qemu: allow use of async teardown in domain

Asynchronous teardown can be specified if the QEMU binary supports it by
adding in the domain XML

  <features>
    ...
    <async-teardown enabled='yes|no'/>
    ...
  </features>

By default this new feature is disabled.

Signed-off-by: Boris Fiuczynski <fiuczy@linux.ibm.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Michal Privoznik <mprivozn@redhat.com>

docs/formatdomain.rst

@@ -2000,6 +2000,7 @@ Hypervisors may allow certain CPU / machine features to be toggled on/off.
      <tcg>
        <tb-cache unit='MiB'>128</tb-cache>
      </tcg>
+     <async-teardown enabled='yes'/>
    </features>
    ...
 
@@ -2230,6 +2231,11 @@ are:
    tb-cache    The size of translation block cache size       an integer (a multiple of MiB)                      :since:`8.0.0`
    =========== ============================================== =================================================== ==============
 
+``async-teardown``
+   Depending on the ``enabled`` attribute (values ``yes``, ``no``) enable or
+   disable QEMU asynchronous teardown to improve memory reclaiming on a guest.
+   :since:`Since 9.6.0` (QEMU only)
+
 Time keeping
 ------------
 

src/conf/domain_conf.c

@@ -181,6 +181,7 @@ VIR_ENUM_IMPL(virDomainFeature,
               "sbbc",
               "ibs",
               "tcg",
+              "async-teardown",
 );
 
 VIR_ENUM_IMPL(virDomainCapabilitiesPolicy,
@@ -16689,6 +16690,20 @@ virDomainFeaturesDefParse(virDomainDef *def,
                 return -1;
             break;
 
+        case VIR_DOMAIN_FEATURE_ASYNC_TEARDOWN: {
+            virTristateBool enabled;
+
+            if (virXMLPropTristateBool(nodes[i], "enabled",
+                                       VIR_XML_PROP_NONE, &enabled) < 0)
+                return -1;
+
+            if (enabled == VIR_TRISTATE_BOOL_ABSENT)
+                enabled = VIR_TRISTATE_BOOL_YES;
+
+            def->features[val] = enabled;
+            break;
+        }
+
         case VIR_DOMAIN_FEATURE_LAST:
             break;
         }
@@ -20628,6 +20643,7 @@ virDomainDefFeaturesCheckABIStability(virDomainDef *src,
 
         case VIR_DOMAIN_FEATURE_MSRS:
         case VIR_DOMAIN_FEATURE_TCG:
+        case VIR_DOMAIN_FEATURE_ASYNC_TEARDOWN:
         case VIR_DOMAIN_FEATURE_LAST:
             break;
         }
@@ -27340,6 +27356,12 @@ virDomainDefFormatFeatures(virBuffer *buf,
             virDomainFeatureTCGFormat(&childBuf, def);
             break;
 
+        case VIR_DOMAIN_FEATURE_ASYNC_TEARDOWN:
+            if (def->features[i] != VIR_TRISTATE_SWITCH_ABSENT)
+                virBufferAsprintf(&childBuf, "<async-teardown enabled='%s'/>\n",
+                                  virTristateBoolTypeToString(def->features[i]));
+            break;
+
         case VIR_DOMAIN_FEATURE_LAST:
             break;
         }

src/conf/domain_conf.h

@@ -2170,6 +2170,7 @@ typedef enum {
     VIR_DOMAIN_FEATURE_SBBC,
     VIR_DOMAIN_FEATURE_IBS,
     VIR_DOMAIN_FEATURE_TCG,
+    VIR_DOMAIN_FEATURE_ASYNC_TEARDOWN,
 
