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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH v16 2/7] remus: introduce remus device
introduce remus device, an abstract layer of remus devices(nic, disk,
etc).It provides the following APIs for libxl:
>libxl__remus_devices_setup
setup remus devices, like attach qdisc, enable disk buffering, etc
>libxl__remus_devices_teardown
teardown devices
>libxl__remus_devices_postsuspend
>libxl__remus_devices_preresume
>libxl__remus_devices_commit
above three are for checkpoint.
through remus device layer, the remus execution flow will be like
this:
xl remus -> remus device setup
|-> remus checkpoint(postsuspend, preresume, commit)
...
|-> remus device teardown, failover or abort
the remus device layer provides an interface
libxl__remus_device_subkind_ops
which a remus device must implement. the whole remus structure:
|remus|
|
|remus device|
|
|nic| |drbd disks| |qemu disks| ...
a device(nic, drbd disks, qemu disks, etc) must implement
libxl__remus_device_subkind_ops to support remus.
Signed-off-by: Yang Hongyang <yanghy@xxxxxxxxxxxxxx>
Signed-off-by: Wen Congyang <wency@xxxxxxxxxxxxxx>
Signed-off-by: Lai Jiangshan <laijs@xxxxxxxxxxxxxx>
---
tools/libxl/Makefile | 2 +
tools/libxl/libxl.c | 52 +++++-
tools/libxl/libxl.h | 6 +
tools/libxl/libxl_dom.c | 155 ++++++++++++++++--
tools/libxl/libxl_internal.h | 171 ++++++++++++++++++++
tools/libxl/libxl_remus_device.c | 339 +++++++++++++++++++++++++++++++++++++++
tools/libxl/libxl_types.idl | 2 +
7 files changed, 706 insertions(+), 21 deletions(-)
create mode 100644 tools/libxl/libxl_remus_device.c
diff --git a/tools/libxl/Makefile b/tools/libxl/Makefile
index eb63510..202f1bb 100644
--- a/tools/libxl/Makefile
+++ b/tools/libxl/Makefile
@@ -56,6 +56,8 @@ else
LIBXL_OBJS-y += libxl_nonetbuffer.o
endif
+LIBXL_OBJS-y += libxl_remus_device.o
+
LIBXL_OBJS-$(CONFIG_X86) += libxl_cpuid.o libxl_x86.o
LIBXL_OBJS-$(CONFIG_ARM) += libxl_nocpuid.o libxl_arm.o
diff --git a/tools/libxl/libxl.c b/tools/libxl/libxl.c
index a9205d1..95d9953 100644
--- a/tools/libxl/libxl.c
+++ b/tools/libxl/libxl.c
@@ -781,9 +781,17 @@ out:
return ptr;
}
+static void libxl__remus_setup_done(libxl__egc *egc,
+ libxl__remus_device_state *rds, int rc);
+static void libxl__remus_setup_failed(libxl__egc *egc,
+ libxl__remus_device_state *rds, int rc);
static void remus_failover_cb(libxl__egc *egc,
libxl__domain_suspend_state *dss, int rc);
+static const libxl__remus_device_subkind_ops *remus_ops[] = {
+ NULL,
+};
+
/* TODO: Explicit Checkpoint acknowledgements via recv_fd. */
int libxl_domain_remus_start(libxl_ctx *ctx, libxl_domain_remus_info *info,
uint32_t domid, int send_fd, int recv_fd,
@@ -812,16 +820,52 @@ int libxl_domain_remus_start(libxl_ctx *ctx,
libxl_domain_remus_info *info,
assert(info);
- /* TBD: Remus setup - i.e. attach qdisc, enable disk buffering, etc */
+ /* Convenience aliases */
+ libxl__remus_device_state *const rds = &dss->rds;
+ rds->ao = ao;
+ rds->egc = egc;
+ rds->domid = domid;
+ rds->callback = libxl__remus_setup_done;
+ rds->ops = remus_ops;
/* Point of no return */
- libxl__domain_suspend(egc, dss);
+ libxl__remus_devices_setup(egc, rds);
return AO_INPROGRESS;
out:
