Index: sys/arch/sparc64/sparc64/ipifuncs.c
===================================================================
RCS file: /cvsroot/src/sys/arch/sparc64/sparc64/ipifuncs.c,v
retrieving revision 1.50
diff -u -r1.50 ipifuncs.c
--- sys/arch/sparc64/sparc64/ipifuncs.c	8 Jun 2014 17:33:24 -0000	1.50
+++ sys/arch/sparc64/sparc64/ipifuncs.c	1 Nov 2014 18:22:33 -0000
@@ -85,6 +85,9 @@
 #endif
 void	sparc64_ipi_dcache_flush_page_us(void *, void *);
 void	sparc64_ipi_dcache_flush_page_usiii(void *, void *);
+#ifdef SUN4V
+void	sparc64_ipi_dcache_flush_page_sun4v(void *, void *);
+#endif
 void	sparc64_ipi_blast_dcache(void *, void *);
 void	sparc64_ipi_ccall(void *, void *);
 
@@ -491,7 +494,13 @@
 {
 	ipifunc_t func;
 
+#ifdef SUN4V
+	if (CPU_ISSUN4V)
+		func = sparc64_ipi_dcache_flush_page_sun4v;
+	else if (CPU_IS_USIII_UP())
+#else		
 	if (CPU_IS_USIII_UP())
+#endif		
 		func = sparc64_ipi_dcache_flush_page_usiii;
 	else
 		func = sparc64_ipi_dcache_flush_page_us;
Index: sys/arch/sparc64/sparc64/mp_subr.S
===================================================================
RCS file: /cvsroot/src/sys/arch/sparc64/sparc64/mp_subr.S,v
retrieving revision 1.7
diff -u -r1.7 mp_subr.S
--- sys/arch/sparc64/sparc64/mp_subr.S	24 Sep 2014 18:32:10 -0000	1.7
+++ sys/arch/sparc64/sparc64/mp_subr.S	1 Nov 2014 18:22:38 -0000
@@ -389,9 +389,10 @@
 	 nop
 
 /*
- * IPI handler to drop the current FPU state.
+ * Flush data cache page.
  * void sparc64_ipi_dcache_flush_page_usiii(paddr_t pa, int line_size)
  * void sparc64_ipi_dcache_flush_page_us(paddr_t pa, int line_size)
+ * void sparc64_ipi_dcache_flush_page_sun4v(paddr_t pa, int line_size)
  *
  * On entry:
  *	%g2 = pa
@@ -447,4 +448,21 @@
 	ba,a	ret_from_intr_vector
 	 nop
 
+#ifdef SUN4V
+ENTRY(sparc64_ipi_dcache_flush_page_sun4v)
+	set	NBPG, %o1
+	call	hv_mem_sync
+	 mov	%g2, %o0
+	cmp	%o0, 0
+	be,pt	%icc, 1f
+	 nop
+	sir				! crash if hv-call fails
+1:
+	sethi	%hi(KERNBASE), %g5
+	flush	%g5
+	membar	#Sync
+	ba,a	ret_from_intr_vector
+	 nop
+#endif
+		
 #endif