diff mbox series

[v20210713,20/31] tools: restore: split record processing

Message ID 20210713180605.12096-21-olaf@aepfle.de (mailing list archive)
State New
Headers show
Series leftover from 2020 | expand

Commit Message

Olaf Hering July 13, 2021, 6:05 p.m. UTC
handle_page_data must be able to read directly into mapped guest memory.
This will avoid unneccesary memcpy calls for data which can be consumed verbatim.

Rearrange the code to allow decisions based on the incoming record.

This change is preparation for future changes in handle_page_data,
no change in behavior is intended.

Signed-off-by: Olaf Hering <olaf@aepfle.de>
Reviewed-by: Juergen Gross <jgross@suse.com>
---
 tools/libs/guest/xg_sr_common.c  | 33 ++++++++++++---------
 tools/libs/guest/xg_sr_common.h  |  4 ++-
 tools/libs/guest/xg_sr_restore.c | 49 ++++++++++++++++++++++----------
 tools/libs/guest/xg_sr_save.c    |  7 ++++-
 4 files changed, 63 insertions(+), 30 deletions(-)
diff mbox series

Patch

diff --git a/tools/libs/guest/xg_sr_common.c b/tools/libs/guest/xg_sr_common.c
index 17567ab133..cabde4ef74 100644
--- a/tools/libs/guest/xg_sr_common.c
+++ b/tools/libs/guest/xg_sr_common.c
@@ -91,26 +91,33 @@  int write_split_record(struct xc_sr_context *ctx, struct xc_sr_record *rec,
     return -1;
 }
 
-int read_record(struct xc_sr_context *ctx, int fd, struct xc_sr_record *rec)
+int read_record_header(struct xc_sr_context *ctx, int fd, struct xc_sr_rhdr *rhdr)
 {
     xc_interface *xch = ctx->xch;
-    struct xc_sr_rhdr rhdr;
-    size_t datasz;
 
-    if ( read_exact(fd, &rhdr, sizeof(rhdr)) )
+    if ( read_exact(fd, rhdr, sizeof(*rhdr)) )
     {
         PERROR("Failed to read Record Header from stream");
         return -1;
     }
 
-    if ( rhdr.length > REC_LENGTH_MAX )
+    if ( rhdr->length > REC_LENGTH_MAX )
     {
-        ERROR("Record (0x%08x, %s) length %#x exceeds max (%#x)", rhdr.type,
-              rec_type_to_str(rhdr.type), rhdr.length, REC_LENGTH_MAX);
+        ERROR("Record (0x%08x, %s) length %#x exceeds max (%#x)", rhdr->type,
+              rec_type_to_str(rhdr->type), rhdr->length, REC_LENGTH_MAX);
         return -1;
     }
 
-    datasz = ROUNDUP(rhdr.length, REC_ALIGN_ORDER);
+    return 0;
+}
+
+int read_record_data(struct xc_sr_context *ctx, int fd, struct xc_sr_rhdr *rhdr,
+                     struct xc_sr_record *rec)
+{
+    xc_interface *xch = ctx->xch;
+    size_t datasz;
+
+    datasz = ROUNDUP(rhdr->length, REC_ALIGN_ORDER);
 
     if ( datasz )
     {
@@ -119,7 +126,7 @@  int read_record(struct xc_sr_context *ctx, int fd, struct xc_sr_record *rec)
         if ( !rec->data )
         {
             ERROR("Unable to allocate %zu bytes for record data (0x%08x, %s)",
-                  datasz, rhdr.type, rec_type_to_str(rhdr.type));
+                  datasz, rhdr->type, rec_type_to_str(rhdr->type));
             return -1;
         }
 
@@ -128,18 +135,18 @@  int read_record(struct xc_sr_context *ctx, int fd, struct xc_sr_record *rec)
             free(rec->data);
             rec->data = NULL;
             PERROR("Failed to read %zu bytes of data for record (0x%08x, %s)",
-                   datasz, rhdr.type, rec_type_to_str(rhdr.type));
+                   datasz, rhdr->type, rec_type_to_str(rhdr->type));
             return -1;
         }
     }
     else
         rec->data = NULL;
 
