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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH v4 26/29] tools/libx{c, l}: Introduce restore_callbacks.checkpoint()
And call it when a checkpoint record is found in the libxc stream.
Some parts of this patch have been based on patches from the COLO
series.
Signed-off-by: Wen Congyang <wency@xxxxxxxxxxxxxx>
Signed-off-by: Yang Hongyang <yanghy@xxxxxxxxxxxxxx>
Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
Acked-by: Ian Campbell <Ian.Campbell@xxxxxxxxxx>
CC: Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>
CC: Wei Liu <wei.liu2@xxxxxxxxxx>
---
v3: Named constants for the API
v2: Borrow sufficient fragments from several COLO patches to get
BROKEN_CHANNEL and checkpoint failover to function.
---
tools/libxc/include/xenguest.h | 7 +++++
tools/libxc/xc_sr_common.h | 7 +++--
tools/libxc/xc_sr_restore.c | 53 ++++++++++++++++++++++++++----------
tools/libxl/libxl_save_msgs_gen.pl | 2 +-
4 files changed, 51 insertions(+), 18 deletions(-)
diff --git a/tools/libxc/include/xenguest.h b/tools/libxc/include/xenguest.h
index 7581263..e95af54 100644
--- a/tools/libxc/include/xenguest.h
+++ b/tools/libxc/include/xenguest.h
@@ -102,6 +102,13 @@ struct restore_callbacks {
int (*toolstack_restore)(uint32_t domid, const uint8_t *buf,
uint32_t size, void* data);
+ /* A checkpoint record has been found in the stream.
+ * returns: */
+#define XGR_CHECKPOINT_ERROR 0 /* Terminate processing */
+#define XGR_CHECKPOINT_SUCCESS 1 /* Continue reading more data from the
stream */
+#define XGR_CHECKPOINT_FAILOVER 2 /* Failover and resume VM */
+ int (*checkpoint)(void* data);
+
/* to be provided as the last argument to each callback function */
void* data;
};
diff --git a/tools/libxc/xc_sr_common.h b/tools/libxc/xc_sr_common.h
index 08c66db..1f4d4e4 100644
--- a/tools/libxc/xc_sr_common.h
+++ b/tools/libxc/xc_sr_common.h
@@ -130,10 +130,13 @@ struct xc_sr_restore_ops
* Process an individual record from the stream. The caller shall take
* care of processing common records (e.g. END, PAGE_DATA).
*
- * @return 0 for success, -1 for failure, or the sentinel value
- * RECORD_NOT_PROCESSED.
+ * @return 0 for success, -1 for failure, or the following sentinels:
+ * - RECORD_NOT_PROCESSED
+ * - BROKEN_CHANNEL: under Remus/COLO, this means master may be dead, and
+ * a failover is needed.
*/
#define RECORD_NOT_PROCESSED 1
+#define BROKEN_CHANNEL 2
int (*process_record)(struct xc_sr_context *ctx, struct xc_sr_record *rec);
/**
diff --git a/tools/libxc/xc_sr_restore.c b/tools/libxc/xc_sr_restore.c
index 9e27dba..18ba411 100644
--- a/tools/libxc/xc_sr_restore.c
+++ b/tools/libxc/xc_sr_restore.c
@@ -1,5 +1,7 @@
#include <arpa/inet.h>
+#include <assert.h>
+
#include "xc_sr_common.h"
/*
@@ -472,7 +474,7 @@ static int handle_page_data(struct xc_sr_context *ctx,
struct xc_sr_record *rec)
static int handle_checkpoint(struct xc_sr_context *ctx)
{
xc_interface *xch = ctx->xch;
- int rc = 0;
+ int rc = 0, ret;
unsigned i;
if ( !ctx->restore.checkpointed )
@@ -482,6 +484,21 @@ static int handle_checkpoint(struct xc_sr_context *ctx)
goto err;
}
+ ret = ctx->restore.callbacks->checkpoint(ctx->restore.callbacks->data);
+ switch ( ret )
+ {
+ case XGR_CHECKPOINT_SUCCESS:
+ break;
+
+ case XGR_CHECKPOINT_FAILOVER:
+ rc = BROKEN_CHANNEL;
+ goto err;
+
+ default: /* Other fatal error */
+ rc = -1;
+ goto err;
+ }
+
if ( ctx->restore.buffer_all_records )
{
IPRINTF("All records buffered");
@@ -560,19 +577,6 @@ static int process_record(struct xc_sr_context *ctx,
struct xc_sr_record *rec)
free(rec->data);
rec->data = NULL;
- if ( rc == RECORD_NOT_PROCESSED )
- {
- if ( rec->type & REC_TYPE_OPTIONAL )
- DPRINTF("Ignoring optional record %#x (%s)",
- rec->type, rec_type_to_str(rec->type));
- else
- {
- ERROR("Mandatory record %#x (%s) not handled",
- rec->type, rec_type_to_str(rec->type));
- rc = -1;
- }
- }
-
return rc;
}
@@ -678,7 +682,22 @@ static int restore(struct xc_sr_context *ctx)
else
{
rc = process_record(ctx, &rec);
- if ( rc )
+ if ( rc == RECORD_NOT_PROCESSED )
+ {
+ if ( rec.type & REC_TYPE_OPTIONAL )
+ DPRINTF("Ignoring optional record %#x (%s)",
+ rec.type, rec_type_to_str(rec.type));
+ else
+ {
+ ERROR("Mandatory record %#x (%s) not handled",
+ rec.type, rec_type_to_str(rec.type));
+ rc = -1;
+ goto err;
+ }
+ }
+ else if ( rc == BROKEN_CHANNEL )
+ goto remus_failover;
+ else if ( rc )
goto err;
}
@@ -735,6 +754,10 @@ int xc_domain_restore2(xc_interface *xch, int io_fd,
uint32_t dom,
ctx.restore.checkpointed = checkpointed_stream;
ctx.restore.callbacks = callbacks;
+ /* Sanity checks for callbacks. */
+ if ( checkpointed_stream )
+ assert(callbacks->checkpoint);
+
IPRINTF("In experimental %s", __func__);
DPRINTF("fd %d, dom %u, hvm %u, pae %u, superpages %d"
", checkpointed_stream %d", io_fd, dom, hvm, pae,
diff --git a/tools/libxl/libxl_save_msgs_gen.pl
b/tools/libxl/libxl_save_msgs_gen.pl
index 6b4b65e..825d5cc 100755
--- a/tools/libxl/libxl_save_msgs_gen.pl
+++ b/tools/libxl/libxl_save_msgs_gen.pl
@@ -25,7 +25,7 @@ our @msgs = (
'unsigned long', 'total'] ],
[ 3, 'scxA', "suspend", [] ],
[ 4, 'scxA', "postcopy", [] ],
- [ 5, 'scxA', "checkpoint", [] ],
+ [ 5, 'srcxA', "checkpoint", [] ],
[ 6, 'scxA', "switch_qemu_logdirty", [qw(int domid
unsigned enable)] ],
# toolstack_save done entirely `by hand'
--
1.7.10.4
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