332 lines
9.6 KiB
C
332 lines
9.6 KiB
C
/*
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* vhost_scsi host device
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*
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* Copyright IBM, Corp. 2011
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*
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* Authors:
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* Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>
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*
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* Changes for QEMU mainline + tcm_vhost kernel upstream:
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* Nicholas Bellinger <nab@risingtidesystems.com>
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*
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* This work is licensed under the terms of the GNU LGPL, version 2 or later.
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* See the COPYING.LIB file in the top-level directory.
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*
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*/
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#include "qemu/osdep.h"
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#include <linux/vhost.h>
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#include <sys/ioctl.h>
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#include "qapi/error.h"
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#include "qemu/error-report.h"
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#include "qemu/module.h"
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#include "monitor/monitor.h"
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#include "migration/blocker.h"
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#include "hw/virtio/vhost-scsi.h"
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#include "hw/virtio/vhost.h"
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#include "hw/virtio/virtio-scsi.h"
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#include "hw/virtio/virtio-bus.h"
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#include "hw/virtio/virtio-access.h"
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#include "hw/fw-path-provider.h"
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#include "hw/qdev-properties.h"
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#include "qemu/cutils.h"
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#include "sysemu/sysemu.h"
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/* Features supported by host kernel. */
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static const int kernel_feature_bits[] = {
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VIRTIO_F_NOTIFY_ON_EMPTY,
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VIRTIO_RING_F_INDIRECT_DESC,
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VIRTIO_RING_F_EVENT_IDX,
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VIRTIO_SCSI_F_HOTPLUG,
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VHOST_INVALID_FEATURE_BIT
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};
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static int vhost_scsi_set_endpoint(VHostSCSI *s)
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{
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VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(s);
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VHostSCSICommon *vsc = VHOST_SCSI_COMMON(s);
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const VhostOps *vhost_ops = vsc->dev.vhost_ops;
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struct vhost_scsi_target backend;
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int ret;
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memset(&backend, 0, sizeof(backend));
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pstrcpy(backend.vhost_wwpn, sizeof(backend.vhost_wwpn), vs->conf.wwpn);
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ret = vhost_ops->vhost_scsi_set_endpoint(&vsc->dev, &backend);
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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_scsi_clear_endpoint(VHostSCSI *s)
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{
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VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(s);
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VHostSCSICommon *vsc = VHOST_SCSI_COMMON(s);
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struct vhost_scsi_target backend;
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const VhostOps *vhost_ops = vsc->dev.vhost_ops;
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memset(&backend, 0, sizeof(backend));
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pstrcpy(backend.vhost_wwpn, sizeof(backend.vhost_wwpn), vs->conf.wwpn);
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vhost_ops->vhost_scsi_clear_endpoint(&vsc->dev, &backend);
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}
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static int vhost_scsi_start(VHostSCSI *s)
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{
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int ret, abi_version;
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VHostSCSICommon *vsc = VHOST_SCSI_COMMON(s);
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const VhostOps *vhost_ops = vsc->dev.vhost_ops;
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ret = vhost_ops->vhost_scsi_get_abi_version(&vsc->dev, &abi_version);
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if (ret < 0) {
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return -errno;
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}
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if (abi_version > VHOST_SCSI_ABI_VERSION) {
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error_report("vhost-scsi: The running tcm_vhost kernel abi_version:"
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" %d is greater than vhost_scsi userspace supports: %d,"
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" please upgrade your version of QEMU", abi_version,
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VHOST_SCSI_ABI_VERSION);
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return -ENOSYS;
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}
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ret = vhost_scsi_common_start(vsc);
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if (ret < 0) {
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return ret;
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}
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ret = vhost_scsi_set_endpoint(s);
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if (ret < 0) {
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error_report("Error setting vhost-scsi endpoint");
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vhost_scsi_common_stop(vsc);
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}
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return ret;
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}
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static void vhost_scsi_stop(VHostSCSI *s)
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{
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VHostSCSICommon *vsc = VHOST_SCSI_COMMON(s);
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vhost_scsi_clear_endpoint(s);
