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charset="utf-8" This commit implements suspend and resume facility of virtio data-plane according to the new spec changes, and a reference design on virtio-net. Signed-off-by: Zhu Lingshan --- hw/net/virtio-net.c | 115 ++++++++++++++++++ hw/virtio/virtio.c | 8 ++ .../standard-headers/linux/virtio_config.h | 6 + 3 files changed, 129 insertions(+) diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c index 6b5b5dace3..5989349d2b 100644 --- a/hw/net/virtio-net.c +++ b/hw/net/virtio-net.c @@ -382,6 +382,109 @@ static void virtio_net_drop_tx_queue_data(VirtIODevic= e *vdev, VirtQueue *vq) } } =20 +static void virtio_net_suspend_dataplane(VirtIONet *n) +{ + VirtIODevice *vdev =3D VIRTIO_DEVICE(n); + VirtIONetQueue *q; + NetClientState *nc; + int queue_pairs, cvq, i; + + // suspend vhost + if (n->vhost_started) { + queue_pairs =3D n->multiqueue ? n->max_queue_pairs : 1; + cvq =3D virtio_vdev_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ) ? + n->max_ncs - n->max_queue_pairs : 0; + + vhost_net_stop(vdev, n->nic->ncs, queue_pairs, cvq); + n->vhost_started =3D 0; + } + + // suspend qemu emulated queues + for (i =3D 0; i < n->max_queue_pairs; i++) { + q =3D &n->vqs[i]; + nc =3D qemu_get_subqueue(n->nic, i); + + // disable qeueu notifications + //virtio_queue_set_notification(q->rx_vq, 0); + virtio_queue_set_notification(q->tx_vq, 0); + + // disable timer and BH + if (q->tx_timer) { + timer_del(q->tx_timer); + } else { + qemu_bh_cancel(q->tx_bh); + } + q->tx_waiting =3D 0; + + // clean queues + qemu_purge_queued_packets(nc); + + // clean async transitions + if (q->async_tx.elem) { + virtqueue_push(q->tx_vq, q->async_tx.elem, 0); + virtio_notify(vdev, q->tx_vq); + g_free(q->async_tx.elem); + q->async_tx.elem =3D NULL; + } + } +} + +static int virtio_net_resume_dataplane(VirtIONet *n) +{ + VirtIODevice *vdev =3D VIRTIO_DEVICE(n); + NetClientState *nc =3D qemu_get_queue(n->nic); + VirtIONetQueue *q; + NetClientState *qnc; + int queue_pairs, cvq, i, r; + + if (!(vdev->status & VIRTIO_CONFIG_S_SUSPEND)) + return -1; + + // resume vhost + if (get_vhost_net(nc->peer)) { + queue_pairs =3D n->multiqueue ? n->max_queue_pairs : 1; + cvq =3D virtio_vdev_has_feature(vdev, VIRTIO_NET_F_CTRL_VQ) ? + n->max_ncs - n->max_queue_pairs : 0; + r =3D vhost_net_start(vdev, n->nic->ncs, queue_pairs, cvq); + if (r < 0) { + error_report("unable to start vhost net: %d", r); + n->vhost_started =3D 1; + + return -1; + } + + n->vhost_started =3D 1; + + for (i =3D 0; i < queue_pairs; i++) { + qnc =3D qemu_get_subqueue(n->nic, i); + + /* Purge both directions: TX and RX. */ + qemu_net_queue_purge(qnc->peer->incoming_queue, qnc); + qemu_net_queue_purge(qnc->incoming_queue, qnc->peer); + } + } + + // resume qemu emulated queues + if (!n->vhost_started) { + for (i =3D 0; i < n->max_queue_pairs; i++) { + q =3D &n->vqs[i]; + nc =3D qemu_get_subqueue(n->nic, i); + + if (q->tx_timer) { + timer_mod(q->tx_timer, + qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL) + n->tx_ti= meout); + } else { + replay_bh_schedule_event(q->tx_bh); + virtio_queue_set_notification(q->tx_vq, 1); + } + // flush packets + qemu_flush_queued_packets(nc); + } + } + + return 0; +} + static int virtio_net_set_status(struct VirtIODevice *vdev, uint8_t status) { VirtIONet *n =3D VIRTIO_NET(vdev); @@ -389,6 +492,18 @@ static int virtio_net_set_status(struct VirtIODevice *= vdev, uint8_t status) int i; uint8_t queue_status; =20 + if ((vdev->status & VIRTIO_CONFIG_S_DRIVER_OK) && + (status & VIRTIO_CONFIG_S_SUSPEND) && + (virtio_vdev_has_feature(vdev, VIRTIO_F_SUSPEND))) { + virtio_net_suspend_dataplane(n); + } + + if ((!