-    rec->type   = rhdr.type;
-    rec->length = rhdr.length;
+    rec->type   = rhdr->type;
+    rec->length = rhdr->length;
 
     return 0;
-};
+}
 
 static void __attribute__((unused)) build_assertions(void)
 {
diff --git a/tools/libs/guest/xg_sr_common.h b/tools/libs/guest/xg_sr_common.h
index c6c6a31dc6..077d8f2890 100644
--- a/tools/libs/guest/xg_sr_common.h
+++ b/tools/libs/guest/xg_sr_common.h
@@ -458,7 +458,9 @@  static inline int write_record(struct xc_sr_context *ctx,
  *
  * On failure, the contents of the record structure are undefined.
  */
-int read_record(struct xc_sr_context *ctx, int fd, struct xc_sr_record *rec);
+int read_record_header(struct xc_sr_context *ctx, int fd, struct xc_sr_rhdr *rhdr);
+int read_record_data(struct xc_sr_context *ctx, int fd, struct xc_sr_rhdr *rhdr,
+                     struct xc_sr_record *rec);
 
 /*
  * This would ideally be private in restore.c, but is needed by
diff --git a/tools/libs/guest/xg_sr_restore.c b/tools/libs/guest/xg_sr_restore.c
index 2734ef06fd..8f6da97d09 100644
--- a/tools/libs/guest/xg_sr_restore.c
+++ b/tools/libs/guest/xg_sr_restore.c
@@ -466,7 +466,7 @@  static int send_checkpoint_dirty_pfn_list(struct xc_sr_context *ctx)
     return rc;
 }
 
-static int process_record(struct xc_sr_context *ctx, struct xc_sr_record *rec);
+static int process_buffered_record(struct xc_sr_context *ctx, struct xc_sr_record *rec);
 static int handle_checkpoint(struct xc_sr_context *ctx)
 {
     xc_interface *xch = ctx->xch;
@@ -505,7 +505,7 @@  static int handle_checkpoint(struct xc_sr_context *ctx)
 
         for ( i = 0; i < ctx->restore.buffered_rec_num; i++ )
         {
-            rc = process_record(ctx, &ctx->restore.buffered_records[i]);
+            rc = process_buffered_record(ctx, &ctx->restore.buffered_records[i]);
             if ( rc )
                 goto err;
         }
@@ -566,10 +566,11 @@  static int handle_checkpoint(struct xc_sr_context *ctx)
     return rc;
 }
 
-static int buffer_record(struct xc_sr_context *ctx, struct xc_sr_record *rec)
+static int buffer_record(struct xc_sr_context *ctx, struct xc_sr_rhdr *rhdr)
 {
     xc_interface *xch = ctx->xch;
     unsigned int new_alloc_num;
+    struct xc_sr_record rec;
     struct xc_sr_record *p;
 
     if ( ctx->restore.buffered_rec_num >= ctx->restore.allocated_rec_num )
@@ -587,8 +588,13 @@  static int buffer_record(struct xc_sr_context *ctx, struct xc_sr_record *rec)
         ctx->restore.allocated_rec_num = new_alloc_num;
     }
 
+    if ( read_record_data(ctx, ctx->fd, rhdr, &rec) )
+    {
+        return -1;
+    }
+
     memcpy(&ctx->restore.buffered_records[ctx->restore.buffered_rec_num++],
-           rec, sizeof(*rec));
+           &rec, sizeof(rec));
 
     return 0;
 }
@@ -619,7 +625,7 @@  int handle_static_data_end(struct xc_sr_context *ctx)
     return rc;
 }
 
-static int process_record(struct xc_sr_context *ctx, struct xc_sr_record *rec)
+static int process_buffered_record(struct xc_sr_context *ctx, struct xc_sr_record *rec)
 {
     xc_interface *xch = ctx->xch;
     int rc = 0;
@@ -657,6 +663,19 @@  static int process_record(struct xc_sr_context *ctx, struct xc_sr_record *rec)
     return rc;
 }
 