     VIR_DOMAIN_FEATURE_LAST
 } virDomainFeature;

src/conf/schemas/domaincommon.rng

@@ -6660,6 +6660,15 @@
           <optional>
             <ref name="tcgfeatures"/>
           </optional>
+          <optional>
+            <element name="async-teardown">
+              <optional>
+                <attribute name="enabled">
+                  <ref name="virYesNo"/>
+                </attribute>
+              </optional>
+            </element>
+          </optional>
         </interleave>
       </element>
     </optional>

src/qemu/qemu_command.c

@@ -10177,6 +10177,25 @@ qemuBuildCryptoCommandLine(virCommand *cmd,
 }
 
 
+static int
+qemuBuildAsyncTeardownCommandLine(virCommand *cmd,
+                                  const virDomainDef *def,
+                                  virQEMUCaps *qemuCaps)
+{
+    g_autofree char *async = NULL;
+    virTristateBool enabled = def->features[VIR_DOMAIN_FEATURE_ASYNC_TEARDOWN];
+
+    if (enabled != VIR_TRISTATE_BOOL_ABSENT &&
+        virQEMUCapsGet(qemuCaps, QEMU_CAPS_RUN_WITH_ASYNC_TEARDOWN)) {
+        async = g_strdup_printf("async-teardown=%s",
+                                virTristateSwitchTypeToString(enabled));
+        virCommandAddArgList(cmd, "-run-with", async, NULL);
+    }
+
+    return 0;
+}
+
+
 typedef enum {
     QEMU_COMMAND_DEPRECATION_BEHAVIOR_NONE = 0,
     QEMU_COMMAND_DEPRECATION_BEHAVIOR_OMIT,
@@ -10532,6 +10551,9 @@ qemuBuildCommandLine(virDomainObj *vm,
     if (qemuBuildCryptoCommandLine(cmd, def, qemuCaps) < 0)
         return NULL;
 
+    if (qemuBuildAsyncTeardownCommandLine(cmd, def, qemuCaps) < 0)
+        return NULL;
+
     if (cfg->logTimestamp)
         virCommandAddArgList(cmd, "-msg", "timestamp=on", NULL);
 

src/qemu/qemu_validate.c

@@ -219,6 +219,15 @@ qemuValidateDomainDefFeatures(const virDomainDef *def,
             }
             break;
 
+        case VIR_DOMAIN_FEATURE_ASYNC_TEARDOWN:
+            if (def->features[i] == VIR_TRISTATE_BOOL_YES &&
+                !virQEMUCapsGet(qemuCaps, QEMU_CAPS_RUN_WITH_ASYNC_TEARDOWN)) {
+                virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
+                              _("asynchronous teardown is not available with this QEMU binary"));
+                return -1;
+            }
+            break;
+
         case VIR_DOMAIN_FEATURE_SMM:
         case VIR_DOMAIN_FEATURE_KVM:
         case VIR_DOMAIN_FEATURE_XEN:

tests/qemuxml2argvdata/async-teardown.x86_64-latest.args

@@ -0,0 +1,37 @@
+LC_ALL=C \
+PATH=/bin \
+HOME=/var/lib/libvirt/qemu/domain--1-QEMUGuest1 \
+USER=test \
+LOGNAME=test \
+XDG_DATA_HOME=/var/lib/libvirt/qemu/domain--1-QEMUGuest1/.local/share \
+XDG_CACHE_HOME=/var/lib/libvirt/qemu/domain--1-QEMUGuest1/.cache \
+XDG_CONFIG_HOME=/var/lib/libvirt/qemu/domain--1-QEMUGuest1/.config \
+/usr/bin/qemu-system-x86_64 \
+-name guest=QEMUGuest1,debug-threads=on \
+-S \
+-object '{"qom-type":"secret","id":"masterKey0","format":"raw","file":"/var/lib/libvirt/qemu/domain--1-QEMUGuest1/master-key.aes"}' \
+-machine pc,usb=off,dump-guest-core=off,memory-backend=pc.ram,acpi=off \
+-accel tcg \
+-cpu qemu64 \
+-m size=219136k \
+-object '{"qom-type":"memory-backend-ram","id":"pc.ram","size":224395264}' \
+-overcommit mem-lock=off \
+-smp 1,sockets=1,cores=1,threads=1 \
+-uuid c7a5fdbd-edaf-9455-926a-d65c16db1809 \
+-display none \
+-no-user-config \
+-nodefaults \
+-chardev socket,id=charmonitor,fd=1729,server=on,wait=off \
+-mon chardev=charmonitor,id=monitor,mode=control \
+-rtc base=utc \
+-no-shutdown \
+-boot strict=on \
+-device '{"driver":"piix3-usb-uhci","id":"usb","bus":"pci.0","addr":"0x1.0x2"}' \
+-blockdev '{"driver":"host_device","filename":"/dev/HostVG/QEMUGuest1","node-name":"libvirt-1-storage","auto-read-only":true,"discard":"unmap"}' \
+-blockdev '{"node-name":"libvirt-1-format","read-only":false,"driver":"raw","file":"libvirt-1-storage"}' \
+-device '{"driver":"ide-hd","bus":"ide.0","unit":0,"drive":"libvirt-1-format","id":"ide0-0-0","bootindex":1}' \
+-audiodev '{"id":"audio1","driver":"none"}' \
+-device '{"driver":"virtio-balloon-pci","id":"balloon0","bus":"pci.0","addr":"0x2"}' \
+-sandbox on,obsolete=deny,elevateprivileges=deny,spawn=deny,resourcecontrol=deny \
+-run-with async-teardown=on \
+-msg timestamp=on

