svn commit: r297803 - head/sys/dev/hyperv/vmbus

[Sepherosa Ziehau]

Author: sephe
Date: Mon Apr 11 03:36:07 2016
New Revision: 297803
URL: https://svnweb.freebsd.org/changeset/base/297803

Log:
  hyperv: Resurrect r297481
  
  This time we make sure that the TIME_REF_COUNT MSR exists.
  
  Submitted by:	Jun Su <junsu microsoft com>
  Reviewed by:	sephe, Dexuan Cui <decui microsoft com>
  MFC after:	1 week
  Sponsored by:	Microsoft OSTC

Modified:
  head/sys/dev/hyperv/vmbus/hv_hv.c

Modified: head/sys/dev/hyperv/vmbus/hv_hv.c
==============================================================================
--- head/sys/dev/hyperv/vmbus/hv_hv.c	Mon Apr 11 03:28:17 2016	(r297802)
+++ head/sys/dev/hyperv/vmbus/hv_hv.c	Mon Apr 11 03:36:07 2016	(r297803)
@@ -167,8 +167,6 @@ hv_vmbus_init(void) 
 
 	hv_vmbus_g_context.hypercall_page = virt_addr;
 
-	tc_init(&hv_timecounter); /* register virtual timecount */
-
 	hv_et_init();
 	
 	return (0);
@@ -480,5 +478,10 @@ hyperv_init(void *dummy __unused)
 {
 	if (!hyperv_identify())
 		return;
+
+	if (hyperv_features & HV_FEATURE_MSR_TIME_REFCNT) {
+		/* Register virtual timecount */
+		tc_init(&hv_timecounter);
+	}
 }
 SYSINIT(hyperv_initialize, SI_SUB_HYPERVISOR, SI_ORDER_FIRST, hyperv_init, NULL);