package/qemu: add option to enable virtual filesystem in host qemu

Signed-off-by: Etienne Carriere <etienne.carriere@linaro.org>
[Thomas: tweak option prompt]
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/qemu/Config.in.host

@@ -67,4 +67,10 @@ config BR2_PACKAGE_HOST_QEMU_VDE2
 	  Ethernet and can be used to create virtual switches to
 	  "plug" both physical and virtual machines in them.
 
+config BR2_PACKAGE_HOST_QEMU_VIRTFS
+	bool "Virtual filesystem support"
+	help
+	  Enables support for virtual filesystem in Qemu allowing
+	  shared filesystem between Qemu and its emulated target.
+
 endif

package/qemu/qemu.mk

@@ -253,6 +253,10 @@ HOST_QEMU_OPTS += --enable-vde
 HOST_QEMU_DEPENDENCIES += host-vde2
 endif
 
+ifdef ($(BR2_PACKAGE_HOST_QEMU_VIRTFS),y)
+HOST_QEMU_OPTS += --enable-virtfs
+endif
+
 # Override CPP, as it expects to be able to call it like it'd
 # call the compiler.
 define HOST_QEMU_CONFIGURE_CMDS