cpu: add CLZERO CPUID support for AMD platforms

Qemu commit e900135dcfb67 ("i386: Add CPUID bit for CLZERO and XSAVEERPTR")
adds support for CLZERO CPUID bit.
This commit extends support for this CPUID bit into libvirt.

Signed-off-by: Ani Sinha <ani.sinha@nutanix.com>
Message-Id: <1575371352-99055-1-git-send-email-ani.sinha@nutanix.com>
Reviewed-by: Jiri Denemark <jdenemar@redhat.com>

src/cpu_map/x86_features.xml

@@ -467,6 +467,9 @@
   </feature>
 
   <!-- More AMD-specific features -->
+  <feature name='clzero'>
+    <cpuid eax_in='0x80000008' ebx='0x00000001'/>
+  </feature>
   <feature name='wbnoinvd'>
     <cpuid eax_in='0x80000008' ebx='0x00000200'/>
   </feature>

tests/cputestdata/x86_64-cpuid-EPYC-7601-32-Core-guest.xml

@@ -13,4 +13,5 @@
   <feature policy='require' name='perfctr_core'/>
   <feature policy='require' name='perfctr_nb'/>
   <feature policy='require' name='invtsc'/>
+  <feature policy='require' name='clzero'/>
 </cpu>

tests/cputestdata/x86_64-cpuid-EPYC-7601-32-Core-host.xml

@@ -14,4 +14,5 @@
   <feature name='perfctr_core'/>
   <feature name='perfctr_nb'/>
   <feature name='invtsc'/>
+  <feature name='clzero'/>
 </cpu>

tests/cputestdata/x86_64-cpuid-EPYC-7601-32-Core-ibpb-guest.xml

@@ -13,5 +13,6 @@
   <feature policy='require' name='perfctr_core'/>
   <feature policy='require' name='perfctr_nb'/>
   <feature policy='require' name='invtsc'/>
+  <feature policy='require' name='clzero'/>
   <feature policy='disable' name='rdtscp'/>
 </cpu>

tests/cputestdata/x86_64-cpuid-EPYC-7601-32-Core-ibpb-host.xml

@@ -14,4 +14,5 @@
   <feature name='perfctr_core'/>
   <feature name='perfctr_nb'/>
   <feature name='invtsc'/>
+  <feature name='clzero'/>
 </cpu>

tests/cputestdata/x86_64-cpuid-Hygon-C86-7185-32-core-guest.xml

@@ -13,4 +13,5 @@
   <feature policy='require' name='perfctr_core'/>
   <feature policy='require' name='perfctr_nb'/>
   <feature policy='require' name='invtsc'/>
+  <feature policy='require' name='clzero'/>
 </cpu>

tests/cputestdata/x86_64-cpuid-Hygon-C86-7185-32-core-host.xml

@@ -14,4 +14,5 @@
   <feature name='perfctr_core'/>
   <feature name='perfctr_nb'/>
   <feature name='invtsc'/>
+  <feature name='clzero'/>
 </cpu>

tests/cputestdata/x86_64-cpuid-Ryzen-7-1800X-Eight-Core-guest.xml

@@ -13,4 +13,5 @@
   <feature policy='require' name='perfctr_core'/>
   <feature policy='require' name='perfctr_nb'/>
   <feature policy='require' name='invtsc'/>
+  <feature policy='require' name='clzero'/>
 </cpu>

tests/cputestdata/x86_64-cpuid-Ryzen-7-1800X-Eight-Core-host.xml

@@ -14,4 +14,5 @@
   <feature name='perfctr_core'/>
   <feature name='perfctr_nb'/>
   <feature name='invtsc'/>
+  <feature name='clzero'/>
 </cpu>