diff --git a/lib/libc/aarch64/string/Makefile.inc b/lib/libc/aarch64/string/Makefile.inc
--- a/lib/libc/aarch64/string/Makefile.inc
+++ b/lib/libc/aarch64/string/Makefile.inc
@@ -42,7 +42,8 @@
 	memcpy_resolver.c \
 	memmove_resolver.c \
 	memset.S \
-	memset_resolver.c
+	memset_resolver.c \
+	memset_zva64.S
 
 #
 # Add the above functions. Generate an asm file that includes the needed
@@ -77,3 +78,4 @@
 CFLAGS.memchr.S+=-I${SRCTOP}/contrib/arm-optimized-routines/string
 CFLAGS.memcpy.S+=-I${SRCTOP}/contrib/arm-optimized-routines/string
 CFLAGS.memset.S+=-I${SRCTOP}/contrib/arm-optimized-routines/string
+CFLAGS.memset_zva64.S+=-I${SRCTOP}/contrib/arm-optimized-routines/string
diff --git a/lib/libc/aarch64/string/memset_resolver.c b/lib/libc/aarch64/string/memset_resolver.c
--- a/lib/libc/aarch64/string/memset_resolver.c
+++ b/lib/libc/aarch64/string/memset_resolver.c
@@ -25,18 +25,31 @@
  * SUCH DAMAGE.
  */
 #include <sys/types.h>
+
+#include <machine/armreg.h>
 #include <machine/ifunc.h>
 
 #include <elf.h>
 
 void *__memset_aarch64(void *, int, size_t);
+void *__memset_aarch64_zva64(void *, int, size_t);
 void *__memset_aarch64_mops(void *, int, size_t);
 
 DEFINE_UIFUNC(, void *, memset, (void *, int, size_t))
 {
+	uint64_t dczid;
+
 	if (ifunc_arg->_hwcap2 & HWCAP2_MOPS)
 		return (__memset_aarch64_mops);
 
+	/*
+	 * Check for the DC ZVA instruction, and it will
+	 * zero 64 bytes (4 * 4byte words).
+	 */
+	dczid = READ_SPECIALREG(dczid_el0);
+	if ((dczid & DCZID_DZP) == 0 && DCZID_BS_SIZE(dczid) == 4)
+		return (__memset_aarch64_zva64);
+
 	return (__memset_aarch64);
 }
 
diff --git a/lib/libc/aarch64/string/memset_zva64.S b/lib/libc/aarch64/string/memset_zva64.S
new file mode 100644
--- /dev/null
+++ b/lib/libc/aarch64/string/memset_zva64.S
@@ -0,0 +1,4 @@
+/* Used when we know we have a 64-byte dc zva instruction */
+#define	__memset_aarch64	__memset_aarch64_zva64
+#define	SKIP_ZVA_CHECK
+#include "aarch64/memset.S"