diff --git a/bfd/elfxx-riscv.c b/bfd/elfxx-riscv.c
index adcc606fe7e..0ec2552bfb9 100644
--- a/bfd/elfxx-riscv.c
+++ b/bfd/elfxx-riscv.c
@@ -1265,6 +1265,7 @@ static struct riscv_supported_ext riscv_supported_std_z_ext[] =
   {"zvkned",		ISA_SPEC_CLASS_DRAFT,		1, 0,  0 },
   {"zvknha",		ISA_SPEC_CLASS_DRAFT,		1, 0,  0 },
   {"zvknhb",		ISA_SPEC_CLASS_DRAFT,		1, 0,  0 },
+  {"zvksed",		ISA_SPEC_CLASS_DRAFT,		1, 0,  0 },
   {"zvl32b",		ISA_SPEC_CLASS_DRAFT,		1, 0,  0 },
   {"zvl64b",		ISA_SPEC_CLASS_DRAFT,		1, 0,  0 },
   {"zvl128b",		ISA_SPEC_CLASS_DRAFT,		1, 0,  0 },
@@ -2432,6 +2433,8 @@ riscv_multi_subset_supports (riscv_parse_subset_t *rps,
     case INSN_CLASS_ZVKNHA_OR_ZVKNHB:
       return (riscv_subset_supports (rps, "zvknha")
 	      || riscv_subset_supports (rps, "zvknhb"));
+    case INSN_CLASS_ZVKSED:
+      return riscv_subset_supports (rps, "zvksed");
     case INSN_CLASS_SVINVAL:
       return riscv_subset_supports (rps, "svinval");
     case INSN_CLASS_H:
@@ -2604,6 +2607,8 @@ riscv_multi_subset_supports_ext (riscv_parse_subset_t *rps,
       return _("zvknha");
     case INSN_CLASS_ZVKNHB:
       return _("zvknhb");
+    case INSN_CLASS_ZVKSED:
+      return _("zvksed");
     case INSN_CLASS_SVINVAL:
       return "svinval";
     case INSN_CLASS_H:
diff --git a/gas/testsuite/gas/riscv/zvksed.d b/gas/testsuite/gas/riscv/zvksed.d
new file mode 100644
index 00000000000..48b4aafdbb1
--- /dev/null
+++ b/gas/testsuite/gas/riscv/zvksed.d
@@ -0,0 +1,12 @@
+#as: -march=rv64gc_zvksed
+#objdump: -dr
+
+.*:[ 	]+file format .*
+
+
+Disassembly of section .text:
+0+000 <.text>:
+[ 	]+[0-9a-f]+:[ 	]+86802277[ 	]+vsm4k.vi[ 	]+v4,v8,0
+[ 	]+[0-9a-f]+:[ 	]+8683a277[ 	]+vsm4k.vi[ 	]+v4,v8,7
+[ 	]+[0-9a-f]+:[ 	]+a2882277[ 	]+vsm4r.vv[ 	]+v4,v8
+[ 	]+[0-9a-f]+:[ 	]+a6882277[ 	]+vsm4r.vs[ 	]+v4,v8
diff --git a/gas/testsuite/gas/riscv/zvksed.s b/gas/testsuite/gas/riscv/zvksed.s
new file mode 100644
index 00000000000..754b4646adf
--- /dev/null
+++ b/gas/testsuite/gas/riscv/zvksed.s
@@ -0,0 +1,4 @@
+	vsm4k.vi v4, v8, 0
+	vsm4k.vi v4, v8, 7
+	vsm4r.vv v4, v8
+	vsm4r.vs v4, v8
diff --git a/include/opcode/riscv-opc.h b/include/opcode/riscv-opc.h
index 5590dc3b014..415930d0e3e 100644
--- a/include/opcode/riscv-opc.h
+++ b/include/opcode/riscv-opc.h
@@ -2132,6 +2132,13 @@
 #define MASK_VSHA2CL_VV 0xfe00707f
 #define MATCH_VSHA2MS_VV 0xb6002077
