[Xen-devel] [PATCH v6 12/16] libxc/save: reuse send_dirty_pages() in send_all_pages()

[Yang Hongyang <yanghy@xxxxxxxxxxxxxx>]

introduce bitmap_set() to set the entire bitmap.
in send_all_pages(), set the entire bitmap and call send_dirty_pages().

Signed-off-by: Yang Hongyang <yanghy@xxxxxxxxxxxxxx>
CC: Ian Campbell <Ian.Campbell@xxxxxxxxxx>
CC: Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>
CC: Wei Liu <wei.liu2@xxxxxxxxxx>
CC: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
Reviewed-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
---
 tools/libxc/xc_bitops.h  |  5 +++++
 tools/libxc/xc_sr_save.c | 44 ++++++++++++++------------------------------
 2 files changed, 19 insertions(+), 30 deletions(-)

diff --git a/tools/libxc/xc_bitops.h b/tools/libxc/xc_bitops.h
index dfce3b8..cd749f4 100644
--- a/tools/libxc/xc_bitops.h
+++ b/tools/libxc/xc_bitops.h
@@ -26,6 +26,11 @@ static inline unsigned long *bitmap_alloc(int nr_bits)
     return calloc(1, bitmap_size(nr_bits));
 }
 
+static inline void bitmap_set(unsigned long *addr, int nr_bits)
+{
+    memset(addr, 0xff, bitmap_size(nr_bits));
+}
+
 static inline void bitmap_clear(unsigned long *addr, int nr_bits)
 {
     memset(addr, 0, bitmap_size(nr_bits));
diff --git a/tools/libxc/xc_sr_save.c b/tools/libxc/xc_sr_save.c
index 3768bda..1d0a46d 100644
--- a/tools/libxc/xc_sr_save.c
+++ b/tools/libxc/xc_sr_save.c
@@ -344,36 +344,6 @@ static int suspend_domain(struct xc_sr_context *ctx)
 }
 
 /*
- * Send all pages in the guests p2m.  Used as the first iteration of the live
- * migration loop, and for a non-live save.
- */
-static int send_all_pages(struct xc_sr_context *ctx)
-{
-    xc_interface *xch = ctx->xch;
-    xen_pfn_t p;
-    int rc;
-
-    for ( p = 0; p < ctx->save.p2m_size; ++p )
-    {
-        rc = add_to_batch(ctx, p);
-        if ( rc )
-            return rc;
-
-        /* Update progress every 4MB worth of memory sent. */
-        if ( (p & ((1U << (22 - 12)) - 1)) == 0 )
-            xc_report_progress_step(xch, p, ctx->save.p2m_size);
-    }
-
-    rc = flush_batch(ctx);
-    if ( rc )
-        return rc;
-
-    xc_report_progress_step(xch, ctx->save.p2m_size,
-                            ctx->save.p2m_size);
-    return 0;
-}
-
-/*
  * Send a subset of pages in the guests p2m, according to the dirty bitmap.
  * Used for each subsequent iteration of the live migration loop.
  *
@@ -416,6 +386,20 @@ static int send_dirty_pages(struct xc_sr_context *ctx,
     return 0;
 }
 
+/*
+ * Send all pages in the guests p2m.  Used as the first iteration of the live
+ * migration loop, and for a non-live save.
+ */
+static int send_all_pages(struct xc_sr_context *ctx)
+{
+    DECLARE_HYPERCALL_BUFFER_SHADOW(unsigned long, dirty_bitmap,
+                                    &ctx->save.dirty_bitmap_hbuf);
+
+    bitmap_set(dirty_bitmap, ctx->save.p2m_size);
+
+    return send_dirty_pages(ctx, ctx->save.p2m_size);
+}
+
 static int enable_logdirty(struct xc_sr_context *ctx)
 {
     xc_interface *xch = ctx->xch;
-- 
1.9.1


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