tests/qemuxml2argvdata/async-teardown.xml

@@ -0,0 +1,31 @@
+<domain type='qemu'>
+  <name>QEMUGuest1</name>
+  <uuid>c7a5fdbd-edaf-9455-926a-d65c16db1809</uuid>
+  <memory unit='KiB'>219136</memory>
+  <currentMemory unit='KiB'>219136</currentMemory>
+  <vcpu placement='static'>1</vcpu>
+  <os>
+    <type arch='x86_64' machine='pc'>hvm</type>
+    <boot dev='hd'/>
+  </os>
+  <clock offset='utc'/>
+  <on_poweroff>destroy</on_poweroff>
+  <on_reboot>restart</on_reboot>
+  <on_crash>destroy</on_crash>
+  <features>
+    <async-teardown enabled='yes'/>
+  </features>
+  <devices>
+    <emulator>/usr/bin/qemu-system-x86_64</emulator>
+    <disk type='block' device='disk'>
+      <source dev='/dev/HostVG/QEMUGuest1'/>
+      <target dev='hda' bus='ide'/>
+      <address type='drive' controller='0' bus='0' target='0' unit='0'/>
+    </disk>
+    <controller type='usb' index='0'/>
+    <controller type='fdc' index='0'/>
+    <controller type='ide' index='0'/>
+    <controller type='pci' index='0' model='pci-root'/>
+    <memballoon model='virtio'/>
+  </devices>
+</domain>

tests/qemuxml2argvdata/s390-async-teardown-disabled.s390x-6.0.0.args

@@ -0,0 +1,35 @@
+LC_ALL=C \
+PATH=/bin \
+HOME=/var/lib/libvirt/qemu/domain--1-QEMUGuest1 \
+USER=test \
+LOGNAME=test \
+XDG_DATA_HOME=/var/lib/libvirt/qemu/domain--1-QEMUGuest1/.local/share \
+XDG_CACHE_HOME=/var/lib/libvirt/qemu/domain--1-QEMUGuest1/.cache \
+XDG_CONFIG_HOME=/var/lib/libvirt/qemu/domain--1-QEMUGuest1/.config \
+/usr/bin/qemu-system-s390x \
+-name guest=QEMUGuest1,debug-threads=on \
+-S \
+-object '{"qom-type":"secret","id":"masterKey0","format":"raw","file":"/var/lib/libvirt/qemu/domain--1-QEMUGuest1/master-key.aes"}' \
+-machine s390-ccw-virtio-6.0,usb=off,dump-guest-core=off,memory-backend=s390.ram \
+-accel tcg \
+-cpu qemu \
+-m size=262144k \
+-object '{"qom-type":"memory-backend-ram","id":"s390.ram","size":268435456}' \
+-overcommit mem-lock=off \
+-smp 1,sockets=1,cores=1,threads=1 \
+-uuid 9aa4b45c-b9dd-45ef-91fe-862b27b4231f \
+-display none \
+-no-user-config \
+-nodefaults \
+-chardev socket,id=charmonitor,fd=1729,server=on,wait=off \
+-mon chardev=charmonitor,id=monitor,mode=control \
+-rtc base=utc \
+-no-shutdown \
+-boot strict=on \
+-device virtio-serial-ccw,id=virtio-serial0,devno=fe.0.0000 \
+-chardev pty,id=charconsole0 \
+-device virtconsole,chardev=charconsole0,id=console0 \
+-audiodev '{"id":"audio1","driver":"none"}' \
+-device virtio-balloon-ccw,id=balloon0,devno=fe.0.0001 \
+-sandbox on,obsolete=deny,elevateprivileges=deny,spawn=deny,resourcecontrol=deny \
+-msg timestamp=on