return AO_ABORT(rc);
}
+static void libxl__remus_setup_done(libxl__egc *egc,
+ libxl__remus_device_state *rds, int rc)
+{
+ libxl__domain_suspend_state *dss = CONTAINER_OF(rds, *dss, rds);
+ STATE_AO_GC(dss->ao);
+
+ if (!rc) {
+ libxl__domain_suspend(egc, dss);
+ return;
+ }
+
+ LOG(ERROR, "Remus: failed to setup device for guest with domid %u, rc %d",
+ dss->domid, rc);
+ rds->callback = libxl__remus_setup_failed;
+ libxl__remus_devices_teardown(egc, rds);
+}
+
+static void libxl__remus_setup_failed(libxl__egc *egc,
+ libxl__remus_device_state *rds, int rc)
+{
+ libxl__domain_suspend_state *dss = CONTAINER_OF(rds, *dss, rds);
+ STATE_AO_GC(dss->ao);
+
+ if (rc)
+ LOG(ERROR, "Remus: failed to teardown device after setup failed"
+ " for guest with domid %u, rc %d", dss->domid, rc);
+
+ dss->callback(egc, dss, rc);
+}
+
static void remus_failover_cb(libxl__egc *egc,
libxl__domain_suspend_state *dss, int rc)
{
@@ -831,10 +875,6 @@ static void remus_failover_cb(libxl__egc *egc,
* backup died or some network error occurred preventing us
* from sending checkpoints.
*/
-
- /* TBD: Remus cleanup - i.e. detach qdisc, release other
- * resources.
- */
libxl__ao_complete(egc, ao, rc);
}
diff --git a/tools/libxl/libxl.h b/tools/libxl/libxl.h
index 5ae6532..81905b3 100644
--- a/tools/libxl/libxl.h
+++ b/tools/libxl/libxl.h
@@ -579,6 +579,12 @@ typedef struct libxl__ctx libxl_ctx;
*/
#define LIBXL_HAVE_CPUPOOL_NAME 1
+/*
+ * LIBXL_HAVE_REMUS
+ * If this is defined, then libxl supports remus.
+ */
+#define LIBXL_HAVE_REMUS 1
+
typedef uint8_t libxl_mac[6];
#define LIBXL_MAC_FMT "%02hhx:%02hhx:%02hhx:%02hhx:%02hhx:%02hhx"
#define LIBXL_MAC_FMTLEN ((2*6)+5) /* 6 hex bytes plus 5 colons */
diff --git a/tools/libxl/libxl_dom.c b/tools/libxl/libxl_dom.c
index 83eb29a..91f0bf1 100644
--- a/tools/libxl/libxl_dom.c
+++ b/tools/libxl/libxl_dom.c
@@ -798,8 +798,6 @@ static void domain_suspend_done(libxl__egc *egc,
libxl__domain_suspend_state *dss, int rc);
static void domain_suspend_callback_common_done(libxl__egc *egc,
libxl__domain_suspend_state *dss, int ok);
-static void remus_domain_suspend_callback_common_done(libxl__egc *egc,
- libxl__domain_suspend_state *dss, int ok);
/*----- complicated callback, called by xc_domain_save -----*/
@@ -1461,6 +1459,14 @@ static void
domain_suspend_callback_common_done(libxl__egc *egc,
}
/*----- remus callbacks -----*/
+static void remus_domain_suspend_callback_common_done(libxl__egc *egc,
+ libxl__domain_suspend_state *dss, int ok);
+static void remus_device_postsuspend_cb(libxl__egc *egc,
+ libxl__remus_device_state *rds,
+ int rc);
+static void remus_device_preresume_cb(libxl__egc *egc,
+ libxl__remus_device_state *rds,
+ int rc);
static void libxl__remus_domain_suspend_callback(void *data)
{
@@ -1475,32 +1481,67 @@ static void libxl__remus_domain_suspend_callback(void
*data)
static void remus_domain_suspend_callback_common_done(libxl__egc *egc,
libxl__domain_suspend_state *dss, int ok)
{
- /* REMUS TODO: Issue disk and network checkpoint reqs. */
+ if (!ok)
+ goto out;
+
+ libxl__remus_device_state *const rds = &dss->rds;
+ rds->callback = remus_device_postsuspend_cb;
+ libxl__remus_devices_postsuspend(egc, rds);
+ return;
+
+out:
