diff options
Diffstat (limited to 'hw/virtio/vhost-vsock.c')
-rw-r--r-- | hw/virtio/vhost-vsock.c | 239 |
1 files changed, 239 insertions, 0 deletions
diff --git a/hw/virtio/vhost-vsock.c b/hw/virtio/vhost-vsock.c new file mode 100644 index 00000000..aa16d584 --- /dev/null +++ b/hw/virtio/vhost-vsock.c @@ -0,0 +1,239 @@ +/* + * Virtio vsock device + * + * Copyright 2015 Red Hat, Inc. + * + * Authors: + * Stefan Hajnoczi <stefanha@redhat.com> + * + * This work is licensed under the terms of the GNU GPL, version 2 or + * (at your option) any later version. See the COPYING file in the + * top-level directory. + */ + +#include "qemu/osdep.h" +#include "standard-headers/linux/virtio_vsock.h" +#include "qapi/error.h" +#include "hw/virtio/virtio-access.h" +#include "qemu/error-report.h" +#include "qemu/sockets.h" +#include "hw/qdev-properties.h" +#include "hw/virtio/vhost-vsock.h" +#include "monitor/monitor.h" + +static void vhost_vsock_get_config(VirtIODevice *vdev, uint8_t *config) +{ + VHostVSock *vsock = VHOST_VSOCK(vdev); + struct virtio_vsock_config vsockcfg = {}; + + virtio_stq_p(vdev, &vsockcfg.guest_cid, vsock->conf.guest_cid); + memcpy(config, &vsockcfg, sizeof(vsockcfg)); +} + +static int vhost_vsock_set_guest_cid(VirtIODevice *vdev) +{ + VHostVSockCommon *vvc = VHOST_VSOCK_COMMON(vdev); + VHostVSock *vsock = VHOST_VSOCK(vdev); + const VhostOps *vhost_ops = vvc->vhost_dev.vhost_ops; + int ret; + + if (!vhost_ops->vhost_vsock_set_guest_cid) { + return -ENOSYS; + } + + ret = vhost_ops->vhost_vsock_set_guest_cid(&vvc->vhost_dev, + vsock->conf.guest_cid); + if (ret < 0) { + return -errno; + } + return 0; +} + +static int vhost_vsock_set_running(VirtIODevice *vdev, int start) +{ + VHostVSockCommon *vvc = VHOST_VSOCK_COMMON(vdev); + const VhostOps *vhost_ops = vvc->vhost_dev.vhost_ops; + int ret; + + if (!vhost_ops->vhost_vsock_set_running) { + return -ENOSYS; + } + + ret = vhost_ops->vhost_vsock_set_running(&vvc->vhost_dev, start); + if (ret < 0) { + return -errno; + } + return 0; +} + + +static void vhost_vsock_set_status(VirtIODevice *vdev, uint8_t status) +{ + VHostVSockCommon *vvc = VHOST_VSOCK_COMMON(vdev); + bool should_start = virtio_device_should_start(vdev, status); + int ret; + + if (vhost_dev_is_started(&vvc->vhost_dev) == should_start) { + return; + } + + if (should_start) { + ret = vhost_vsock_common_start(vdev); + if (ret < 0) { + return; + } + + ret = vhost_vsock_set_running(vdev, 1); + if (ret < 0) { + vhost_vsock_common_stop(vdev); + error_report("Error starting vhost vsock: %d", -ret); + return; + } + } else { + ret = vhost_vsock_set_running(vdev, 0); + if (ret < 0) { + error_report("vhost vsock set running failed: %d", ret); + return; + } + + vhost_vsock_common_stop(vdev); + } +} + +static uint64_t vhost_vsock_get_features(VirtIODevice *vdev, + uint64_t requested_features, + Error **errp) +{ + return vhost_vsock_common_get_features(vdev, requested_features, errp); +} + +static const VMStateDescription vmstate_virtio_vhost_vsock = { + .name = "virtio-vhost_vsock", + .minimum_version_id = VHOST_VSOCK_SAVEVM_VERSION, + .version_id = VHOST_VSOCK_SAVEVM_VERSION, + .fields = (VMStateField[]) { + VMSTATE_VIRTIO_DEVICE, + VMSTATE_END_OF_LIST() + }, + .pre_save = vhost_vsock_common_pre_save, + .post_load = vhost_vsock_common_post_load, +}; + +static void vhost_vsock_device_realize(DeviceState *dev, Error **errp) +{ + VHostVSockCommon *vvc = VHOST_VSOCK_COMMON(dev); + VirtIODevice *vdev = VIRTIO_DEVICE(dev); + VHostVSock *vsock = VHOST_VSOCK(dev); + int vhostfd; + int ret; + + /* Refuse to use reserved CID numbers */ + if (vsock->conf.guest_cid <= 2) { + error_setg(errp, "guest-cid property must be greater than 2"); + return; + } + + if (vsock->conf.guest_cid > UINT32_MAX) { + error_setg(errp, "guest-cid property must be a 32-bit number"); + return; + } + + if (vsock->conf.vhostfd) { + vhostfd = monitor_fd_param(monitor_cur(), vsock->conf.vhostfd, errp); + if (vhostfd == -1) { + error_prepend(errp, "vhost-vsock: unable to parse vhostfd: "); + return; + } + + if (!g_unix_set_fd_nonblocking(vhostfd, true, NULL)) { + error_setg_errno(errp, errno, + "vhost-vsock: unable to set non-blocking mode"); + return; + } + } else { + vhostfd = open("/dev/vhost-vsock", O_RDWR); + if (vhostfd < 0) { + error_setg_errno(errp, errno, + "vhost-vsock: failed to open vhost device"); + return; + } + + if (!g_unix_set_fd_nonblocking(vhostfd, true, NULL)) { + error_setg_errno(errp, errno, + "Failed to set FD nonblocking"); + return; + } + } + + vhost_vsock_common_realize(vdev); + + ret = vhost_dev_init(&vvc->vhost_dev, (void *)(uintptr_t)vhostfd, + VHOST_BACKEND_TYPE_KERNEL, 0, errp); + if (ret < 0) { + /* + * vhostfd is closed by vhost_dev_cleanup, which is called + * by vhost_dev_init on initialization error. + */ + goto err_virtio; + } + + ret = vhost_vsock_set_guest_cid(vdev); + if (ret < 0) { + error_setg_errno(errp, -ret, "vhost-vsock: unable to set guest cid"); + goto err_vhost_dev; + } + + return; + +err_vhost_dev: + /* vhost_dev_cleanup() closes the vhostfd passed to vhost_dev_init() */ + vhost_dev_cleanup(&vvc->vhost_dev); +err_virtio: + vhost_vsock_common_unrealize(vdev); +} + +static void vhost_vsock_device_unrealize(DeviceState *dev) +{ + VHostVSockCommon *vvc = VHOST_VSOCK_COMMON(dev); + VirtIODevice *vdev = VIRTIO_DEVICE(dev); + + /* This will stop vhost backend if appropriate. */ + vhost_vsock_set_status(vdev, 0); + + vhost_dev_cleanup(&vvc->vhost_dev); + vhost_vsock_common_unrealize(vdev); +} + +static Property vhost_vsock_properties[] = { + DEFINE_PROP_UINT64("guest-cid", VHostVSock, conf.guest_cid, 0), + DEFINE_PROP_STRING("vhostfd", VHostVSock, conf.vhostfd), + DEFINE_PROP_END_OF_LIST(), +}; + +static void vhost_vsock_class_init(ObjectClass *klass, void *data) +{ + DeviceClass *dc = DEVICE_CLASS(klass); + VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass); + + device_class_set_props(dc, vhost_vsock_properties); + dc->vmsd = &vmstate_virtio_vhost_vsock; + vdc->realize = vhost_vsock_device_realize; + vdc->unrealize = vhost_vsock_device_unrealize; + vdc->get_features = vhost_vsock_get_features; + vdc->get_config = vhost_vsock_get_config; + vdc->set_status = vhost_vsock_set_status; +} + +static const TypeInfo vhost_vsock_info = { + .name = TYPE_VHOST_VSOCK, + .parent = TYPE_VHOST_VSOCK_COMMON, + .instance_size = sizeof(VHostVSock), + .class_init = vhost_vsock_class_init, +}; + +static void vhost_vsock_register_types(void) +{ + type_register_static(&vhost_vsock_info); +} + +type_init(vhost_vsock_register_types) |