[pve-devel] Fwd: [RFC-v3 3/5] vhost-scsi: add -vhost-scsi host device for use with tcm-vhost
Alexandre DERUMIER
aderumier at odiso.com
Fri Sep 7 09:40:45 CEST 2012
maybe this new qemu patch can help for scsi tapes?
(But require kernel 3.6 )
----- Mail transféré -----
De: "Michael S. Tsirkin" <mst at redhat.com>
À: "Nicholas A. Bellinger" <nab at linux-iscsi.org>
Cc: "target-devel" <target-devel at vger.kernel.org>, "lf-virt" <virtualization at lists.linux-foundation.org>, "kvm-devel" <kvm at vger.kernel.org>, "qemu-devel" <qemu-devel at nongnu.org>, "Stefan Hajnoczi" <stefanha at linux.vnet.ibm.com>, "Zhi Yong Wu" <wuzhy at cn.ibm.com>, "Anthony Liguori" <aliguori at linux.vnet.ibm.com>, "Paolo Bonzini" <pbonzini at redhat.com>, "Christoph Hellwig" <hch at lst.de>, "Hannes Reinecke" <hare at suse.de>, "Jan Kiszka" <jan.kiszka at siemens.com>, "Zhi Yong Wu" <wuzhy at linux.vnet.ibm.com>, "Anthony Liguori" <aliguori at us.ibm.com>
Envoyé: Vendredi 7 Septembre 2012 08:20:27
Objet: Re: [RFC-v3 3/5] vhost-scsi: add -vhost-scsi host device for use with tcm-vhost
On Tue, Aug 21, 2012 at 08:52:09PM +0000, Nicholas A. Bellinger wrote:
> From: Stefan Hajnoczi <stefanha at linux.vnet.ibm.com>
>
> This patch adds a new type of host device that drives the vhost_scsi
> device. The syntax to add vhost-scsi is:
>
> qemu -vhost-scsi id=vhost-scsi0,wwpn=...,tpgt=123
>
> The virtio-scsi emulated device will make use of vhost-scsi to process
> virtio-scsi requests inside the kernel and hand them to the in-kernel
> SCSI target stack using the tcm_vhost fabric driver.
>
> The tcm_vhost driver was merged into the upstream linux kernel for 3.6-rc2,
> and the commit can be found here:
>
> http://git.kernel.org/?p=linux/kernel/git/torvalds/linux.git;a=commitdiff;h=057cbf49a1f08297
>
In the future, please put changelog after --- or in the cover
letter: we do not need it in git history.
I fixed this up.
> Changelog v2 -> v3:
>
> - Move qdev_prop_vhost_scsi + DEFINE_PROP_VHOST_SCSI defs into vhost-scsi.[c,h]
> (reported by MST)
> - Add enum vhost_scsi_vq_list for VHostSCSI->vqs[] enumeration (reported by MST)
> - Add missing braces around single like if statement to following QEMU
> style (reported by Blue Swirl)
> - Change vhost_scsi_target->vhost_wwpn to char *, in order to drop casts to
> pstrcpy in vhost_scsi_start() + vhost_scsi_stop() (reported by Blue Swirl)
> - Change VHOST_SCSI_GET_ABI_VERSION to 'int' type (MST)
> - Fix 4 byte alignment of vhost_scsi_target (MST)
> - Convert fprintf(stderr, ...) usage to -> error_report() (reported by MST)
> - Do explict memset of backend before calling VHOST_SCSI_CLEAR_ENDPOINT
> in vhost_scsi_stop() (reported by MST)
> - Add support for vhostfd passing in vhost_scsi_add() (reported by MST)
> - Change vhost_scsi_add() to use monitor_handle_fd_param() (reported by MST)
>
> Changelog v1 -> v2:
>