libxl__xc_domain_saverestore_async_callback_done(egc, &dss->shs, ok);
}
-static void libxl__remus_domain_resume_callback(void *data)
+static void remus_device_postsuspend_cb(libxl__egc *egc,
+ libxl__remus_device_state *rds,
+ int rc)
{
int ok = 0;
+ libxl__domain_suspend_state *dss = CONTAINER_OF(rds, *dss, rds);
+
+ if (!rc)
+ ok = 1;
+ libxl__xc_domain_saverestore_async_callback_done(egc, &dss->shs, ok);
+}
+
+static void libxl__remus_domain_resume_callback(void *data)
+{
libxl__save_helper_state *shs = data;
libxl__egc *egc = shs->egc;
libxl__domain_suspend_state *dss = CONTAINER_OF(shs, *dss, shs);
STATE_AO_GC(dss->ao);
- /* Resumes the domain and the device model */
- if (libxl__domain_resume(gc, dss->domid, /* Fast Suspend */1))
- goto out;
+ libxl__remus_device_state *const rds = &dss->rds;
+ rds->callback = remus_device_preresume_cb;
+ libxl__remus_devices_preresume(egc, rds);
+}
- /* REMUS TODO: Deal with disk. Start a new network output buffer */
- ok = 1;
-out:
- libxl__xc_domain_saverestore_async_callback_done(egc, shs, ok);
+static void remus_device_preresume_cb(libxl__egc *egc,
+ libxl__remus_device_state *rds,
+ int rc)
+{
+ int ok = 0;
+ libxl__domain_suspend_state *dss = CONTAINER_OF(rds, *dss, rds);
+ STATE_AO_GC(dss->ao);
+
+ if (!rc) {
+ /* Resumes the domain and the device model */
+ if (!libxl__domain_resume(gc, dss->domid, /* Fast Suspend */1))
+ ok = 1;
+ }
+ libxl__xc_domain_saverestore_async_callback_done(egc, &dss->shs, ok);
}
/*----- remus asynchronous checkpoint callback -----*/
static void remus_checkpoint_dm_saved(libxl__egc *egc,
libxl__domain_suspend_state *dss, int
rc);
+static void remus_device_commit_cb(libxl__egc *egc,
+ libxl__remus_device_state *rds,
+ int rc);
+static void remus_next_checkpoint(libxl__egc *egc, libxl__ev_time *ev,
+ const struct timeval *requested_abs);
static void libxl__remus_domain_checkpoint_callback(void *data)
{
@@ -1520,10 +1561,63 @@ static void
libxl__remus_domain_checkpoint_callback(void *data)
static void remus_checkpoint_dm_saved(libxl__egc *egc,
libxl__domain_suspend_state *dss, int rc)
{
- /* REMUS TODO: Wait for disk and memory ack, release network buffer */
- /* REMUS TODO: make this asynchronous */
- assert(!rc); /* REMUS TODO handle this error properly */
- usleep(dss->interval * 1000);
+ /* Convenience aliases */
+ libxl__remus_device_state *const rds = &dss->rds;
+
+ STATE_AO_GC(dss->ao);
+
+ if (rc) {
+ LOG(ERROR, "Failed to save device model. Terminating Remus..");
+ goto out;
+ }
+
+ rds->callback = remus_device_commit_cb;
+ libxl__remus_devices_commit(egc, rds);
+
+ return;
+
+out:
+ libxl__xc_domain_saverestore_async_callback_done(egc, &dss->shs, 0);
+}
+
+static void remus_device_commit_cb(libxl__egc *egc,
+ libxl__remus_device_state *rds,
+ int rc)
+{
+ libxl__domain_suspend_state *dss = CONTAINER_OF(rds, *dss, rds);
+
+ STATE_AO_GC(dss->ao);
+
+ if (rc) {
+ LOG(ERROR, "Failed to do device commit op."
+ " Terminating Remus..");
+ goto out;
+ } else {
+ /* Set checkpoint interval timeout */
+ rc = libxl__ev_time_register_rel(gc, &dss->checkpoint_timeout,
+ remus_next_checkpoint,
+ dss->interval);
+ if (rc) {
+ LOG(ERROR, "unable to register timeout for next epoch."
