From 5e9be92d775208cf6cc9bf9a592853888046239e Mon Sep 17 00:00:00 2001 From: Nicholas Bellinger Date: Fri, 29 Mar 2013 01:08:16 +0000 Subject: vhost-scsi: new device supporting the tcm_vhost Linux kernel module The WWPN specified in configfs is passed to "-device vhost-scsi-pci". The tgpt field of the SET_ENDPOINT ioctl is obsolete now, so it is not available from the QEMU command-line. Instead, I hardcode it to zero. Changes in Patch-v2: - Add vhost_scsi_get_features() in order to determine feature bits supports by host kernel (mst + nab) - Re-enable usage of DEFINE_VIRTIO_COMMON_FEATURES, and allow EVENT_IDX to be disabled by host in vhost_scsi_get_features() - Drop unused hotplug bit in DEFINE_VHOST_SCSI_PROPERTIES Changes in Patch-v1: - Set event_idx=off by default (nab, thanks asias) - Disable hotplug feature bit for v3.9 tcm_vhost kernel code, need to re-enable in v3.10 (nab) - Update to latest qemu.git/master HEAD Changes in WIP-V3: - Drop ioeventfd vhost_scsi_properties (asias, thanks stefanha) - Add CONFIG_VHOST_SCSI (asias, thanks stefanha) - Add hotplug feature bit Changes in WIP-V2: - Add backend guest masking support (nab) - Bump ABI_VERSION to 1 (nab) - Set up set_guest_notifiers (asias) - Set up vs->dev.vq_index (asias) - Drop vs->vs.vdev.{set,clear}_vhost_endpoint (asias) - Drop VIRTIO_CONFIG_S_DRIVER check in vhost_scsi_set_status (asias) Howto: Use the latest seabios, at least commit b44a7be17b git clone git://git.seabios.org/seabios.git make cp out/bios.bin /usr/share/qemu/bios.bin qemu -device vhost-scsi-pci,wwpn=naa.6001405bd4e8476d,event_idx=off ... Cc: Michael S. Tsirkin Signed-off-by: Nicholas Bellinger Signed-off-by: Asias He [ Rebase on top of VirtIOSCSICommon patch, fix bugs in feature negotiation and irqfd masking - Paolo ] Signed-off-by: Paolo Bonzini --- hw/scsi/Makefile.objs | 6 +- hw/scsi/vhost-scsi.c | 288 ++++++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 293 insertions(+), 1 deletion(-) create mode 100644 hw/scsi/vhost-scsi.c (limited to 'hw/scsi') diff --git a/hw/scsi/Makefile.objs b/hw/scsi/Makefile.objs index eaec6c87ef..121ddc5cf4 100644 --- a/hw/scsi/Makefile.objs +++ b/hw/scsi/Makefile.objs @@ -6,4 +6,8 @@ common-obj-$(CONFIG_VMW_PVSCSI_SCSI_PCI) += vmw_pvscsi.o common-obj-$(CONFIG_ESP) += esp.o common-obj-$(CONFIG_ESP_PCI) += esp-pci.o obj-$(CONFIG_PSERIES) += spapr_vscsi.o -obj-$(CONFIG_VIRTIO) += virtio-scsi.o + +ifeq ($(CONFIG_VIRTIO),y) +obj-y += virtio-scsi.o +obj-$(CONFIG_VHOST_SCSI) += vhost-scsi.o +endif diff --git a/hw/scsi/vhost-scsi.c b/hw/scsi/vhost-scsi.c new file mode 100644 index 0000000000..3dd1a0f2ed --- /dev/null +++ b/hw/scsi/vhost-scsi.c @@ -0,0 +1,288 @@ +/* + * vhost_scsi host device + * + * Copyright IBM, Corp. 2011 + * + * Authors: + * Stefan Hajnoczi + * + * Changes for QEMU mainline + tcm_vhost kernel upstream: + * Nicholas Bellinger + * + * This work is licensed under the terms of the GNU LGPL, version 2 or later. + * See the COPYING.LIB file in the top-level directory. + * + */ + +#include +#include "config.h" +#include "qemu/queue.h" +#include "monitor/monitor.h" +#include "migration/migration.h" +#include "hw/virtio/vhost-scsi.h" +#include "hw/virtio/vhost.h" +#include "hw/virtio/virtio-scsi.h" + +static int vhost_scsi_set_endpoint(VHostSCSI *s) +{ + VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(s); + struct vhost_scsi_target