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Tsirkin" , Stefan Hajnoczi , Hanna Reitz , qemu-block@nongnu.org, "Gonglei (Arei)" , Fam Zheng , Kevin Wolf Subject: [PATCH v8 3/7] hw/virtio: derive vhost-user-rng from vhost-user-base Date: Tue, 7 Nov 2023 18:07:48 +0000 Message-Id: <20231107180752.3458672-4-alex.bennee@linaro.org> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20231107180752.3458672-1-alex.bennee@linaro.org> References: <20231107180752.3458672-1-alex.bennee@linaro.org> MIME-Version: 1.0 Received-SPF: pass client-ip=2a00:1450:4864:20::436; envelope-from=alex.bennee@linaro.org; helo=mail-wr1-x436.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+patch=linaro.org@nongnu.org Sender: qemu-devel-bounces+patch=linaro.org@nongnu.org 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 Bennée --- v5 - don't remove the in-QEMU RNG emulation! v7 - s/parent/parent_obj/ --- include/hw/virtio/vhost-user-rng.h | 13 +- hw/virtio/vhost-user-rng.c | 278 +++-------------------------- hw/virtio/meson.build | 9 +- 3 files changed, 31 insertions(+), 269 deletions(-) diff --git a/include/hw/virtio/vhost-user-rng.h b/include/hw/virtio/vhost-user-rng.h index ddd9f01eea..10868c7de4 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" #define TYPE_VHOST_USER_RNG "vhost-user-rng" OBJECT_DECLARE_SIMPLE_TYPE(VHostUserRNG, VHOST_USER_RNG) 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; }; #endif /* QEMU_VHOST_USER_RNG_H */ diff --git a/hw/virtio/vhost-user-rng.c b/hw/virtio/vhost-user-rng.c index efc54cd3fb..01879c863d 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 */ @@ -13,281 +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" -static const int feature_bits[] = { - VIRTIO_F_RING_RESET, - VHOST_INVALID_FEATURE_BIT -}; - -static void vu_rng_start(VirtIODevice *vdev) -{ - VHostUserRNG *rng = VHOST_USER_RNG(vdev); - BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vdev))); - VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus); - int ret; - int i; - - if (!k->set_guest_notifiers) { - error_report("binding does not support guest notifiers"); - return; - } - - ret = vhost_dev_enable_notifiers(&rng->vhost_dev, vdev); - if (ret < 0) { - error_report("Error enabling host notifiers: %d", -ret); - return; - } - - ret = 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 = vdev->guest_features; - ret = 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 = 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 = VHOST_USER_RNG(vdev); - BusState *qbus = BUS(qdev_get_parent_bus(DEVICE(vdev))); - VirtioBusClass *k = VIRTIO_BUS_GET_CLASS(qbus); - int ret; - - if (!k->set_guest_notifiers) { - return; - } - - vhost_dev_stop(&rng->vhost_dev, vdev, true); - - ret = k->set_guest_notifiers(qbus->parent, rng->vhost_dev.nvqs, false); - 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 = VHOST_USER_RNG(vdev); - bool should_start = virtio_device_should_start(vdev, status); - - if (vhost_dev_is_started(&rng->vhost_dev) == 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 **errp) -{ - VHostUserRNG *rng = 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 mask) -{ - VHostUserRNG *rng = VHOST_USER_RNG(vdev); - - vhost_virtqueue_mask(&rng->vhost_dev, vdev, idx, mask); -} - -static bool vu_rng_guest_notifier_pending(VirtIODevice *vdev, int idx) -{ - VHostUserRNG *rng = VHOST_USER_RNG(vdev); - - return vhost_virtqueue_pending(&rng->vhost_dev, idx); -} - -static void vu_rng_connect(DeviceState *dev) -{ - VirtIODevice *vdev = VIRTIO_DEVICE(dev); - VHostUserRNG *rng = VHOST_USER_RNG(vdev); - - if (rng->connected) { - return; - } - - rng->connected = true; - - /* restore vhost state */ - if (virtio_device_started(vdev, vdev->status)) { - vu_rng_start(vdev); - } -} - -static void vu_rng_disconnect(DeviceState *dev) -{ - VirtIODevice *vdev = VIRTIO_DEVICE(dev); - VHostUserRNG *rng = VHOST_USER_RNG(vdev); - - if (!rng->connected) { - return; - } - - rng->connected = false; - - if (vhost_dev_is_started(&rng->vhost_dev)) { - vu_rng_stop(vdev); - } -} - -static void vu_rng_event(void *opaque, QEMUChrEvent event) -{ - DeviceState *dev = 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 = VIRTIO_DEVICE(dev); - VHostUserRNG *rng = 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 = 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 = 1; - rng->vhost_dev.vqs = g_new0(struct vhost_virtqueue, rng->vhost_dev.nvqs); - ret = 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 = VIRTIO_DEVICE(dev); - VHostUserRNG *rng = VHOST_USER_RNG(dev); - struct vhost_virtqueue *vhost_vqs = 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 = VHOST_USER_RNG(vdev); - return &rng->vhost_dev; -} - static const VMStateDescription vu_rng_vmstate = { .name = "vhost-user-rng", .unmigratable = 1, }; -static Property vu_rng_properties[] = { - DEFINE_PROP_CHR("chardev", VHostUserRNG, chardev), +static Property vrng_properties[] = { + DEFINE_PROP_CHR("chardev", VHostUserBase, chardev), DEFINE_PROP_END_OF_LIST(), }; +static void vu_rng_base_realize(DeviceState *dev, Error **errp) +{ + VHostUserBase *vub = VHOST_USER_BASE(dev); + VHostUserBaseClass *vubs = VHOST_USER_BASE_GET_CLASS(dev); + + /* Fixed for RNG */ + vub->virtio_id = VIRTIO_ID_RNG; + vub->num_vqs = 1; + vub->vq_size = 4; + + vubs->parent_realize(dev, errp); +} + static void vu_rng_class_init(ObjectClass *klass, void *data) { DeviceClass *dc = DEVICE_CLASS(klass); - VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass); + VHostUserBaseClass *vubc = VHOST_USER_BASE_CLASS(klass); - device_class_set_props(dc, vu_rng_properties); dc->vmsd = &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); - vdc->realize = vu_rng_device_realize; - vdc->unrealize = vu_rng_device_unrealize; - vdc->get_features = vu_rng_get_features; - vdc->set_status = vu_rng_set_status; - vdc->guest_notifier_mask = vu_rng_guest_notifier_mask; - vdc->guest_notifier_pending = vu_rng_guest_notifier_pending; - vdc->get_vhost = vu_rng_get_vhost; + set_bit(DEVICE_CATEGORY_INPUT, dc->categories); } static const TypeInfo vu_rng_info = { .name = TYPE_VHOST_USER_RNG, - .parent = TYPE_VIRTIO_DEVICE, + .parent = TYPE_VHOST_USER_BASE, .instance_size = sizeof(VHostUserRNG), .class_init = vu_rng_class_init, }; diff --git a/hw/virtio/meson.build b/hw/virtio/meson.build index 51c3f97c2d..b5c1a461e3 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('vhost-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_RNG'], + 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', if_true: files('vhost-us specific_virtio_ss.add(when: 'CONFIG_VIRTIO_RNG', if_true: files('virtio-rng.c')) specific_virtio_ss.add(when: 'CONFIG_VIRTIO_MEM', if_true: files('virtio-mem.c')) specific_virtio_ss.add(when: 'CONFIG_VHOST_USER_I2C', if_true: files('vhost-user-i2c.c')) -specific_virtio_ss.add(when: 'CONFIG_VHOST_USER_RNG', if_true: files('vhost-user-rng.c')) specific_virtio_ss.add(when: 'CONFIG_VHOST_USER_GPIO', if_true: files('vhost-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('vhost-user-scmi.c')) @@ -49,7 +55,6 @@ virtio_pci_ss.add(when: 'CONFIG_VHOST_USER_VSOCK', if_true: files('vhost-user-vs virtio_pci_ss.add(when: 'CONFIG_VHOST_USER_BLK', if_true: files('vhost-user-blk-pci.c')) virtio_pci_ss.add(when: 'CONFIG_VHOST_USER_I2C', if_true: files('vhost-user-i2c-pci.c')) virtio_pci_ss.add(when: 'CONFIG_VHOST_USER_INPUT', if_true: files('vhost-user-input-pci.c')) -virtio_pci_ss.add(when: 'CONFIG_VHOST_USER_RNG', if_true: files('vhost-user-rng-pci.c')) virtio_pci_ss.add(when: 'CONFIG_VHOST_USER_SCSI', if_true: files('vhost-user-scsi-pci.c')) virtio_pci_ss.add(when: 'CONFIG_VHOST_SCSI', if_true: files('vhost-scsi-pci.c')) virtio_pci_ss.add(when: 'CONFIG_VHOST_USER_FS', if_true: files('vhost-user-fs-pci.c'))