diff --git a/crypto/block-luks.c b/crypto/block-luks.c
index 63649f1..fcf3b04 100644
--- a/crypto/block-luks.c
+++ b/crypto/block-luks.c
@@ -776,6 +776,11 @@ qcrypto_block_luks_open(QCryptoBlock *block,
     }
 
     if (ivalg == QCRYPTO_IVGEN_ALG_ESSIV) {
+        if (!ivhash_name) {
+            ret = -EINVAL;
+            error_setg(errp, "Missing IV generator hash specification");
+            goto fail;
+        }
         ivcipheralg = qcrypto_block_luks_essiv_cipher(cipheralg,
                                                       ivhash,
                                                       &local_err);
@@ -785,6 +790,13 @@ qcrypto_block_luks_open(QCryptoBlock *block,
             goto fail;
         }
     } else {
+        /* Note we parsed the ivhash_name earlier in the cipher_mode
+         * spec string even with plain/plain64 ivgens, but we
+         * will ignore it, since it is irrelevant for these ivgens.
+         * This is for compat with dm-crypt which will silently
+         * ignore hash names with these ivgens rather than report
+         * an error about the invalid usage
+         */
         ivcipheralg = cipheralg;
     }
 
@@ -904,6 +916,15 @@ qcrypto_block_luks_create(QCryptoBlock *block,
     if (!luks_opts.has_hash_alg) {
         luks_opts.hash_alg = QCRYPTO_HASH_ALG_SHA256;
     }
+    if (luks_opts.ivgen_alg == QCRYPTO_IVGEN_ALG_ESSIV) {
+        if (!luks_opts.has_ivgen_hash_alg) {
+            luks_opts.ivgen_hash_alg = QCRYPTO_HASH_ALG_SHA256;
+            luks_opts.has_ivgen_hash_alg = true;
+        }
+    }
+    /* Note we're allowing ivgen_hash_alg to be set even for
+     * non-essiv iv generators that don't need a hash. It will
+     * be silently ignored, for compatibility with dm-crypt */
 
     if (!options->u.luks.key_secret) {
         error_setg(errp, "Parameter 'key-secret' is required for cipher");
diff --git a/tests/qemu-iotests/149 b/tests/qemu-iotests/149
index 52e23d2..8407251 100755
--- a/tests/qemu-iotests/149
+++ b/tests/qemu-iotests/149
@@ -153,6 +153,8 @@ def cryptsetup_format(config):
     cipher = config.cipher + "-" + config.mode + "-" + config.ivgen
     if config.ivgen_hash is not None:
         cipher = cipher + ":" + config.ivgen_hash
+    elif config.ivgen == "essiv":
+        cipher = cipher + ":" + "sha256"
     args.extend(["--cipher", cipher])
     if config.mode == "xts":
         args.extend(["--key-size", str(config.keylen * 2)])
@@ -479,6 +481,16 @@ configs = [
                    "6": "slot6",
                    "7": "slot7",
                }),
+
+    # Check handling of default hash alg (sha256) with essiv
+    LUKSConfig("aes-256-cbc-essiv-auto-sha1",
+               "aes", 256, "cbc", "essiv", None, "sha1"),
+
+    # Check that a useless hash provided for 'plain64' iv gen
+    # is ignored and no error raised
+    LUKSConfig("aes-256-cbc-plain64-sha256-sha1",
+               "aes", 256, "cbc", "plain64", "sha256", "sha1"),
+
 ]
 
 blacklist = [
diff --git a/tests/qemu-iotests/149.out b/tests/qemu-iotests/149.out
index 287f013..90b5b55 100644
--- a/tests/qemu-iotests/149.out
+++ b/tests/qemu-iotests/149.out
@@ -1878,3 +1878,243 @@ sudo cryptsetup -q -v luksClose qiotest-145-aes-256-xts-plain-sha1-pwallslots
 # Delete image
 unlink TEST_DIR/luks-aes-256-xts-plain-sha1-pwallslots.img
 
+# ================= dm-crypt aes-256-cbc-essiv-auto-sha1 =================
+# Create image
+truncate TEST_DIR/luks-aes-256-cbc-essiv-auto-sha1.img --size 4194304MB