backend; + int ret; + + memset(&backend, 0, sizeof(backend)); + pstrcpy(backend.vhost_wwpn, sizeof(backend.vhost_wwpn), vs->conf.wwpn); + ret = ioctl(s->dev.control, VHOST_SCSI_SET_ENDPOINT, &backend); + if (ret < 0) { + return -errno; + } + return 0; +} + +static void vhost_scsi_clear_endpoint(VHostSCSI *s) +{ + VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(s); + struct vhost_scsi_target backend; + + memset(&backend, 0, sizeof(backend)); + pstrcpy(backend.vhost_wwpn, sizeof(backend.vhost_wwpn), vs->conf.wwpn); + ioctl(s->dev.control, VHOST_SCSI_CLEAR_ENDPOINT, &backend); +} + +static int vhost_scsi_start(VHostSCSI *s) +{ + int ret, abi_version, i; + VirtIODevice *vdev = VIRTIO_DEVICE(s); + + if (!vdev->binding->set_guest_notifiers) { + error_report("binding does not support guest notifiers"); + return -ENOSYS; + } + + ret = ioctl(s->dev.control, VHOST_SCSI_GET_ABI_VERSION, &abi_version); + if (ret < 0) { + return -errno; + } + if (abi_version > VHOST_SCSI_ABI_VERSION) { + error_report("vhost-scsi: The running tcm_vhost kernel abi_version:" + " %d is greater than vhost_scsi userspace supports: %d, please" + " upgrade your version of QEMU\n", abi_version, + VHOST_SCSI_ABI_VERSION); + return -ENOSYS; + } + + ret = vhost_dev_enable_notifiers(&s->dev, vdev); + if (ret < 0) { + return ret; + } + + s->dev.acked_features = vdev->guest_features; + ret = vhost_dev_start(&s->dev, vdev); + if (ret < 0) { + error_report("Error start vhost dev"); + goto err_notifiers; + } + + ret = vhost_scsi_set_endpoint(s); + if (ret < 0) { + error_report("Error set vhost-scsi endpoint"); + goto err_vhost_stop; + } + + ret = vdev->binding->set_guest_notifiers(vdev->binding_opaque, s->dev.nvqs, true); + if (ret < 0) { + error_report("Error binding guest notifier"); + goto err_endpoint; + } + + /* guest_notifier_mask/pending not used yet, so just unmask + * everything here. virtio-pci will do the right thing by + * enabling/disabling irqfd. + */ + for (i = 0; i < s->dev.nvqs; i++) { + vhost_virtqueue_mask(&s->dev, vdev, i, false); + } + + return ret; + +err_endpoint: + vhost_scsi_clear_endpoint(s); +err_vhost_stop: + vhost_dev_stop(&s->dev, vdev); +err_notifiers: + vhost_dev_disable_notifiers(&s->dev, vdev); + return ret; +} + +static void vhost_scsi_stop(VHostSCSI *s) +{ + VirtIODevice *vdev = VIRTIO_DEVICE(s); + int ret = 0; + + if (!vdev->binding->set_guest_notifiers) { + ret = vdev->binding->set_guest_notifiers(vdev->binding_opaque, + s->dev.nvqs, false); + if (ret < 0) { + error_report("vhost guest notifier cleanup failed: %d\n", ret); + } + } + assert(ret >= 0); + + vhost_scsi_clear_endpoint(s); + vhost_dev_stop(&s->dev, vdev); + vhost_dev_disable_notifiers(&s->dev, vdev); +} + +static uint32_t vhost_scsi_get_features(VirtIODevice *vdev, + uint32_t features) +{ + VHostSCSI *s = VHOST_SCSI(vdev); + + /* Clear features not supported by host kernel. */ + if (!(s->dev.features & (1 << VIRTIO_F_NOTIFY_ON_EMPTY))) { + features &= ~(1 << VIRTIO_F_NOTIFY_ON_EMPTY); + } + if (!(s->dev.features & (1 << VIRTIO_RING_F_INDIRECT_DESC))) { + features &= ~(1 << VIRTIO_RING_F_INDIRECT_DESC); + } + if (!(s->dev.features & (1 << VIRTIO_RING_F_EVENT_IDX))) { + features &= ~(1 << VIRTIO_RING_F_EVENT_IDX); + } + if (!