+ " Terminating Remus..");
+ goto out;
+ }
+ }
+ return;
+
+out:
+ libxl__xc_domain_saverestore_async_callback_done(egc, &dss->shs, 0);
+}
+
+static void remus_next_checkpoint(libxl__egc *egc, libxl__ev_time *ev,
+ const struct timeval *requested_abs)
+{
+ libxl__domain_suspend_state *dss =
+ CONTAINER_OF(ev, *dss, checkpoint_timeout);
+
+ STATE_AO_GC(dss->ao);
+
+ libxl__ev_time_deregister(gc, &dss->checkpoint_timeout);
libxl__xc_domain_saverestore_async_callback_done(egc, &dss->shs, 1);
}
@@ -1738,6 +1832,9 @@ static void save_device_model_datacopier_done(libxl__egc
*egc,
dss->save_dm_callback(egc, dss, our_rc);
}
+static void libxl__remus_teardown_done(libxl__egc *egc,
+ libxl__remus_device_state *rds,
+ int rc);
static void domain_suspend_done(libxl__egc *egc,
libxl__domain_suspend_state *dss, int rc)
{
@@ -1752,6 +1849,34 @@ static void domain_suspend_done(libxl__egc *egc,
xc_suspend_evtchn_release(CTX->xch, CTX->xce, domid,
dss->guest_evtchn.port, &dss->guest_evtchn_lockfd);
+ if (dss->remus) {
+ /*
+ * With Remus, if we reach this point, it means either
+ * backup died or some network error occurred preventing us
+ * from sending checkpoints. Teardown the network buffers and
+ * release netlink resources. This is an async op.
+ */
+ LOGE(WARN, "Remus: Domain suspend terminated with rc %d,"
+ " teardown Remus devices...", rc);
+ dss->rds.callback = libxl__remus_teardown_done;
+ libxl__remus_devices_teardown(egc, &dss->rds);
+ return;
+ }
+
+ dss->callback(egc, dss, rc);
+}
+
+static void libxl__remus_teardown_done(libxl__egc *egc,
+ libxl__remus_device_state *rds,
+ int rc)
+{
+ libxl__domain_suspend_state *dss = CONTAINER_OF(rds, *dss, rds);
+ STATE_AO_GC(dss->ao);
+
+ if (rc)
+ LOG(ERROR, "Remus: failed to teardown device for guest with domid %u,"
+ " rc %d", dss->domid, rc);
+
dss->callback(egc, dss, rc);
}
diff --git a/tools/libxl/libxl_internal.h b/tools/libxl/libxl_internal.h
index db10efb..1eba7af 100644
--- a/tools/libxl/libxl_internal.h
+++ b/tools/libxl/libxl_internal.h
@@ -2470,6 +2470,175 @@ typedef struct libxl__save_helper_state {
* marshalling and xc callback functions */
} libxl__save_helper_state;
+/*----- remus device related state structure -----*/
+/* remus device is an abstract layer of remus devices(nic, disk,
+ * etc).It provides the following APIs for libxl:
+ * >libxl__remus_devices_setup
+ * setup remus devices, like attach qdisc, enable disk buffering, etc
+ * >libxl__remus_devices_teardown
+ * teardown devices
+ * >libxl__remus_devices_postsuspend
+ * >libxl__remus_devices_preresume
+ * >libxl__remus_devices_commit
+ * above three are for checkpoint.
+ * through remus device layer, the remus execution flow will be like
+ * this:
+ * xl remus -> remus device setup
+ * |-> remus checkpoint(postsuspend, preresume, commit)
+ * ...
+ * |-> remus device teardown, failover or abort
+ * the remus device layer provides an interface
+ * libxl__remus_device_subkind_ops
+ * which a remus device must implement. the whole remus structure:
+ * |remus|
+ * |
+ * |remus device|
+ * |
+ * |nic| |drbd disks| |qemu disks| ...
+ * a device(nic, drbd disks, qemu disks, etc) must implement
+ * libxl__remus_device_subkind_ops to support remus.
