[libvirt] [PATCH 1/2] qemu: Add support for gic-version machine option

[Pavel Fedin]

Support for GICv3 has been recently introduced in qemu using gic-version
option for the 'virt' machine. The option can actually take values of
'2', '3' and 'host', however, since in libvirt this is a numeric
parameter, we limit it only to 2 and 3. Value of 2 is not added to the
command line in order to keep backward compatibility with older qemu
versions.

Signed-off-by: Pavel Fedin <p.fedin at samsung.com>
---
 src/qemu/qemu_command.c | 22 +++++++++-------------
 1 file changed, 9 insertions(+), 13 deletions(-)

diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c
index bb1835c..eaefc1b 100644
--- a/src/qemu/qemu_command.c
+++ b/src/qemu/qemu_command.c
@@ -7702,19 +7702,6 @@ qemuBuildCpuArgStr(virQEMUDriverPtr driver,
         have_cpu = true;
     }
 
-    if (def->features[VIR_DOMAIN_FEATURE_GIC] == VIR_TRISTATE_SWITCH_ON) {
-        if (def->gic_version && def->gic_version != 2) {
-            virReportError(VIR_ERR_CONFIG_UNSUPPORTED,
-                           _("gic version '%u' is not supported"),
-                           def->gic_version);
-            goto cleanup;
-        }
-
-        /* There's no command line argument currently to turn on/off GIC. It's
-         * done automatically by qemu-system-aarch64. But if this changes, lets
-         * put the code here. */
-    }
-
     if (virBufferCheckError(&buf) < 0)
         goto cleanup;
 
@@ -7931,6 +7918,15 @@ qemuBuildMachineArgStr(virCommandPtr cmd,
             return -1;
         }
 
+	if (def->features[VIR_DOMAIN_FEATURE_GIC] == VIR_TRISTATE_SWITCH_ON) {
+	    if (def->gic_version && (def->gic_version != 2)) {
+	        /* 2 is the default, so we don't put it as option for
+	         * backwards compatibility
+	         */
+                virBufferAsprintf(&buf, ",gic-version=%d", def->gic_version);
+	    }
+	}
+
         virCommandAddArgBuffer(cmd, &buf);
     }
 
-- 
2.1.4