qemu: Add capability for IBS pSeries feature

IBS (Indirect Branch Speculation) is the last capability added
in QEMU 2.12 related to Spectre mitigation for Power. It was
added in commit 4be8d4e7d935.

This patch introduces it as QEMU_CAPS_MACHINE_PSERIES_CAP_IBS.
Like CFPC and SBBC, users might want to tune in IBS based on
their HW and guest OS requirements, and it's better to do it
so in a proper Libvirt feature than to put QEMU arguments
in the middle of the domain XML.
Signed-off-by: NDaniel Henrique Barboza <danielhb413@gmail.com>
Reviewed-by: NMichal Privoznik <mprivozn@redhat.com>

src/qemu/qemu_capabilities.c

@@ -578,6 +578,7 @@ VIR_ENUM_IMPL(virQEMUCaps,
 
               /* 365 */
               "machine.pseries.cap-sbbc",
+              "machine.pseries.cap-ibs",
     );
 
 
@@ -1623,6 +1624,7 @@ static struct virQEMUCapsStringFlags virQEMUCapsMachinePropsPSeries[] = {
     { "cap-ccf-assist", QEMU_CAPS_MACHINE_PSERIES_CAP_CCF_ASSIST },
     { "cap-cfpc", QEMU_CAPS_MACHINE_PSERIES_CAP_CFPC },
     { "cap-sbbc", QEMU_CAPS_MACHINE_PSERIES_CAP_SBBC },
+    { "cap-ibs", QEMU_CAPS_MACHINE_PSERIES_CAP_IBS },
 };
 
 static struct virQEMUCapsStringFlags virQEMUCapsMachinePropsVirt[] = {

src/qemu/qemu_capabilities.h

@@ -559,6 +559,7 @@ typedef enum { /* virQEMUCapsFlags grouping marker for syntax-check */
 
     /* 365 */
     QEMU_CAPS_MACHINE_PSERIES_CAP_SBBC, /* -machine pseries.cap-sbbc */
+    QEMU_CAPS_MACHINE_PSERIES_CAP_IBS, /* -machine pseries.cap-ibs */
 
     QEMU_CAPS_LAST /* this must always be the last item */
 } virQEMUCapsFlags;

tests/qemucapabilitiesdata/caps_2.12.0.ppc64.xml

@@ -156,6 +156,7 @@
   <flag name='i8042'/>
   <flag name='machine.pseries.cap-cfpc'/>
   <flag name='machine.pseries.cap-sbbc'/>
+  <flag name='machine.pseries.cap-ibs'/>
   <version>2011090</version>
   <kvmVersion>0</kvmVersion>
   <microcodeVersion>42900289</microcodeVersion>

tests/qemucapabilitiesdata/caps_3.0.0.ppc64.xml

@@ -158,6 +158,7 @@
   <flag name='i8042'/>
   <flag name='machine.pseries.cap-cfpc'/>
   <flag name='machine.pseries.cap-sbbc'/>
+  <flag name='machine.pseries.cap-ibs'/>
   <version>2012050</version>
   <kvmVersion>0</kvmVersion>
   <microcodeVersion>42900239</microcodeVersion>

tests/qemucapabilitiesdata/caps_3.1.0.ppc64.xml

@@ -163,6 +163,7 @@
   <flag name='storage.werror'/>
   <flag name='machine.pseries.cap-cfpc'/>
   <flag name='machine.pseries.cap-sbbc'/>
+  <flag name='machine.pseries.cap-ibs'/>
   <version>3000091</version>
   <kvmVersion>0</kvmVersion>
   <microcodeVersion>42900240</microcodeVersion>

tests/qemucapabilitiesdata/caps_4.0.0.ppc64.xml

@@ -177,6 +177,7 @@
   <flag name='storage.werror'/>
   <flag name='machine.pseries.cap-cfpc'/>
   <flag name='machine.pseries.cap-sbbc'/>
+  <flag name='machine.pseries.cap-ibs'/>
   <version>4000000</version>
   <kvmVersion>0</kvmVersion>
   <microcodeVersion>42900240</microcodeVersion>

tests/qemucapabilitiesdata/caps_4.2.0.ppc64.xml

@@ -182,6 +182,7 @@
   <flag name='storage.werror'/>
   <flag name='machine.pseries.cap-cfpc'/>
   <flag name='machine.pseries.cap-sbbc'/>
+  <flag name='machine.pseries.cap-ibs'/>
   <version>4001050</version>
   <kvmVersion>0</kvmVersion>
   <microcodeVersion>42900242</microcodeVersion>

tests/qemucapabilitiesdata/caps_5.0.0.ppc64.xml

@@ -194,6 +194,7 @@
   <flag name='virtio.packed'/>
   <flag name='machine.pseries.cap-cfpc'/>
   <flag name='machine.pseries.cap-sbbc'/>
+  <flag name='machine.pseries.cap-ibs'/>
   <version>4002050</version>
   <kvmVersion>0</kvmVersion>
   <microcodeVersion>42900241</microcodeVersion>