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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH v5 02/14] libxc/save: Adjust stream-position callbacks for checkpointed streams
From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
There are some records which should only be sent once in the stream, and not
repeated for each checkpoint. {start,end}_of_stream() become per-checkpoint,
and a new start_of_stream() is introduced.
There is no resulting change record order, but the X86_PV_INFO record is
identified as once per stream. Currently the X86_PV_P2M_FRAMES record is as
well, but this is because of an implementation bug and can move back to being
on an as-needed basis when fixed.
In addition, a few minor adjustments of comments and layout.
Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
CC: Ian Campbell <Ian.Campbell@xxxxxxxxxx>
CC: Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>
CC: Wei Liu <wei.liu2@xxxxxxxxxx>
CC: Yang Hongyang <yanghy@xxxxxxxxxxxxxx>
---
tools/libxc/xc_sr_common.h | 21 +++++++++++++--------
tools/libxc/xc_sr_save.c | 10 +++++++---
tools/libxc/xc_sr_save_x86_hvm.c | 23 +++++++++++++++--------
tools/libxc/xc_sr_save_x86_pv.c | 29 +++++++++++++++++++----------
4 files changed, 54 insertions(+), 29 deletions(-)
diff --git a/tools/libxc/xc_sr_common.h b/tools/libxc/xc_sr_common.h
index ef42412..c4fe92c 100644
--- a/tools/libxc/xc_sr_common.h
+++ b/tools/libxc/xc_sr_common.h
@@ -61,19 +61,24 @@ struct xc_sr_save_ops
int (*setup)(struct xc_sr_context *ctx);
/**
- * Write records which need to be at the start of the stream. This is
- * called after the Image and Domain headers are written. (Any records
- * which need to be ahead of the memory.)
+ * Send records which need to be at the start of the stream. This is
+ * called once, after the Image and Domain headers are written.
*/
int (*start_of_stream)(struct xc_sr_context *ctx);
/**
- * Write records which need to be at the end of the stream, following the
- * complete memory contents. The caller shall handle writing the END
- * record into the stream. (Any records which need to be after the memory
- * is complete.)
+ * Send records which need to be at the start of a checkpoint. This is
+ * called once, or once per checkpoint in a checkpointed stream, and is
+ * ahead of memory data.
*/
- int (*end_of_stream)(struct xc_sr_context *ctx);
+ int (*start_of_checkpoint)(struct xc_sr_context *ctx);
+
+ /**
+ * Send records which need to be at the end of the checkpoint. This is
+ * called once, or once per checkpoint in a checkpointed stream, and is
+ * after the memory data.
+ */
+ int (*end_of_checkpoint)(struct xc_sr_context *ctx);
/**
* Clean up the local environment. Will be called exactly once, either
diff --git a/tools/libxc/xc_sr_save.c b/tools/libxc/xc_sr_save.c
index 83f0591..66fcd3e 100644
--- a/tools/libxc/xc_sr_save.c
+++ b/tools/libxc/xc_sr_save.c
@@ -662,6 +662,10 @@ static int save(struct xc_sr_context *ctx, uint16_t
guest_type)
if ( rc )
goto err;
+ rc = ctx->save.ops.start_of_checkpoint(ctx);
+ if ( rc )
+ goto err;
+
if ( ctx->save.live )
rc = send_domain_memory_live(ctx);
else
@@ -678,12 +682,12 @@ static int save(struct xc_sr_context *ctx, uint16_t
guest_type)
goto err;
}