tests/qemuxml2argvdata/s390-async-teardown-disabled.s390x-latest.args

@@ -0,0 +1,36 @@
+LC_ALL=C \
+PATH=/bin \
+HOME=/var/lib/libvirt/qemu/domain--1-QEMUGuest1 \
+USER=test \
+LOGNAME=test \
+XDG_DATA_HOME=/var/lib/libvirt/qemu/domain--1-QEMUGuest1/.local/share \
+XDG_CACHE_HOME=/var/lib/libvirt/qemu/domain--1-QEMUGuest1/.cache \
+XDG_CONFIG_HOME=/var/lib/libvirt/qemu/domain--1-QEMUGuest1/.config \
+/usr/bin/qemu-system-s390x \
+-name guest=QEMUGuest1,debug-threads=on \
+-S \
+-object '{"qom-type":"secret","id":"masterKey0","format":"raw","file":"/var/lib/libvirt/qemu/domain--1-QEMUGuest1/master-key.aes"}' \
+-machine s390-ccw-virtio,usb=off,dump-guest-core=off,memory-backend=s390.ram \
+-accel tcg \
+-cpu qemu \
+-m size=262144k \
+-object '{"qom-type":"memory-backend-ram","id":"s390.ram","size":268435456}' \
+-overcommit mem-lock=off \
+-smp 1,sockets=1,cores=1,threads=1 \
+-uuid 9aa4b45c-b9dd-45ef-91fe-862b27b4231f \
+-display none \
+-no-user-config \
+-nodefaults \
+-chardev socket,id=charmonitor,fd=1729,server=on,wait=off \
+-mon chardev=charmonitor,id=monitor,mode=control \
+-rtc base=utc \
+-no-shutdown \
+-boot strict=on \
+-device '{"driver":"virtio-serial-ccw","id":"virtio-serial0","devno":"fe.0.0000"}' \
+-chardev pty,id=charconsole0 \
+-device '{"driver":"virtconsole","chardev":"charconsole0","id":"console0"}' \
+-audiodev '{"id":"audio1","driver":"none"}' \
+-device '{"driver":"virtio-balloon-ccw","id":"balloon0","devno":"fe.0.0001"}' \
+-sandbox on,obsolete=deny,elevateprivileges=deny,spawn=deny,resourcecontrol=deny \
+-run-with async-teardown=off \
+-msg timestamp=on

tests/qemuxml2argvdata/s390-async-teardown-disabled.xml

@@ -0,0 +1,24 @@
+<domain type='qemu'>
+  <name>QEMUGuest1</name>
+  <uuid>9aa4b45c-b9dd-45ef-91fe-862b27b4231f</uuid>
+  <memory>262144</memory>
+  <currentMemory>262144</currentMemory>
+  <os>
+    <type arch='s390x' machine='s390-ccw-virtio'>hvm</type>
+  </os>
+  <clock offset='utc'/>
+  <on_poweroff>destroy</on_poweroff>
+  <on_reboot>restart</on_reboot>
+  <on_crash>destroy</on_crash>
+  <features>
+    <async-teardown enabled='no'/>
+  </features>
+  <devices>
+    <emulator>/usr/bin/qemu-system-s390x</emulator>
+    <controller type='virtio-serial' index='0'>
+    </controller>
+    <console type='pty'>
+      <target type='virtio'/>
+    </console>
+  </devices>
+</domain>