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vhost_scsi_common_stop(vsc);
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}
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static void vhost_scsi_set_status(VirtIODevice *vdev, uint8_t val)
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{
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VHostSCSI *s = VHOST_SCSI(vdev);
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VHostSCSICommon *vsc = VHOST_SCSI_COMMON(s);
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bool start = (val & VIRTIO_CONFIG_S_DRIVER_OK);
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if (!vdev->vm_running) {
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start = false;
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}
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if (vsc->dev.started == start) {
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return;
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}
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if (start) {
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int ret;
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ret = vhost_scsi_start(s);
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if (ret < 0) {
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error_report("unable to start vhost-scsi: %s", strerror(-ret));
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exit(1);
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}
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} else {
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vhost_scsi_stop(s);
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}
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}
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static void vhost_dummy_handle_output(VirtIODevice *vdev, VirtQueue *vq)
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{
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}
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static int vhost_scsi_pre_save(void *opaque)
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{
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VHostSCSICommon *vsc = opaque;
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/* At this point, backend must be stopped, otherwise
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* it might keep writing to memory. */
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assert(!vsc->dev.started);
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return 0;
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}
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static const VMStateDescription vmstate_virtio_vhost_scsi = {
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.name = "virtio-vhost_scsi",
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.minimum_version_id = 1,
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.version_id = 1,
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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_scsi_pre_save,
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};
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static void vhost_scsi_realize(DeviceState *dev, Error **errp)
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{
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VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(dev);
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VHostSCSICommon *vsc = VHOST_SCSI_COMMON(dev);
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Error *err = NULL;
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int vhostfd = -1;
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int ret;
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if (!vs->conf.wwpn) {
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error_setg(errp, "vhost-scsi: missing wwpn");
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return;
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}
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if (vs->conf.vhostfd) {
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vhostfd = monitor_fd_param(cur_mon, vs->conf.vhostfd, errp);
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if (vhostfd == -1) {
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error_prepend(errp, "vhost-scsi: unable to parse vhostfd: ");
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return;
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}
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} else {
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vhostfd = open("/dev/vhost-scsi", O_RDWR);
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if (vhostfd < 0) {
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error_setg(errp, "vhost-scsi: open vhost char device failed: %s",
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strerror(errno));
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return;
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}
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}
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virtio_scsi_common_realize(dev,
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vhost_dummy_handle_output,
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vhost_dummy_handle_output,
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vhost_dummy_handle_output,
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&err);
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if (err != NULL) {
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error_propagate(errp, err);
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goto close_fd;
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}
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if (!vsc->migratable) {
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error_setg(&vsc->migration_blocker,
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"vhost-scsi does not support migration in all cases. "
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"When external environment supports it (Orchestrator migrates "
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"target SCSI device state or use shared storage over network), "
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"set 'migratable' property to true to enable migration.");
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if (migrate_add_blocker(vsc->migration_blocker, errp) < 0) {
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error_free(vsc->migration_blocker);
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goto free_virtio;
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}
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}
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vsc->dev.nvqs = VHOST_SCSI_VQ_NUM_FIXED + vs->conf.num_queues;
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vsc->dev.vqs = g_new0(struct vhost_virtqueue, vsc->dev.nvqs);
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vsc->dev.vq_index = 0;
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vsc->dev.backend_features = 0;
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ret = vhost_dev_init(&vsc->dev, (void *)(uintptr_t)vhostfd,
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VHOST_BACKEND_TYPE_KERNEL, 0);
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if (ret < 0) {
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error_setg(errp, "vhost-scsi: vhost initialization failed: %s",
