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Tsirkin" , Marcel Apfelbaum , Peter Xu , Fabiano Rosas , Steve Sistare Subject: [PATCH V6 06/21] backends/iommufd: change process ioctl Date: Wed, 2 Jul 2025 14:58:43 -0700 Message-Id: <1751493538-202042-7-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> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 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-Spam-Details-Enc: AW1haW4tMjUwNzAyMDE4MiBTYWx0ZWRfX8cXd7tmNrAhW wyUvRPyrB0MPFB7hQ9P0kjmBHcEaJptT/5gkvjL21IZY2rtD3qMdB7Yc5JDm1XS3KwJBP1S78Hc ecvgVauFuOLu1hLdnfu9ZpsR4b0fPBJhNqHk03XazQkO16yoGmDtxnCXTla2Ys04zSjOPhC7G7k XX24YtLlFULMkYdL8IlbF2142qreZkHDCozr7pyLepf3IQ3IV9iCy9F6X/F6VlfjI7A5A9/AL5B 0Rv5xoEnd7mFXhMJxWBGixqUUtbyGzHECoPc5WBsEWaOUYbzlnkj3hacW4LuNT8XpQVAheCirKG KiCVZWFKcxJyXOzMbAKPgwk6Ur93sa7DZJHMMQrUrVWZ/YzVyfbyucVg8Z/nRVDzSJ9QlayEuNd tYTAJ+ohJym96dT1aED/xyt27eO7SFLkV06k4I0z7Js904Kos4QptErJuDdmmuStd5Vt4g9O X-Proofpoint-ORIG-GUID: jO_WGt1Ti3Jgf6BkzY_XUjaMju_pHgfQ X-Proofpoint-GUID: jO_WGt1Ti3Jgf6BkzY_XUjaMju_pHgfQ X-Authority-Analysis: v=2.4 cv=QfRmvtbv c=1 sm=1 tr=0 ts=6865aba9 cx=c_pps a=OOZaFjgC48PWsiFpTAqLcw==:117 a=OOZaFjgC48PWsiFpTAqLcw==:17 a=IkcTkHD0fZMA:10 a=Wb1JkmetP80A:10 a=yPCof4ZbAAAA:8 a=20KFwNOVAAAA:8 a=QyXUC8HyAAAA:8 a=SRdfyBftnUHxAk-46XYA:9 a=3ZKOabzyN94A:10 a=QEXdDO2ut3YA:10 Received-SPF: pass client-ip=205.220.165.32; envelope-from=steven.sistare@oracle.com; helo=mx0a-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_H5=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 Define the change process ioctl Signed-off-by: Steve Sistare Reviewed-by: Cédric Le Goater Reviewed-by: Zhenzhong Duan --- include/system/iommufd.h | 3 +++ backends/iommufd.c | 24 ++++++++++++++++++++++++ backends/trace-events | 1 + 3 files changed, 28 insertions(+) diff --git a/include/system/iommufd.h b/include/system/iommufd.h index 2d24d93..db5f2c7 100644 --- a/include/system/iommufd.h +++ b/include/system/iommufd.h @@ -69,6 +69,9 @@ bool iommufd_backend_invalidate_cache(IOMMUFDBackend *be, uint32_t id, uint32_t *entry_num, void *data, Error **errp); +bool iommufd_change_process_capable(IOMMUFDBackend *be); +bool iommufd_change_process(IOMMUFDBackend *be, Error **errp); + #define TYPE_HOST_IOMMU_DEVICE_IOMMUFD TYPE_HOST_IOMMU_DEVICE "-iommufd" OBJECT_DECLARE_TYPE(HostIOMMUDeviceIOMMUFD, HostIOMMUDeviceIOMMUFDClass, HOST_IOMMU_DEVICE_IOMMUFD) diff --git a/backends/iommufd.c b/backends/iommufd.c index 3a2ecc7..87f81a0 100644 --- a/backends/iommufd.c +++ b/backends/iommufd.c @@ -73,6 +73,30 @@ static void iommufd_backend_class_init(ObjectClass *oc, const void *data) object_class_property_add_str(oc, "fd", NULL, iommufd_backend_set_fd); } +bool iommufd_change_process_capable(IOMMUFDBackend *be) +{ + struct iommu_ioas_change_process args = {.size = sizeof(args)}; + + /* + * Call IOMMU_IOAS_CHANGE_PROCESS to verify it is a recognized ioctl. + * This is a no-op if the process has not changed since DMA was mapped. + */ + return !ioctl(be->fd, IOMMU_IOAS_CHANGE_PROCESS, &args); +} + +bool iommufd_change_process(IOMMUFDBackend *be, Error **errp) +{ + struct iommu_ioas_change_process args = {.size = sizeof(args)}; + bool ret = !ioctl(be->fd, IOMMU_IOAS_CHANGE_PROCESS, &args); + + if (!ret) { + error_setg_errno(errp, errno, "IOMMU_IOAS_CHANGE_PROCESS fd %d failed", + be->fd); + } + trace_iommufd_change_process(be->fd, ret); + return ret; +} + bool iommufd_backend_connect(IOMMUFDBackend *be, Error **errp) { int fd; diff --git a/backends/trace-events b/backends/trace-events index e5f3e70..56132d3 100644 --- a/backends/trace-events +++ b/backends/trace-events @@ -7,6 +7,7 @@ dbus_vmstate_loading(const char *id) "id: %s" dbus_vmstate_saving(const char *id) "id: %s" # iommufd.c +iommufd_change_process(int fd, bool ret) "fd=%d (%d)" iommufd_backend_connect(int fd, bool owned, uint32_t users) "fd=%d owned=%d users=%d" iommufd_backend_disconnect(int fd, uint32_t users) "fd=%d users=%d" iommu_backend_set_fd(int fd) "pre-opened /dev/iommu fd=%d" -- 1.8.3.1