diff --git a/target/s390x/cpu_features.c b/target/s390x/cpu_features.c
index e0a4769c19..5f37e655fe 100644
--- a/target/s390x/cpu_features.c
+++ b/target/s390x/cpu_features.c
@@ -110,6 +110,7 @@ static const S390FeatDef s390_features[] = {
     FEAT_INIT("cmmnt", S390_FEAT_TYPE_STFL, 147, "CMM: ESSA-enhancement (no translate) facility"),
     FEAT_INIT("vxeh2", S390_FEAT_TYPE_STFL, 148, "Vector Enhancements facility 2"),
     FEAT_INIT("esort-base", S390_FEAT_TYPE_STFL, 150, "Enhanced-sort facility (excluding subfunctions)"),
+    FEAT_INIT("deflate-base", S390_FEAT_TYPE_STFL, 151, "Deflate-conversion facility (excluding subfunctions)"),
     FEAT_INIT("vxbeh", S390_FEAT_TYPE_STFL, 152, "Vector BCD enhancements facility 1"),
     FEAT_INIT("msa9-base", S390_FEAT_TYPE_STFL, 155, "Message-security-assist-extension-9 facility (excluding subfunctions)"),
     FEAT_INIT("etoken", S390_FEAT_TYPE_STFL, 156, "Etoken facility"),
@@ -347,6 +348,11 @@ static const S390FeatDef s390_features[] = {
     FEAT_INIT("sortl-32", S390_FEAT_TYPE_SORTL, 130, "SORTL 32 input lists"),
     FEAT_INIT("sortl-128", S390_FEAT_TYPE_SORTL, 132, "SORTL 128 input lists"),
     FEAT_INIT("sortl-f0", S390_FEAT_TYPE_SORTL, 192, "SORTL format 0 parameter-block"),
+
+    FEAT_INIT("dfltcc-gdht", S390_FEAT_TYPE_DFLTCC, 1, "DFLTCC GDHT"),
+    FEAT_INIT("dfltcc-cmpr", S390_FEAT_TYPE_DFLTCC, 2, "DFLTCC CMPR"),
+    FEAT_INIT("dfltcc-xpnd", S390_FEAT_TYPE_DFLTCC, 4, "DFLTCC XPND"),
+    FEAT_INIT("dfltcc-f0", S390_FEAT_TYPE_DFLTCC, 192, "DFLTCC format 0 parameter-block"),
 };
 
 const S390FeatDef *s390_feat_def(S390Feat feat)
@@ -411,6 +417,7 @@ void s390_fill_feat_block(const S390FeatBitmap features, S390FeatType type,
     case S390_FEAT_TYPE_KMA:
     case S390_FEAT_TYPE_KDSA:
     case S390_FEAT_TYPE_SORTL:
+    case S390_FEAT_TYPE_DFLTCC:
         set_be_bit(0, data); /* query is always available */
         break;
     default:
@@ -439,6 +446,7 @@ void s390_add_from_feat_block(S390FeatBitmap features, S390FeatType type,
        break;
     case S390_FEAT_TYPE_PLO:
     case S390_FEAT_TYPE_SORTL:
+    case S390_FEAT_TYPE_DFLTCC:
        nr_bits = 256;
        break;
     default:
@@ -511,6 +519,7 @@ static S390FeatGroupDef s390_feature_groups[] = {
     FEAT_GROUP_INIT("msa9_pckmo", MSA_EXT_9_PCKMO, "Message-security-assist-extension 9 PCKMO subfunctions"),
     FEAT_GROUP_INIT("mepochptff", MULTIPLE_EPOCH_PTFF, "PTFF enhancements introduced with Multiple-epoch facility"),
     FEAT_GROUP_INIT("esort", ENH_SORT, "Enhanced-sort facility"),
+    FEAT_GROUP_INIT("deflate", DEFLATE_CONVERSION, "Deflate-conversion facility"),
 };
 
 const S390FeatGroupDef *s390_feat_group_def(S390FeatGroup group)
diff --git a/target/s390x/cpu_features.h b/target/s390x/cpu_features.h
index 3b8c5b25dd..da695a8346 100644
--- a/target/s390x/cpu_features.h
+++ b/target/s390x/cpu_features.h
@@ -41,6 +41,7 @@ typedef enum {
     S390_FEAT_TYPE_KMA,
     S390_FEAT_TYPE_KDSA,
     S390_FEAT_TYPE_SORTL,
+    S390_FEAT_TYPE_DFLTCC,
 } S390FeatType;
 