tests/qemuxml2argvdata/s390-async-teardown-no-attrib.s390x-latest.args

@@ -0,0 +1,36 @@
+LC_ALL=C \
+PATH=/bin \
+HOME=/var/lib/libvirt/qemu/domain--1-QEMUGuest1 \
+USER=test \
+LOGNAME=test \
+XDG_DATA_HOME=/var/lib/libvirt/qemu/domain--1-QEMUGuest1/.local/share \
+XDG_CACHE_HOME=/var/lib/libvirt/qemu/domain--1-QEMUGuest1/.cache \
+XDG_CONFIG_HOME=/var/lib/libvirt/qemu/domain--1-QEMUGuest1/.config \
+/usr/bin/qemu-system-s390x \
+-name guest=QEMUGuest1,debug-threads=on \
+-S \
+-object '{"qom-type":"secret","id":"masterKey0","format":"raw","file":"/var/lib/libvirt/qemu/domain--1-QEMUGuest1/master-key.aes"}' \
+-machine s390-ccw-virtio,usb=off,dump-guest-core=off,memory-backend=s390.ram \
+-accel tcg \
+-cpu qemu \
+-m size=262144k \
+-object '{"qom-type":"memory-backend-ram","id":"s390.ram","size":268435456}' \
+-overcommit mem-lock=off \
+-smp 1,sockets=1,cores=1,threads=1 \
+-uuid 9aa4b45c-b9dd-45ef-91fe-862b27b4231f \
+-display none \
+-no-user-config \
+-nodefaults \
+-chardev socket,id=charmonitor,fd=1729,server=on,wait=off \
+-mon chardev=charmonitor,id=monitor,mode=control \
+-rtc base=utc \
+-no-shutdown \
+-boot strict=on \
+-device '{"driver":"virtio-serial-ccw","id":"virtio-serial0","devno":"fe.0.0000"}' \
+-chardev pty,id=charconsole0 \
+-device '{"driver":"virtconsole","chardev":"charconsole0","id":"console0"}' \
+-audiodev '{"id":"audio1","driver":"none"}' \
+-device '{"driver":"virtio-balloon-ccw","id":"balloon0","devno":"fe.0.0001"}' \
+-sandbox on,obsolete=deny,elevateprivileges=deny,spawn=deny,resourcecontrol=deny \
+-run-with async-teardown=on \
+-msg timestamp=on

tests/qemuxml2argvdata/s390-async-teardown-no-attrib.xml

@@ -0,0 +1,24 @@
+<domain type='qemu'>
+  <name>QEMUGuest1</name>
+  <uuid>9aa4b45c-b9dd-45ef-91fe-862b27b4231f</uuid>
+  <memory>262144</memory>
+  <currentMemory>262144</currentMemory>
+  <os>
+    <type arch='s390x' machine='s390-ccw-virtio'>hvm</type>
+  </os>
+  <clock offset='utc'/>
+  <on_poweroff>destroy</on_poweroff>
+  <on_reboot>restart</on_reboot>
+  <on_crash>destroy</on_crash>
+  <features>
+    <async-teardown/>
+  </features>
+  <devices>
+    <emulator>/usr/bin/qemu-system-s390x</emulator>
+    <controller type='virtio-serial' index='0'>
+    </controller>
+    <console type='pty'>
+      <target type='virtio'/>
+    </console>
+  </devices>
+</domain>

tests/qemuxml2argvdata/s390-async-teardown.s390x-6.0.0.err

@@ -0,0 +1 @@
+unsupported configuration: asynchronous teardown is not available with this QEMU binary

tests/qemuxml2argvdata/s390-async-teardown.s390x-latest.args

@@ -0,0 +1,36 @@
+LC_ALL=C \
+PATH=/bin \
+HOME=/var/lib/libvirt/qemu/domain--1-QEMUGuest1 \
+USER=test \
+LOGNAME=test \
+XDG_DATA_HOME=/var/lib/libvirt/qemu/domain--1-QEMUGuest1/.local/share \
+XDG_CACHE_HOME=/var/lib/libvirt/qemu/domain--1-QEMUGuest1/.cache \
+XDG_CONFIG_HOME=/var/lib/libvirt/qemu/domain--1-QEMUGuest1/.config \
+/usr/bin/qemu-system-s390x \
+-name guest=QEMUGuest1,debug-threads=on \
+-S \
+-object '{"qom-type":"secret","id":"masterKey0","format":"raw","file":"/var/lib/libvirt/qemu/domain--1-QEMUGuest1/master-key.aes"}' \
+-machine s390-ccw-virtio,usb=off,dump-guest-core=off,memory-backend=s390.ram \
+-accel tcg \
+-cpu qemu \
+-m size=262144k \
+-object '{"qom-type":"memory-backend-ram","id":"s390.ram","size":268435456}' \
+-overcommit mem-lock=off \
+-smp 1,sockets=1,cores=1,threads=1 \
+-uuid 9aa4b45c-b9dd-45ef-91fe-862b27b4231f \
+-display none \
+-no-user-config \
+-nodefaults \
+-chardev socket,id=charmonitor,fd=1729,server=on,wait=off \
+-mon chardev=charmonitor,id=monitor,mode=control \
+-rtc base=utc \
+-no-shutdown \
+-boot strict=on \
+-device '{"driver":"virtio-serial-ccw","id":"virtio-serial0","devno":"fe.0.0000"}' \
+-chardev pty,id=charconsole0 \
+-device '{"driver":"virtconsole","chardev":"charconsole0","id":"console0"}' \
+-audiodev '{"id":"audio1","driver":"none"}' \
+-device '{"driver":"virtio-balloon-ccw","id":"balloon0","devno":"fe.0.0001"}' \
+-sandbox on,obsolete=deny,elevateprivileges=deny,spawn=deny,resourcecontrol=deny \
+-run-with async-teardown=on \
+-msg timestamp=on

