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Tsirkin" , Raphael Norwitz , Paolo Bonzini , Viresh Kumar , Stefan Hajnoczi Subject: [PATCH v9 03/11] hw/virtio: derive vhost-user-rng from vhost-user-base Date: Thu, 4 Jan 2024 21:09:37 +0000 Message-Id: <20240104210945.1223134-4-alex.bennee@linaro.org> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20240104210945.1223134-1-alex.bennee@linaro.org> References: <20240104210945.1223134-1-alex.bennee@linaro.org> 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=2a00:1450:4864:20::42b; envelope-from=alex.bennee@linaro.org; helo=mail-wr1-x42b.google.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, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 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 @linaro.org) X-ZM-MESSAGEID: 1704402731963100001 Now we can take advantage of our new base class and make vhost-user-rng a much simpler boilerplate wrapper. Also as this doesn't require any target specific hacks we only need to build the stubs once. Acked-by: Mark Cave-Ayland Signed-off-by: Alex Benn=C3=A9e --- v5 - don't remove the in-QEMU RNG emulation! v7 - s/parent/parent_obj/ v8 - fix merge conflict (idx =3D=3D VIRTIO_CONFIG_IRQ_IDX not needed as base doesn't use notifiers) --- include/hw/virtio/vhost-user-rng.h | 13 +- hw/virtio/vhost-user-rng.c | 294 +++-------------------------- hw/virtio/meson.build | 9 +- 3 files changed, 31 insertions(+), 285 deletions(-) diff --git a/include/hw/virtio/vhost-user-rng.h b/include/hw/virtio/vhost-u= ser-rng.h index ddd9f01eea6..10868c7de4d 100644 --- a/include/hw/virtio/vhost-user-rng.h +++ b/include/hw/virtio/vhost-user-rng.h @@ -12,22 +12,13 @@ #include "hw/virtio/virtio.h" #include "hw/virtio/vhost.h" #include "hw/virtio/vhost-user.h" -#include "chardev/char-fe.h" +#include "hw/virtio/vhost-user-base.h" =20 #define TYPE_VHOST_USER_RNG "vhost-user-rng" OBJECT_DECLARE_SIMPLE_TYPE(VHostUserRNG, VHOST_USER_RNG) =20 struct VHostUserRNG { - /*< private >*/ - VirtIODevice parent; - CharBackend chardev; - struct vhost_virtqueue *vhost_vq; - struct vhost_dev vhost_dev; - VhostUserState vhost_user; - VirtQueue *req_vq; - bool connected; - - /*< public >*/ + VHostUserBase parent_obj; }; =20 #endif /* QEMU_VHOST_USER_RNG_H */ diff --git a/hw/virtio/vhost-user-rng.c b/hw/virtio/vhost-user-rng.c index 24ac1a22c83..01879c863df 100644 --- a/hw/virtio/vhost-user-rng.c +++ b/hw/virtio/vhost-user-rng.c @@ -3,7 +3,7 @@ * * Copyright (c) 2021 Mathieu Poirier * - * Implementation seriously tailored on vhost-user-i2c.c + * Simple wrapper of the generic vhost-user-device. * * SPDX-License-Identifier: GPL-2.0-or-later */ @@ -13,297 +13,47 @@ #include "hw/qdev-properties.h" #include "hw/virtio/virtio-bus.h" #include "hw/virtio/vhost-user-rng.h" -#include "qemu/error-report.h" #include "standard-headers/linux/virtio_ids.h" =20 -static const int feature_bits[] =3D { - VIRTIO_F_RING_RESET, - VHOST_INVALID_FEATURE_BIT -}; - -static void vu_rng_start(VirtIODevice *vdev) -{ - VHostUserRNG *rng =3D VHOST_USER_RNG(vdev); - BusState *qbus =3D BUS(qdev_get_parent_bus(DEVICE(vdev))); - VirtioBusClass *k =3D VIRTIO_BUS_GET_CLASS(qbus); - int ret; - int i; - - if (!k->set_guest_notifiers) { - error_report("binding does not support guest