+ */
+
+typedef enum libxl__remus_device_kind {
+ LIBXL__REMUS_DEVICE_NIC,
+ LIBXL__REMUS_DEVICE_DISK,
+} libxl__remus_device_kind;
+
+typedef struct libxl__remus_device libxl__remus_device;
+typedef struct libxl__remus_device_state libxl__remus_device_state;
+typedef struct libxl__remus_device_subkind_ops libxl__remus_device_subkind_ops;
+
+struct libxl__remus_device_subkind_ops {
+ /* the device kind this ops belongs to... */
+ libxl__remus_device_kind kind;
+
+ /*
+ * init() and destroy() APIs are produced by a device subkind and
+ * consumed by the main remus code, a device subkind must implement
+ * these two APIs.
+ * the APIs init/destroy device subkind's private data which stored
+ * in CTX. must implement.
+ */
+ int (*init)(libxl__remus_device_state *rds);
+ void (*destroy)(libxl__remus_device_state *rds);
+
+ /*
+ * checkpoint callbacks, these are async ops, call dev->callback
+ * when done. These function pointers may be NULL, means the op is
+ * not implemented, and it will do nothing when checkpoint.
+ * The callers of these APIs must check the function pointer first.
+ * These callbacks can be implemented synchronously, call
+ * dev->callback at last directly.
+ */
+ void (*postsuspend)(libxl__remus_device *dev);
+ void (*preresume)(libxl__remus_device *dev);
+ void (*commit)(libxl__remus_device *dev);
+
+ /*
+ * This API determines whether the subkind matchs the specific device. In
+ * the implementation, we first init all device subkind, for example, NIC,
+ * DRBD disk... Then we will find out the libxl devices, and match the
+ * device with the subkind, if the device is a drbd disk, then it will be
+ * matched with DRBD subkind, and the further ops(such as checkpoint etc.)
+ * of this device will using DRBD subkind ops. This API is mainly for
+ * disks, because we must use an external script to determine whether a
+ * libxl_disk is a DRBD disk.
+ * This function pointer may be NULL. That means this *kind* of
+ * device's ops is always matched with the *kind* of device.
+ * It's an async op and must be implemented asynchronously,
+ * call dev->callback when done.
+ */
+ void (*match)(libxl__remus_device *dev);
+
+ /*
+ * setup() and teardown() are refer to the actual remus device,
+ * a device subkind must implement these two APIs. They are async
+ * ops, and call dev->callback when done.
+ * These callbacks can be implemented synchronously, call
+ * dev->callback at last directly.
+ */
+ void (*setup)(libxl__remus_device *dev);
+ void (*teardown)(libxl__remus_device *dev);
+};
+
+typedef void libxl__remus_callback(libxl__egc *,
+ libxl__remus_device_state *, int rc);
+
+/*
+ * This structure is for remus device layer, it records remus devices
+ * that have been set up.
+ */
+struct libxl__remus_device_state {
+ /* must set by caller of libxl__remus_device_(setup|teardown) */
+ libxl__ao *ao;
+ libxl__egc *egc;
+ uint32_t domid;
+ libxl__remus_callback *callback;
+ /* the last ops must be NULL */
+ const libxl__remus_device_subkind_ops **ops;
+
+ /* private */
+ /* devices that have been set up */
+ int saved_rc;
+ libxl__remus_device **dev;
+
+ int num_nics;
+ int num_disks;
+
+ /* for counting devices that have been handled */
+ int num_devices;
+ /* for counting devices that have been set up */
+ int num_set_up;
+};
+
+typedef void libxl__remus_device_callback(libxl__egc *,
+ libxl__remus_device *,
+ int rc);
+/*
+ * This structure is init and setup by remus device abstruct layer,
+ * and pass to remus device ops
+ */
+struct libxl__remus_device {
+ /*----- shared between abstract and concrete layers -----*/
+ /* set by remus device abstruct layer */
+ /* libxl__device_* which this remus device related to */
+ const void *backend_dev;
+ libxl__remus_device_kind kind;
+
+ /*----- private for abstract layer only -----*/
+ /*
+ * we must go through all device ops until we find a matched ops
+ * for the device.