> - Expose ABI version via VHOST_SCSI_GET_ABI_VERSION + use Rev 0 as
> starting point for v3.6-rc code (Stefan + ALiguori + nab)
> - Fix upstream qemu conflict in hw/qdev-properties.c
> - Make GET_ABI_VERSION use int (nab + mst)
> - Fix vhost-scsi case lables in configure (reported by paolo)
> - Convert qdev_prop_vhost_scsi to use ->get() + ->set() following
> qdev_prop_netdev (reported by paolo)
> - Fix typo in qemu-options.hx definition of vhost-scsi (reported by paolo)
>
> Changelog v0 -> v1:
>
> - Add VHOST_SCSI_SET_ENDPOINT call (stefan)
> - Enable vhost notifiers for multiple queues (Zhi)
> - clear vhost-scsi endpoint on stopped (Zhi)
> - Add CONFIG_VHOST_SCSI for QEMU build configure (nab)
> - Rename vhost_vring_target -> vhost_scsi_target (mst + nab)
> - Add support for VHOST_SCSI_GET_ABI_VERSION ioctl (aliguori + nab)
>
> Cc: Stefan Hajnoczi <stefanha at linux.vnet.ibm.com>
> Cc: Zhi Yong Wu <wuzhy at linux.vnet.ibm.com>
> Cc: Anthony Liguori <aliguori at us.ibm.com>
> Cc: Paolo Bonzini <pbonzini at redhat.com>
> Cc: Michael S. Tsirkin <mst at redhat.com>
> Signed-off-by: Nicholas Bellinger <nab at linux-iscsi.org>
> ---
> configure | 10 +++
> hw/Makefile.objs | 1 +
> hw/qdev-properties.c | 41 +++++++++++
> hw/vhost-scsi.c | 190 ++++++++++++++++++++++++++++++++++++++++++++++++++
> hw/vhost-scsi.h | 62 ++++++++++++++++
> qemu-common.h | 1 +
> qemu-config.c | 19 +++++
> qemu-options.hx | 4 +
> vl.c | 18 +++++
> 9 files changed, 346 insertions(+), 0 deletions(-)
> create mode 100644 hw/vhost-scsi.c
> create mode 100644 hw/vhost-scsi.h
>
> diff --git a/configure b/configure
> index f0dbc03..1f03202 100755
> --- a/configure
> +++ b/configure
> @@ -168,6 +168,7 @@ libattr=""
> xfs=""
>
> vhost_net="no"
> +vhost_scsi="no"
> kvm="no"
> gprof="no"
> debug_tcg="no"
> @@ -513,6 +514,7 @@ Haiku)
> usb="linux"
> kvm="yes"
> vhost_net="yes"
> + vhost_scsi="yes"
> if [ "$cpu" = "i386" -o "$cpu" = "x86_64" ] ; then
> audio_possible_drivers="$audio_possible_drivers fmod"
> fi
> @@ -818,6 +820,10 @@ for opt do
> ;;
> --enable-vhost-net) vhost_net="yes"
> ;;
> + --disable-vhost-scsi) vhost_scsi="no"
> + ;;
> + --enable-vhost-scsi) vhost_scsi="yes"
> + ;;
> --disable-opengl) opengl="no"
> ;;
> --enable-opengl) opengl="yes"
> @@ -3116,6 +3122,7 @@ echo "posix_madvise $posix_madvise"
> echo "uuid support $uuid"
> echo "libcap-ng support $cap_ng"
> echo "vhost-net support $vhost_net"
> +echo "vhost-scsi support $vhost_scsi"
> echo "Trace backend $trace_backend"
> echo "Trace output file $trace_file-<pid>"
> echo "spice support $spice"
> @@ -3828,6 +3835,9 @@ case "$target_arch2" in
> if test "$vhost_net" = "yes" ; then
> echo "CONFIG_VHOST_NET=y" >> $config_target_mak
> fi
> + if test "$vhost_scsi" = "yes" ; then
> + echo "CONFIG_VHOST_SCSI=y" >> $config_target_mak
> + fi
> fi
> esac
> case "$target_arch2" in
