diff --git a/tests/qemu-iotests/004 b/tests/qemu-iotests/004
index 67e1beb209..6f2aa3d9a2 100755
--- a/tests/qemu-iotests/004
+++ b/tests/qemu-iotests/004
@@ -37,7 +37,7 @@ trap "_cleanup; exit \$status" 0 1 2 3 15
 . ./common.rc
 . ./common.filter
 
-_supported_fmt raw qcow qcow2 qed vdi vmdk vhdx
+_supported_fmt raw qcow qcow2 qed vdi vmdk vhdx luks
 _supported_proto generic
 _supported_os Linux
 
diff --git a/tests/qemu-iotests/012 b/tests/qemu-iotests/012
index d1d3f22093..01a770d59c 100755
--- a/tests/qemu-iotests/012
+++ b/tests/qemu-iotests/012
@@ -43,13 +43,16 @@ _supported_fmt generic
 _supported_proto file
 _supported_os Linux
 
+# Remove once all tests are fixed to use TEST_IMG_FILE
+# correctly and common.rc sets it unconditionally
+test -z "$TEST_IMG_FILE" && TEST_IMG_FILE=$TEST_IMG
 
 size=128M
 _make_test_img $size
 
 echo
 echo "== mark image read-only"
-chmod a-w "$TEST_IMG"
+chmod a-w "$TEST_IMG_FILE"
 
 echo
 echo "== read from read-only image"
diff --git a/tests/qemu-iotests/048 b/tests/qemu-iotests/048
index e1eeac2a31..203c04fc7f 100755
--- a/tests/qemu-iotests/048
+++ b/tests/qemu-iotests/048
@@ -31,13 +31,13 @@ _cleanup()
 {
     echo "Cleanup"
     _cleanup_test_img
-    rm "${TEST_IMG2}"
+    rm "${TEST_IMG_FILE2}"
 }
 trap "_cleanup; exit \$status" 0 1 2 3 15
 
 _compare()
 {
-    $QEMU_IMG compare "$@" "$TEST_IMG" "${TEST_IMG2}"
+    $QEMU_IMG compare $QEMU_IMG_EXTRA_ARGS "$@" "$TEST_IMG" "${TEST_IMG2}"
     echo $?
 }
 
@@ -46,25 +46,37 @@ _compare()
 . ./common.filter
 . ./common.pattern
 
-_supported_fmt raw qcow qcow2 qed
+_supported_fmt raw qcow qcow2 qed luks
 _supported_proto file
 _supported_os Linux
 
+# Remove once all tests are fixed to use TEST_IMG_FILE
+# correctly and common.rc sets it unconditionally
+test -z "$TEST_IMG_FILE" && TEST_IMG_FILE=$TEST_IMG
+
 # Setup test basic parameters
 TEST_IMG2=$TEST_IMG.2
+TEST_IMG_FILE2=$TEST_IMG_FILE.2
 CLUSTER_SIZE=4096
-size=1024M
+size=128M
 
 _make_test_img $size
 io_pattern write 524288 $CLUSTER_SIZE $CLUSTER_SIZE 4 45
 
 # Compare identical images
-cp "$TEST_IMG" "${TEST_IMG2}"
+cp "$TEST_IMG_FILE" "${TEST_IMG_FILE2}"
 _compare
 _compare -q
 
 # Compare images with different size
-$QEMU_IMG resize -f $IMGFMT "$TEST_IMG" +512M
+if [ "$IMGOPTSSYNTAX" = "true" ]; then
+    $QEMU_IMG resize $QEMU_IMG_EXTRA_ARGS "$TEST_IMG" +32M
+else
+    $QEMU_IMG resize -f $IMGFMT "$TEST_IMG" +32M
+fi
+# Ensure extended space is zero-initialized
+$QEMU_IO "$TEST_IMG" -c "write -z $size 32M" | _filter_qemu_io
+
 _compare
 _compare -s
 
