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[PATCH v3] hw/mips: Improve the default USB settings in the loongson3-vi

From: Thomas Huth
Subject: [PATCH v3] hw/mips: Improve the default USB settings in the loongson3-virt machine
Date: Fri, 14 Jul 2023 12:49:03 +0200

It's possible to compile QEMU without the USB devices (e.g. when using
"--without-default-devices" as option for the "configure" script).
To be still able to run the loongson3-virt machine in default mode with
such a QEMU binary, we have to check here for the availability of the
OHCI controller first before instantiating the USB devices.

Signed-off-by: Thomas Huth <thuth@redhat.com>
 v3: Back to runtime detection, but more simple this time compared to v1
     (checking for OHCI should be enough, since this implies CONFIG_USB
      which is the switch that usb-kbd and usb-tablet are depending on)

 hw/mips/loongson3_virt.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/hw/mips/loongson3_virt.c b/hw/mips/loongson3_virt.c
index 4018b8c1d3..3ad0a223df 100644
--- a/hw/mips/loongson3_virt.c
+++ b/hw/mips/loongson3_virt.c
@@ -447,7 +447,7 @@ static inline void loongson3_virt_devices_init(MachineState 
-    if (defaults_enabled()) {
+    if (defaults_enabled() && object_class_by_name("pci-ohci")) {
         pci_create_simple(pci_bus, -1, "pci-ohci");
         usb_create_simple(usb_bus_find(-1), "usb-kbd");
         usb_create_simple(usb_bus_find(-1), "usb-tablet");

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