0620-libxl-Add-additional-domain-suspend-resume-logs.patch

From 1227dd53e848563f1552afdf04d4d32b1f1d440f Mon Sep 17 00:00:00 2001
From: Demi Marie Obenour <demi@invisiblethingslab.com>
Date: Mon, 26 Sep 2022 11:05:32 -0400
Subject: [PATCH 20/26] libxl: Add additional domain suspend/resume logs

This was useful when debugging, but is not required.

Signed-off-by: Demi Marie Obenour <demi@invisiblethingslab.com>
---
 tools/libs/light/libxl_dom_suspend.c | 20 ++++++++++++++++++--
 tools/libs/light/libxl_domain.c      |  1 +
 2 files changed, 19 insertions(+), 2 deletions(-)

diff --git a/tools/libs/light/libxl_dom_suspend.c b/tools/libs/light/libxl_dom_suspend.c
index 42c0e0a152e0..55a172a46f87 100644
--- a/tools/libs/light/libxl_dom_suspend.c
+++ b/tools/libs/light/libxl_dom_suspend.c
@@ -321,9 +321,11 @@ static void domain_suspend_common_pvcontrol_suspending(libxl__egc *egc,
     STATE_AO_GC(dsps->ao);
     xs_transaction_t t = 0;
 
-    if (!rc && !domain_suspend_pvcontrol_acked(state))
+    if (!rc && !domain_suspend_pvcontrol_acked(state)) {
         /* keep waiting */
+        LOGD(DEBUG, dsps->domid, "PV control callback without ack");
         return;
+    }
 
     libxl__xswait_stop(gc, &dsps->pvcontrol);
 
@@ -405,7 +407,10 @@ static void domain_suspend_common_wait_guest(libxl__egc *egc,
 static void suspend_common_wait_guest_watch(libxl__egc *egc,
       libxl__ev_xswatch *xsw, const char *watch_path, const char *event_path)
 {
+    EGC_GC;
     libxl__domain_suspend_state *dsps = CONTAINER_OF(xsw, *dsps, guest_watch);
+
+    LOGD(DEBUG, dsps->domid, "@releaseDomain watch fired, checking guest status");
     suspend_common_wait_guest_check(egc, dsps);
 }
 
@@ -440,9 +445,11 @@ static bool suspend_common_wait_guest_check(libxl__egc *egc,
     if (check_guest_status(gc, domid, &info, "suspending"))
         goto err;
 
-    if (!(info.flags & XEN_DOMINF_shutdown))
+    if (!(info.flags & XEN_DOMINF_shutdown)) {
+        LOGD(DEBUG, domid, "guest we were suspending has not shut down yet");
         /* keep waiting */
         return false;
+    }
 
     shutdown_reason = (info.flags >> XEN_DOMINF_shutdownshift)
         & XEN_DOMINF_shutdownmask;
@@ -469,11 +476,14 @@ static void suspend_common_wait_guest_timeout(libxl__egc *egc,
 {
     libxl__domain_suspend_state *dsps = CONTAINER_OF(ev, *dsps, guest_timeout);
     STATE_AO_GC(dsps->ao);
+    LOGD(DEBUG, dsps->domid, "Timeout callback triggered");
     if (suspend_common_wait_guest_check(egc, dsps))
         return;
     if (rc == ERROR_TIMEDOUT) {
         LOGD(ERROR, dsps->domid, "guest did not suspend, timed out");
         rc = ERROR_GUEST_TIMEDOUT;
+    } else {
+        LOGD(ERROR, dsps->domid, "error in timeout handler (code %d)", rc);
     }
     domain_suspend_common_done(egc, dsps, rc);
 }
@@ -628,6 +638,8 @@ void libxl__dm_resume(libxl__egc *egc,
     libxl_domid domid = dmrs->domid;
     libxl__ev_qmp *qmp = &dmrs->qmp;
 
+    LOGD(DEBUG, domid, "Resuming device model");
+
     dm_resume_init(dmrs);
 
     rc = libxl__ev_time_register_rel(dmrs->ao,
@@ -640,6 +652,7 @@ void libxl__dm_resume(libxl__egc *egc,
     case LIBXL_DEVICE_MODEL_VERSION_QEMU_XEN_TRADITIONAL: {
         const char *path, *state;
 
+        LOGD(DEBUG, domid, "Resuming legacy device model: stubdomain ID %" PRIu32, dm_domid);
         path = DEVICE_MODEL_XS_PATH(gc, dm_domid, domid, "/state");
         rc = libxl__xs_read_checked(gc, XBT_NULL, path, &state);
         if (rc) goto out;
@@ -706,6 +719,7 @@ void libxl__dm_resume(libxl__egc *egc,
         goto out;
     }
     default:
+        LOGD(ERROR, domid, "Invalid device model type, cannot resume");
         rc = ERROR_INVAL;
         goto out;
     }
@@ -782,6 +796,8 @@ void libxl__domain_resume(libxl__egc *egc,
     int rc = 0;
     libxl_domain_type type = libxl__domain_type(gc, dmrs->domid);
 
+    LOGD(DEBUG, dmrs->domid, "Resuming domain");
+
     if (type == LIBXL_DOMAIN_TYPE_INVALID) {
         rc = ERROR_FAIL;
         goto out;
diff --git a/tools/libs/light/libxl_domain.c b/tools/libs/light/libxl_domain.c
index 7f0986c18569..f518daada6c9 100644
--- a/tools/libs/light/libxl_domain.c
+++ b/tools/libs/light/libxl_domain.c
@@ -567,6 +567,7 @@ int libxl_domain_suspend_only(libxl_ctx *ctx, uint32_t domid,
     dsps->ao = ao;
     dsps->domid = domid;
     dsps->type = type;
+    LOGD(DEBUG, domid, "Received request to suspend domain");
     rc = libxl__domain_suspend_init(egc, dsps, type);
     if (rc < 0) goto out_err;
     dsps->callback_common_done = domain_suspend_empty_cb;
-- 
2.37.3