> diff --git a/hw/Makefile.objs b/hw/Makefile.objs
> index 3ba5dd0..6ab75ec 100644
> --- a/hw/Makefile.objs
> +++ b/hw/Makefile.objs
> @@ -169,6 +169,7 @@ obj-$(CONFIG_VIRTIO) += virtio.o virtio-blk.o virtio-balloon.o virtio-net.o
> obj-$(CONFIG_VIRTIO) += virtio-serial-bus.o virtio-scsi.o
> obj-$(CONFIG_SOFTMMU) += vhost_net.o
> obj-$(CONFIG_VHOST_NET) += vhost.o
> +obj-$(CONFIG_VHOST_SCSI) += vhost-scsi.o
> obj-$(CONFIG_REALLY_VIRTFS) += 9pfs/
> obj-$(CONFIG_NO_PCI) += pci-stub.o
> obj-$(CONFIG_VGA) += vga.o
> diff --git a/hw/qdev-properties.c b/hw/qdev-properties.c
> index 8aca0d4..8b505ca 100644
> --- a/hw/qdev-properties.c
> +++ b/hw/qdev-properties.c
> @@ -4,6 +4,7 @@
> #include "blockdev.h"
> #include "hw/block-common.h"
> #include "net/hub.h"
> +#include "vhost-scsi.h"
>
> void *qdev_get_prop_ptr(DeviceState *dev, Property *prop)
> {
> @@ -696,6 +697,46 @@ PropertyInfo qdev_prop_vlan = {
> .set = set_vlan,
> };
>
> +/* --- vhost-scsi --- */
> +
> +static int parse_vhost_scsi_dev(DeviceState *dev, const char *str, void **ptr)
> +{
> + VHostSCSI *p;
> +
> + p = find_vhost_scsi(str);
> + if (p == NULL) {
> + return -ENOENT;
> + }
> +
> + *ptr = p;
> + return 0;
> +}
> +
> +static const char *print_vhost_scsi_dev(void *ptr)
> +{
> + VHostSCSI *p = ptr;
> +
> + return (p) ? vhost_scsi_get_id(p) : "<null>";
> +}
> +
> +static void get_vhost_scsi_dev(Object *obj, Visitor *v, void *opaque,
> + const char *name, Error **errp)
> +{
> + get_pointer(obj, v, opaque, print_vhost_scsi_dev, name, errp);
> +}
> +
> +static void set_vhost_scsi_dev(Object *obj, Visitor *v, void *opaque,
> + const char *name, Error **errp)
> +{
> + set_pointer(obj, v, opaque, parse_vhost_scsi_dev, name, errp);
> +}
> +
> +PropertyInfo qdev_prop_vhost_scsi = {
> + .name = "vhost-scsi",
> + .get = get_vhost_scsi_dev,
> + .set = set_vhost_scsi_dev,
> +};
> +
> /* --- pointer --- */
>
> /* Not a proper property, just for dirty hacks. TODO Remove it! */
> diff --git a/hw/vhost-scsi.c b/hw/vhost-scsi.c
> new file mode 100644
> index 0000000..96da2fc
> --- /dev/null
> +++ b/hw/vhost-scsi.c
> @@ -0,0 +1,190 @@
> +/*
> + * vhost_scsi host device
> + *
> + * Copyright IBM, Corp. 2011
> + *
> + * Authors:
> + * Stefan Hajnoczi <stefanha at linux.vnet.ibm.com>
> + *
> + * Changes for QEMU mainline + tcm_vhost kernel upstream:
> + * Nicholas Bellinger <nab at risingtidesystems.com>
> + *
> + * 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 <sys/ioctl.h>
> +#include "config.h"
> +#include "qemu-queue.h"
> +#include "monitor.h"
> +#include "vhost-scsi.h"
> +#include "vhost.h"
> +
> +struct VHostSCSI {
> + const char *id;
> + const char *wwpn;
> + uint16_t tpgt;
> + int vhostfd;
> + struct vhost_dev dev;
> + struct vhost_virtqueue vqs[VHOST_SCSI_VQ_NUM];
> + QLIST_ENTRY(VHostSCSI) list;
> +};
> +
> +static QLIST_HEAD(, VHostSCSI) vhost_scsi_list =
