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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