+static int process_incoming_record_header(struct xc_sr_context *ctx, struct xc_sr_rhdr *rhdr)
+{
+    struct xc_sr_record rec;
+    int rc;
+
+    rc = read_record_data(ctx, ctx->fd, rhdr, &rec);
+    if ( rc )
+        return rc;
+
+    return process_buffered_record(ctx, &rec);
+}
+
+
 static int setup(struct xc_sr_context *ctx)
 {
     xc_interface *xch = ctx->xch;
@@ -753,7 +772,7 @@  static void cleanup(struct xc_sr_context *ctx)
 static int restore(struct xc_sr_context *ctx)
 {
     xc_interface *xch = ctx->xch;
-    struct xc_sr_record rec;
+    struct xc_sr_rhdr rhdr;
     int rc, saved_rc = 0, saved_errno = 0;
 
     IPRINTF("Restoring domain");
@@ -764,7 +783,7 @@  static int restore(struct xc_sr_context *ctx)
 
     do
     {
-        rc = read_record(ctx, ctx->fd, &rec);
+        rc = read_record_header(ctx, ctx->fd, &rhdr);
         if ( rc )
         {
             if ( ctx->restore.buffer_all_records )
@@ -774,25 +793,25 @@  static int restore(struct xc_sr_context *ctx)
         }
 
         if ( ctx->restore.buffer_all_records &&
-             rec.type != REC_TYPE_END &&
-             rec.type != REC_TYPE_CHECKPOINT )
+             rhdr.type != REC_TYPE_END &&
+             rhdr.type != REC_TYPE_CHECKPOINT )
         {
-            rc = buffer_record(ctx, &rec);
+            rc = buffer_record(ctx, &rhdr);
             if ( rc )
                 goto err;
         }
         else
         {
-            rc = process_record(ctx, &rec);
+            rc = process_incoming_record_header(ctx, &rhdr);
             if ( rc == RECORD_NOT_PROCESSED )
             {
-                if ( rec.type & REC_TYPE_OPTIONAL )
+                if ( rhdr.type & REC_TYPE_OPTIONAL )
                     DPRINTF("Ignoring optional record %#x (%s)",
-                            rec.type, rec_type_to_str(rec.type));
+                            rhdr.type, rec_type_to_str(rhdr.type));
                 else
                 {
                     ERROR("Mandatory record %#x (%s) not handled",
-                          rec.type, rec_type_to_str(rec.type));
+                          rhdr.type, rec_type_to_str(rhdr.type));
                     rc = -1;
                     goto err;
                 }
@@ -803,7 +822,7 @@  static int restore(struct xc_sr_context *ctx)
                 goto err;
         }
 
-    } while ( rec.type != REC_TYPE_END );
+    } while ( rhdr.type != REC_TYPE_END );
 
  remus_failover:
     if ( ctx->stream_type == XC_STREAM_COLO )
diff --git a/tools/libs/guest/xg_sr_save.c b/tools/libs/guest/xg_sr_save.c
index c74c8d9348..ef8c49f23d 100644
--- a/tools/libs/guest/xg_sr_save.c
+++ b/tools/libs/guest/xg_sr_save.c
@@ -591,6 +591,7 @@  static int send_memory_live(struct xc_sr_context *ctx)
 static int colo_merge_secondary_dirty_bitmap(struct xc_sr_context *ctx)
 {
     xc_interface *xch = ctx->xch;
+    struct xc_sr_rhdr rhdr;
     struct xc_sr_record rec;
     uint64_t *pfns = NULL;
     uint64_t pfn;
@@ -599,7 +600,11 @@  static int colo_merge_secondary_dirty_bitmap(struct xc_sr_context *ctx)
     DECLARE_HYPERCALL_BUFFER_SHADOW(unsigned long, dirty_bitmap,
                                     &ctx->save.dirty_bitmap_hbuf);
 
-    rc = read_record(ctx, ctx->save.recv_fd, &rec);
+    rc = read_record_header(ctx, ctx->save.recv_fd, &rhdr);
+    if ( rc )
+        goto err;
+
+    rc = read_record_data(ctx, ctx->save.recv_fd, &rhdr, &rec);
     if ( rc )
         goto err;