[Xen-devel] [PATCH v9 15/25] send store gfn and console gfn to xl before resuming secondary vm

[Wen Congyang <wency@xxxxxxxxxxxxxx>]

We will call libxl__xc_domain_restore_done() to rebuild secondary vm. But
we need store gfn and console gfn when rebuilding secondary vm. So make
restore_results a function pointer in callback struct and struct
{save,restore}_callbacks, and use this callback to send store gfn and
console gfn to xl.

Signed-off-by: Wen Congyang <wency@xxxxxxxxxxxxxx>
Signed-off-by: Yang Hongyang <hongyang.yang@xxxxxxxxxxxx>
CC: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
---
 tools/libxc/include/xenguest.h     | 8 ++++++++
 tools/libxc/xc_sr_restore.c        | 7 +++++--
 tools/libxl/libxl_colo_restore.c   | 5 -----
 tools/libxl/libxl_create.c         | 2 ++
 tools/libxl/libxl_save_msgs_gen.pl | 4 ++--
 5 files changed, 17 insertions(+), 9 deletions(-)

diff --git a/tools/libxc/include/xenguest.h b/tools/libxc/include/xenguest.h
index 7c74977..df36147 100644
--- a/tools/libxc/include/xenguest.h
+++ b/tools/libxc/include/xenguest.h
@@ -121,6 +121,14 @@ struct restore_callbacks {
      */
     int (*should_checkpoint)(void* data);
 
+    /*
+     * callback to send store gfn and console gfn to xl
+     * if we want to resume vm before xc_domain_save()
+     * exits.
+     */
+    void (*restore_results)(xen_pfn_t store_gfn, xen_pfn_t console_gfn,
+                            void *data);
+
     /* to be provided as the last argument to each callback function */
     void* data;
 };
diff --git a/tools/libxc/xc_sr_restore.c b/tools/libxc/xc_sr_restore.c
index 83df539..6c480d3 100644
--- a/tools/libxc/xc_sr_restore.c
+++ b/tools/libxc/xc_sr_restore.c
@@ -565,7 +565,9 @@ static int handle_checkpoint(struct xc_sr_context *ctx)
         if ( rc )
             goto err;
 
-        /* TODO: call restore_results */
+        ctx->restore.callbacks->restore_results(ctx->restore.xenstore_gfn,
+                                                ctx->restore.console_gfn,
+                                                ctx->restore.callbacks->data);
 
         /* Resume secondary vm */
         ret = ctx->restore.callbacks->postcopy(ctx->restore.callbacks->data);
@@ -848,7 +850,8 @@ int xc_domain_restore(xc_interface *xch, int io_fd, 
uint32_t dom,
         /* this is COLO restore */
         assert(callbacks->suspend &&
                callbacks->postcopy &&
-               callbacks->should_checkpoint);
+               callbacks->should_checkpoint &&
+               callbacks->restore_results);
     }
 
     DPRINTF("fd %d, dom %u, hvm %u, pae %u, superpages %d"
diff --git a/tools/libxl/libxl_colo_restore.c b/tools/libxl/libxl_colo_restore.c
index 4f25f27..f23ef8f 100644
--- a/tools/libxl/libxl_colo_restore.c
+++ b/tools/libxl/libxl_colo_restore.c
@@ -139,11 +139,6 @@ static void colo_resume_vm(libxl__egc *egc,
         return;
     }
 
-    /*
-     * TODO: get store gfn and console gfn
-     *  We should call the callback restore_results in
-     *  xc_domain_restore() before resuming the guest.
-     */
     libxl__xc_domain_restore_done(egc, dcs, 0, 0, 0);
 
     return;
diff --git a/tools/libxl/libxl_create.c b/tools/libxl/libxl_create.c
index 62aa7c9..b495741 100644
--- a/tools/libxl/libxl_create.c
+++ b/tools/libxl/libxl_create.c
@@ -1042,6 +1042,8 @@ static void domcreate_bootloader_done(libxl__egc *egc,
     dcs->srs.back_channel = false;
     dcs->srs.completion_callback = domcreate_stream_done;
 
+    callbacks->restore_results = libxl__srm_callout_callback_restore_results;
+
     if (restore_fd >= 0) {
         switch (checkpointed_stream) {
         case LIBXL_CHECKPOINTED_STREAM_COLO:
diff --git a/tools/libxl/libxl_save_msgs_gen.pl 
b/tools/libxl/libxl_save_msgs_gen.pl
index 7c9859b..aea07b4 100755
--- a/tools/libxl/libxl_save_msgs_gen.pl
+++ b/tools/libxl/libxl_save_msgs_gen.pl
@@ -29,8 +29,8 @@ our @msgs = (
     [  6, 'srcxA',  "should_checkpoint", [] ],
     [  7, 'scxA',   "switch_qemu_logdirty",  [qw(int domid
                                               unsigned enable)] ],
-    [  8, 'r',      "restore_results",       ['unsigned long', 'store_mfn',
-                                              'unsigned long', 'console_mfn'] 
],
+    [  8, 'rcx',    "restore_results",       ['unsigned long', 'store_gfn',
+                                              'unsigned long', 'console_gfn'] 
],
     [  9, 'srW',    "complete",              [qw(int retval
                                                  int errnoval)] ],
 );
-- 
2.5.0




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