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK)) && + (vdev->status & VIRTIO_CONFIG_S_SUSPEND) && + (status & VIRTIO_CONFIG_S_DRIVER_OK)) { + virtio_net_resume_dataplane(n); + } + virtio_net_vnet_endian_status(n, status); virtio_net_vhost_status(n, status); =20 diff --git a/hw/virtio/virtio.c b/hw/virtio/virtio.c index 9a81ad912e..e5abbc4601 100644 --- a/hw/virtio/virtio.c +++ b/hw/virtio/virtio.c @@ -2268,6 +2268,14 @@ int virtio_set_status(VirtIODevice *vdev, uint8_t va= l) } vdev->status =3D val; =20 + /* The driver suspends the device */ + if (virtio_vdev_has_feature(vdev, VIRTIO_F_SUSPEND) && + (vdev->status & VIRTIO_CONFIG_S_DRIVER_OK) && + (val & VIRTIO_CONFIG_S_SUSPEND) && !ret) { + virtio_set_started(vdev, false); + vdev->status &=3D !VIRTIO_CONFIG_S_DRIVER_OK; + } + return ret; } =20 diff --git a/include/standard-headers/linux/virtio_config.h b/include/stand= ard-headers/linux/virtio_config.h index 45be0fa1bc..ba380f2b52 100644 --- a/include/standard-headers/linux/virtio_config.h +++ b/include/standard-headers/linux/virtio_config.h @@ -40,6 +40,8 @@ #define VIRTIO_CONFIG_S_DRIVER_OK 4 /* Driver has finished configuring features */ #define VIRTIO_CONFIG_S_FEATURES_OK 8 +/* Driver has suspended the device. */ +#define VIRTIO_CONFIG_S_SUSPEND 16 /* Device entered invalid state, driver must reset it */ #define VIRTIO_CONFIG_S_NEEDS_RESET 0x40 /* We've given up on this device. */ @@ -117,5 +119,9 @@ * This feature indicates that the device support administration virtqueue= s. */ #define VIRTIO_F_ADMIN_VQ 41 +/* + * This feature indicates that the driver can suspend the device + */ +#define VIRTIO_F_SUSPEND 43 =20 #endif /* _LINUX_VIRTIO_CONFIG_H */ --=20 2.51.0 From nobody Sun Sep 28 17:07:16 2025 Delivered-To: importer@patchew.org Authentication-Results: mx.zohomail.com; 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charset="utf-8" This commit implements suspend and resume facility of virtio control-plane according to the new spec changes, and a reference design on virtio-net. Signed-off-by: Zhu Lingshan --- hw/virtio/virtio-pci.c | 5 +++++ hw/virtio/virtio.c | 16 ++++++++++++++++ include/hw/virtio/virtio.h | 1 + 3 files changed, 22 insertions(+) diff --git a/hw/virtio/virtio-pci.c b/hw/virtio/virtio-pci.c index 767216d795..bc9189746f 100644 --- a/hw/virtio/virtio-pci.c +++ b/hw/virtio/virtio-pci.c @@ -1580,6 +1580,11 @@ static void virtio_pci_common_write(void *opaque, hw= addr addr, return; } =20 + /* only allow writing device status while suspended */ + if ((vdev->status & VIRTIO_CONFIG_S_SUSPEND) && (addr !=3D VIRTIO_PCI_= COMMON_STATUS)) { + return; + } + switch (addr) { case VIRTIO_PCI_COMMON_DFSELECT: proxy->dfselect =3D val; diff --git a/hw/virtio/virtio.c b/hw/virtio/virtio.c index e5abbc4601..9d632d72be 100644 --- a/hw/virtio/virtio.c +++ b/hw/virtio/virtio.c @@ -2242,8 +2242,10 @@ int virtio_set_status(VirtIODevice *vdev, uint8_t va= l) { VirtioDeviceClass *k =3D VIRTIO_DEVICE_GET_CLASS(vdev); trace_virtio_set_status(vdev, val); + uint8_t old_status; int ret =3D 0; =20 + old_status =3D vdev->status; if (virtio_vdev_has_feature(vdev, VIRTIO_F_VERSION_1)) { if (!(vdev->status & VIRTIO_CONFIG_S_FEATURES_OK) && val & VIRTIO_CONFIG_S_FEATURES_OK) { @@ -2276,6 +2278,15 @@ int virtio_set_status(VirtIODevice *vdev, uint8_t va= l) vdev->status &=3D !VIRTIO_CONFIG_S_DRIVER_OK; } =20 + /* The device has been resumed */ + if ((!(vdev->status & VIRTIO_CONFIG_S_SUSPEND)) && + (old_status & VIRTIO_CONFIG_S_SUSPEND) && + (vdev->status & VIRTIO_CONFIG_S_DRIVER_OK) && + (vdev->config_interrupt_pending)) { + virtio_notify_config(vdev); + vdev->config_interrupt_pending =3D false; + } + return ret; } =20 @@ -2714,6 +2725,11 @@ void virtio_notify_config(VirtIODevice *vdev) if (!(vdev->status & VIRTIO_CONFIG_S_DRIVER_OK)) return; =20 + if (vdev->status & VIRTIO_CONFIG_S_SUSPEND) { + vdev->config_interrupt_pending =3D true; + return; + } + virtio_set_isr(vdev, 0x3); vdev->generation++; virtio_notify_vector(vdev, vdev->config_vector); diff --git a/include/hw/virtio/virtio.h b/include/hw/virtio/virtio.h index c594764f23..9d66076f75 100644 --- a/include/hw/virtio/virtio.h +++ b/include/hw/virtio/virtio.h @@ -167,6 +167,7 @@ struct VirtIODevice */ EventNotifier config_notifier; bool device_iotlb_enabled; + bool config_interrupt_pending; }; =20 struct VirtioDeviceClass { --=20 2.51.0