add support for new hyperv tag

[nanli1]

Start a guest with emsr_bitmap, xmm_input, tlbflush-direct and tlbflush-ext
Signed-off-by: nanli nanli@redhat.com
For autotest/tp-libvirt#6267

The showing xml

<hyperv mode="custom">
   <tlbflush state="on">
     <direct state="on"/>
     <extended state="on"/>
   </tlbflush>
 </hyperv>

avocado run --vt-type libvirt --vt-machine-type q35 vm_features

(01/18) type_specific.io-github-autotest-libvirt.vm_features.positive_test.hyperv.features_in_domcapabilities: STARTED
(01/18) type_specific.io-github-autotest-libvirt.vm_features.positive_test.hyperv.features_in_domcapabilities: PASS (22.22 s)
(02/18) type_specific.io-github-autotest-libvirt.vm_features.positive_test.hyperv.tlbflush: STARTED
(02/18) type_specific.io-github-autotest-libvirt.vm_features.positive_test.hyperv.tlbflush: PASS (21.91 s)
(03/18) type_specific.io-github-autotest-libvirt.vm_features.positive_test.hyperv.tlbflush_direct_extended: STARTED
(03/18) type_specific.io-github-autotest-libvirt.vm_features.positive_test.hyperv.tlbflush_direct_extended: PASS (21.90 s)
(04/18) type_specific.io-github-autotest-libvirt.vm_features.positive_test.hyperv.emsr_bitmap: STARTED
(04/18) type_specific.io-github-autotest-libvirt.vm_features.positive_test.hyperv.emsr_bitmap: PASS (22.22 s)
(05/18) type_specific.io-github-autotest-libvirt.vm_features.positive_test.hyperv.xmm_input: STARTED
(05/18) type_specific.io-github-autotest-libvirt.vm_features.positive_test.hyperv.xmm_input: PASS (22.16 s)
(06/18) type_specific.io-github-autotest-libvirt.vm_features.positive_test.hyperv.frequencies: STARTED
(06/18) type_specific.io-github-autotest-libvirt.vm_features.positive_test.hyperv.frequencies: PASS (21.99 s)
(07/18) type_specific.io-github-autotest-libvirt.vm_features.positive_test.hyperv.reenlightenment: STARTED
(07/18) type_specific.io-github-autotest-libvirt.vm_features.positive_test.hyperv.reenlightenment: PASS (22.00 s)
(08/18) type_specific.io-github-autotest-libvirt.vm_features.positive_test.hyperv.relaxed.enable: STARTED
(08/18) type_specific.io-github-autotest-libvirt.vm_features.positive_test.hyperv.relaxed.enable: PASS (21.97 s)
(09/18) type_specific.io-github-autotest-libvirt.vm_features.positive_test.hyperv.relaxed.disable: STARTED
(09/18) type_specific.io-github-autotest-libvirt.vm_features.positive_test.hyperv.relaxed.disable: PASS (21.95 s)
(10/18) type_specific.io-github-autotest-libvirt.vm_features.positive_test.pmu.enable: STARTED
(10/18) type_specific.io-github-autotest-libvirt.vm_features.positive_test.pmu.enable: PASS (21.95 s)
(11/18) type_specific.io-github-autotest-libvirt.vm_features.positive_test.pmu.disable: STARTED
(11/18) type_specific.io-github-autotest-libvirt.vm_features.positive_test.pmu.disable: PASS (22.04 s)
(12/18) type_specific.io-github-autotest-libvirt.vm_features.positive_test.pvspinlock.enable: STARTED
(12/18) type_specific.io-github-autotest-libvirt.vm_features.positive_test.pvspinlock.enable: PASS (44.48 s)
(13/18) type_specific.io-github-autotest-libvirt.vm_features.positive_test.pvspinlock.disable: STARTED
(13/18) type_specific.io-github-autotest-libvirt.vm_features.positive_test.pvspinlock.disable: PASS (21.99 s)
(14/18) type_specific.io-github-autotest-libvirt.vm_features.positive_test.kvm_hidden.enable: STARTED
(14/18) type_specific.io-github-autotest-libvirt.vm_features.positive_test.kvm_hidden.enable: PASS (43.19 s)
(15/18) type_specific.io-github-autotest-libvirt.vm_features.positive_test.kvm_hidden.disable: STARTED
(15/18) type_specific.io-github-autotest-libvirt.vm_features.positive_test.kvm_hidden.disable: PASS (23.37 s)
(16/18) type_specific.io-github-autotest-libvirt.vm_features.positive_test.kvm_poll_control.enable: STARTED
(16/18) type_specific.io-github-autotest-libvirt.vm_features.positive_test.kvm_poll_control.enable: PASS (21.94 s)
(17/18) type_specific.io-github-autotest-libvirt.vm_features.positive_test.kvm_poll_control.disable: STARTED
(17/18) type_specific.io-github-autotest-libvirt.vm_features.positive_test.kvm_poll_control.disable: PASS (21.56 s)
(18/18) type_specific.io-github-autotest-libvirt.vm_features.negative_test.hyperv.features_not_in_domcapabilities: STARTED
(18/18) type_specific.io-github-autotest-libvirt.vm_features.negative_test.hyperv.features_not_in_domcapabilities: CANCEL: Can not find an unsupported hyperv feature on the host. (6.26 s)

[cliping]

LGTM

[chloerh]

The code looks good. Could you please add an example of xml?

[nanli1]

The code looks good. Could you please add an example of xml?

hi haijiao, Thanks your reminder. Added the xml in the description above.