diff --git a/target/riscv/helper.h b/target/riscv/helper.h
index 3c4aa4b5df..4e71738b38 100644
--- a/target/riscv/helper.h
+++ b/target/riscv/helper.h
@@ -1209,3 +1209,7 @@ DEF_HELPER_5(vsm3c_vi, void, ptr, ptr, i32, env, i32)
 
 DEF_HELPER_5(vghsh_vv, void, ptr, ptr, ptr, env, i32)
 DEF_HELPER_4(vgmul_vv, void, ptr, ptr, env, i32)
+
+DEF_HELPER_5(vsm4k_vi, void, ptr, ptr, i32, env, i32)
+DEF_HELPER_4(vsm4r_vv, void, ptr, ptr, env, i32)
+DEF_HELPER_4(vsm4r_vs, void, ptr, ptr, env, i32)
diff --git a/target/riscv/insn32.decode b/target/riscv/insn32.decode
index 856e088bad..543e58ef18 100644
--- a/target/riscv/insn32.decode
+++ b/target/riscv/insn32.decode
@@ -952,3 +952,8 @@ vsm3c_vi        101011 1 ..... ..... 010 ..... 1110111 @r_vm_1
 # *** RV64 Zvkg vector crypto extension ***
 vghsh_vv        101100 1 ..... ..... 010 ..... 1110111 @r_vm_1
 vgmul_vv        101000 1 ..... 10001 010 ..... 1110111 @r2_vm_1
+
+# *** RV64 Zvksed vector crypto extension ***
+vsm4k_vi        100001 1 ..... ..... 010 ..... 1110111 @r_vm_1
+vsm4r_vv        101000 1 ..... 10000 010 ..... 1110111 @r2_vm_1
+vsm4r_vs        101001 1 ..... 10000 010 ..... 1110111 @r2_vm_1
diff --git a/target/riscv/insn_trans/trans_rvzvksed.c.inc b/target/riscv/insn_trans/trans_rvzvksed.c.inc
new file mode 100644
index 0000000000..0025919fdb
--- /dev/null
+++ b/target/riscv/insn_trans/trans_rvzvksed.c.inc
@@ -0,0 +1,57 @@
+/*
+ * RISC-V translation routines for the Zvksed Extension.
+ *
+ * Copyright (C) 2023 SiFive, Inc.
+ * Written by Codethink Ltd and SiFive.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2 or later, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#define ZVKSED_EGS 4
+
+static bool zvksed_check(DisasContext *s)
+{
+    return s->cfg_ptr->ext_zvksed == true &&
+           require_rvv(s) &&
+           vext_check_isa_ill(s) &&
+           MAXSZ(s) >= (128 / 8) && /* EGW in bytes */
+           s->vstart % ZVKSED_EGS == 0 &&
+           s->sew == MO_32;
+}
+
+static bool vsm4k_vi_check(DisasContext *s, arg_rmrr *a)
+{
+    return zvksed_check(s) &&
+           require_align(a->rd, s->lmul) &&
+           require_align(a->rs2, s->lmul);
+}
+
+GEN_VI_UNMASKED_TRANS(vsm4k_vi, vsm4k_vi_check, ZVKSED_EGS)
+
+static bool vsm4r_vv_check(DisasContext *s, arg_rmr *a)
+{
+    return zvksed_check(s) &&
+           require_align(a->rd, s->lmul) &&
+           require_align(a->rs2, s->lmul);
+}
+
+GEN_V_UNMASKED_TRANS(vsm4r_vv, vsm4r_vv_check)
+
+static bool vsm4r_vs_check(DisasContext *s, arg_rmr *a)
+{
+    return zvksed_check(s) &&
+           !is_overlapped(a->rd, 1 << MAX(s->lmul, 0), a->rs2, 1) &&
+           require_align(a->rd, s->lmul);
+}
+
+GEN_V_UNMASKED_TRANS(vsm4r_vs, vsm4r_vs_check)
diff --git a/target/riscv/translate.c b/target/riscv/translate.c
index fdb5c3364e..521bc2e3a9 100644
--- a/target/riscv/translate.c
+++ b/target/riscv/translate.c
@@ -1088,6 +1088,7 @@ static uint32_t opcode_at(DisasContextBase *dcbase, target_ulong pc)
 #include "insn_trans/trans_rvzvknh.c.inc"
 #include "insn_trans/trans_rvzvksh.c.inc"
 #include "insn_trans/trans_rvzvkg.c.inc"
+#include "insn_trans/trans_rvzvksed.c.inc"
 #include "insn_trans/trans_privileged.c.inc"
 #include "insn_trans/trans_svinval.c.inc"
 #include "decode-xthead.c.inc"
diff --git a/target/riscv/vcrypto_helper.c b/target/riscv/vcrypto_helper.c
index fe9b05253d..63af768e2e 100644
--- a/target/riscv/vcrypto_helper.c
+++ b/target/riscv/vcrypto_helper.c
@@ -23,6 +23,7 @@
 #include "qemu/bswap.h"
 #include "cpu.h"
 #include "crypto/aes.h"
+#include "crypto/sm4.h"
 #include "exec/memop.h"
 #include "exec/exec-all.h"
 #include "exec/helper-proto.h"
@@ -872,3 +873,129 @@ void HELPER(vgmul_vv)(void *vd_vptr, void *vs2_vptr,
     vext_set_elems_1s(vd, vta, env->vl * 4, total_elems * 4);
     env->vstart = 0;
 }
+
