diff --git a/mlir/include/mlir/Dialect/ArmSME/Transforms/Passes.h b/mlir/include/mlir/Dialect/ArmSME/Transforms/Passes.h
--- a/mlir/include/mlir/Dialect/ArmSME/Transforms/Passes.h
+++ b/mlir/include/mlir/Dialect/ArmSME/Transforms/Passes.h
@@ -9,6 +9,7 @@
 #ifndef MLIR_DIALECT_ARMSME_TRANSFORMS_PASSES_H
 #define MLIR_DIALECT_ARMSME_TRANSFORMS_PASSES_H
 
+#include "mlir/Conversion/LLVMCommon/TypeConverter.h"
 #include "mlir/Pass/Pass.h"
 
 namespace mlir {
@@ -16,6 +17,9 @@
 class RewritePatternSet;
 
 namespace arm_sme {
+//===----------------------------------------------------------------------===//
+// The EnableArmStreaming pass.
+//===----------------------------------------------------------------------===//
 // Options for Armv9 Streaming SVE mode. By default, streaming-mode is part of
 // the function interface (ABI) and the caller manages PSTATE.SM on entry/exit.
 // In a locally streaming function PSTATE.SM is kept internal and the callee
@@ -33,6 +37,14 @@
 /// Pass that replaces 'arm_sme.get_tile_id' ops with actual tiles.
 std::unique_ptr<Pass> createTileAllocationPass();
 
+//===----------------------------------------------------------------------===//
+// Type ArmSMETypeConverter pass.
+//===----------------------------------------------------------------------===//
+class ArmSMETypeConverter : public LLVMTypeConverter {
+public:
+  ArmSMETypeConverter(MLIRContext *ctx, const LowerToLLVMOptions &options);
+};
+
 //===----------------------------------------------------------------------===//
 // Registration
 //===----------------------------------------------------------------------===//
diff --git a/mlir/lib/Conversion/VectorToLLVM/CMakeLists.txt b/mlir/lib/Conversion/VectorToLLVM/CMakeLists.txt
--- a/mlir/lib/Conversion/VectorToLLVM/CMakeLists.txt
+++ b/mlir/lib/Conversion/VectorToLLVM/CMakeLists.txt
@@ -17,6 +17,7 @@
   MLIRArmNeonDialect
   MLIRArmSMEDialect
   MLIRArmSMETransforms
+  MLIRVectorToArmSME
   MLIRArmSVEDialect
   MLIRArmSVETransforms
   MLIRAMXDialect
diff --git a/mlir/lib/Conversion/VectorToLLVM/ConvertVectorToLLVMPass.cpp b/mlir/lib/Conversion/VectorToLLVM/ConvertVectorToLLVMPass.cpp
--- a/mlir/lib/Conversion/VectorToLLVM/ConvertVectorToLLVMPass.cpp
+++ b/mlir/lib/Conversion/VectorToLLVM/ConvertVectorToLLVMPass.cpp
@@ -15,6 +15,7 @@
 #include "mlir/Dialect/Arith/IR/Arith.h"
 #include "mlir/Dialect/ArmNeon/ArmNeonDialect.h"
 #include "mlir/Dialect/ArmSME/IR/ArmSME.h"
+#include "mlir/Dialect/ArmSME/Transforms/Passes.h"
 #include "mlir/Dialect/ArmSME/Transforms/Transforms.h"
 #include "mlir/Dialect/ArmSVE/ArmSVEDialect.h"
 #include "mlir/Dialect/ArmSVE/Transforms.h"
@@ -96,6 +97,8 @@
   target.addLegalDialect<arith::ArithDialect>();
   target.addLegalDialect<memref::MemRefDialect>();
   target.addLegalOp<UnrealizedConversionCastOp>();
+  arm_sme::ArmSMETypeConverter armSMEConverter(&getContext(), options);
+
   if (armNeon) {
     // TODO: we may or may not want to include in-dialect lowering to
     // LLVM-compatible operations here. So far, all operations in the dialect
@@ -108,7 +111,7 @@
   }
   if (armSME) {
     configureArmSMELegalizeForExportTarget(target);
-    populateArmSMELegalizeForLLVMExportPatterns(converter, patterns);
+    populateArmSMELegalizeForLLVMExportPatterns(armSMEConverter, patterns);
   }
   if (amx) {
     configureAMXLegalizeForExportTarget(target);
diff --git a/mlir/lib/Dialect/ArmSME/Transforms/ArmSMETypeConverter.cpp b/mlir/lib/Dialect/ArmSME/Transforms/ArmSMETypeConverter.cpp
new file mode 100644
--- /dev/null
+++ b/mlir/lib/Dialect/ArmSME/Transforms/ArmSMETypeConverter.cpp
@@ -0,0 +1,22 @@
+//===- ArmSMETypeConverter.cpp - Convert builtin to LLVM dialect types ----===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "mlir/Dialect/ArmSME/Transforms/Passes.h"
+
+using namespace mlir;
+arm_sme::ArmSMETypeConverter::ArmSMETypeConverter(
+    MLIRContext *ctx, const LowerToLLVMOptions &options)
+    : LLVMTypeConverter(ctx, options) {
+  // Disable LLVM type conversion for vectors. This is to prevent 2-d scalable
+  // vectors (common in the context of ArmSME), e.g.
+  //    `vector<[16]x[16]xi8>`,
+  // entering the LLVM Type converter. LLVM does not support arrays of scalable
+  // vectors, but in the case of SME such types are effectively eliminated when
+  // emitting ArmSME LLVM IR intrinsics.
+  addConversion([&](VectorType type) { return type; });
+}
diff --git a/mlir/lib/Dialect/ArmSME/Transforms/CMakeLists.txt b/mlir/lib/Dialect/ArmSME/Transforms/CMakeLists.txt
--- a/mlir/lib/Dialect/ArmSME/Transforms/CMakeLists.txt
+++ b/mlir/lib/Dialect/ArmSME/Transforms/CMakeLists.txt
@@ -1,4 +1,5 @@
 add_mlir_dialect_library(MLIRArmSMETransforms
+  ArmSMETypeConverter.cpp
   EnableArmStreaming.cpp
   LegalizeForLLVMExport.cpp
   TileAllocation.cpp