[libvirt] [PATCH 1/3] qemu: probe for -chardev 'fd' parameter for FD passing

[Daniel P. Berrangé]

QEMU >= 2.12 will support passing of pre-opened file descriptors for
socket based character devices.

XXXX should we include 2.12 pre-release git snapshot of capaibilities ?

Signed-off-by: Daniel P. Berrangé <berrange at redhat.com>
---
 src/qemu/qemu_capabilities.c | 2 ++
 src/qemu/qemu_capabilities.h | 1 +
 2 files changed, 3 insertions(+)

diff --git a/src/qemu/qemu_capabilities.c b/src/qemu/qemu_capabilities.c
index 3eb5ed6d1a..c20dc32126 100644
--- a/src/qemu/qemu_capabilities.c
+++ b/src/qemu/qemu_capabilities.c
@@ -459,6 +459,7 @@ VIR_ENUM_IMPL(virQEMUCaps, QEMU_CAPS_LAST,
               "pl011",
               "machine.pseries.max-cpu-compat",
               "dump-completed",
+              "chardev-fd-pass",
     );
 
 
@@ -3196,6 +3197,7 @@ static struct virQEMUCapsCommandLineProps virQEMUCapsCommandLine[] = {
     { "machine", "loadparm", QEMU_CAPS_LOADPARM },
     { "vnc", "vnc", QEMU_CAPS_VNC_MULTI_SERVERS },
     { "chardev", "reconnect", QEMU_CAPS_CHARDEV_RECONNECT },
+    { "chardev", "fd", QEMU_CAPS_CHARDEV_FD_PASS },
 };
 
 static int
diff --git a/src/qemu/qemu_capabilities.h b/src/qemu/qemu_capabilities.h
index c2ec2be193..aedf3c2d5e 100644
--- a/src/qemu/qemu_capabilities.h
+++ b/src/qemu/qemu_capabilities.h
@@ -444,6 +444,7 @@ typedef enum {
     QEMU_CAPS_DEVICE_PL011, /* -device pl011 (not user-instantiable) */
     QEMU_CAPS_MACHINE_PSERIES_MAX_CPU_COMPAT, /* -machine pseries,max-cpu-compat= */
     QEMU_CAPS_DUMP_COMPLETED, /* DUMP_COMPLETED event */
+    QEMU_CAPS_CHARDEV_FD_PASS, /* Passing pre-opened FDs for chardevs */
 
     QEMU_CAPS_LAST /* this must always be the last item */
 } virQEMUCapsFlags;
-- 
2.14.3