 #define MASK_VSHA2MS_VV 0xfe00707f
+/* Zvksed instructions.  */
+#define MATCH_VSM4K_VI 0x86002077
+#define MASK_VSM4K_VI 0xfe00707f
+#define MATCH_VSM4R_VS 0xa6082077
+#define MASK_VSM4R_VS 0xfe0ff07f
+#define MATCH_VSM4R_VV 0xa2082077
+#define MASK_VSM4R_VV 0xfe0ff07f
 /* Svinval instruction.  */
 #define MATCH_SINVAL_VMA 0x16000073
 #define MASK_SINVAL_VMA 0xfe007fff
@@ -3241,6 +3248,10 @@ DECLARE_INSN(vaesz_vs, MATCH_VAESZ_VS, MASK_VAESZ_VS)
 DECLARE_INSN(vsha2ch_vv, MATCH_VSHA2CH_VV, MASK_VSHA2CH_VV)
 DECLARE_INSN(vsha2cl_vv, MATCH_VSHA2CL_VV, MASK_VSHA2CL_VV)
 DECLARE_INSN(vsha2ms_vv, MATCH_VSHA2MS_VV, MASK_VSHA2MS_VV)
+/* Zvksed instructions.  */
+DECLARE_INSN(vsm4k_vi, MATCH_VSM4K_VI, MASK_VSM4K_VI)
+DECLARE_INSN(vsm4r_vs, MATCH_VSM4R_VS, MASK_VSM4R_VS)
+DECLARE_INSN(vsm4r_vv, MATCH_VSM4R_VV, MASK_VSM4R_VV)
 /* Vendor-specific (T-Head) XTheadBa instructions.  */
 DECLARE_INSN(th_addsl, MATCH_TH_ADDSL, MASK_TH_ADDSL)
 /* Vendor-specific (T-Head) XTheadBb instructions.  */
diff --git a/include/opcode/riscv.h b/include/opcode/riscv.h
index 4ceb191ab07..df807fe8f79 100644
--- a/include/opcode/riscv.h
+++ b/include/opcode/riscv.h
@@ -416,6 +416,7 @@ enum riscv_insn_class
   INSN_CLASS_ZVKNHA,
   INSN_CLASS_ZVKNHB,
   INSN_CLASS_ZVKNHA_OR_ZVKNHB,
+  INSN_CLASS_ZVKSED,
   INSN_CLASS_SVINVAL,
   INSN_CLASS_ZICBOM,
   INSN_CLASS_ZICBOP,
diff --git a/opcodes/riscv-opc.c b/opcodes/riscv-opc.c
index d7d3f1c1cd2..cb164169f92 100644
--- a/opcodes/riscv-opc.c
+++ b/opcodes/riscv-opc.c
@@ -1861,6 +1861,11 @@ const struct riscv_opcode riscv_opcodes[] =
 {"vsha2cl.vv",  0, INSN_CLASS_ZVKNHA_OR_ZVKNHB, "Vd,Vt,Vs", MATCH_VSHA2CL_VV, MASK_VSHA2CL_VV, match_opcode, 0},
 {"vsha2ms.vv",  0, INSN_CLASS_ZVKNHA_OR_ZVKNHB, "Vd,Vt,Vs", MATCH_VSHA2MS_VV, MASK_VSHA2MS_VV, match_opcode, 0},
 
+/* Zvksed instructions.  */
+{"vsm4k.vi",     0, INSN_CLASS_ZVKSED, "Vd,Vt,Vj", MATCH_VSM4K_VI, MASK_VSM4K_VI, match_opcode, 0},
+{"vsm4r.vv",     0, INSN_CLASS_ZVKSED, "Vd,Vt", MATCH_VSM4R_VV, MASK_VSM4R_VV, match_opcode, 0},
+{"vsm4r.vs",     0, INSN_CLASS_ZVKSED, "Vd,Vt", MATCH_VSM4R_VS, MASK_VSM4R_VS, match_opcode, 0},
+
 /* Supervisor instructions.  */
 {"csrr",       0, INSN_CLASS_ZICSR, "d,E",   MATCH_CSRRS, MASK_CSRRS|MASK_RS1, match_opcode, INSN_ALIAS },
 {"csrw",       0, INSN_CLASS_ZICSR, "E,s",   MATCH_CSRRW, MASK_CSRRW|MASK_RD, match_opcode, INSN_ALIAS },