+# Format image
+sudo cryptsetup -q -v luksFormat --cipher aes-cbc-essiv:sha256 --key-size 256 --hash sha1 --key-slot 0 --key-file - TEST_DIR/luks-aes-256-cbc-essiv-auto-sha1.img
+# Open dev
+sudo cryptsetup -q -v luksOpen TEST_DIR/luks-aes-256-cbc-essiv-auto-sha1.img qiotest-145-aes-256-cbc-essiv-auto-sha1
+# Set dev owner
+sudo chown UID:GID /dev/mapper/qiotest-145-aes-256-cbc-essiv-auto-sha1
+# Write test pattern 0xa7
+qemu-io -c write -P 0xa7 100M 10M --image-opts driver=file,filename=/dev/mapper/qiotest-145-aes-256-cbc-essiv-auto-sha1
+wrote 10485760/10485760 bytes at offset 104857600
+10 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+
+# Write test pattern 0x13
+qemu-io -c write -P 0x13 3145728M 10M --image-opts driver=file,filename=/dev/mapper/qiotest-145-aes-256-cbc-essiv-auto-sha1
+wrote 10485760/10485760 bytes at offset 3298534883328
+10 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+
+# Close dev
+sudo cryptsetup -q -v luksClose qiotest-145-aes-256-cbc-essiv-auto-sha1
+# Read test pattern 0xa7
+qemu-io -c read -P 0xa7 100M 10M --object secret,id=sec0,data=MTIzNDU2,format=base64 --image-opts driver=luks,key-secret=sec0,file.filename=TEST_DIR/luks-aes-256-cbc-essiv-auto-sha1.img
+read 10485760/10485760 bytes at offset 104857600
+10 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+
+# Read test pattern 0x13
+qemu-io -c read -P 0x13 3145728M 10M --object secret,id=sec0,data=MTIzNDU2,format=base64 --image-opts driver=luks,key-secret=sec0,file.filename=TEST_DIR/luks-aes-256-cbc-essiv-auto-sha1.img
+read 10485760/10485760 bytes at offset 3298534883328
+10 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+
+# Write test pattern 0x91
+qemu-io -c write -P 0x91 100M 10M --object secret,id=sec0,data=MTIzNDU2,format=base64 --image-opts driver=luks,key-secret=sec0,file.filename=TEST_DIR/luks-aes-256-cbc-essiv-auto-sha1.img
+wrote 10485760/10485760 bytes at offset 104857600
+10 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+
+# Write test pattern 0x5e
+qemu-io -c write -P 0x5e 3145728M 10M --object secret,id=sec0,data=MTIzNDU2,format=base64 --image-opts driver=luks,key-secret=sec0,file.filename=TEST_DIR/luks-aes-256-cbc-essiv-auto-sha1.img
+wrote 10485760/10485760 bytes at offset 3298534883328
+10 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+
+# Open dev
+sudo cryptsetup -q -v luksOpen TEST_DIR/luks-aes-256-cbc-essiv-auto-sha1.img qiotest-145-aes-256-cbc-essiv-auto-sha1
+# Set dev owner
+sudo chown UID:GID /dev/mapper/qiotest-145-aes-256-cbc-essiv-auto-sha1
+# Read test pattern 0x91
+qemu-io -c read -P 0x91 100M 10M --image-opts driver=file,filename=/dev/mapper/qiotest-145-aes-256-cbc-essiv-auto-sha1
+read 10485760/10485760 bytes at offset 104857600
+10 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+
+# Read test pattern 0x5e
+qemu-io -c read -P 0x5e 3145728M 10M --image-opts driver=file,filename=/dev/mapper/qiotest-145-aes-256-cbc-essiv-auto-sha1
+read 10485760/10485760 bytes at offset 3298534883328
+10 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+
+# Close dev
+sudo cryptsetup -q -v luksClose qiotest-145-aes-256-cbc-essiv-auto-sha1
+# Delete image
+unlink TEST_DIR/luks-aes-256-cbc-essiv-auto-sha1.img
+
+# ================= qemu-img aes-256-cbc-essiv-auto-sha1 =================
+# Create image
+qemu-img create -f luks --object secret,id=sec0,data=MTIzNDU2,format=base64 -o key-secret=sec0,cipher-alg=aes-256,cipher-mode=cbc,ivgen-alg=essiv,hash-alg=sha1 TEST_DIR/luks-aes-256-cbc-essiv-auto-sha1.img 4194304M
