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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-changelog] [xen staging] libxc/migration: Rationalise the 'checkpointed' field to 'stream_type'
commit 86cf92f5053339ca5f3c71be858f3d55dd05a950
Author: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
AuthorDate: Fri Dec 20 16:34:16 2019 +0000
Commit: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
CommitDate: Wed Jan 15 15:22:28 2020 +0000
libxc/migration: Rationalise the 'checkpointed' field to 'stream_type'
Originally, 'checkpointed' was a boolean signalling the difference between a
plain and a Remus stream. COLO was added later, but several bits of code
retained boolean-style logic. While correct, it is confusing to follow.
Additionally, XC_MIG_STREAM_NONE means "no checkpoints" but reads as "no
stream".
Consolidate all the logic on the term 'stream_type', and rename STREAM_NONE
to STREAM_PLAIN. Re-position the stream_type variable so it isn't
duplicated in both the save and restore unions.
No functional change.
Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
Acked-by: Ian Jackson <ian.jackson@xxxxxxxxxxxxx>
---
tools/libxc/include/xenguest.h | 21 +++++++--------
tools/libxc/xc_nomigrate.c | 4 +--
tools/libxc/xc_sr_common.h | 9 +++----
tools/libxc/xc_sr_restore.c | 43 +++++++++++++++++--------------
tools/libxc/xc_sr_save.c | 57 ++++++++++++++++++++++-------------------
tools/libxl/libxl_save_helper.c | 4 +--
6 files changed, 73 insertions(+), 65 deletions(-)
diff --git a/tools/libxc/include/xenguest.h b/tools/libxc/include/xenguest.h
index 1c358a0577..237603373c 100644
--- a/tools/libxc/include/xenguest.h
+++ b/tools/libxc/include/xenguest.h
@@ -112,11 +112,12 @@ struct save_callbacks {
void* data;
};
+/* Type of stream. Plain, or using a continuous replication protocol? */
typedef enum {
- XC_MIG_STREAM_NONE, /* plain stream */
- XC_MIG_STREAM_REMUS,
- XC_MIG_STREAM_COLO,
-} xc_migration_stream_t;
+ XC_STREAM_PLAIN,
+ XC_STREAM_REMUS,
+ XC_STREAM_COLO,
+} xc_stream_type_t;
/**
* This function will save a running domain.
@@ -125,15 +126,15 @@ typedef enum {
* @param io_fd the file descriptor to save a domain to
* @param dom the id of the domain
* @param flags XCFLAGS_xxx
- * @param stream_type XC_MIG_STREAM_NONE if the far end of the stream
+ * @param stream_type XC_STREAM_PLAIN if the far end of the stream
* doesn't use checkpointing
- * @param recv_fd Only used for XC_MIG_STREAM_COLO. Contains backchannel from
+ * @param recv_fd Only used for XC_STREAM_COLO. Contains backchannel from
* the destination side.
* @return 0 on success, -1 on failure
*/
int xc_domain_save(xc_interface *xch, int io_fd, uint32_t dom,
uint32_t flags, struct save_callbacks *callbacks,
- xc_migration_stream_t stream_type, int recv_fd);
+ xc_stream_type_t stream_type, int recv_fd);
/* callbacks provided by xc_domain_restore */
struct restore_callbacks {
@@ -189,11 +190,11 @@ struct restore_callbacks {
* @param console_evtchn the console event channel for this domain to use
* @param console_mfn filled with the gfn of the console page
* @param console_domid the backend domain for xenconsole
- * @param stream_type XC_MIG_STREAM_NONE if the far end of the stream is using
+ * @param stream_type XC_STREAM_PLAIN if the far end of the stream is using
* checkpointing
* @param callbacks non-NULL to receive a callback to restore toolstack
* specific data
- * @param recv_df Only used for XC_MIG_STREAM_COLO. Contains backchannel to
+ * @param send_back_fd Only used for XC_STREAM_COLO. Contains backchannel to
* the source side.
