qemu: Probe for "unavailable-features" CPU property

It is similar to "filtered-features" property, which reports CPUID bits
corresponding to disabled features, but more general. The
"unavailable-features" property supports both CPUID and MSR features by
listing their names.

Signed-off-by: Jiri Denemark <jdenemar@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>

src/qemu/qemu_capabilities.c

@@ -531,6 +531,7 @@ VIR_ENUM_IMPL(virQEMUCaps,
               "bitmap-merge",
               "nbd-bitmap",
               "x86-max-cpu",
+              "cpu-unavailable-features",
     );
 
 
@@ -1398,6 +1399,10 @@ static struct virQEMUCapsStringFlags virQEMUCapsObjectPropsMemoryBackendMemfd[]
     { "hugetlb", QEMU_CAPS_OBJECT_MEMORY_MEMFD_HUGETLB },
 };
 
+static struct virQEMUCapsStringFlags virQEMUCapsObjectPropsMaxX86CPU[] = {
+    { "unavailable-features", QEMU_CAPS_CPU_UNAVAILABLE_FEATURES },
+};
+
 static virQEMUCapsObjectTypeProps virQEMUCapsObjectProps[] = {
     { "memory-backend-file", virQEMUCapsObjectPropsMemoryBackendFile,
       ARRAY_CARDINALITY(virQEMUCapsObjectPropsMemoryBackendFile),
@@ -1405,6 +1410,9 @@ static virQEMUCapsObjectTypeProps virQEMUCapsObjectProps[] = {
     { "memory-backend-memfd", virQEMUCapsObjectPropsMemoryBackendMemfd,
       ARRAY_CARDINALITY(virQEMUCapsObjectPropsMemoryBackendMemfd),
       QEMU_CAPS_OBJECT_MEMORY_MEMFD },
+    { "max-x86_64-cpu", virQEMUCapsObjectPropsMaxX86CPU,
+      ARRAY_CARDINALITY(virQEMUCapsObjectPropsMaxX86CPU),
+      QEMU_CAPS_X86_MAX_CPU },
 };
 
 static struct virQEMUCapsStringFlags virQEMUCapsMachinePropsPSeries[] = {

src/qemu/qemu_capabilities.h

@@ -512,6 +512,7 @@ typedef enum { /* virQEMUCapsFlags grouping marker for syntax-check */
     QEMU_CAPS_BITMAP_MERGE, /* block-dirty-bitmap-merge */
     QEMU_CAPS_NBD_BITMAP, /* nbd-server-add supports bitmap */
     QEMU_CAPS_X86_MAX_CPU, /* max-x86_64-cpu type exists */
+    QEMU_CAPS_CPU_UNAVAILABLE_FEATURES, /* "unavailable-features" CPU property */
 
     QEMU_CAPS_LAST /* this must always be the last item */
 } virQEMUCapsFlags;

tests/qemucapabilitiesdata/caps_4.1.0.x86_64.xml

@@ -205,6 +205,7 @@
   <flag name='bitmap-merge'/>
   <flag name='nbd-bitmap'/>
   <flag name='x86-max-cpu'/>
+  <flag name='cpu-unavailable-features'/>
   <version>4000050</version>
   <kvmVersion>0</kvmVersion>
   <microcodeVersion>43100759</microcodeVersion>