runqemu: add an option to enable guest-agent virtio device

Add support to the runqemu script for a new option, 'guestagent', that
enables the virtio serial port for host-to-guest communication.

(From OE-Core rev: 21a1e52079089c5bbeee8ffc9c504471f4a8732a)

Signed-off-by: Brenda Streiff <brenda.streiff@ni.com>
Signed-off-by: Clément Péron <peron.clem@gmail.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 14 insertions, 0 deletions

diff --git a/scripts/runqemu b/scripts/runqemu
index 58b0c191e1..38aa35fdd4 100755
--- a/scripts/runqemu
+++ b/scripts/runqemu
@@ -82,6 +82,7 @@ of the following environment variables (in any order):
     kvm-vhost - enable KVM with vhost when running x86/x86_64 (VT-capable CPU required)
     publicvnc - enable a VNC server open to all hosts
     audio - enable audio
+    guestagent - enable guest agent communication
     [*/]ovmf* - OVMF firmware file or base name for booting with UEFI
   tcpserial=<port> - specify tcp serial port number
   qemuparams=<xyz> - specify custom parameters to QEMU
@@ -216,6 +217,8 @@ class BaseConfig(object):
         self.cleaned = False
         # Files to cleanup after run
         self.cleanup_files = []
+        self.guest_agent = False
+        self.guest_agent_sockpath = '/tmp/qga.sock'
 
     def acquire_taplock(self, error=True):
         logger.debug("Acquiring lockfile %s..." % self.taplock)
@@ -526,6 +529,10 @@ class BaseConfig(object):
             elif arg == 'publicvnc':
                 self.publicvnc = True
                 self.qemu_opt_script += ' -vnc :0'
+            elif arg == 'guestagent':
+                self.guest_agent = True
+            elif arg.startswith('guestagent-sockpath='):
+                self.guest_agent_sockpath = '%s' % arg[len('guestagent-sockpath='):]
             elif arg.startswith('tcpserial='):
                 self.tcpserial_portnum = '%s' % arg[len('tcpserial='):]
             elif arg.startswith('qemuparams='):
@@ -1375,6 +1382,12 @@ class BaseConfig(object):
         except FileNotFoundError:
             raise RunQemuError("/dev/dri directory does not exist; no render nodes available on this machine. %s" %(render_hint))
 
+    def setup_guest_agent(self):
+        if self.guest_agent == True:
+            self.qemu_opt += ' -chardev socket,path=' + self.guest_agent_sockpath + ',server,nowait,id=qga0 '
+            self.qemu_opt += ' -device virtio-serial '
+            self.qemu_opt += ' -device virtserialport,chardev=qga0,name=org.qemu.guest_agent.0 '
+
     def setup_vga(self):
         if self.nographic == True:
             if self.sdl == True:
@@ -1506,6 +1519,7 @@ class BaseConfig(object):
         if self.snapshot:
             self.qemu_opt += " -snapshot"
 
+        self.setup_guest_agent()
         self.setup_serial()
         self.setup_vga()