tests: qemu: add kvm-pv-ipi off test

Since b2757b697e
(qemu: support kvm-pv-ipi off), libvirt supports xml definition like:

      <features>
        <kvm>
          <pv-ipi state='off'/>
        </kvm>
      </features>

Add test case for this feature.

Signed-off-by: zhenwei pi <pizhenwei@bytedance.com>
Reviewed-by: Michal Privoznik <mprivozn@redhat.com>

tests/qemuxml2argvdata/kvm-features-off.args

@@ -12,7 +12,7 @@ QEMU_AUDIO_DRV=none \
 -S \
 -object secret,id=masterKey0,format=raw,file=/tmp/lib/domain--1-QEMUGuest1/master-key.aes \
 -machine pc,accel=kvm,usb=off,dump-guest-core=off \
--cpu host \
+-cpu host,kvm-pv-ipi=off \
 -m 214 \
 -realtime mlock=off \
 -smp 6,sockets=6,cores=1,threads=1 \

tests/qemuxml2argvdata/kvm-features-off.xml

@@ -14,6 +14,7 @@
       <hidden state='off'/>
       <hint-dedicated state='off'/>
       <poll-control state='off'/>
+      <pv-ipi state='off'/>
     </kvm>
   </features>
   <cpu mode='host-passthrough' check='none'/>

tests/qemuxml2argvdata/kvm-features.xml

@@ -14,6 +14,7 @@
       <hidden state='on'/>
       <hint-dedicated state='on'/>
       <poll-control state='on'/>
+      <pv-ipi state='on'/>
     </kvm>
   </features>
   <cpu mode='host-passthrough' check='none'/>

tests/qemuxml2xmloutdata/kvm-features-off.xml

@@ -14,6 +14,7 @@
       <hidden state='off'/>
       <hint-dedicated state='off'/>
       <poll-control state='off'/>
+      <pv-ipi state='off'/>
     </kvm>
   </features>
   <cpu mode='host-passthrough' check='none' migratable='off'/>

tests/qemuxml2xmloutdata/kvm-features.xml

@@ -14,6 +14,7 @@
       <hidden state='on'/>
       <hint-dedicated state='on'/>
       <poll-control state='on'/>
+      <pv-ipi state='on'/>
     </kvm>
   </features>
   <cpu mode='host-passthrough' check='none' migratable='off'/>