+Formatting 'TEST_DIR/luks-aes-256-cbc-essiv-auto-sha1.img', fmt=luks size=4398046511104 key-secret=sec0 cipher-alg=aes-256 cipher-mode=cbc ivgen-alg=essiv hash-alg=sha1
+
+# Open dev
+sudo cryptsetup -q -v luksOpen TEST_DIR/luks-aes-256-cbc-essiv-auto-sha1.img qiotest-145-aes-256-cbc-essiv-auto-sha1
+# Set dev owner
+sudo chown UID:GID /dev/mapper/qiotest-145-aes-256-cbc-essiv-auto-sha1
+# Write test pattern 0xa7
+qemu-io -c write -P 0xa7 100M 10M --image-opts driver=file,filename=/dev/mapper/qiotest-145-aes-256-cbc-essiv-auto-sha1
+wrote 10485760/10485760 bytes at offset 104857600
+10 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+
+# Write test pattern 0x13
+qemu-io -c write -P 0x13 3145728M 10M --image-opts driver=file,filename=/dev/mapper/qiotest-145-aes-256-cbc-essiv-auto-sha1
+wrote 10485760/10485760 bytes at offset 3298534883328
+10 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+
+# Close dev
+sudo cryptsetup -q -v luksClose qiotest-145-aes-256-cbc-essiv-auto-sha1
+# Read test pattern 0xa7
+qemu-io -c read -P 0xa7 100M 10M --object secret,id=sec0,data=MTIzNDU2,format=base64 --image-opts driver=luks,key-secret=sec0,file.filename=TEST_DIR/luks-aes-256-cbc-essiv-auto-sha1.img
+read 10485760/10485760 bytes at offset 104857600
+10 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+
+# Read test pattern 0x13
+qemu-io -c read -P 0x13 3145728M 10M --object secret,id=sec0,data=MTIzNDU2,format=base64 --image-opts driver=luks,key-secret=sec0,file.filename=TEST_DIR/luks-aes-256-cbc-essiv-auto-sha1.img
+read 10485760/10485760 bytes at offset 3298534883328
+10 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+
+# Write test pattern 0x91
+qemu-io -c write -P 0x91 100M 10M --object secret,id=sec0,data=MTIzNDU2,format=base64 --image-opts driver=luks,key-secret=sec0,file.filename=TEST_DIR/luks-aes-256-cbc-essiv-auto-sha1.img
+wrote 10485760/10485760 bytes at offset 104857600
+10 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+
+# Write test pattern 0x5e
+qemu-io -c write -P 0x5e 3145728M 10M --object secret,id=sec0,data=MTIzNDU2,format=base64 --image-opts driver=luks,key-secret=sec0,file.filename=TEST_DIR/luks-aes-256-cbc-essiv-auto-sha1.img
+wrote 10485760/10485760 bytes at offset 3298534883328
+10 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+
+# Open dev
+sudo cryptsetup -q -v luksOpen TEST_DIR/luks-aes-256-cbc-essiv-auto-sha1.img qiotest-145-aes-256-cbc-essiv-auto-sha1
+# Set dev owner
+sudo chown UID:GID /dev/mapper/qiotest-145-aes-256-cbc-essiv-auto-sha1
+# Read test pattern 0x91
+qemu-io -c read -P 0x91 100M 10M --image-opts driver=file,filename=/dev/mapper/qiotest-145-aes-256-cbc-essiv-auto-sha1
+read 10485760/10485760 bytes at offset 104857600
+10 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+
+# Read test pattern 0x5e
+qemu-io -c read -P 0x5e 3145728M 10M --image-opts driver=file,filename=/dev/mapper/qiotest-145-aes-256-cbc-essiv-auto-sha1
+read 10485760/10485760 bytes at offset 3298534883328
+10 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+
+# Close dev
+sudo cryptsetup -q -v luksClose qiotest-145-aes-256-cbc-essiv-auto-sha1
+# Delete image
+unlink TEST_DIR/luks-aes-256-cbc-essiv-auto-sha1.img
+
+# ================= dm-crypt aes-256-cbc-plain64-sha256-sha1 =================
+# Create image
+truncate TEST_DIR/luks-aes-256-cbc-plain64-sha256-sha1.img --size 4194304MB