- xc_report_progress_single(xch, "End of stream");
-
- rc = ctx->save.ops.end_of_stream(ctx);
+ rc = ctx->save.ops.end_of_checkpoint(ctx);
if ( rc )
goto err;
+ xc_report_progress_single(xch, "End of stream");
+
rc = write_end_record(ctx);
if ( rc )
goto err;
diff --git a/tools/libxc/xc_sr_save_x86_hvm.c b/tools/libxc/xc_sr_save_x86_hvm.c
index 58efdb9..f4604db 100644
--- a/tools/libxc/xc_sr_save_x86_hvm.c
+++ b/tools/libxc/xc_sr_save_x86_hvm.c
@@ -184,7 +184,13 @@ static int x86_hvm_start_of_stream(struct xc_sr_context
*ctx)
return 0;
}
-static int x86_hvm_end_of_stream(struct xc_sr_context *ctx)
+static int x86_hvm_start_of_checkpoint(struct xc_sr_context *ctx)
+{
+ /* no-op */
+ return 0;
+}
+
+static int x86_hvm_end_of_checkpoint(struct xc_sr_context *ctx)
{
int rc;
@@ -209,7 +215,7 @@ static int x86_hvm_end_of_stream(struct xc_sr_context *ctx)
if ( rc )
return rc;
- return rc;
+ return 0;
}
static int x86_hvm_cleanup(struct xc_sr_context *ctx)
@@ -230,12 +236,13 @@ static int x86_hvm_cleanup(struct xc_sr_context *ctx)
struct xc_sr_save_ops save_ops_x86_hvm =
{
- .pfn_to_gfn = x86_hvm_pfn_to_gfn,
- .normalise_page = x86_hvm_normalise_page,
- .setup = x86_hvm_setup,
- .start_of_stream = x86_hvm_start_of_stream,
- .end_of_stream = x86_hvm_end_of_stream,
- .cleanup = x86_hvm_cleanup,
+ .pfn_to_gfn = x86_hvm_pfn_to_gfn,
+ .normalise_page = x86_hvm_normalise_page,
+ .setup = x86_hvm_setup,
+ .start_of_stream = x86_hvm_start_of_stream,
+ .start_of_checkpoint = x86_hvm_start_of_checkpoint,
+ .end_of_checkpoint = x86_hvm_end_of_checkpoint,
+ .cleanup = x86_hvm_cleanup,
};
/*
diff --git a/tools/libxc/xc_sr_save_x86_pv.c b/tools/libxc/xc_sr_save_x86_pv.c
index a668221..f63f40b 100644
--- a/tools/libxc/xc_sr_save_x86_pv.c
+++ b/tools/libxc/xc_sr_save_x86_pv.c
@@ -816,6 +816,12 @@ static int x86_pv_start_of_stream(struct xc_sr_context
*ctx)
if ( rc )
return rc;
+ /*
+ * Ideally should be able to change during migration. Currently
+ * corruption will occur if the contents or location of the P2M changes
+ * during the live migration loop. If one is very lucky, the breakage
+ * will not be subtle.
+ */
rc = write_x86_pv_p2m_frames(ctx);
if ( rc )
return rc;
@@ -823,10 +829,12 @@ static int x86_pv_start_of_stream(struct xc_sr_context
*ctx)
return 0;
}
-/*
- * save_ops function. Writes tail records information into the stream.
- */
-static int x86_pv_end_of_stream(struct xc_sr_context *ctx)
+static int x86_pv_start_of_checkpoint(struct xc_sr_context *ctx)
+{
+ return 0;
+}
+
+static int x86_pv_end_of_checkpoint(struct xc_sr_context *ctx)
{
int rc;
@@ -866,12 +874,13 @@ static int x86_pv_cleanup(struct xc_sr_context *ctx)
struct xc_sr_save_ops save_ops_x86_pv =
{
- .pfn_to_gfn = x86_pv_pfn_to_gfn,
- .normalise_page = x86_pv_normalise_page,
- .setup = x86_pv_setup,
- .start_of_stream = x86_pv_start_of_stream,
- .end_of_stream = x86_pv_end_of_stream,
- .cleanup = x86_pv_cleanup,
+ .pfn_to_gfn = x86_pv_pfn_to_gfn,
+ .normalise_page = x86_pv_normalise_page,
+ .setup = x86_pv_setup,
+ .start_of_stream = x86_pv_start_of_stream,
+ .start_of_checkpoint = x86_pv_start_of_checkpoint,
+ .end_of_checkpoint = x86_pv_end_of_checkpoint,
+ .cleanup = x86_pv_cleanup,
};
/*
--
1.9.1
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