tests/qemuxml2argvdata/s390-async-teardown.xml

@@ -0,0 +1,24 @@
+<domain type='qemu'>
+  <name>QEMUGuest1</name>
+  <uuid>9aa4b45c-b9dd-45ef-91fe-862b27b4231f</uuid>
+  <memory>262144</memory>
+  <currentMemory>262144</currentMemory>
+  <os>
+    <type arch='s390x' machine='s390-ccw-virtio'>hvm</type>
+  </os>
+  <clock offset='utc'/>
+  <on_poweroff>destroy</on_poweroff>
+  <on_reboot>restart</on_reboot>
+  <on_crash>destroy</on_crash>
+  <features>
+    <async-teardown enabled='yes'/>
+  </features>
+  <devices>
+    <emulator>/usr/bin/qemu-system-s390x</emulator>
+    <controller type='virtio-serial' index='0'>
+    </controller>
+    <console type='pty'>
+      <target type='virtio'/>
+    </console>
+  </devices>
+</domain>

tests/qemuxml2argvtest.c

@@ -2701,6 +2701,13 @@ mymain(void)
 
     DO_TEST_CAPS_LATEST("crypto-builtin");
 
+    DO_TEST_CAPS_LATEST("async-teardown");
+    DO_TEST_CAPS_ARCH_LATEST("s390-async-teardown", "s390x");
+    DO_TEST_CAPS_ARCH_LATEST("s390-async-teardown-no-attrib", "s390x");
+    DO_TEST_CAPS_ARCH_VER_PARSE_ERROR("s390-async-teardown", "s390x", "6.0.0");
+    DO_TEST_CAPS_ARCH_LATEST("s390-async-teardown-disabled", "s390x");
+    DO_TEST_CAPS_ARCH_VER("s390-async-teardown-disabled", "s390x", "6.0.0");
+
     qemuTestDriverFree(&driver);
     virFileWrapperClearPrefixes();
 

tests/qemuxml2xmloutdata/async-teardown.x86_64-latest.xml

@@ -0,0 +1,44 @@
+<domain type='qemu'>
+  <name>QEMUGuest1</name>
+  <uuid>c7a5fdbd-edaf-9455-926a-d65c16db1809</uuid>
+  <memory unit='KiB'>219136</memory>
+  <currentMemory unit='KiB'>219136</currentMemory>
+  <vcpu placement='static'>1</vcpu>
+  <os>
+    <type arch='x86_64' machine='pc'>hvm</type>
+    <boot dev='hd'/>
+  </os>
+  <features>
+    <async-teardown enabled='yes'/>
+  </features>
+  <cpu mode='custom' match='exact' check='none'>
+    <model fallback='forbid'>qemu64</model>
+  </cpu>
+  <clock offset='utc'/>
+  <on_poweroff>destroy</on_poweroff>
+  <on_reboot>restart</on_reboot>
+  <on_crash>destroy</on_crash>
+  <devices>
+    <emulator>/usr/bin/qemu-system-x86_64</emulator>
+    <disk type='block' device='disk'>
+      <driver name='qemu' type='raw'/>
+      <source dev='/dev/HostVG/QEMUGuest1'/>
+      <target dev='hda' bus='ide'/>
+      <address type='drive' controller='0' bus='0' target='0' unit='0'/>
+    </disk>
+    <controller type='usb' index='0' model='piix3-uhci'>
+      <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x2'/>
+    </controller>
+    <controller type='fdc' index='0'/>
+    <controller type='ide' index='0'>
+      <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x1'/>
+    </controller>
+    <controller type='pci' index='0' model='pci-root'/>
+    <input type='mouse' bus='ps2'/>
+    <input type='keyboard' bus='ps2'/>
+    <audio id='1' type='none'/>
+    <memballoon model='virtio'>
+      <address type='pci' domain='0x0000' bus='0x00' slot='0x02' function='0x0'/>
+    </memballoon>
+  </devices>
+</domain>