* @return 0 on success, -1 on failure
*/
@@ -201,7 +202,7 @@ int xc_domain_restore(xc_interface *xch, int io_fd,
uint32_t dom,
unsigned int store_evtchn, unsigned long *store_mfn,
uint32_t store_domid, unsigned int console_evtchn,
unsigned long *console_mfn, uint32_t console_domid,
- xc_migration_stream_t stream_type,
+ xc_stream_type_t stream_type,
struct restore_callbacks *callbacks, int send_back_fd);
/**
diff --git a/tools/libxc/xc_nomigrate.c b/tools/libxc/xc_nomigrate.c
index 5a1d7e46f9..6795c62ddc 100644
--- a/tools/libxc/xc_nomigrate.c
+++ b/tools/libxc/xc_nomigrate.c
@@ -22,7 +22,7 @@
int xc_domain_save(xc_interface *xch, int io_fd, uint32_t dom, uint32_t flags,
struct save_callbacks *callbacks,
- xc_migration_stream_t stream_type, int recv_fd)
+ xc_stream_type_t stream_type, int recv_fd)
{
errno = ENOSYS;
return -1;
@@ -32,7 +32,7 @@ int xc_domain_restore(xc_interface *xch, int io_fd, uint32_t
dom,
unsigned int store_evtchn, unsigned long *store_mfn,
uint32_t store_domid, unsigned int console_evtchn,
unsigned long *console_mfn, uint32_t console_domid,
- xc_migration_stream_t stream_type,
+ xc_stream_type_t stream_type,
struct restore_callbacks *callbacks, int send_back_fd)
{
errno = ENOSYS;
diff --git a/tools/libxc/xc_sr_common.h b/tools/libxc/xc_sr_common.h
index 9caad8bfcb..b923ad5c10 100644
--- a/tools/libxc/xc_sr_common.h
+++ b/tools/libxc/xc_sr_common.h
@@ -203,6 +203,9 @@ struct xc_sr_context
uint32_t domid;
int fd;
+ /* Plain VM, or checkpoints over time. */
+ xc_stream_type_t stream_type;
+
xc_dominfo_t dominfo;
union /* Common save or restore data. */
@@ -217,9 +220,6 @@ struct xc_sr_context
/* Live migrate vs non live suspend. */
bool live;
- /* Plain VM, or checkpoints over time. */
- int checkpointed;
-
/* Further debugging information in the stream. */
bool debug;
@@ -250,9 +250,6 @@ struct xc_sr_context
uint32_t guest_type;
uint32_t guest_page_size;
- /* Plain VM, or checkpoints over time. */
- int checkpointed;
-
/* Currently buffering records between a checkpoint */
bool buffer_all_records;
diff --git a/tools/libxc/xc_sr_restore.c b/tools/libxc/xc_sr_restore.c
index 19442c3453..d9bf6fb5a1 100644
--- a/tools/libxc/xc_sr_restore.c
+++ b/tools/libxc/xc_sr_restore.c
@@ -512,7 +512,7 @@ static int handle_checkpoint(struct xc_sr_context *ctx)
int rc = 0, ret;
unsigned i;
- if ( !ctx->restore.checkpointed )
+ if ( ctx->stream_type == XC_STREAM_PLAIN )
{
ERROR("Found checkpoint in non-checkpointed stream");
rc = -1;
@@ -554,7 +554,7 @@ static int handle_checkpoint(struct xc_sr_context *ctx)
else
ctx->restore.buffer_all_records = true;
- if ( ctx->restore.checkpointed == XC_MIG_STREAM_COLO )
+ if ( ctx->stream_type == XC_STREAM_COLO )
{
#define HANDLE_CALLBACK_RETURN_VALUE(ret) \
do { \
@@ -673,7 +673,7 @@ static int setup(struct xc_sr_context *ctx)
DECLARE_HYPERCALL_BUFFER_SHADOW(unsigned long, dirty_bitmap,
&ctx->restore.dirty_bitmap_hbuf);
- if ( ctx->restore.checkpointed == XC_MIG_STREAM_COLO )
+ if ( ctx->stream_type == XC_STREAM_COLO )
{
dirty_bitmap = xc_hypercall_buffer_alloc_pages(xch, dirty_bitmap,
NRPAGES(bitmap_size(ctx->restore.p2m_size)));
@@ -724,7 +724,7 @@ static void cleanup(struct xc_sr_context *ctx)
for ( i = 0; i < ctx->restore.buffered_rec_num; i++ )
free(ctx->restore.buffered_records[i].data);
- if ( ctx->restore.checkpointed == XC_MIG_STREAM_COLO )
+ if ( ctx->stream_type == XC_STREAM_COLO )
xc_hypercall_buffer_free_pages(xch, dirty_bitmap,
NRPAGES(bitmap_size(ctx->restore.p2m_size)));
free(ctx->restore.buffered_records);
