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c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1751618770; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=u7HynSMK05b6lBlM28Uo8t4bq96JVAh38/zQHg3D6aM=; b=cehiYIAD/u2v4Cec4A6k43hbjtGwwyR/tKvQxJzEedUMKh0ZBJ3oV9WDF042AeHuziwHy3 QGw2Bl300SF+d0gjtUu1XS3Xdtd+/KexHvGfodErVghftpW8PTT7putl5V24vpLvSkEkO+ DH6pgagjyEU58KLJPuV4TyxGMvThL90= X-MC-Unique: WjtOCcv8OyS-Jp8NqkQkQg-1 X-Mimecast-MFC-AGG-ID: WjtOCcv8OyS-Jp8NqkQkQg_1751618765 From: =?UTF-8?q?C=C3=A9dric=20Le=20Goater?= To: qemu-devel@nongnu.org Cc: Alex Williamson , Steve Sistare , =?UTF-8?q?C=C3=A9dric=20Le=20Goater?= , Zhenzhong Duan Subject: [PULL 12/27] backends/iommufd: change process ioctl Date: Fri, 4 Jul 2025 10:45:13 +0200 Message-ID: <20250704084528.1412959-13-clg@redhat.com> In-Reply-To: <20250704084528.1412959-1-clg@redhat.com> References: <20250704084528.1412959-1-clg@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.0 on 10.30.177.12 Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=170.10.133.124; envelope-from=clg@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -18 X-Spam_score: -1.9 X-Spam_bar: - X-Spam_report: (-1.9 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, 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+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1751619088317116600 From: Steve Sistare Define the change process ioctl Signed-off-by: Steve Sistare Reviewed-by: C=C3=A9dric Le Goater Reviewed-by: Zhenzhong Duan Link: https://lore.kernel.org/qemu-devel/1751493538-202042-7-git-send-email= -steven.sistare@oracle.com Signed-off-by: C=C3=A9dric Le Goater --- 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 2d24d93d17e280bce53030a52588bd91425e03ea..db5f2c716c5be6cd1313045ab6d= d28eb1f8356f3 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); =20 +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 3a2ecc7f5ba67699249ae1ad632fc8a45e9b53d3..87f81a05f6465cabc5673745f95= 947db2bb4a4fb 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); } =20 +bool iommufd_change_process_capable(IOMMUFDBackend *be) +{ + struct iommu_ioas_change_process args =3D {.size =3D 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 =3D {.size =3D sizeof(args)}; + bool ret =3D !ioctl(be->fd, IOMMU_IOAS_CHANGE_PROCESS, &args); + + if (!ret) { + error_setg_errno(errp, errno, "IOMMU_IOAS_CHANGE_PROCESS fd %d fai= led", + 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 e5f3e70cd1ba7eb532c8f763b12460ef8f552245..56132d3fd22b5a217b07349c74f= 17e50d553a799 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" =20 # iommufd.c +iommufd_change_process(int fd, bool ret) "fd=3D%d (%d)" iommufd_backend_connect(int fd, bool owned, uint32_t users) "fd=3D%d owned= =3D%d users=3D%d" iommufd_backend_disconnect(int fd, uint32_t users) "fd=3D%d users=3D%d" iommu_backend_set_fd(int fd) "pre-opened /dev/iommu fd=3D%d" --=20 2.50.0