Use host-passthrough mode of CPU virtualization

Signed-off-by: Panwar, Ashish <[email protected]>

Author: apanwariisc

scripts/gen_vmconfigs.py

@@ -129,6 +129,15 @@ def add_memory_backing(config, main, child):
         page.set('size', '1048576')
         page.set('unit', 'KiB')
 
+def add_cpu_mode(main, child):
+    pos = list(main).index(child)
+    remove_tag(main, 'cpu')
+    cpu = ET.Element('cpu')
+    main.insert(pos + 1, cpu)
+    cpu.set('mode', 'host-passthrough')
+    cpu.set('check', 'partial')
+
+
 
 # -- the following tags are important
 # 1. os: update to booth VM with mitosis kernel
@@ -152,6 +161,8 @@ def rewrite_config(config):
         if child.tag == 'currentMemory':
             child.text = str(get_memory_size(config))
             add_memory_backing(config, main, child)
+        if child.tag == 'cpu':
+            add_cpu_mode(main, child)
 
     tree.write(src)
 

vmconfigs/samples/1GBHUGE.xml

@@ -47,9 +47,7 @@
     <acpi/>
     <apic/>
   </features>
-  <cpu check="partial" match="exact" mode="custom">
-    <model fallback="allow">EPYC-IBPB</model>
-  </cpu>
+  <cpu check="partial" mode="host-passthrough"/>
   <clock offset="utc">
     <timer name="rtc" tickpolicy="catchup"/>
     <timer name="pit" tickpolicy="delay"/>

vmconfigs/samples/2MBHUGE.xml

@@ -47,9 +47,7 @@
     <acpi/>
     <apic/>
   </features>
-  <cpu check="partial" match="exact" mode="custom">
-    <model fallback="allow">EPYC-IBPB</model>
-  </cpu>
+  <cpu check="partial" mode="host-passthrough"/>
   <clock offset="utc">
     <timer name="rtc" tickpolicy="catchup"/>
     <timer name="pit" tickpolicy="delay"/>

vmconfigs/samples/4KB.xml

@@ -42,9 +42,7 @@
     <acpi/>
     <apic/>
   </features>
-  <cpu check="partial" match="exact" mode="custom">
-    <model fallback="allow">EPYC-IBPB</model>
-  </cpu>
+  <cpu check="partial" mode="host-passthrough"/>
   <clock offset="utc">
     <timer name="rtc" tickpolicy="catchup"/>
     <timer name="pit" tickpolicy="delay"/>

vmconfigs/samples/HAWKEYE.xml

@@ -42,9 +42,7 @@
     <acpi/>
     <apic/>
   </features>
-  <cpu check="partial" match="exact" mode="custom">
-    <model fallback="allow">EPYC-IBPB</model>
-  </cpu>
+  <cpu check="partial" mode="host-passthrough"/>
   <clock offset="utc">
     <timer name="rtc" tickpolicy="catchup"/>
     <timer name="pit" tickpolicy="delay"/>