 /* Definition of a CPU feature */
diff --git a/target/s390x/cpu_features_def.h b/target/s390x/cpu_features_def.h
index bb8585847f..292b17b35d 100644
--- a/target/s390x/cpu_features_def.h
+++ b/target/s390x/cpu_features_def.h
@@ -98,6 +98,7 @@ typedef enum {
     S390_FEAT_CMM_NT,
     S390_FEAT_VECTOR_ENH2,
     S390_FEAT_ESORT_BASE,
+    S390_FEAT_DEFLATE_BASE,
     S390_FEAT_VECTOR_BCD_ENH,
     S390_FEAT_MSA_EXT_9,
     S390_FEAT_ETOKEN,
@@ -354,6 +355,12 @@ typedef enum {
     S390_FEAT_SORTL_128,
     S390_FEAT_SORTL_F0,
 
+    /* DEFLATE */
+    S390_FEAT_DEFLATE_GHDT,
+    S390_FEAT_DEFLATE_CMPR,
+    S390_FEAT_DEFLATE_XPND,
+    S390_FEAT_DEFLATE_F0,
+
     S390_FEAT_MAX,
 } S390Feat;
 
diff --git a/target/s390x/gen-features.c b/target/s390x/gen-features.c
index 3db323fc0c..170226d3dd 100644
--- a/target/s390x/gen-features.c
+++ b/target/s390x/gen-features.c
@@ -254,6 +254,13 @@
     S390_FEAT_SORTL_F0
 
 
+#define S390_FEAT_GROUP_DEFLATE_CONVERSION \
+    S390_FEAT_DEFLATE_BASE, \
+    S390_FEAT_DEFLATE_GHDT, \
+    S390_FEAT_DEFLATE_CMPR, \
+    S390_FEAT_DEFLATE_XPND, \
+    S390_FEAT_DEFLATE_F0
+
 /* cpu feature groups */
 static uint16_t group_PLO[] = {
     S390_FEAT_GROUP_PLO,
@@ -307,6 +314,10 @@ static uint16_t group_ENH_SORT[] = {
     S390_FEAT_GROUP_ENH_SORT,
 };
 
+static uint16_t group_DEFLATE_CONVERSION[] = {
+    S390_FEAT_GROUP_DEFLATE_CONVERSION,
+};
+
 /* Base features (in order of release)
  * Only non-hypervisor managed features belong here.
  * Base feature sets are static meaning they do not change in future QEMU
@@ -765,6 +776,7 @@ static FeatGroupDefSpec FeatGroupDef[] = {
     FEAT_GROUP_INITIALIZER(MSA_EXT_9_PCKMO),
     FEAT_GROUP_INITIALIZER(MULTIPLE_EPOCH_PTFF),
     FEAT_GROUP_INITIALIZER(ENH_SORT),
+    FEAT_GROUP_INITIALIZER(DEFLATE_CONVERSION),
 };
 
 #define QEMU_FEAT_INITIALIZER(_name)                   \
diff --git a/target/s390x/kvm.c b/target/s390x/kvm.c
index 7681492c41..db9108b63c 100644
--- a/target/s390x/kvm.c
+++ b/target/s390x/kvm.c
@@ -2086,6 +2086,9 @@ static int query_cpu_subfunc(S390FeatBitmap features)
     if (test_bit(S390_FEAT_ESORT_BASE, features)) {
         s390_add_from_feat_block(features, S390_FEAT_TYPE_SORTL, prop.sortl);
     }
+    if (test_bit(S390_FEAT_DEFLATE_BASE, features)) {
+        s390_add_from_feat_block(features, S390_FEAT_TYPE_DFLTCC, prop.dfltcc);
+    }
     return 0;
 }
 
@@ -2136,6 +2139,9 @@ static int configure_cpu_subfunc(const S390FeatBitmap features)
     if (test_bit(S390_FEAT_ESORT_BASE, features)) {
         s390_fill_feat_block(features, S390_FEAT_TYPE_SORTL, prop.sortl);
     }
+    if (test_bit(S390_FEAT_DEFLATE_BASE, features)) {
+        s390_fill_feat_block(features, S390_FEAT_TYPE_DFLTCC, prop.dfltcc);
+    }
     return kvm_vm_ioctl(kvm_state, KVM_SET_DEVICE_ATTR, &attr);
 }
 