@@ -77,7 +89,7 @@ _compare
 # Test unaligned case of mismatch offsets in allocated clusters
 _make_test_img $size
 io_pattern write 0 512 0 1 100
-cp "$TEST_IMG" "$TEST_IMG2"
+cp "$TEST_IMG_FILE" "$TEST_IMG_FILE2"
 io_pattern write 512 512 0 1 101
 _compare
 
diff --git a/tests/qemu-iotests/048.out b/tests/qemu-iotests/048.out
index 57100dc453..0bcf6635a1 100644
--- a/tests/qemu-iotests/048.out
+++ b/tests/qemu-iotests/048.out
@@ -1,5 +1,5 @@
 QA output created by 048
-Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=134217728
 === IO: pattern 45
 wrote 4096/4096 bytes at offset 524288
 4 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
@@ -13,6 +13,8 @@ Images are identical.
 0
 0
 Image resized.
+wrote 33554432/33554432 bytes at offset 134217728
+32 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
 Warning: Image size mismatch!
 Images are identical.
 0
@@ -28,7 +30,7 @@ wrote 4096/4096 bytes at offset 0
 4 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
 Content mismatch at offset 0!
 1
-Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=1073741824
+Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=134217728
 === IO: pattern 100
 wrote 512/512 bytes at offset 0
 512 bytes, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
diff --git a/tests/qemu-iotests/052 b/tests/qemu-iotests/052
index 4b647242d2..842eaced3b 100755
--- a/tests/qemu-iotests/052
+++ b/tests/qemu-iotests/052
@@ -47,6 +47,10 @@ _supported_cache_modes "writeback" "writethrough" "unsafe"
 size=128M
 _make_test_img $size
 
+echo
+echo "== initializing whole image =="
+$QEMU_IO -c "write -z 0 $size" "$TEST_IMG" | _filter_qemu_io
+
 echo
 echo "== reading whole image =="
 $QEMU_IO -s -c "read 0 $size" "$TEST_IMG" | _filter_qemu_io
diff --git a/tests/qemu-iotests/052.out b/tests/qemu-iotests/052.out
index 9dab51c0e8..a377d3028d 100644
--- a/tests/qemu-iotests/052.out
+++ b/tests/qemu-iotests/052.out
@@ -1,6 +1,10 @@
 QA output created by 052
 Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=134217728
 
+== initializing whole image ==
+wrote 134217728/134217728 bytes at offset 0
+128 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
+
 == reading whole image ==
 read 134217728/134217728 bytes at offset 0
 128 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
diff --git a/tests/qemu-iotests/100 b/tests/qemu-iotests/100
index 5b2fb33330..e66db07982 100755
--- a/tests/qemu-iotests/100
+++ b/tests/qemu-iotests/100
@@ -47,6 +47,7 @@ size=128M
 echo
 echo "== Single request =="
 _make_test_img $size
+$QEMU_IO -c "write -z 0 8k" "$TEST_IMG" | _filter_qemu_io
 $QEMU_IO -c "multiwrite 0 4k" "$TEST_IMG" | _filter_qemu_io
 
 echo
@@ -59,6 +60,7 @@ _cleanup_test_img
 echo
 echo "== Sequential requests =="
 _make_test_img $size
+$QEMU_IO -c "write -z 0 12k" "$TEST_IMG" | _filter_qemu_io
 $QEMU_IO -c "multiwrite 0 4k ; 4k 4k" "$TEST_IMG" | _filter_qemu_io
 
 echo
@@ -72,6 +74,7 @@ _cleanup_test_img
 echo
 echo "== Superset overlapping requests =="
 _make_test_img $size
+$QEMU_IO -c "write -z 0 8k" "$TEST_IMG" | _filter_qemu_io
 $QEMU_IO -c "multiwrite 0 4k ; 1k 2k" "$TEST_IMG" | _filter_qemu_io
 
 echo
@@ -87,6 +90,7 @@ _cleanup_test_img
 echo
 echo "== Subset overlapping requests =="
 _make_test_img $size
+$QEMU_IO -c "write -z 0 8k" "$TEST_IMG" | _filter_qemu_io
 $QEMU_IO -c "multiwrite 1k 2k ; 0k 4k" "$TEST_IMG" | _filter_qemu_io
 
 echo
@@ -102,6 +106,7 @@ _cleanup_test_img
 echo
 echo "== Head overlapping requests =="
 _make_test_img $size
+$QEMU_IO -c "write -z 0 8k" "$TEST_IMG" | _filter_qemu_io
 $QEMU_IO -c "multiwrite 0k 2k ; 0k 4k" "$TEST_IMG" | _filter_qemu_io
 