@@ -792,8 +792,7 @@ static int restore(struct xc_sr_context *ctx)
} while ( rec.type != REC_TYPE_END );
remus_failover:
-
- if ( ctx->restore.checkpointed == XC_MIG_STREAM_COLO )
+ if ( ctx->stream_type == XC_STREAM_COLO )
{
/* With COLO, we have already called stream_complete */
rc = 0;
@@ -833,36 +832,42 @@ int xc_domain_restore(xc_interface *xch, int io_fd,
uint32_t dom,
unsigned int store_evtchn, unsigned long *store_mfn,
uint32_t store_domid, unsigned int console_evtchn,
unsigned long *console_gfn, uint32_t console_domid,
- xc_migration_stream_t stream_type,
+ xc_stream_type_t stream_type,
struct restore_callbacks *callbacks, int send_back_fd)
{
xen_pfn_t nr_pfns;
- struct xc_sr_context ctx =
- {
- .xch = xch,
- .fd = io_fd,
- };
+ struct xc_sr_context ctx = {
+ .xch = xch,
+ .fd = io_fd,
+ .stream_type = stream_type,
+ };
/* GCC 4.4 (of CentOS 6.x vintage) can' t initialise anonymous unions. */
ctx.restore.console_evtchn = console_evtchn;
ctx.restore.console_domid = console_domid;
ctx.restore.xenstore_evtchn = store_evtchn;
ctx.restore.xenstore_domid = store_domid;
- ctx.restore.checkpointed = stream_type;
ctx.restore.callbacks = callbacks;
ctx.restore.send_back_fd = send_back_fd;
- /* Sanity checks for callbacks. */
- if ( stream_type )
- assert(callbacks->checkpoint);
-
- if ( ctx.restore.checkpointed == XC_MIG_STREAM_COLO )
+ /* Sanity check stream_type-related parameters */
+ switch ( stream_type )
{
- /* this is COLO restore */
+ case XC_STREAM_COLO:
assert(callbacks->suspend &&
callbacks->postcopy &&
callbacks->wait_checkpoint &&
callbacks->restore_results);
+ /* Fallthrough */
+ case XC_STREAM_REMUS:
+ assert(callbacks->checkpoint);
+ /* Fallthrough */
+ case XC_STREAM_PLAIN:
+ break;
+
+ default:
+ assert(!"Bad stream_type");
+ break;
}
if ( xc_domain_getinfo(xch, dom, 1, &ctx.dominfo) != 1 )
diff --git a/tools/libxc/xc_sr_save.c b/tools/libxc/xc_sr_save.c
index 6f61f85ee0..0651fa92bc 100644
--- a/tools/libxc/xc_sr_save.c
+++ b/tools/libxc/xc_sr_save.c
@@ -660,7 +660,7 @@ static int suspend_and_send_dirty(struct xc_sr_context *ctx)
bitmap_or(dirty_bitmap, ctx->save.deferred_pages, ctx->save.p2m_size);
- if ( !ctx->save.live && ctx->save.checkpointed == XC_MIG_STREAM_COLO )
+ if ( !ctx->save.live && ctx->stream_type == XC_STREAM_COLO )
{
rc = colo_merge_secondary_dirty_bitmap(ctx);
if ( rc )
@@ -741,7 +741,7 @@ static int send_domain_memory_live(struct xc_sr_context
*ctx)
if ( rc )
goto out;
- if ( ctx->save.debug && ctx->save.checkpointed != XC_MIG_STREAM_NONE )
+ if ( ctx->save.debug && ctx->stream_type != XC_STREAM_PLAIN )
{
rc = verify_frames(ctx);
if ( rc )
@@ -870,7 +870,7 @@ static int save(struct xc_sr_context *ctx, uint16_t
guest_type)
if ( ctx->save.live )
rc = send_domain_memory_live(ctx);
- else if ( ctx->save.checkpointed != XC_MIG_STREAM_NONE )
+ else if ( ctx->stream_type != XC_STREAM_PLAIN )
rc = send_domain_memory_checkpointed(ctx);
else
rc = send_domain_memory_nonlive(ctx);
@@ -890,7 +890,7 @@ static int save(struct xc_sr_context *ctx, uint16_t
guest_type)
if ( rc )
goto err;
- if ( ctx->save.checkpointed != XC_MIG_STREAM_NONE )
+ if ( ctx->stream_type != XC_STREAM_PLAIN )
{
/*
* We have now completed the initial live portion of the checkpoint
@@ -903,7 +903,7 @@ static int save(struct xc_sr_context *ctx, uint16_t
guest_type)
if ( rc )
goto err;
- if ( ctx->save.checkpointed == XC_MIG_STREAM_COLO )
+ if ( ctx->stream_type == XC_STREAM_COLO )
{
rc =
ctx->save.callbacks->checkpoint(ctx->save.callbacks->data);
if ( !rc )
@@ -917,14 +917,14 @@ static int save(struct xc_sr_context *ctx, uint16_t