tests/qemuxml2xmloutdata/s390-async-teardown-disabled.s390x-6.0.0.xml

@@ -0,0 +1,36 @@
+<domain type='qemu'>
+  <name>QEMUGuest1</name>
+  <uuid>9aa4b45c-b9dd-45ef-91fe-862b27b4231f</uuid>
+  <memory unit='KiB'>262144</memory>
+  <currentMemory unit='KiB'>262144</currentMemory>
+  <vcpu placement='static'>1</vcpu>
+  <os>
+    <type arch='s390x' machine='s390-ccw-virtio-6.0'>hvm</type>
+    <boot dev='hd'/>
+  </os>
+  <features>
+    <async-teardown enabled='no'/>
+  </features>
+  <cpu mode='custom' match='exact' check='none'>
+    <model fallback='forbid'>qemu</model>
+  </cpu>
+  <clock offset='utc'/>
+  <on_poweroff>destroy</on_poweroff>
+  <on_reboot>restart</on_reboot>
+  <on_crash>destroy</on_crash>
+  <devices>
+    <emulator>/usr/bin/qemu-system-s390x</emulator>
+    <controller type='virtio-serial' index='0'>
+      <address type='ccw' cssid='0xfe' ssid='0x0' devno='0x0000'/>
+    </controller>
+    <controller type='pci' index='0' model='pci-root'/>
+    <console type='pty'>
+      <target type='virtio' port='0'/>
+    </console>
+    <audio id='1' type='none'/>
+    <memballoon model='virtio'>
+      <address type='ccw' cssid='0xfe' ssid='0x0' devno='0x0001'/>
+    </memballoon>
+    <panic model='s390'/>
+  </devices>
+</domain>

tests/qemuxml2xmloutdata/s390-async-teardown-disabled.s390x-latest.xml

@@ -0,0 +1,36 @@
+<domain type='qemu'>
+  <name>QEMUGuest1</name>
+  <uuid>9aa4b45c-b9dd-45ef-91fe-862b27b4231f</uuid>
+  <memory unit='KiB'>262144</memory>
+  <currentMemory unit='KiB'>262144</currentMemory>
+  <vcpu placement='static'>1</vcpu>
+  <os>
+    <type arch='s390x' machine='s390-ccw-virtio'>hvm</type>
+    <boot dev='hd'/>
+  </os>
+  <features>
+    <async-teardown enabled='no'/>
+  </features>
+  <cpu mode='custom' match='exact' check='none'>
+    <model fallback='forbid'>qemu</model>
+  </cpu>
+  <clock offset='utc'/>
+  <on_poweroff>destroy</on_poweroff>
+  <on_reboot>restart</on_reboot>
+  <on_crash>destroy</on_crash>
+  <devices>
+    <emulator>/usr/bin/qemu-system-s390x</emulator>
+    <controller type='virtio-serial' index='0'>
+      <address type='ccw' cssid='0xfe' ssid='0x0' devno='0x0000'/>
+    </controller>
+    <controller type='pci' index='0' model='pci-root'/>
+    <console type='pty'>
+      <target type='virtio' port='0'/>
+    </console>
+    <audio id='1' type='none'/>
+    <memballoon model='virtio'>
+      <address type='ccw' cssid='0xfe' ssid='0x0' devno='0x0001'/>
+    </memballoon>
+    <panic model='s390'/>
+  </devices>
+</domain>