+ */
+ int ops_index;
+ const libxl__remus_device_subkind_ops *ops;
+ libxl__remus_device_callback *callback;
+ libxl__remus_device_state *rds;
+
+ /*----- private for concrete (device-specific) layer -----*/
+ /* *kind* of device's private data */
+ void *data;
+ /* for calling scripts, eg. setup|teardown|match scripts */
+ libxl__async_exec_state aes;
+ /*
+ * for async func calls, in the implementation of device ops, we
+ * may use fork to do async ops. this is owned by device-specific
+ * ops methods
+ */
+ libxl__ev_child child;
+};
+
+/* the following 5 APIs are async ops, call rds->callback when done */
+_hidden void libxl__remus_devices_setup(libxl__egc *egc,
+ libxl__remus_device_state *rds);
+_hidden void libxl__remus_devices_teardown(libxl__egc *egc,
+ libxl__remus_device_state *rds);
+_hidden void libxl__remus_devices_postsuspend(libxl__egc *egc,
+ libxl__remus_device_state *rds);
+_hidden void libxl__remus_devices_preresume(libxl__egc *egc,
+ libxl__remus_device_state *rds);
+_hidden void libxl__remus_devices_commit(libxl__egc *egc,
+ libxl__remus_device_state *rds);
_hidden int libxl__netbuffer_enabled(libxl__gc *gc);
/*----- Domain suspend (save) state structure -----*/
@@ -2510,6 +2679,8 @@ struct libxl__domain_suspend_state {
libxl__ev_xswatch guest_watch;
libxl__ev_time guest_timeout;
const char *dm_savefile;
+ libxl__remus_device_state rds;
+ libxl__ev_time checkpoint_timeout; /* used for Remus checkpoint */
int interval; /* checkpoint interval (for Remus) */
libxl__save_helper_state shs;
libxl__logdirty_switch logdirty;
diff --git a/tools/libxl/libxl_remus_device.c b/tools/libxl/libxl_remus_device.c
new file mode 100644
index 0000000..14cca79
--- /dev/null
+++ b/tools/libxl/libxl_remus_device.c
@@ -0,0 +1,339 @@
+/*
+ * Copyright (C) 2014
+ * Author: Yang Hongyang <yanghy@xxxxxxxxxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published
+ * by the Free Software Foundation; version 2.1 only. with the special
+ * exception on linking described in file LICENSE.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Lesser General Public License for more details.
+ */
+
+#include "libxl_osdeps.h" /* must come before any other headers */
+
+#include "libxl_internal.h"
+
+/*----- helper functions -----*/
+
+static int init_device_subkind(libxl__remus_device_state *rds)
+{
+ int rc;
+ const libxl__remus_device_subkind_ops **ops;
+
+ for (ops = rds->ops; *ops; ops++) {
+ rc = (*ops)->init(rds);
+ if (rc) {
+ goto out;
+ }
+ }
+
+ rc = 0;
+out:
+ return rc;
+
+}
+
+static void destroy_device_subkind(libxl__remus_device_state *rds)
+{
+ const libxl__remus_device_subkind_ops **ops;
+
+ for (ops = rds->ops; *ops; ops++)
+ (*ops)->destroy(rds);
+}
+
+static bool all_devices_handled(libxl__remus_device_state *rds)
+{
+ return rds->num_devices == (rds->num_nics + rds->num_disks);
+}
+
+/*----- setup() and teardown() -----*/
+
+/* callbacks */
+
+static void device_match_cb(libxl__egc *egc,
+ libxl__remus_device *dev,
+ int rc);
+static void device_setup_cb(libxl__egc *egc,
+ libxl__remus_device *dev,
+ int rc);
+static void device_teardown_cb(libxl__egc *egc,
+ libxl__remus_device *dev,
+ int rc);
+
+/* remus device setup and teardown */
+
+static __attribute__((unused)) void libxl__remus_device_init(libxl__egc *egc,
+ libxl__remus_device_state *rds,