guest_type)
if ( rc <= 0 )
goto err;
- if ( ctx->save.checkpointed == XC_MIG_STREAM_COLO )
+ if ( ctx->stream_type == XC_STREAM_COLO )
{
rc = ctx->save.callbacks->wait_checkpoint(
ctx->save.callbacks->data);
if ( rc <= 0 )
goto err;
}
- else if ( ctx->save.checkpointed == XC_MIG_STREAM_REMUS )
+ else if ( ctx->stream_type == XC_STREAM_REMUS )
{
rc =
ctx->save.callbacks->checkpoint(ctx->save.callbacks->data);
if ( rc <= 0 )
@@ -937,7 +937,7 @@ static int save(struct xc_sr_context *ctx, uint16_t
guest_type)
goto err;
}
}
- } while ( ctx->save.checkpointed != XC_MIG_STREAM_NONE );
+ } while ( ctx->stream_type != XC_STREAM_PLAIN );
xc_report_progress_single(xch, "End of stream");
@@ -967,19 +967,18 @@ static int save(struct xc_sr_context *ctx, uint16_t
guest_type)
int xc_domain_save(xc_interface *xch, int io_fd, uint32_t dom,
uint32_t flags, struct save_callbacks* callbacks,
- xc_migration_stream_t stream_type, int recv_fd)
+ xc_stream_type_t stream_type, int recv_fd)
{
- struct xc_sr_context ctx =
- {
- .xch = xch,
- .fd = io_fd,
- };
+ struct xc_sr_context ctx = {
+ .xch = xch,
+ .fd = io_fd,
+ .stream_type = stream_type,
+ };
/* GCC 4.4 (of CentOS 6.x vintage) can' t initialise anonymous unions. */
ctx.save.callbacks = callbacks;
ctx.save.live = !!(flags & XCFLAGS_LIVE);
ctx.save.debug = !!(flags & XCFLAGS_DEBUG);
- ctx.save.checkpointed = stream_type;
ctx.save.recv_fd = recv_fd;
if ( xc_domain_getinfo(xch, dom, 1, &ctx.dominfo) != 1 )
@@ -994,18 +993,24 @@ int xc_domain_save(xc_interface *xch, int io_fd, uint32_t
dom,
return -1;
}
- /* If altering migration_stream update this assert too. */
- assert(stream_type == XC_MIG_STREAM_NONE ||
- stream_type == XC_MIG_STREAM_REMUS ||
- stream_type == XC_MIG_STREAM_COLO);
-
- /* Sanity checks for callbacks. */
- if ( ctx.dominfo.hvm )
- assert(callbacks->switch_qemu_logdirty);
- if ( ctx.save.checkpointed )
- assert(callbacks->checkpoint && callbacks->postcopy);
- if ( ctx.save.checkpointed == XC_MIG_STREAM_COLO )
+ /* Sanity check stream_type-related parameters */
+ switch ( stream_type )
+ {
+ case XC_STREAM_COLO:
assert(callbacks->wait_checkpoint);
+ /* Fallthrough */
+ case XC_STREAM_REMUS:
+ assert(callbacks->checkpoint && callbacks->postcopy);
+ /* Fallthrough */
+ case XC_STREAM_PLAIN:
+ if ( ctx.dominfo.hvm )
+ assert(callbacks->switch_qemu_logdirty);
+ break;
+
+ default:
+ assert(!"Bad stream_type");
+ break;
+ }
DPRINTF("fd %d, dom %u, flags %u, hvm %d",
io_fd, dom, flags, ctx.dominfo.hvm);
diff --git a/tools/libxl/libxl_save_helper.c b/tools/libxl/libxl_save_helper.c
index 0f52930c45..017c7cd988 100644
--- a/tools/libxl/libxl_save_helper.c
+++ b/tools/libxl/libxl_save_helper.c
@@ -253,7 +253,7 @@ int main(int argc, char **argv)
uint32_t dom = strtoul(NEXTARG,0,10);
uint32_t flags = strtoul(NEXTARG,0,10);
unsigned cbflags = strtoul(NEXTARG,0,10);
- xc_migration_stream_t stream_type = strtoul(NEXTARG,0,10);
+ xc_stream_type_t stream_type = strtoul(NEXTARG,0,10);
assert(!*++argv);
helper_setcallbacks_save(&helper_save_callbacks, cbflags);
@@ -275,7 +275,7 @@ int main(int argc, char **argv)
unsigned console_evtchn = strtoul(NEXTARG,0,10);
domid_t console_domid = strtoul(NEXTARG,0,10);
unsigned cbflags = strtoul(NEXTARG,0,10);
- xc_migration_stream_t stream_type = strtoul(NEXTARG,0,10);
+ xc_stream_type_t stream_type = strtoul(NEXTARG,0,10);
assert(!*++argv);
helper_setcallbacks_restore(&helper_restore_callbacks, cbflags);
--
generated by git-patchbot for /home/xen/git/xen.git#staging
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