+# Format image
+sudo cryptsetup -q -v luksFormat --cipher aes-cbc-plain64:sha256 --key-size 256 --hash sha1 --key-slot 0 --key-file - TEST_DIR/luks-aes-256-cbc-plain64-sha256-sha1.img
+# Open dev
+sudo cryptsetup -q -v luksOpen TEST_DIR/luks-aes-256-cbc-plain64-sha256-sha1.img qiotest-145-aes-256-cbc-plain64-sha256-sha1
+# Set dev owner
+sudo chown UID:GID /dev/mapper/qiotest-145-aes-256-cbc-plain64-sha256-sha1
+# Write test pattern 0xa7
+qemu-io -c write -P 0xa7 100M 10M --image-opts driver=file,filename=/dev/mapper/qiotest-145-aes-256-cbc-plain64-sha256-sha1
+wrote 10485760/10485760 bytes at offset 104857600
+10 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+
+# Write test pattern 0x13
+qemu-io -c write -P 0x13 3145728M 10M --image-opts driver=file,filename=/dev/mapper/qiotest-145-aes-256-cbc-plain64-sha256-sha1
+wrote 10485760/10485760 bytes at offset 3298534883328
+10 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+
+# Close dev
+sudo cryptsetup -q -v luksClose qiotest-145-aes-256-cbc-plain64-sha256-sha1
+# Read test pattern 0xa7
+qemu-io -c read -P 0xa7 100M 10M --object secret,id=sec0,data=MTIzNDU2,format=base64 --image-opts driver=luks,key-secret=sec0,file.filename=TEST_DIR/luks-aes-256-cbc-plain64-sha256-sha1.img
+read 10485760/10485760 bytes at offset 104857600
+10 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+
+# Read test pattern 0x13
+qemu-io -c read -P 0x13 3145728M 10M --object secret,id=sec0,data=MTIzNDU2,format=base64 --image-opts driver=luks,key-secret=sec0,file.filename=TEST_DIR/luks-aes-256-cbc-plain64-sha256-sha1.img
+read 10485760/10485760 bytes at offset 3298534883328
+10 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+
+# Write test pattern 0x91
+qemu-io -c write -P 0x91 100M 10M --object secret,id=sec0,data=MTIzNDU2,format=base64 --image-opts driver=luks,key-secret=sec0,file.filename=TEST_DIR/luks-aes-256-cbc-plain64-sha256-sha1.img
+wrote 10485760/10485760 bytes at offset 104857600
+10 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+
+# Write test pattern 0x5e
+qemu-io -c write -P 0x5e 3145728M 10M --object secret,id=sec0,data=MTIzNDU2,format=base64 --image-opts driver=luks,key-secret=sec0,file.filename=TEST_DIR/luks-aes-256-cbc-plain64-sha256-sha1.img
+wrote 10485760/10485760 bytes at offset 3298534883328
+10 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+
+# Open dev
+sudo cryptsetup -q -v luksOpen TEST_DIR/luks-aes-256-cbc-plain64-sha256-sha1.img qiotest-145-aes-256-cbc-plain64-sha256-sha1
+# Set dev owner
+sudo chown UID:GID /dev/mapper/qiotest-145-aes-256-cbc-plain64-sha256-sha1
+# Read test pattern 0x91
+qemu-io -c read -P 0x91 100M 10M --image-opts driver=file,filename=/dev/mapper/qiotest-145-aes-256-cbc-plain64-sha256-sha1
+read 10485760/10485760 bytes at offset 104857600
+10 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+
+# Read test pattern 0x5e
+qemu-io -c read -P 0x5e 3145728M 10M --image-opts driver=file,filename=/dev/mapper/qiotest-145-aes-256-cbc-plain64-sha256-sha1
+read 10485760/10485760 bytes at offset 3298534883328
+10 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+
+# Close dev
+sudo cryptsetup -q -v luksClose qiotest-145-aes-256-cbc-plain64-sha256-sha1
+# Delete image
+unlink TEST_DIR/luks-aes-256-cbc-plain64-sha256-sha1.img
+
+# ================= qemu-img aes-256-cbc-plain64-sha256-sha1 =================
+# Create image
