-ip=205.220.177.32; envelope-from=steven.sistare@oracle.com; helo=mx0b-00069f02.pphosted.com X-Spam_score_int: -25 X-Spam_score: -2.6 X-Spam_bar: -- X-Spam_report: (-2.6 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_MED=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, RCVD_IN_VALIDITY_CERTIFIED_BLOCKED=0.237, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Finish CPR by change the owning process of the iommufd device in post load. Signed-off-by: Steve Sistare Reviewed-by: Zhenzhong Duan --- hw/vfio/cpr-iommufd.c | 30 ++++++++++++++++++++++++++++++ 1 file changed, 30 insertions(+) diff --git a/hw/vfio/cpr-iommufd.c b/hw/vfio/cpr-iommufd.c index a72b68d..cbeab57 100644 --- a/hw/vfio/cpr-iommufd.c +++ b/hw/vfio/cpr-iommufd.c @@ -112,10 +112,40 @@ static bool vfio_cpr_supported(IOMMUFDBackend *be, Error **errp) return true; } +static int iommufd_cpr_pre_save(void *opaque) +{ + IOMMUFDBackend *be = opaque; + + /* + * The process has not changed yet, but proactively try the ioctl, + * and it will fail if any DMA mappings are not supported. + */ + if (!iommufd_change_process_capable(be)) { + error_report("some memory regions do not support " + "IOMMU_IOAS_CHANGE_PROCESS"); + return -1; + } + return 0; +} + +static int iommufd_cpr_post_load(void *opaque, int version_id) +{ + IOMMUFDBackend *be = opaque; + Error *local_err = NULL; + + if (!iommufd_change_process(be, &local_err)) { + error_report_err(local_err); + return -1; + } + return 0; +} + static const VMStateDescription iommufd_cpr_vmstate = { .name = "iommufd", .version_id = 0, .minimum_version_id = 0, + .pre_save = iommufd_cpr_pre_save, + .post_load = iommufd_cpr_post_load, .needed = cpr_incoming_needed, .fields = (VMStateField[]) { VMSTATE_END_OF_LIST() -- 1.8.3.1