> + QLIST_HEAD_INITIALIZER(vhost_scsi_list);
> +
> +VHostSCSI *find_vhost_scsi(const char *id)
> +{
> + VHostSCSI *vs;
> +
> + QLIST_FOREACH(vs, &vhost_scsi_list, list) {
> + if (!strcmp(id, vs->id)) {
> + return vs;
> + }
> + }
> + return NULL;
> +}
> +
> +const char *vhost_scsi_get_id(VHostSCSI *vs)
> +{
> + return vs->id;
> +}
> +
> +int vhost_scsi_start(VHostSCSI *vs, VirtIODevice *vdev)
> +{
> + int ret, abi_version;
> + struct vhost_scsi_target backend;
> +
> + if (!vhost_dev_query(&vs->dev, vdev)) {
> + return -ENOTSUP;
> + }
> +
> + vs->dev.nvqs = VHOST_SCSI_VQ_NUM;
> + vs->dev.vqs = vs->vqs;
> +
> + ret = vhost_dev_enable_notifiers(&vs->dev, vdev);
> + if (ret < 0) {
> + return ret;
> + }
> +
> + ret = vhost_dev_start(&vs->dev, vdev);
> + if (ret < 0) {
> + return ret;
> + }
> +
> + ret = ioctl(vs->dev.control, VHOST_SCSI_GET_ABI_VERSION, &abi_version);
> + if (ret < 0) {
> + ret = -errno;
> + vhost_dev_stop(&vs->dev, vdev);
> + return ret;
> + }
> + 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);
> + ret = -ENOSYS;
> + vhost_dev_stop(&vs->dev, vdev);
> + return ret;
> + }
> + fprintf(stdout, "TCM_vHost ABI version: %d\n", abi_version);
> +
> + memset(&backend, 0, sizeof(backend));
> + pstrcpy(backend.vhost_wwpn, sizeof(backend.vhost_wwpn), vs->wwpn);
> + backend.vhost_tpgt = vs->tpgt;
> + ret = ioctl(vs->dev.control, VHOST_SCSI_SET_ENDPOINT, &backend);
> + if (ret < 0) {
> + ret = -errno;
> + vhost_dev_stop(&vs->dev, vdev);
> + return ret;
> + }
> +
> + return 0;
> +}
> +
> +void vhost_scsi_stop(VHostSCSI *vs, VirtIODevice *vdev)
> +{
> + int ret;
> + struct vhost_scsi_target backend;
> +
> + memset(&backend, 0, sizeof(backend));
> + pstrcpy(backend.vhost_wwpn, sizeof(backend.vhost_wwpn), vs->wwpn);
> + backend.vhost_tpgt = vs->tpgt;
> + ret = ioctl(vs->dev.control, VHOST_SCSI_CLEAR_ENDPOINT, &backend);
> + if (ret < 0) {
> + error_report("vhost-scsi: Failed to clear endpoint\n");
> + }
> +
> + vhost_dev_stop(&vs->dev, vdev);
> +}
> +
> +static VHostSCSI *vhost_scsi_add(const char *id, const char *wwpn,
> + uint16_t tpgt, const char *vhostfd_str)
> +{
> + VHostSCSI *vs;
> + int ret;
> +
> + vs = g_malloc0(sizeof(*vs));
> + if (!vs) {
> + error_report("vhost-scsi: unable to allocate *vs\n");
> + return NULL;
> + }
> + vs->vhostfd = -1;
> +
> + if (vhostfd_str) {
> + vs->vhostfd = monitor_handle_fd_param(cur_mon, vhostfd_str);
> + if (vs->vhostfd == -1) {
> + error_report("vhost-scsi: unable to parse vs->vhostfd\n");
> + return NULL;
> + }
> + }
> + /* TODO set up vhost-scsi device and bind to tcm_vhost/$wwpm/tpgt_$tpgt */
> + ret = vhost_dev_init(&vs->dev, vs->vhostfd, "/dev/vhost-scsi", false);
> + if (ret < 0) {
> + error_report("vhost-scsi: vhost initialization failed: %s\n",
> + strerror(-ret));
> + return NULL;
> + }
> + vs->dev.backend_features = 0;
> + vs->dev.acked_features = 0;
> +
> + vs->id = g_strdup(id);
