This allows callers to return better error messages instead of making one up while the real error ends up on stderr. Most callers can immediately make use of this because they already have an Error parameter themselves. The others just keep printing the error with error_report_err(). Signed-off-by: Kevin Wolf <kwolf@redhat.com> Message-Id: <20210609154658.350308-2-kwolf@redhat.com> Reviewed-by: Stefano Garzarella <sgarzare@redhat.com> Reviewed-by: Raphael Norwitz <raphael.norwitz@nutanix.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
243 lines
6.6 KiB
C
243 lines
6.6 KiB
C
/*
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* Virtio vsock device
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*
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* Copyright 2015 Red Hat, Inc.
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*
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* Authors:
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* Stefan Hajnoczi <stefanha@redhat.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or
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* (at your option) any later version. See the COPYING file in the
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* top-level directory.
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*/
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#include "qemu/osdep.h"
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#include "standard-headers/linux/virtio_vsock.h"
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#include "qapi/error.h"
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#include "hw/virtio/virtio-access.h"
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#include "qemu/error-report.h"
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#include "qemu/sockets.h"
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#include "hw/qdev-properties.h"
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#include "hw/virtio/vhost-vsock.h"
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#include "monitor/monitor.h"
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static void vhost_vsock_get_config(VirtIODevice *vdev, uint8_t *config)
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{
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VHostVSock *vsock = VHOST_VSOCK(vdev);
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struct virtio_vsock_config vsockcfg = {};
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virtio_stq_p(vdev, &vsockcfg.guest_cid, vsock->conf.guest_cid);
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memcpy(config, &vsockcfg, sizeof(vsockcfg));
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}
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static int vhost_vsock_set_guest_cid(VirtIODevice *vdev)
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{
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VHostVSockCommon *vvc = VHOST_VSOCK_COMMON(vdev);
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VHostVSock *vsock = VHOST_VSOCK(vdev);
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const VhostOps *vhost_ops = vvc->vhost_dev.vhost_ops;
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int ret;
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if (!vhost_ops->vhost_vsock_set_guest_cid) {
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return -ENOSYS;
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}
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ret = vhost_ops->vhost_vsock_set_guest_cid(&vvc->vhost_dev,
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vsock->conf.guest_cid);
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if (ret < 0) {
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return -errno;
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}
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return 0;
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}
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static int vhost_vsock_set_running(VirtIODevice *vdev, int start)
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{
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VHostVSockCommon *vvc = VHOST_VSOCK_COMMON(vdev);
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const VhostOps *vhost_ops = vvc->vhost_dev.vhost_ops;
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int ret;
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if (!vhost_ops->vhost_vsock_set_running) {
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return -ENOSYS;
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}
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ret = vhost_ops->vhost_vsock_set_running(&vvc->vhost_dev, start);
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if (ret < 0) {
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return -errno;
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}
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return 0;
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}
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static void vhost_vsock_set_status(VirtIODevice *vdev, uint8_t status)
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{
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VHostVSockCommon *vvc = VHOST_VSOCK_COMMON(vdev);
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bool should_start = status & VIRTIO_CONFIG_S_DRIVER_OK;
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int ret;
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if (!vdev->vm_running) {
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should_start = false;
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}
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if (vvc->vhost_dev.started == should_start) {
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return;
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}
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if (should_start) {
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ret = vhost_vsock_common_start(vdev);
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if (ret < 0) {
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return;
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}
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ret = vhost_vsock_set_running(vdev, 1);
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if (ret < 0) {
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vhost_vsock_common_stop(vdev);
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error_report("Error starting vhost vsock: %d", -ret);
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return;
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}
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} else {
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ret = vhost_vsock_set_running(vdev, 0);
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if (ret < 0) {
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error_report("vhost vsock set running failed: %d", ret);
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return;
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}
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vhost_vsock_common_stop(vdev);
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}
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}
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static uint64_t vhost_vsock_get_features(VirtIODevice *vdev,
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uint64_t requested_features,
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Error **errp)
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{
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/* No feature bits used yet */
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return requested_features;
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}
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static const VMStateDescription vmstate_virtio_vhost_vsock = {
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.name = "virtio-vhost_vsock",
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.minimum_version_id = VHOST_VSOCK_SAVEVM_VERSION,
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.version_id = VHOST_VSOCK_SAVEVM_VERSION,
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.fields = (VMStateField[]) {
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VMSTATE_VIRTIO_DEVICE,