+qemu-img create -f luks --object secret,id=sec0,data=MTIzNDU2,format=base64 -o key-secret=sec0,cipher-alg=aes-256,cipher-mode=cbc,ivgen-alg=plain64,hash-alg=sha1,ivgen-hash-alg=sha256 TEST_DIR/luks-aes-256-cbc-plain64-sha256-sha1.img 4194304M
+Formatting 'TEST_DIR/luks-aes-256-cbc-plain64-sha256-sha1.img', fmt=luks size=4398046511104 key-secret=sec0 cipher-alg=aes-256 cipher-mode=cbc ivgen-alg=plain64 ivgen-hash-alg=sha256 hash-alg=sha1
+
+# Open dev
+sudo cryptsetup -q -v luksOpen TEST_DIR/luks-aes-256-cbc-plain64-sha256-sha1.img qiotest-145-aes-256-cbc-plain64-sha256-sha1
+# Set dev owner
+sudo chown UID:GID /dev/mapper/qiotest-145-aes-256-cbc-plain64-sha256-sha1
+# Write test pattern 0xa7
+qemu-io -c write -P 0xa7 100M 10M --image-opts driver=file,filename=/dev/mapper/qiotest-145-aes-256-cbc-plain64-sha256-sha1
+wrote 10485760/10485760 bytes at offset 104857600
+10 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+
+# Write test pattern 0x13
+qemu-io -c write -P 0x13 3145728M 10M --image-opts driver=file,filename=/dev/mapper/qiotest-145-aes-256-cbc-plain64-sha256-sha1
+wrote 10485760/10485760 bytes at offset 3298534883328
+10 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+
+# Close dev
+sudo cryptsetup -q -v luksClose qiotest-145-aes-256-cbc-plain64-sha256-sha1
+# Read test pattern 0xa7
+qemu-io -c read -P 0xa7 100M 10M --object secret,id=sec0,data=MTIzNDU2,format=base64 --image-opts driver=luks,key-secret=sec0,file.filename=TEST_DIR/luks-aes-256-cbc-plain64-sha256-sha1.img
+read 10485760/10485760 bytes at offset 104857600
+10 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+
+# Read test pattern 0x13
+qemu-io -c read -P 0x13 3145728M 10M --object secret,id=sec0,data=MTIzNDU2,format=base64 --image-opts driver=luks,key-secret=sec0,file.filename=TEST_DIR/luks-aes-256-cbc-plain64-sha256-sha1.img
+read 10485760/10485760 bytes at offset 3298534883328
+10 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+
+# Write test pattern 0x91
+qemu-io -c write -P 0x91 100M 10M --object secret,id=sec0,data=MTIzNDU2,format=base64 --image-opts driver=luks,key-secret=sec0,file.filename=TEST_DIR/luks-aes-256-cbc-plain64-sha256-sha1.img
+wrote 10485760/10485760 bytes at offset 104857600
+10 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+
+# Write test pattern 0x5e
+qemu-io -c write -P 0x5e 3145728M 10M --object secret,id=sec0,data=MTIzNDU2,format=base64 --image-opts driver=luks,key-secret=sec0,file.filename=TEST_DIR/luks-aes-256-cbc-plain64-sha256-sha1.img
+wrote 10485760/10485760 bytes at offset 3298534883328
+10 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+
+# Open dev
+sudo cryptsetup -q -v luksOpen TEST_DIR/luks-aes-256-cbc-plain64-sha256-sha1.img qiotest-145-aes-256-cbc-plain64-sha256-sha1
+# Set dev owner
+sudo chown UID:GID /dev/mapper/qiotest-145-aes-256-cbc-plain64-sha256-sha1
+# Read test pattern 0x91
+qemu-io -c read -P 0x91 100M 10M --image-opts driver=file,filename=/dev/mapper/qiotest-145-aes-256-cbc-plain64-sha256-sha1
+read 10485760/10485760 bytes at offset 104857600
+10 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+
+# Read test pattern 0x5e
+qemu-io -c read -P 0x5e 3145728M 10M --image-opts driver=file,filename=/dev/mapper/qiotest-145-aes-256-cbc-plain64-sha256-sha1
+read 10485760/10485760 bytes at offset 3298534883328
+10 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+
+# Close dev
+sudo cryptsetup -q -v luksClose qiotest-145-aes-256-cbc-plain64-sha256-sha1
+# Delete image
+unlink TEST_DIR/luks-aes-256-cbc-plain64-sha256-sha1.img
+
