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[Xen-devel] Re: [PATCH] xen: introduce xen_change_state_handler

To: stefano.stabellini@xxxxxxxxxxxxx
Subject: [Xen-devel] Re: [PATCH] xen: introduce xen_change_state_handler
From: Alexander Graf <agraf@xxxxxxx>
Date: Thu, 30 Jun 2011 14:11:46 +0200
Cc: Anthony PERARD <anthony.perard@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxx, qemu-devel@xxxxxxxxxx
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On 06/29/2011 01:16 PM, stefano.stabellini@xxxxxxxxxxxxx wrote:
From: Anthony PERARD<anthony.perard@xxxxxxxxxx>

Remove the call to xenstore_record_dm_state from xen_main_loop_prepare
that is HVM specific.
Add a new vm_change_state_handler shared between xen_pv and xen_hvm
machines to record the VM state to xenstore.

Signed-off-by: Anthony PERARD<anthony.perard@xxxxxxxxxx>
Signed-off-by: Stefano Stabellini<stefano.stabellini@xxxxxxxxxxxxx>
  xen-all.c |   25 ++++++++++++++++++-------
  1 files changed, 18 insertions(+), 7 deletions(-)

diff --git a/xen-all.c b/xen-all.c
index 3fd04ef..e8da35f 100644
--- a/xen-all.c
+++ b/xen-all.c
@@ -797,12 +797,17 @@ void xenstore_store_pv_console_info(int i, 
CharDriverState *chr)

-static void xenstore_record_dm_state(XenIOState *s, const char *state)
+static void xenstore_record_dm_state(struct xs_handle *xs, const char *state)
      char path[50];

+    if (xs == NULL) {
+        fprintf(stderr, "xenstore connection not initialized\n");
+        exit(1);
+    }
      snprintf(path, sizeof (path), "/local/domain/0/device-model/%u/state", 
-    if (!xs_write(s->xenstore, XBT_NULL, path, state, strlen(state))) {
+    if (!xs_write(xs, XBT_NULL, path, state, strlen(state))) {
          fprintf(stderr, "error recording dm state\n");
@@ -823,15 +828,20 @@ static void xen_main_loop_prepare(XenIOState *state)
      if (evtchn_fd != -1) {
          qemu_set_fd_handler(evtchn_fd, cpu_handle_ioreq, NULL, state);
-    /* record state running */
-    xenstore_record_dm_state(state, "running");

  /* Initialise Xen */

-static void xen_vm_change_state_handler(void *opaque, int running, int reason)
+static void xen_change_state_handler(void *opaque, int running, int reason)
+    if (running) {
+        /* record state running */
+        xenstore_record_dm_state(xenstore, "running");
+    }

So where is this ever executed in the PV case?


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