(s->dev.features & (1 << VIRTIO_SCSI_F_HOTPLUG))) { + features &= ~(1 << VIRTIO_SCSI_F_HOTPLUG); + } + + return features; +} + +static void vhost_scsi_set_config(VirtIODevice *vdev, + const uint8_t *config) +{ + VirtIOSCSIConfig *scsiconf = (VirtIOSCSIConfig *)config; + VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(vdev); + + if ((uint32_t) ldl_raw(&scsiconf->sense_size) != vs->sense_size || + (uint32_t) ldl_raw(&scsiconf->cdb_size) != vs->cdb_size) { + error_report("vhost-scsi does not support changing the sense data and CDB sizes"); + exit(1); + } +} + +static void vhost_scsi_set_status(VirtIODevice *vdev, uint8_t val) +{ + VHostSCSI *s = (VHostSCSI *)vdev; + bool start = (val & VIRTIO_CONFIG_S_DRIVER_OK); + + if (s->dev.started == start) { + return; + } + + if (start) { + int ret; + + ret = vhost_scsi_start(s); + if (ret < 0) { + error_report("virtio-scsi: unable to start vhost: %s\n", + strerror(-ret)); + + /* There is no userspace virtio-scsi fallback so exit */ + exit(1); + } + } else { + vhost_scsi_stop(s); + } +} + +static int vhost_scsi_init(VirtIODevice *vdev) +{ + VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(vdev); + VHostSCSI *s = VHOST_SCSI(vdev); + int vhostfd = -1; + int ret; + + if (!vs->conf.wwpn) { + error_report("vhost-scsi: missing wwpn\n"); + return -EINVAL; + } + + if (vs->conf.vhostfd) { + vhostfd = monitor_handle_fd_param(cur_mon, vs->conf.vhostfd); + if (vhostfd == -1) { + error_report("vhost-scsi: unable to parse vhostfd\n"); + return -EINVAL; + } + } + + ret = virtio_scsi_common_init(vs); + if (ret < 0) { + return ret; + } + + vdev->get_features = vhost_scsi_get_features; + vdev->set_config = vhost_scsi_set_config; + vdev->set_status = vhost_scsi_set_status; + + s->dev.nvqs = VHOST_SCSI_VQ_NUM_FIXED + vs->conf.num_queues; + s->dev.vqs = g_new(struct vhost_virtqueue, s->dev.nvqs); + s->dev.vq_index = 0; + + ret = vhost_dev_init(&s->dev, vhostfd, "/dev/vhost-scsi", true); + if (ret < 0) { + error_report("vhost-scsi: vhost initialization failed: %s\n", + strerror(-ret)); + return ret; + } + s->dev.backend_features = 0; + + error_setg(&s->migration_blocker, + "vhost-scsi does not support migration"); + migrate_add_blocker(s->migration_blocker); + + return 0; +} + +static int vhost_scsi_exit(DeviceState *qdev) +{ + VirtIODevice *vdev = VIRTIO_DEVICE(qdev); + VHostSCSI *s = VHOST_SCSI(qdev); + VirtIOSCSICommon *vs = VIRTIO_SCSI_COMMON(qdev); + + migrate_del_blocker(s->migration_blocker); + error_free(s->migration_blocker); + + /* This will stop vhost backend. */ + vhost_scsi_set_status(vdev, 0); + + g_free(s->dev.vqs); + return virtio_scsi_common_exit(vs); +} + +static Property vhost_scsi_properties[] = { + DEFINE_VHOST_SCSI_PROPERTIES(VHostSCSI, parent_obj.conf), + DEFINE_PROP_END_OF_LIST(), +}; + +static void vhost_scsi_class_init(ObjectClass *klass, void *data) +{ + DeviceClass *dc = DEVICE_CLASS(klass); + VirtioDeviceClass *vdc = VIRTIO_DEVICE_CLASS(klass); + dc->exit = vhost_scsi_exit; + dc->props = vhost_scsi_properties; + vdc->init = vhost_scsi_init; + vdc->get_features = vhost_scsi_get_features; + vdc->set_config = vhost_scsi_set_config; + vdc->set_status = vhost_scsi_set_status; +} + +static const TypeInfo vhost_scsi_info = { + .name = TYPE_VHOST_SCSI, + .parent = TYPE_VIRTIO_SCSI_COMMON, + .instance_size = sizeof(VHostSCSI), + .class_init = vhost_scsi_class_init, +}; + +static void virtio_register_types(void) +{ + type_register_static(&vhost_scsi_info); +} + +type_init(virtio_register_types) -- cgit v1.2.3