tests/qemuxml2xmloutdata/s390-async-teardown-no-attrib.s390x-latest.xml

@@ -0,0 +1,36 @@
+<domain type='qemu'>
+  <name>QEMUGuest1</name>
+  <uuid>9aa4b45c-b9dd-45ef-91fe-862b27b4231f</uuid>
+  <memory unit='KiB'>262144</memory>
+  <currentMemory unit='KiB'>262144</currentMemory>
+  <vcpu placement='static'>1</vcpu>
+  <os>
+    <type arch='s390x' machine='s390-ccw-virtio'>hvm</type>
+    <boot dev='hd'/>
+  </os>
+  <features>
+    <async-teardown enabled='yes'/>
+  </features>
+  <cpu mode='custom' match='exact' check='none'>
+    <model fallback='forbid'>qemu</model>
+  </cpu>
+  <clock offset='utc'/>
+  <on_poweroff>destroy</on_poweroff>
+  <on_reboot>restart</on_reboot>
+  <on_crash>destroy</on_crash>
+  <devices>
+    <emulator>/usr/bin/qemu-system-s390x</emulator>
+    <controller type='virtio-serial' index='0'>
+      <address type='ccw' cssid='0xfe' ssid='0x0' devno='0x0000'/>
+    </controller>
+    <controller type='pci' index='0' model='pci-root'/>
+    <console type='pty'>
+      <target type='virtio' port='0'/>
+    </console>
+    <audio id='1' type='none'/>
+    <memballoon model='virtio'>
+      <address type='ccw' cssid='0xfe' ssid='0x0' devno='0x0001'/>
+    </memballoon>
+    <panic model='s390'/>
+  </devices>
+</domain>

tests/qemuxml2xmloutdata/s390-async-teardown.s390x-latest.xml

@@ -0,0 +1,36 @@
+<domain type='qemu'>
+  <name>QEMUGuest1</name>
+  <uuid>9aa4b45c-b9dd-45ef-91fe-862b27b4231f</uuid>
+  <memory unit='KiB'>262144</memory>
+  <currentMemory unit='KiB'>262144</currentMemory>
+  <vcpu placement='static'>1</vcpu>
+  <os>
+    <type arch='s390x' machine='s390-ccw-virtio'>hvm</type>
+    <boot dev='hd'/>
+  </os>
+  <features>
+    <async-teardown enabled='yes'/>
+  </features>
+  <cpu mode='custom' match='exact' check='none'>
+    <model fallback='forbid'>qemu</model>
+  </cpu>
+  <clock offset='utc'/>
+  <on_poweroff>destroy</on_poweroff>
+  <on_reboot>restart</on_reboot>
+  <on_crash>destroy</on_crash>
+  <devices>
+    <emulator>/usr/bin/qemu-system-s390x</emulator>
+    <controller type='virtio-serial' index='0'>
+      <address type='ccw' cssid='0xfe' ssid='0x0' devno='0x0000'/>
+    </controller>
+    <controller type='pci' index='0' model='pci-root'/>
+    <console type='pty'>
+      <target type='virtio' port='0'/>
+    </console>
+    <audio id='1' type='none'/>
+    <memballoon model='virtio'>
+      <address type='ccw' cssid='0xfe' ssid='0x0' devno='0x0001'/>
+    </memballoon>
+    <panic model='s390'/>
+  </devices>
+</domain>

tests/qemuxml2xmltest.c

@@ -1241,6 +1241,12 @@ mymain(void)
     DO_TEST_CAPS_LATEST("cpu-phys-bits-limit");
     DO_TEST_CAPS_LATEST("cpu-phys-bits-emulate-bare");
 
+    DO_TEST_CAPS_LATEST("async-teardown");
+    DO_TEST_CAPS_ARCH_LATEST("s390-async-teardown", "s390x");
+    DO_TEST_CAPS_ARCH_LATEST("s390-async-teardown-no-attrib", "s390x");
+    DO_TEST_CAPS_ARCH_LATEST("s390-async-teardown-disabled", "s390x");
+    DO_TEST_CAPS_ARCH_VER("s390-async-teardown-disabled", "s390x", "6.0.0");
+
  cleanup:
     qemuTestDriverFree(&driver);
     virFileWrapperClearPrefixes();