conf: qemu: add support for Hyper-V reenlightenment notifications

Qemu-3.0 supports so-called 'Reenlightenment' notifications and this (in
conjunction with 'hv-frequencies') can be used make Hyper-V on KVM pass
stable TSC page clocksource to L2 guests.

Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Reviewed-by: John Ferlan <jferlan@redhat.com>

tests/qemuxml2argvdata/hyperv-off.xml

@@ -21,6 +21,7 @@
       <reset state='off'/>
       <vendor_id state='off'/>
       <frequencies state='off'/>
+      <reenlightenment state='off'/>
     </hyperv>
   </features>
   <clock offset='utc'/>

tests/qemuxml2argvdata/hyperv.args

@@ -9,7 +9,8 @@ QEMU_AUDIO_DRV=none \
 -S \
 -machine pc,accel=tcg,usb=off,dump-guest-core=off \
 -cpu 'qemu32,hv_relaxed,hv_vapic,hv_spinlocks=0x2fff,hv_vpindex,hv_runtime,\
-hv_synic,hv_stimer,hv_reset,hv_vendor_id=KVM Hv,hv_frequencies' \
+hv_synic,hv_stimer,hv_reset,hv_vendor_id=KVM Hv,hv_frequencies,\
+hv_reenlightenment' \
 -m 214 \
 -smp 6,sockets=6,cores=1,threads=1 \
 -uuid c7a5fdbd-edaf-9455-926a-d65c16db1809 \

tests/qemuxml2argvdata/hyperv.xml

@@ -21,6 +21,7 @@
       <reset state='on'/>
       <vendor_id state='on' value='KVM Hv'/>
       <frequencies state='on'/>
+      <reenlightenment state='on'/>
     </hyperv>
   </features>
   <clock offset='utc'/>

tests/qemuxml2xmloutdata/hyperv-off.xml

@@ -21,6 +21,7 @@
       <reset state='off'/>
       <vendor_id state='off'/>
       <frequencies state='off'/>
+      <reenlightenment state='off'/>
     </hyperv>
   </features>
   <clock offset='utc'/>

tests/qemuxml2xmloutdata/hyperv.xml

@@ -21,6 +21,7 @@
       <reset state='on'/>
       <vendor_id state='on' value='KVM Hv'/>
       <frequencies state='on'/>
+      <reenlightenment state='on'/>
     </hyperv>
   </features>
   <clock offset='utc'/>