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Subject: [PATCH v3 36/37] vfio/ap: Make vfio cdev pre-openable by passing a file handle Date: Thu, 26 Oct 2023 18:31:03 +0800 Message-Id: <20231026103104.1686921-37-zhenzhong.duan@intel.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20231026103104.1686921-1-zhenzhong.duan@intel.com> References: <20231026103104.1686921-1-zhenzhong.duan@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable 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=134.134.136.126; envelope-from=zhenzhong.duan@intel.com; helo=mgamail.intel.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 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, 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 @intel.com) X-ZM-MESSAGEID: 1698317400584100003 This gives management tools like libvirt a chance to open the vfio cdev with privilege and pass FD to qemu. This way qemu never needs to have privilege to open a VFIO or iommu cdev node. Opportunisticly, remove some unnecessory double-cast. Signed-off-by: Zhenzhong Duan Signed-off-by: C=C3=A9dric Le Goater --- hw/vfio/ap.c | 32 +++++++++++++++++++++++++++++++- 1 file changed, 31 insertions(+), 1 deletion(-) diff --git a/hw/vfio/ap.c b/hw/vfio/ap.c index 6a4186ccd3..0a810f8b88 100644 --- a/hw/vfio/ap.c +++ b/hw/vfio/ap.c @@ -29,6 +29,7 @@ #include "hw/s390x/ap-bridge.h" #include "exec/address-spaces.h" #include "qom/object.h" +#include "monitor/monitor.h" =20 #define TYPE_VFIO_AP_DEVICE "vfio-ap" =20 @@ -159,7 +160,10 @@ static void vfio_ap_realize(DeviceState *dev, Error **= errp) VFIOAPDevice *vapdev =3D VFIO_AP_DEVICE(dev); VFIODevice *vbasedev =3D &vapdev->vdev; =20 - vbasedev->name =3D g_path_get_basename(vbasedev->sysfsdev); + if (vfio_device_get_name(vbasedev, errp)) { + return; + } + vbasedev->ops =3D &vfio_ap_ops; vbasedev->type =3D VFIO_DEVICE_TYPE_AP; vbasedev->dev =3D dev; @@ -229,11 +233,36 @@ static const VMStateDescription vfio_ap_vmstate =3D { .unmigratable =3D 1, }; =20 +static void vfio_ap_instance_init(Object *obj) +{ + VFIOAPDevice *vapdev =3D VFIO_AP_DEVICE(obj); + + vapdev->vdev.fd =3D -1; +} + +#ifdef CONFIG_IOMMUFD +static void vfio_ap_set_fd(Object *obj, const char *str, Error **errp) +{ + VFIOAPDevice *vapdev =3D VFIO_AP_DEVICE(obj); + int fd =3D -1; + + fd =3D monitor_fd_param(monitor_cur(), str, errp); + if (fd =3D=3D -1) { + error_prepend(errp, "Could not parse remote object fd %s:", str); + return; + } + vapdev->vdev.fd =3D fd; +} +#endif + static void vfio_ap_class_init(ObjectClass *klass, void *data) { DeviceClass *dc =3D DEVICE_CLASS(klass); =20 device_class_set_props(dc, vfio_ap_properties); +#ifdef CONFIG_IOMMUFD + object_class_property_add_str(klass, "fd", NULL, vfio_ap_set_fd); +#endif dc->vmsd =3D &vfio_ap_vmstate; dc->desc =3D "VFIO-based AP device assignment"; set_bit(DEVICE_CATEGORY_MISC, dc->categories); @@ -248,6 +277,7 @@ static const TypeInfo vfio_ap_info =3D { .name =3D TYPE_VFIO_AP_DEVICE, .parent =3D TYPE_AP_DEVICE, .instance_size =3D sizeof(VFIOAPDevice), + .instance_init =3D vfio_ap_instance_init, .class_init =3D vfio_ap_class_init, }; =20 --=20 2.34.1