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strerror(-ret));
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goto free_vqs;
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}
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/* At present, channel and lun both are 0 for bootable vhost-scsi disk */
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vsc->channel = 0;
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vsc->lun = 0;
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/* Note: we can also get the minimum tpgt from kernel */
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vsc->target = vs->conf.boot_tpgt;
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return;
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free_vqs:
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if (!vsc->migratable) {
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migrate_del_blocker(vsc->migration_blocker);
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}
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g_free(vsc->dev.vqs);
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free_virtio:
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virtio_scsi_common_unrealize(dev);
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close_fd:
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close(vhostfd);
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return;
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}
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static void vhost_scsi_unrealize(DeviceState *dev)
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{
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VirtIODevice *vdev = VIRTIO_DEVICE(dev);
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VHostSCSICommon *vsc = VHOST_SCSI_COMMON(dev);
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struct vhost_virtqueue *vqs = vsc->dev.vqs;
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if (!vsc->migratable) {
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migrate_del_blocker(vsc->migration_blocker);
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error_free(vsc->migration_blocker);
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}
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/* This will stop vhost backend. */
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vhost_scsi_set_status(vdev, 0);
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vhost_dev_cleanup(&vsc->dev);
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g_free(vqs);
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virtio_scsi_common_unrealize(dev);
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}
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static Property vhost_scsi_properties[] = {
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DEFINE_PROP_STRING("vhostfd", VirtIOSCSICommon, conf.vhostfd),
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DEFINE_PROP_STRING("wwpn", VirtIOSCSICommon, conf.wwpn),
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DEFINE_PROP_UINT32("boot_tpgt", VirtIOSCSICommon, conf.boot_tpgt, 0),
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DEFINE_PROP_UINT32("num_queues", VirtIOSCSICommon, conf.num_queues, 1),
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DEFINE_PROP_UINT32("virtqueue_size", VirtIOSCSICommon, conf.virtqueue_size,
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128),
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DEFINE_PROP_BOOL("seg_max_adjust", VirtIOSCSICommon, conf.seg_max_adjust,
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true),
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DEFINE_PROP_UINT32("max_sectors", VirtIOSCSICommon, conf.max_sectors,
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0xFFFF),
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DEFINE_PROP_UINT32("cmd_per_lun", VirtIOSCSICommon, conf.cmd_per_lun, 128),
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DEFINE_PROP_BIT64("t10_pi", VHostSCSICommon, host_features,
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VIRTIO_SCSI_F_T10_PI,
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false),
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DEFINE_PROP_BOOL("migratable", VHostSCSICommon, migratable, false),
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DEFINE_PROP_END_OF_LIST(),
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};
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static void vhost_scsi_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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FWPathProviderClass *fwc = FW_PATH_PROVIDER_CLASS(klass);
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device_class_set_props(dc, vhost_scsi_properties);
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dc->vmsd = &vmstate_virtio_vhost_scsi;
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set_bit(DEVICE_CATEGORY_STORAGE, dc->categories);
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vdc->realize = vhost_scsi_realize;
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vdc->unrealize = vhost_scsi_unrealize;
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vdc->get_features = vhost_scsi_common_get_features;
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vdc->set_config = vhost_scsi_common_set_config;
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vdc->set_status = vhost_scsi_set_status;
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fwc->get_dev_path = vhost_scsi_common_get_fw_dev_path;
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}
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static void vhost_scsi_instance_init(Object *obj)
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{
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VHostSCSICommon *vsc = VHOST_SCSI_COMMON(obj);
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vsc->feature_bits = kernel_feature_bits;
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device_add_bootindex_property(obj, &vsc->bootindex, "bootindex", NULL,
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DEVICE(vsc));
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}
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static const TypeInfo vhost_scsi_info = {
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.name = TYPE_VHOST_SCSI,
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.parent = TYPE_VHOST_SCSI_COMMON,
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.instance_size = sizeof(VHostSCSI),
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.class_init = vhost_scsi_class_init,
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.instance_init = vhost_scsi_instance_init,
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.interfaces = (InterfaceInfo[]) {
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{ TYPE_FW_PATH_PROVIDER },
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{ }
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},
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};
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static void virtio_register_types(void)
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{
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type_register_static(&vhost_scsi_info);
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}
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type_init(virtio_register_types)
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