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VMSTATE_END_OF_LIST()
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},
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.pre_save = vhost_vsock_common_pre_save,
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.post_load = vhost_vsock_common_post_load,
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};
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static void vhost_vsock_device_realize(DeviceState *dev, Error **errp)
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{
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VHostVSockCommon *vvc = VHOST_VSOCK_COMMON(dev);
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VirtIODevice *vdev = VIRTIO_DEVICE(dev);
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VHostVSock *vsock = VHOST_VSOCK(dev);
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int vhostfd;
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int ret;
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/* Refuse to use reserved CID numbers */
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if (vsock->conf.guest_cid <= 2) {
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error_setg(errp, "guest-cid property must be greater than 2");
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return;
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}
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if (vsock->conf.guest_cid > UINT32_MAX) {
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error_setg(errp, "guest-cid property must be a 32-bit number");
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return;
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}
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if (vsock->conf.vhostfd) {
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vhostfd = monitor_fd_param(monitor_cur(), vsock->conf.vhostfd, errp);
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if (vhostfd == -1) {
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error_prepend(errp, "vhost-vsock: unable to parse vhostfd: ");
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return;
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}
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ret = qemu_try_set_nonblock(vhostfd);
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if (ret < 0) {
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error_setg_errno(errp, -ret,
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"vhost-vsock: unable to set non-blocking mode");
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return;
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}
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} else {
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vhostfd = open("/dev/vhost-vsock", O_RDWR);
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if (vhostfd < 0) {
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error_setg_errno(errp, errno,
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"vhost-vsock: failed to open vhost device");
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return;
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}
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qemu_set_nonblock(vhostfd);
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}
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vhost_vsock_common_realize(vdev, "vhost-vsock");
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ret = vhost_dev_init(&vvc->vhost_dev, (void *)(uintptr_t)vhostfd,
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VHOST_BACKEND_TYPE_KERNEL, 0, errp);
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if (ret < 0) {
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goto err_virtio;
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}
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ret = vhost_vsock_set_guest_cid(vdev);
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if (ret < 0) {
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error_setg_errno(errp, -ret, "vhost-vsock: unable to set guest cid");
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goto err_vhost_dev;
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}
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return;
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err_vhost_dev:
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vhost_dev_cleanup(&vvc->vhost_dev);
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/* vhost_dev_cleanup() closes the vhostfd passed to vhost_dev_init() */
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vhostfd = -1;
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err_virtio:
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vhost_vsock_common_unrealize(vdev);
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if (vhostfd >= 0) {
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close(vhostfd);
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}
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return;
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}
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static void vhost_vsock_device_unrealize(DeviceState *dev)
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{
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VHostVSockCommon *vvc = VHOST_VSOCK_COMMON(dev);
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VirtIODevice *vdev = VIRTIO_DEVICE(dev);
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/* This will stop vhost backend if appropriate. */
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vhost_vsock_set_status(vdev, 0);
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vhost_dev_cleanup(&vvc->vhost_dev);
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vhost_vsock_common_unrealize(vdev);
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}
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static Property vhost_vsock_properties[] = {
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DEFINE_PROP_UINT64("guest-cid", VHostVSock, conf.guest_cid, 0),
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DEFINE_PROP_STRING("vhostfd", VHostVSock, conf.vhostfd),
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DEFINE_PROP_END_OF_LIST(),
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};
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static void vhost_vsock_class_init(ObjectClass *klass, void *data)
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{
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DeviceClass *dc = DEVICE_CLASS(klass);
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VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass);
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device_class_set_props(dc, vhost_vsock_properties);
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dc->vmsd = &vmstate_virtio_vhost_vsock;
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vdc->realize = vhost_vsock_device_realize;
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vdc->unrealize = vhost_vsock_device_unrealize;
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vdc->get_features = vhost_vsock_get_features;
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vdc->get_config = vhost_vsock_get_config;
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vdc->set_status = vhost_vsock_set_status;
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}
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static const TypeInfo vhost_vsock_info = {
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.name = TYPE_VHOST_VSOCK,
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.parent = TYPE_VHOST_VSOCK_COMMON,
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.instance_size = sizeof(VHostVSock),
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.class_init = vhost_vsock_class_init,
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};
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static void vhost_vsock_register_types(void)
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{
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type_register_static(&vhost_vsock_info);
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}
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type_init(vhost_vsock_register_types)
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