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From: Kip Macy <kmacy@FreeBSD.org>
Date: Sun, 19 Oct 2008 01:35:27 +0000 (UTC)
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Subject: svn commit: r184042 - head/sys/kern
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Author: kmacy
Date: Sun Oct 19 01:35:27 2008
New Revision: 184042
URL: http://svn.freebsd.org/changeset/base/184042

Log:
  - Forward port flush of page table updates on context switch or userret
  - Forward port vfork XEN hack

Modified:
  head/sys/kern/kern_fork.c
  head/sys/kern/kern_synch.c
  head/sys/kern/subr_trap.c

Modified: head/sys/kern/kern_fork.c
==============================================================================
--- head/sys/kern/kern_fork.c	Sun Oct 19 01:33:58 2008	(r184041)
+++ head/sys/kern/kern_fork.c	Sun Oct 19 01:35:27 2008	(r184042)
@@ -117,10 +117,15 @@ vfork(td, uap)
 	struct thread *td;
 	struct vfork_args *uap;
 {
-	int error;
+	int error, flags;
 	struct proc *p2;
 
-	error = fork1(td, RFFDG | RFPROC | RFPPWAIT | RFMEM, 0, &p2);
+#ifdef XEN
+	flags = RFFDG | RFPROC; /* validate that this is still an issue */
+#else
+	flags = RFFDG | RFPROC | RFPPWAIT | RFMEM;
+#endif		
+	error = fork1(td, flags, 0, &p2);
 	if (error == 0) {
 		td->td_retval[0] = p2->p_pid;
 		td->td_retval[1] = 0;

Modified: head/sys/kern/kern_synch.c
==============================================================================
--- head/sys/kern/kern_synch.c	Sun Oct 19 01:33:58 2008	(r184041)
+++ head/sys/kern/kern_synch.c	Sun Oct 19 01:35:27 2008	(r184042)
@@ -65,6 +65,12 @@ __FBSDID("$FreeBSD$");
 
 #include <machine/cpu.h>
 
+#ifdef XEN
+#include <vm/vm.h>
+#include <vm/vm_param.h>
+#include <vm/pmap.h>
+#endif
+
 static void synch_setup(void *dummy);
 SYSINIT(synch_setup, SI_SUB_KICK_SCHEDULER, SI_ORDER_FIRST, synch_setup,
     NULL);
@@ -432,6 +438,9 @@ mi_switch(int flags, struct thread *newt
 		    td, td->td_name, td->td_priority,
 		    td->td_inhibitors, td->td_wmesg, td->td_lockname);
 #endif
+#ifdef XEN
+	PT_UPDATES_FLUSH();
+#endif
 	sched_switch(td, newtd, flags);
 	CTR3(KTR_SCHED, "mi_switch: running %p(%s) prio %d",
 	    td, td->td_name, td->td_priority);

Modified: head/sys/kern/subr_trap.c
==============================================================================
--- head/sys/kern/subr_trap.c	Sun Oct 19 01:33:58 2008	(r184041)
+++ head/sys/kern/subr_trap.c	Sun Oct 19 01:35:27 2008	(r184042)
@@ -73,6 +73,12 @@ __FBSDID("$FreeBSD$");
 #include <machine/cpu.h>
 #include <machine/pcb.h>
 
+#ifdef XEN
+#include <vm/vm.h>
+#include <vm/vm_param.h>
+#include <vm/pmap.h>
+#endif
+
 #include <security/mac/mac_framework.h>
 
 /*
@@ -118,6 +124,9 @@ userret(struct thread *td, struct trapfr
 	sched_userret(td);
 	KASSERT(td->td_locks == 0,
 	    ("userret: Returning with %d locks held.", td->td_locks));
+#ifdef XEN
+	PT_UPDATES_FLUSH();
+#endif
 }
 
 /*