+void HELPER(vsm4k_vi)(void *vd, void *vs2, uint32_t uimm5,
+                      CPURISCVState *env, uint32_t desc)
+{
+    const uint32_t egs = 4;
+    uint32_t rnd = uimm5 & 0x7;
+    uint32_t group_start = env->vstart / egs;
+    uint32_t group_end = env->vl / egs;
+    uint32_t esz = sizeof(uint32_t);
+    uint32_t total_elems = vext_get_total_elems(env, desc, esz);
+
+    for (uint32_t i = group_start; i < group_end; ++i) {
+        uint32_t vstart = i * egs;
+        uint32_t vend = (i + 1) * egs;
+        uint32_t rk[4] = {0};
+        uint32_t tmp[8] = {0};
+
+        for (uint32_t j = vstart; j < vend; ++j) {
+            rk[j - vstart] = *((uint32_t *)vs2 + H4(j));
+        }
+
+        for (uint32_t j = 0; j < egs; ++j) {
+            tmp[j] = rk[j];
+        }
+
+        for (uint32_t j = 0; j < egs; ++j) {
+            uint32_t b, s;
+            b = tmp[j + 1] ^ tmp[j + 2] ^ tmp[j + 3] ^ sm4_ck[rnd * 4 + j];
+
+            s = sm4_subword(b);
+
+            tmp[j + 4] = tmp[j] ^ (s ^ rol32(s, 13) ^ rol32(s, 23));
+        }
+
+        for (uint32_t j = vstart; j < vend; ++j) {
+            *((uint32_t *)vd + H4(j)) = tmp[egs + (j - vstart)];
+        }
+    }
+
+    env->vstart = 0;
+    /* set tail elements to 1s */
+    vext_set_elems_1s(vd, vext_vta(desc), env->vl * esz, total_elems * esz);
+}
+
+static void do_sm4_round(uint32_t *rk, uint32_t *buf)
+{
+    const uint32_t egs = 4;
+    uint32_t s, b;
+
+    for (uint32_t j = egs; j < egs * 2; ++j) {
+        b = buf[j - 3] ^ buf[j - 2] ^ buf[j - 1] ^ rk[j - 4];
+
+        s = sm4_subword(b);
+
+        buf[j] = buf[j - 4] ^ (s ^ rol32(s, 2) ^ rol32(s, 10) ^
+                rol32(s, 18) ^ rol32(s, 24));
+    }
+}
+
+void HELPER(vsm4r_vv)(void *vd, void *vs2, CPURISCVState *env, uint32_t desc)
+{
+    const uint32_t egs = 4;
+    uint32_t group_start = env->vstart / egs;
+    uint32_t group_end = env->vl / egs;
+    uint32_t esz = sizeof(uint32_t);
+    uint32_t total_elems = vext_get_total_elems(env, desc, esz);
+
+    for (uint32_t i = group_start; i < group_end; ++i) {
+        uint32_t vstart = i * egs;
+        uint32_t vend = (i + 1) * egs;
+        uint32_t rk[4] = {0};
+        uint32_t tmp[8] = {0};
+
+        for (uint32_t j = vstart; j < vend; ++j) {
+            rk[j - vstart] = *((uint32_t *)vs2 + H4(j));
+        }
+
+        for (uint32_t j = vstart; j < vend; ++j) {
+            tmp[j - vstart] = *((uint32_t *)vd + H4(j));
+        }
+
+        do_sm4_round(rk, tmp);
+
+        for (uint32_t j = vstart; j < vend; ++j) {
+            *((uint32_t *)vd + H4(j)) = tmp[egs + (j - vstart)];
+        }
+    }
+
+    env->vstart = 0;
+    /* set tail elements to 1s */
+    vext_set_elems_1s(vd, vext_vta(desc), env->vl * esz, total_elems * esz);
+}
+
+void HELPER(vsm4r_vs)(void *vd, void *vs2, CPURISCVState *env, uint32_t desc)
+{
+    const uint32_t egs = 4;
+    uint32_t group_start = env->vstart / egs;
+    uint32_t group_end = env->vl / egs;
+    uint32_t esz = sizeof(uint32_t);
+    uint32_t total_elems = vext_get_total_elems(env, desc, esz);
+
+    for (uint32_t i = group_start; i < group_end; ++i) {
+        uint32_t vstart = i * egs;
+        uint32_t vend = (i + 1) * egs;
+        uint32_t rk[4] = {0};
+        uint32_t tmp[8] = {0};
+
+        for (uint32_t j = 0; j < egs; ++j) {
+            rk[j] = *((uint32_t *)vs2 + H4(j));
+        }
+
+        for (uint32_t j = vstart; j < vend; ++j) {
+            tmp[j - vstart] = *((uint32_t *)vd + H4(j));
+        }
+
+        do_sm4_round(rk, tmp);
+
+        for (uint32_t j = vstart; j < vend; ++j) {
+            *((uint32_t *)vd + H4(j)) = tmp[egs + (j - vstart)];
+        }
+    }
+
+    env->vstart = 0;
+    /* set tail elements to 1s */
+    vext_set_elems_1s(vd, vext_vta(desc), env->vl * esz, total_elems * esz);
+}