notifiers"); - return; - } - - ret =3D vhost_dev_enable_notifiers(&rng->vhost_dev, vdev); - if (ret < 0) { - error_report("Error enabling host notifiers: %d", -ret); - return; - } - - ret =3D k->set_guest_notifiers(qbus->parent, rng->vhost_dev.nvqs, true= ); - if (ret < 0) { - error_report("Error binding guest notifier: %d", -ret); - goto err_host_notifiers; - } - - rng->vhost_dev.acked_features =3D vdev->guest_features; - ret =3D vhost_dev_start(&rng->vhost_dev, vdev, true); - if (ret < 0) { - error_report("Error starting vhost-user-rng: %d", -ret); - goto err_guest_notifiers; - } - - /* - * guest_notifier_mask/pending not used yet, so just unmask - * everything here. virtio-pci will do the right thing by - * enabling/disabling irqfd. - */ - for (i =3D 0; i < rng->vhost_dev.nvqs; i++) { - vhost_virtqueue_mask(&rng->vhost_dev, vdev, i, false); - } - - return; - -err_guest_notifiers: - k->set_guest_notifiers(qbus->parent, rng->vhost_dev.nvqs, false); -err_host_notifiers: - vhost_dev_disable_notifiers(&rng->vhost_dev, vdev); -} - -static void vu_rng_stop(VirtIODevice *vdev) -{ - VHostUserRNG *rng =3D VHOST_USER_RNG(vdev); - BusState *qbus =3D BUS(qdev_get_parent_bus(DEVICE(vdev))); - VirtioBusClass *k =3D VIRTIO_BUS_GET_CLASS(qbus); - int ret; - - if (!k->set_guest_notifiers) { - return; - } - - vhost_dev_stop(&rng->vhost_dev, vdev, true); - - ret =3D k->set_guest_notifiers(qbus->parent, rng->vhost_dev.nvqs, fals= e); - if (ret < 0) { - error_report("vhost guest notifier cleanup failed: %d", ret); - return; - } - - vhost_dev_disable_notifiers(&rng->vhost_dev, vdev); -} - -static void vu_rng_set_status(VirtIODevice *vdev, uint8_t status) -{ - VHostUserRNG *rng =3D VHOST_USER_RNG(vdev); - bool should_start =3D virtio_device_should_start(vdev, status); - - if (vhost_dev_is_started(&rng->vhost_dev) =3D=3D should_start) { - return; - } - - if (should_start) { - vu_rng_start(vdev); - } else { - vu_rng_stop(vdev); - } -} - -static uint64_t vu_rng_get_features(VirtIODevice *vdev, - uint64_t requested_features, Error **e= rrp) -{ - VHostUserRNG *rng =3D VHOST_USER_RNG(vdev); - - return vhost_get_features(&rng->vhost_dev, feature_bits, - requested_features); -} - -static void vu_rng_handle_output(VirtIODevice *vdev, VirtQueue *vq) -{ - /* - * Not normally called; it's the daemon that handles the queue; - * however virtio's cleanup path can call this. - */ -} - -static void vu_rng_guest_notifier_mask(VirtIODevice *vdev, int idx, bool m= ask) -{ - VHostUserRNG *rng =3D VHOST_USER_RNG(vdev); - - /* - * We don't support interrupts, return early if index is set to - * VIRTIO_CONFIG_IRQ_IDX. - */ - if (idx =3D=3D VIRTIO_CONFIG_IRQ_IDX) { - return; - } - - vhost_virtqueue_mask(&rng->vhost_dev, vdev, idx, mask); -} - -static bool vu_rng_guest_notifier_pending(VirtIODevice *vdev, int idx) -{ - VHostUserRNG *rng =3D VHOST_USER_RNG(vdev); - - /* - * We don't support interrupts, return early if index is set to - * VIRTIO_CONFIG_IRQ_IDX. - */ - if (idx =3D=3D VIRTIO_CONFIG_IRQ_IDX) { - return false; - } - - return vhost_virtqueue_pending(&rng->vhost_dev, idx); -} - -static void vu_rng_connect(DeviceState *dev) -{ - VirtIODevice *vdev =3D VIRTIO_DEVICE(dev); - VHostUserRNG *rng =3D VHOST_USER_RNG(vdev); - - if (rng->connected) { - return; - } - - rng->connected =3D true; - - /* restore vhost state */ - if (virtio_device_started(vdev, vdev->status)) { - vu_rng_start(vdev); - } -} - -static void vu_rng_disconnect(DeviceState *dev) -{ - VirtIODevice *vdev =3D VIRTIO_DEVICE(dev); - VHostUserRNG *rng =3D VHOST_USER_RNG(vdev); - - if (!rng->connected) { - return; - } - - rng->connected =3D false; - - if (vhost_dev_is_started(&rng->vhost_dev)) { - vu_rng_stop(vdev); - } -} - -static void vu_rng_event(void *opaque, QEMUChrEvent event) -{ - DeviceState *dev =3D opaque; - - switch (event) { - case CHR_EVENT_OPENED: - vu_rng_connect(dev); - break; - case CHR_EVENT_CLOSED: - vu_rng_disconnect(dev); - break; - case CHR_EVENT_BREAK: - case CHR_EVENT_MUX_IN: - case CHR_EVENT_MUX_OUT: - /* Ignore */ - break; - } -} - -static void vu_rng_device_realize(DeviceState *dev, Error **errp) -{ - VirtIODevice *vdev =3D VIRTIO_DEVICE(dev); - VHostUserRNG *rng =3D VHOST_USER_RNG(dev); - int ret; - - if (!rng->chardev.chr) { - error_setg(errp, "missing chardev"); - return; - } - - if (!vhost_user_init(&rng->vhost_user, &rng->chardev, errp)) { - return; - } - - virtio_init(vdev, VIRTIO_ID_RNG, 0); - - rng->req_vq =3D virtio_add_queue(vdev, 4, vu_rng_handle_output); - if (!rng->req_vq) { - error_setg_errno(errp, -1, "virtio_add_queue() failed"); - goto virtio_add_queue_failed; - } - - rng->vhost_dev.nvqs =3D 1; - rng->vhost_dev.vqs =3D g_new0(struct vhost_virtqueue, rng->vhost_dev.n= vqs); - ret =3D vhost_dev_init(&rng->vhost_dev, &rng->vhost_user, - VHOST_BACKEND_TYPE_USER, 0, errp); - if (ret < 0) { - error_setg_errno(errp, -ret, "vhost_dev_init() failed"); - goto vhost_dev_init_failed; - } - - qemu_chr_fe_set_handlers(&rng->chardev, NULL, NULL, vu_rng_event, NULL, - dev, NULL, true); - - return; - -vhost_dev_init_failed: - g_free(rng->vhost_dev.vqs); - virtio_delete_queue(rng->req_vq); -virtio_add_queue_failed: - virtio_cleanup(vdev); - vhost_user_cleanup(&rng->vhost_user); -} - -static void vu_rng_device_unrealize(DeviceState *dev) -{ - VirtIODevice *vdev =3D VIRTIO_DEVICE(dev); - VHostUserRNG *rng =3D VHOST_USER_RNG(dev); - struct vhost_virtqueue *vhost_vqs =3D rng->vhost_dev.vqs; - - vu_rng_set_status(vdev, 0); - - vhost_dev_cleanup(&rng->vhost_dev); - g_free(vhost_vqs); - virtio_delete_queue(rng->req_vq); - virtio_cleanup(vdev); - vhost_user_cleanup(&rng->vhost_user); -} - -static struct vhost_dev *vu_rng_get_vhost(VirtIODevice *vdev) -{ - VHostUserRNG *rng =3D VHOST_USER_RNG(vdev); - return &rng->vhost_dev; -} - static const VMStateDescription vu_rng_vmstate =3D { .name =3D "vhost-user-rng", .unmigratable =3D 1, }; =20 -static Property vu_rng_properties[] =3D { - DEFINE_PROP_CHR("chardev", VHostUserRNG, chardev), +static Property vrng_properties[] =3D { + DEFINE_PROP_CHR("chardev", VHostUserBase, chardev), DEFINE_PROP_END_OF_LIST(), }; =20 +static void vu_rng_base_realize(DeviceState *dev, Error **errp) +{ + VHostUserBase *vub =3D VHOST_USER_BASE(dev); + VHostUserBaseClass *vubs =3D VHOST_USER_BASE_GET_CLASS(dev); + + /* Fixed for RNG */ + vub->virtio_id =3D VIRTIO_ID_RNG; + vub->num_vqs =3D 1; + vub->vq_size =3D 4; + + vubs->parent_realize(dev, errp); +} + static void vu_rng_class_init(ObjectClass *klass, void *data) { DeviceClass *dc =3D DEVICE_CLASS(klass); - VirtioDeviceClass *vdc =3D VIRTIO_DEVICE_CLASS(klass); + VHostUserBaseClass *vubc =3D VHOST_USER_BASE_CLASS(klass); =20 - device_class_set_props(dc, vu_rng_properties); dc->vmsd =3D &vu_rng_vmstate; - set_bit(DEVICE_CATEGORY_INPUT, dc->categories); + device_class_set_props(dc, vrng_properties); + device_class_set_parent_realize(dc, vu_rng_base_realize, + &vubc->parent_realize); =20 - vdc->realize =3D vu_rng_device_realize; - vdc->unrealize =3D vu_rng_device_unrealize; - vdc->get_features =3D vu_rng_get_features; - vdc->set_status =3D vu_rng_set_status; - vdc->guest_notifier_mask =3D vu_rng_guest_notifier_mask; - vdc->guest_notifier_pending =3D vu_rng_guest_notifier_pending; - vdc->get_vhost =3D vu_rng_get_vhost; + set_bit(DEVICE_CATEGORY_INPUT, dc->categories); } =20 static const TypeInfo vu_rng_info =3D { .name =3D TYPE_VHOST_USER_RNG, - .parent =3D TYPE_VIRTIO_DEVICE, + .parent =3D TYPE_VHOST_USER_BASE, .instance_size =3D sizeof(VHostUserRNG), .class_init =3D vu_rng_class_init, }; diff --git a/hw/virtio/meson.build b/hw/virtio/meson.build index 51c3f97c2d0..b5c1a461e34 100644 --- a/hw/virtio/meson.build +++ b/hw/virtio/meson.build @@ -18,8 +18,15 @@ if have_vhost # fixme - this really should be generic specific_virtio_ss.add(files('vhost-user.c')) system_virtio_ss.add(files('vhost-user-base.c')) + + # MMIO Stubs system_virtio_ss.add(files('vhost-user-device.c')) + system_virtio_ss.add(when: 'CONFIG_VHOST_USER_RNG', if_true: files('vh= ost-user-rng.c')) + + # PCI Stubs system_virtio_ss.add(when: 'CONFIG_VIRTIO_PCI', if_true: files('vhost-= user-device-pci.c')) + system_virtio_ss.add(when: ['CONFIG_VIRTIO_PCI', 'CONFIG_VHOST_USER_RN= G'], + if_true: files('vhost-user-rng-pci.c')) endif if have_vhost_vdpa system_virtio_ss.add(files('vhost-vdpa.c')) @@ -37,7 +44,6 @@ specific_virtio_ss.add(when: 'CONFIG_VHOST_USER_VSOCK', i= f_true: files('vhost-us specific_virtio_ss.add(when: 'CONFIG_VIRTIO_RNG', if_true: files('virtio-r= ng.c')) specific_virtio_ss.add(when: 'CONFIG_VIRTIO_MEM', if_true: files('virtio-m= em.c')) specific_virtio_ss.add(when: 'CONFIG_VHOST_USER_I2C', if_true: files('vhos= t-user-i2c.c')) -specific_virtio_ss.add(when: 'CONFIG_VHOST_USER_RNG', if_true: files('vhos= t-user-rng.c')) specific_virtio_ss.add(when: 'CONFIG_VHOST_USER_GPIO', if_true: files('vho= st-user-gpio.c')) specific_virtio_ss.add(when: ['CONFIG_VIRTIO_PCI', 'CONFIG_VHOST_USER_GPIO= '], if_true: files('vhost-user-gpio-pci.c')) specific_virtio_ss.add(when: 'CONFIG_VHOST_USER_SCMI', if_true: files('vho= st-user-scmi.c')) @@ -49,7 +55,6 @@ virtio_pci_ss.add(when: 'CONFIG_VHOST_USER_VSOCK', if_tru= e: files('vhost-user-vs virtio_pci_ss.add(when: 'CONFIG_VHOST_USER_BLK', if_true: files('vhost-use= r-blk-pci.c')) virtio_pci_ss.add(when: 'CONFIG_VHOST_USER_I2C', if_true: files('vhost-use= r-i2c-pci.c')) virtio_pci_ss.add(when: 'CONFIG_VHOST_USER_INPUT', if_true: files('vhost-u= ser-input-pci.c')) -virtio_pci_ss.add(when: 'CONFIG_VHOST_USER_RNG', if_true: files('vhost-use= r-rng-pci.c')) virtio_pci_ss.add(when: 'CONFIG_VHOST_USER_SCSI', if_true: files('vhost-us= er-scsi-pci.c')) virtio_pci_ss.add(when: 'CONFIG_VHOST_SCSI', if_true: files('vhost-scsi-pc= i.c')) virtio_pci_ss.add(when: 'CONFIG_VHOST_USER_FS', if_true: files('vhost-user= -fs-pci.c')) --=20 2.39.2