> + vs->wwpn = g_strdup(wwpn);
> + vs->tpgt = tpgt;
> + QLIST_INSERT_HEAD(&vhost_scsi_list, vs, list);
> +
> + return vs;
> +}
> +
> +VHostSCSI *vhost_scsi_add_opts(QemuOpts *opts)
> +{
> + const char *id;
> + const char *wwpn, *vhostfd;
> + uint64_t tpgt;
> +
> + id = qemu_opts_id(opts);
> + if (!id) {
> + error_report("vhost-scsi: no id specified\n");
> + return NULL;
> + }
> + if (find_vhost_scsi(id)) {
> + error_report("duplicate vhost-scsi: \"%s\"\n", id);
> + return NULL;
> + }
> +
> + wwpn = qemu_opt_get(opts, "wwpn");
> + if (!wwpn) {
> + error_report("vhost-scsi: \"%s\" missing wwpn\n", id);
> + return NULL;
> + }
> +
> + tpgt = qemu_opt_get_number(opts, "tpgt", UINT64_MAX);
> + if (tpgt > UINT16_MAX) {
> + error_report("vhost-scsi: \"%s\" needs a 16-bit tpgt\n", id);
> + return NULL;
> + }
> + vhostfd = qemu_opt_get(opts, "vhostfd");
> +
> + return vhost_scsi_add(id, wwpn, tpgt, vhostfd);
> +}
> diff --git a/hw/vhost-scsi.h b/hw/vhost-scsi.h
> new file mode 100644
> index 0000000..68de51a
> --- /dev/null
> +++ b/hw/vhost-scsi.h
> @@ -0,0 +1,62 @@
> +/*
> + * vhost_scsi host device
> + *
> + * Copyright IBM, Corp. 2011
> + *
> + * Authors:
> + * Stefan Hajnoczi <stefanha at linux.vnet.ibm.com>
> + *
> + * 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.
> + *
> + */
> +
> +#ifndef VHOST_SCSI_H
> +#define VHOST_SCSI_H
> +
> +#include "qemu-common.h"
> +#include "qemu-option.h"
> +#include "qdev.h"
> +
> +/*
> + * Used by QEMU userspace to ensure a consistent vhost-scsi ABI.
> + *
> + * ABI Rev 0: July 2012 version starting point for v3.6-rc merge candidate +
> + * RFC-v2 vhost-scsi userspace. Add GET_ABI_VERSION ioctl usage
> + */
> +
> +#define VHOST_SCSI_ABI_VERSION 0
> +
> +/* TODO #include <linux/vhost.h> properly */
> +/* For VHOST_SCSI_SET_ENDPOINT/VHOST_SCSI_CLEAR_ENDPOINT ioctl */
> +struct vhost_scsi_target {
> + int abi_version;
> + char vhost_wwpn[224];
> + unsigned short vhost_tpgt;
> + unsigned short reserved;
> +};
> +
> +enum vhost_scsi_vq_list {
> + VHOST_SCSI_VQ_CTL = 0,
> + VHOST_SCSI_VQ_EVT = 1,
> + VHOST_SCSI_VQ_IO = 2,
> + VHOST_SCSI_VQ_NUM = 3,
> +};
> +
> +#define VHOST_VIRTIO 0xAF
> +#define VHOST_SCSI_SET_ENDPOINT _IOW(VHOST_VIRTIO, 0x40, struct vhost_scsi_target)
> +#define VHOST_SCSI_CLEAR_ENDPOINT _IOW(VHOST_VIRTIO, 0x41, struct vhost_scsi_target)
> +#define VHOST_SCSI_GET_ABI_VERSION _IOW(VHOST_VIRTIO, 0x42, int)
> +
> +extern PropertyInfo qdev_prop_vhost_scsi;
> +
> +#define DEFINE_PROP_VHOST_SCSI(_n, _s, _f) \
> + DEFINE_PROP(_n, _s, _f, qdev_prop_vhost_scsi, VHostSCSI*)
> +
> +VHostSCSI *find_vhost_scsi(const char *id);
> +const char *vhost_scsi_get_id(VHostSCSI *vs);
> +VHostSCSI *vhost_scsi_add_opts(QemuOpts *opts);
> +int vhost_scsi_start(VHostSCSI *vs, VirtIODevice *vdev);
> +void vhost_scsi_stop(VHostSCSI *vs, VirtIODevice *vdev);
> +
> +#endif
