Index: pve-qemu-kvm-5.1.0/qapi/block-core.json
===================================================================
--- pve-qemu-kvm-5.1.0.orig/qapi/block-core.json
+++ pve-qemu-kvm-5.1.0/qapi/block-core.json
@@ -3041,7 +3041,7 @@
             'luks', 'nbd', 'nfs', 'null-aio', 'null-co', 'nvme', 'parallels',
             'qcow', 'qcow2', 'qed', 'quorum', 'raw', 'rbd',
             { 'name': 'replication', 'if': 'defined(CONFIG_REPLICATION)' },
-            'sheepdog', 'pbs',
+            'sheepdog', 'pbs', 'vitastor',
             'ssh', 'throttle', 'vdi', 'vhdx', 'vmdk', 'vpc', 'vvfat' ] }
 
 ##
@@ -3889,6 +3889,28 @@
             '*tag': 'str' } }
 
 ##
+# @BlockdevOptionsVitastor:
+#
+# Driver specific block device options for vitastor
+#
+# @image:       Image name
+# @inode:       Inode number
+# @pool:        Pool ID
+# @size:        Desired image size in bytes
+# @config-path: Path to Vitastor configuration
+# @etcd-host:   etcd connection address(es)
+# @etcd-prefix: etcd key/value prefix
+##
+{ 'struct': 'BlockdevOptionsVitastor',
+  'data': { '*inode': 'uint64',
+            '*pool': 'uint64',
+            '*size': 'uint64',
+            '*image': 'str',
+            '*config-path': 'str',
+            '*etcd-host': 'str',
+            '*etcd-prefix': 'str' } }
+
+##
 # @ReplicationMode:
 #
 # An enumeration of replication modes.
@@ -4234,6 +4256,7 @@
       'replication': { 'type': 'BlockdevOptionsReplication',
                        'if': 'defined(CONFIG_REPLICATION)' },
       'sheepdog':   'BlockdevOptionsSheepdog',
+      'vitastor':   'BlockdevOptionsVitastor',
       'ssh':        'BlockdevOptionsSsh',
       'throttle':   'BlockdevOptionsThrottle',
       'vdi':        'BlockdevOptionsGenericFormat',
@@ -4623,6 +4646,17 @@
             '*cluster-size' :   'size' } }
 
 ##
+# @BlockdevCreateOptionsVitastor:
+#
+# Driver specific image creation options for Vitastor.
+#
+# @size: Size of the virtual disk in bytes
+##
+{ 'struct': 'BlockdevCreateOptionsVitastor',
+  'data': { 'location':         'BlockdevOptionsVitastor',
+            'size':             'size' } }
+
+##
 # @BlockdevVmdkSubformat:
 #
 # Subformat options for VMDK images
@@ -4884,6 +4918,7 @@
       'qed':            'BlockdevCreateOptionsQed',
       'rbd':            'BlockdevCreateOptionsRbd',
       'sheepdog':       'BlockdevCreateOptionsSheepdog',
+      'vitastor':       'BlockdevCreateOptionsVitastor',
       'ssh':            'BlockdevCreateOptionsSsh',
       'vdi':            'BlockdevCreateOptionsVdi',
       'vhdx':           'BlockdevCreateOptionsVhdx',
Index: pve-qemu-kvm-5.1.0/configure
===================================================================
--- pve-qemu-kvm-5.1.0.orig/configure
+++ pve-qemu-kvm-5.1.0/configure
@@ -446,6 +446,7 @@ trace_backends="log"
 trace_file="trace"
 spice=""
 rbd=""
+vitastor=""
 smartcard=""
 libusb=""
 usb_redir=""
@@ -1383,6 +1384,10 @@ for opt do
   ;;
   --enable-rbd) rbd="yes"
   ;;
+  --disable-vitastor) vitastor="no"
+  ;;
+  --enable-vitastor) vitastor="yes"
+  ;;
   --disable-xfsctl) xfs="no"
   ;;
   --enable-xfsctl) xfs="yes"
@@ -1901,6 +1906,7 @@ disabled with --disable-FEATURE, default
   vhost-vdpa      vhost-vdpa kernel backend support
   spice           spice
   rbd             rados block device (rbd)
+  vitastor        vitastor block device
   libiscsi        iscsi support
   libnfs          nfs support
   smartcard       smartcard support (libcacard)
@@ -4234,6 +4240,27 @@ EOF
 fi
 
 ##########################################
+# vitastor probe
+if test "$vitastor" != "no" ; then
+  cat > $TMPC <<EOF
+#include <vitastor_c.h>
+int main(void) {
+  vitastor_c_create_qemu(0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0);
+  return 0;
+}
+EOF
+  vitastor_libs="-lvitastor_client"
+  if compile_prog "" "$vitastor_libs" ; then
+    vitastor=yes
+  else
+    if test "$vitastor" = "yes" ; then
+      feature_not_found "vitastor block device" "Install vitastor-client-dev"
+    fi
+    vitastor=no
+  fi
+fi
+
+##########################################
 # libssh probe
 if test "$libssh" != "no" ; then
   if $pkg_config --exists libssh; then
@@ -6969,6 +6996,7 @@ echo "Trace output file $trace_file-<pid
 fi
 echo "spice support     $spice $(echo_version $spice $spice_protocol_version/$spice_server_version)"
 echo "rbd support       $rbd"
+echo "vitastor support  $vitastor"
 echo "xfsctl support    $xfs"
 echo "smartcard support $smartcard"
 echo "libusb            $libusb"
@@ -7644,6 +7672,10 @@ if test "$rbd" = "yes" ; then
   echo "RBD_CFLAGS=$rbd_cflags" >> $config_host_mak
   echo "RBD_LIBS=$rbd_libs" >> $config_host_mak
 fi
+if test "$vitastor" = "yes" ; then
+  echo "CONFIG_VITASTOR=y" >> $config_host_mak
+  echo "VITASTOR_LIBS=$vitastor_libs" >> $config_host_mak
+fi
 
 echo "CONFIG_COROUTINE_BACKEND=$coroutine" >> $config_host_mak
 if test "$coroutine_pool" = "yes" ; then
Index: pve-qemu-kvm-5.1.0/block/Makefile.objs
===================================================================
--- pve-qemu-kvm-5.1.0.orig/block/Makefile.objs
+++ pve-qemu-kvm-5.1.0/block/Makefile.objs
@@ -32,6 +32,7 @@ block-obj-$(if $(CONFIG_LIBISCSI),y,n) +
 block-obj-$(CONFIG_LIBNFS) += nfs.o
 block-obj-$(CONFIG_CURL) += curl.o
 block-obj-$(CONFIG_RBD) += rbd.o
+block-obj-$(CONFIG_VITASTOR) += vitastor.o
 block-obj-$(CONFIG_GLUSTERFS) += gluster.o
 block-obj-$(CONFIG_LIBSSH) += ssh.o
 block-obj-y += backup-dump.o
@@ -61,6 +62,8 @@ curl.o-cflags      := $(CURL_CFLAGS)
 curl.o-libs        := $(CURL_LIBS)
 rbd.o-cflags       := $(RBD_CFLAGS)
 rbd.o-libs         := $(RBD_LIBS)
+vitastor.o-cflags  := $(VITASTOR_CFLAGS)
+vitastor.o-libs    := $(VITASTOR_LIBS)
 gluster.o-cflags   := $(GLUSTERFS_CFLAGS)
 gluster.o-libs     := $(GLUSTERFS_LIBS)
 ssh.o-cflags       := $(LIBSSH_CFLAGS)