+ libxl__remus_device_kind kind,
+ void *libxl_dev);
+void libxl__remus_devices_setup(libxl__egc *egc, libxl__remus_device_state
*rds)
+{
+ STATE_AO_GC(rds->ao);
+
+ if (!rds->ops[0])
+ goto out;
+
+ rds->saved_rc = init_device_subkind(rds);
+ if (rds->saved_rc)
+ goto out;
+
+ rds->num_devices = 0;
+ rds->num_nics = 0;
+ rds->num_disks = 0;
+
+ /* TBD: Remus setup - i.e. attach qdisc, enable disk buffering, etc */
+
+ if (rds->num_nics == 0 && rds->num_disks == 0)
+ goto out;
+
+ GCNEW_ARRAY(rds->dev, rds->num_nics + rds->num_disks);
+
+ /* TBD: CALL libxl__remus_device_init to init remus devices */
+
+ return;
+
+out:
+ rds->callback(egc, rds, rds->saved_rc);
+ return;
+}
+
+static __attribute__((unused)) void libxl__remus_device_init(libxl__egc *egc,
+ libxl__remus_device_state *rds,
+ libxl__remus_device_kind kind,
+ void *libxl_dev)
+{
+ libxl__remus_device *dev = NULL;
+
+ STATE_AO_GC(rds->ao);
+ GCNEW(dev);
+ dev->backend_dev = libxl_dev;
+ dev->kind = kind;
+ dev->rds = rds;
+
+ libxl__async_exec_init(&dev->aes);
+ libxl__ev_child_init(&dev->child);
+
+ /* match the ops begin */
+ dev->ops_index = 0;
+ dev->ops = rds->ops[dev->ops_index];
+ for (; dev->ops; dev->ops = rds->ops[++dev->ops_index]) {
+ if (dev->ops->kind == dev->kind) {
+ if (dev->ops->match) {
+ dev->callback = device_match_cb;
+ dev->ops->match(dev);
+ } else {
+ /*
+ * This devops do not have match() implementation.
+ * That means this *kind* of device's ops is always
+ * matched with the *kind* of device.
+ */
+ dev->callback = device_setup_cb;
+ dev->ops->setup(dev);
+ }
+ break;
+ }
+ }
+
+ if (!dev->ops) {
+ rds->num_devices++;
+ rds->saved_rc = ERROR_REMUS_DEVICE_NOT_SUPPORTED;
+ if (all_devices_handled(rds))
+ rds->callback(egc, rds, rds->saved_rc);
+ }
+}
+
+static void device_match_cb(libxl__egc *egc,
+ libxl__remus_device *dev,
+ int rc)
+{
+ libxl__remus_device_state *const rds = dev->rds;
+
+ STATE_AO_GC(rds->ao);
+
+ if (rds->saved_rc) {
+ /* there's already an error happened, we do not need to continue */
+ rds->num_devices++;
+ if (all_devices_handled(rds))
+ rds->callback(egc, rds, rds->saved_rc);
+ return;
+ }
+
+ if (rc) {
+ /* the ops does not match, try next ops */
+ dev->ops = rds->ops[++dev->ops_index];
+ if (!dev->ops || rc != ERROR_REMUS_DEVOPS_NOT_MATCH) {
+ /* the device can not be matched */
+ rds->num_devices++;
+ rds->saved_rc = ERROR_REMUS_DEVICE_NOT_SUPPORTED;
+ if (all_devices_handled(rds))
+ rds->callback(egc, rds, rds->saved_rc);
+ return;
+ }
+ for ( ; dev->ops; dev->ops = rds->ops[++dev->ops_index]) {
+ if (dev->ops->kind == dev->kind) {
+ /*
+ * we have entered match process, that means this *kind* of
+ * device's ops must have a match() implementation.
+ */
+ assert(dev->ops->match);
+ dev->ops->match(dev);
+ break;
+ }
+ }
+ } else {
+ /* the ops matched, setup the device */
+ dev->callback = device_setup_cb;
+ dev->ops->setup(dev);
+ }
+}
+
+static void device_setup_cb(libxl__egc *egc,
+ libxl__remus_device *dev,
+ int rc)
+{
+ /* Convenience aliases */
+ libxl__remus_device_state *const rds = dev->rds;
+
+ STATE_AO_GC(rds->ao);
+
+ rds->num_devices++;
+ /*
+ * the netbuf script was designed as below:
+ * 1. when setup failed, the script won't teardown the device itself.
+ * 2. the teardown op is ok to be executed many times.