> diff --git a/qemu-common.h b/qemu-common.h
> index f9deca6..ec36002 100644
> --- a/qemu-common.h
> +++ b/qemu-common.h
> @@ -280,6 +280,7 @@ typedef struct EventNotifier EventNotifier;
> typedef struct VirtIODevice VirtIODevice;
> typedef struct QEMUSGList QEMUSGList;
> typedef struct SHPCDevice SHPCDevice;
> +typedef struct VHostSCSI VHostSCSI;
>
> typedef uint64_t pcibus_t;
>
> diff --git a/qemu-config.c b/qemu-config.c
> index 5c3296b..2d4884c 100644
> --- a/qemu-config.c
> +++ b/qemu-config.c
> @@ -626,6 +626,24 @@ QemuOptsList qemu_boot_opts = {
> },
> };
>
> +QemuOptsList qemu_vhost_scsi_opts = {
> + .name = "vhost-scsi",
> + .head = QTAILQ_HEAD_INITIALIZER(qemu_vhost_scsi_opts.head),
> + .desc = {
> + {
> + .name = "wwpn",
> + .type = QEMU_OPT_STRING,
> + }, {
> + .name = "tpgt",
> + .type = QEMU_OPT_NUMBER,
> + }, {
> + .name = "vhostfd",
> + .type = QEMU_OPT_STRING,
> + },
> + { /* end of list */ }
> + },
> +};
> +
> static QemuOptsList *vm_config_groups[32] = {
> &qemu_drive_opts,
> &qemu_chardev_opts,
> @@ -641,6 +659,7 @@ static QemuOptsList *vm_config_groups[32] = {
> &qemu_machine_opts,
> &qemu_boot_opts,
> &qemu_iscsi_opts,
> + &qemu_vhost_scsi_opts,
> NULL,
> };
>
> diff --git a/qemu-options.hx b/qemu-options.hx
> index 47cb5bd..4e7a03c 100644
> --- a/qemu-options.hx
> +++ b/qemu-options.hx
> @@ -565,6 +565,10 @@ possible drivers and properties, use @code{-device ?} and
> ETEXI
>
> DEFHEADING()
> +DEF("vhost-scsi", HAS_ARG, QEMU_OPTION_vhost_scsi,
> + "-vhost-scsi wwpn=string0,tpgt=number0\n"
> + " add vhost-scsi device\n",
> + QEMU_ARCH_ALL)
>
> DEFHEADING(File system options:)
>
> diff --git a/vl.c b/vl.c
> index 91076f0..61c8284 100644
> --- a/vl.c
> +++ b/vl.c
> @@ -144,6 +144,7 @@ int main(int argc, char **argv)
> #include "qemu-options.h"
> #include "qmp-commands.h"
> #include "main-loop.h"
> +#include "hw/vhost-scsi.h"
> #ifdef CONFIG_VIRTFS
> #include "fsdev/qemu-fsdev.h"
> #endif
> @@ -1858,6 +1859,14 @@ static int fsdev_init_func(QemuOpts *opts, void *opaque)
> }
> #endif
>
> +static int vhost_scsi_init_func(QemuOpts *opts, void *opaque)
> +{
> + if (!vhost_scsi_add_opts(opts)) {
> + return -1;
> + }
> + return 0;
> +}
> +
> static int mon_init_func(QemuOpts *opts, void *opaque)
> {
> CharDriverState *chr;
> @@ -2617,6 +2626,11 @@ int main(int argc, char **argv, char **envp)
> }
> break;
> #endif
> + case QEMU_OPTION_vhost_scsi:
> + if (!qemu_opts_parse(qemu_find_opts("vhost-scsi"), optarg, 0)) {
> + exit(1);
> + }
> + break;
> #ifdef CONFIG_SLIRP
> case QEMU_OPTION_tftp:
> legacy_tftp_prefix = optarg;
> @@ -3337,6 +3351,10 @@ int main(int argc, char **argv, char **envp)
> exit(1);
> }
> #endif
> + if (qemu_opts_foreach(qemu_find_opts("vhost-scsi"),
> + vhost_scsi_init_func, NULL, 1)) {
> + exit(1);
> + }
>
> os_daemonize();
>
> --
> 1.7.2.5
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