 echo
@@ -116,6 +121,7 @@ _cleanup_test_img
 echo
 echo "== Tail overlapping requests =="
 _make_test_img $size
+$QEMU_IO -c "write -z 0 8k" "$TEST_IMG" | _filter_qemu_io
 $QEMU_IO -c "multiwrite 2k 2k ; 0k 4k" "$TEST_IMG" | _filter_qemu_io
 
 echo
@@ -130,6 +136,7 @@ _cleanup_test_img
 echo
 echo "== Disjoint requests =="
 _make_test_img $size
+$QEMU_IO -c "write -z 0 72k" "$TEST_IMG" | _filter_qemu_io
 $QEMU_IO -c "multiwrite 0 4k ; 64k 4k" "$TEST_IMG" | _filter_qemu_io
 
 echo
diff --git a/tests/qemu-iotests/100.out b/tests/qemu-iotests/100.out
index 05649038d9..a44cae40db 100644
--- a/tests/qemu-iotests/100.out
+++ b/tests/qemu-iotests/100.out
@@ -2,6 +2,8 @@ QA output created by 100
 
 == Single request ==
 Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=134217728
+wrote 8192/8192 bytes at offset 0
+8 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
 wrote 4096/4096 bytes at offset 0
 4 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
 
@@ -13,6 +15,8 @@ read 4096/4096 bytes at offset 4096
 
 == Sequential requests ==
 Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=134217728
+wrote 12288/12288 bytes at offset 0
+12 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
 wrote 8192/8192 bytes at offset 0
 8 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
 
@@ -26,6 +30,8 @@ read 4096/4096 bytes at offset 8192
 
 == Superset overlapping requests ==
 Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=134217728
+wrote 8192/8192 bytes at offset 0
+8 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
 wrote 6144/6144 bytes at offset 0
 6 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
 
@@ -39,6 +45,8 @@ read 4096/4096 bytes at offset 4096
 
 == Subset overlapping requests ==
 Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=134217728
+wrote 8192/8192 bytes at offset 0
+8 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
 wrote 6144/6144 bytes at offset 1024
 6 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
 
@@ -52,6 +60,8 @@ read 4096/4096 bytes at offset 4096
 
 == Head overlapping requests ==
 Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=134217728
+wrote 8192/8192 bytes at offset 0
+8 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
 wrote 6144/6144 bytes at offset 0
 6 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
 
@@ -63,6 +73,8 @@ read 4096/4096 bytes at offset 4096
 
 == Tail overlapping requests ==
 Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=134217728
+wrote 8192/8192 bytes at offset 0
+8 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
 wrote 6144/6144 bytes at offset 2048
 6 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
 
@@ -74,6 +86,8 @@ read 4096/4096 bytes at offset 4096
 
 == Disjoint requests ==
 Formatting 'TEST_DIR/t.IMGFMT', fmt=IMGFMT size=134217728
+wrote 73728/73728 bytes at offset 0
+72 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
 wrote 8192/8192 bytes at offset 0
 8 KiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
 
diff --git a/tests/qemu-iotests/common b/tests/qemu-iotests/common
index e87287ca79..d60ea2ce3c 100644
--- a/tests/qemu-iotests/common
+++ b/tests/qemu-iotests/common
@@ -209,6 +209,13 @@ testlist options
             xpand=false
             ;;
 
+        -luks)
+            IMGOPTSSYNTAX=true
+            IMGFMT=luks
+            IMGKEYSECRET=123456
+            xpand=false
+            ;;
+
         -qed)
             IMGFMT=qed
             xpand=false
diff --git a/tests/qemu-iotests/common.rc b/tests/qemu-iotests/common.rc
index 164792d259..306b00c210 100644
--- a/tests/qemu-iotests/common.rc
+++ b/tests/qemu-iotests/common.rc
@@ -55,6 +55,9 @@ umask 022
 
 if [ "$IMGOPTSSYNTAX" = "true" ]; then
     DRIVER="driver=$IMGFMT"
+    if [ "$IMGFMT" = "luks" ]; then
+        DRIVER="$DRIVER,key-secret=keysec0"
+    fi
     if [ "$IMGPROTO" = "file" ]; then
         TEST_IMG_FILE=$TEST_DIR/t.$IMGFMT
         TEST_IMG="$DRIVER,file.filename=$TEST_DIR/t.$IMGFMT"