+ *
+ * we add devices that have been set up to the array no matter
+ * the setup process succeed or failed because we need to ensure
+ * the device been teardown while setup failed. If any of the
+ * device setup failed, we will quit remus, but before we exit,
+ * we will teardown the devices that have been added to **dev
+ */
+ rds->dev[rds->num_set_up++] = dev;
+ /* we preserve the first error that happened */
+ if (rc && !rds->saved_rc)
+ rds->saved_rc = rc;
+
+ if (all_devices_handled(rds))
+ rds->callback(egc, rds, rds->saved_rc);
+}
+
+void libxl__remus_devices_teardown(libxl__egc *egc, libxl__remus_device_state
*rds)
+{
+ int i, num_set_up;
+ libxl__remus_device *dev;
+
+ STATE_AO_GC(rds->ao);
+
+ rds->saved_rc = 0;
+
+ if (rds->num_set_up == 0) {
+ destroy_device_subkind(rds);
+ goto out;
+ }
+
+ /* we will decrease rds->num_set_up in the teardown callback */
+ num_set_up = rds->num_set_up;
+ for (i = 0; i < num_set_up; i++) {
+ dev = rds->dev[i];
+ dev->callback = device_teardown_cb;
+ dev->ops->teardown(dev);
+ }
+
+ return;
+
+out:
+ rds->callback(egc, rds, rds->saved_rc);
+ return;
+}
+
+static void device_teardown_cb(libxl__egc *egc,
+ libxl__remus_device *dev,
+ int rc)
+{
+ libxl__remus_device_state *const rds = dev->rds;
+
+ STATE_AO_GC(rds->ao);
+
+ /* we preserve the first error that happened */
+ if (rc && !rds->saved_rc)
+ rds->saved_rc = rc;
+
+ /* ignore teardown errors to teardown as many devs as possible*/
+ rds->num_set_up--;
+
+ if (rds->num_set_up == 0) {
+ destroy_device_subkind(rds);
+ rds->callback(egc, rds, rds->saved_rc);
+ }
+}
+
+/*----- checkpointing APIs -----*/
+
+/* callbacks */
+
+static void device_checkpoint_cb(libxl__egc *egc,
+ libxl__remus_device *dev,
+ int rc);
+
+/* API implementations */
+
+#define define_remus_device_checkpoint_api(api) \
+void libxl__remus_devices_##api(libxl__egc *egc, \
+ libxl__remus_device_state *rds) \
+{ \
+ int i; \
+ libxl__remus_device *dev; \
+ \
+ STATE_AO_GC(rds->ao); \
+ \
+ rds->num_devices = 0; \
+ rds->saved_rc = 0; \
+ \
+ if (rds->num_set_up == 0) \
+ goto out; \
+ \
+ for (i = 0; i < rds->num_set_up; i++) { \
+ dev = rds->dev[i]; \
+ dev->callback = device_checkpoint_cb; \
+ if (dev->ops->api) { \
+ dev->ops->api(dev); \
+ } else { \
+ rds->num_devices++; \
+ if (rds->num_devices == rds->num_set_up) \
+ rds->callback(egc, rds, rds->saved_rc); \
+ } \
+ } \
+ \
+ return; \
+ \
+out: \
+ rds->callback(egc, rds, rds->saved_rc); \
+}
+
+define_remus_device_checkpoint_api(postsuspend);
+
+define_remus_device_checkpoint_api(preresume);
+
+define_remus_device_checkpoint_api(commit);
+
+static void device_checkpoint_cb(libxl__egc *egc,
+ libxl__remus_device *dev,
+ int rc)
+{
+ /* Convenience aliases */
+ libxl__remus_device_state *const rds = dev->rds;
+
+ STATE_AO_GC(rds->ao);
+
+ rds->num_devices++;
+
+ if (rc)
+ rds->saved_rc = ERROR_FAIL;
+
+ if (rds->num_devices == rds->num_set_up)
+ rds->callback(egc, rds, rds->saved_rc);
+}
diff --git a/tools/libxl/libxl_types.idl b/tools/libxl/libxl_types.idl
index a412f9c..61d31c1 100644
--- a/tools/libxl/libxl_types.idl
+++ b/tools/libxl/libxl_types.idl
@@ -58,6 +58,8 @@ libxl_error = Enumeration("error", [
(-12, "OSEVENT_REG_FAIL"),
(-13, "BUFFERFULL"),
(-14, "UNKNOWN_CHILD"),
+ (-15, "REMUS_DEVOPS_NOT_MATCH"),
+ (-16, "REMUS_DEVICE_NOT_SUPPORTED"),
], value_namespace = "")
libxl_domain_type = Enumeration("domain_type", [
--
1.9.1
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