[PATCH 6/7] selftests/kho: LoongArch: disable PS/2 input devices for QEMU virt

[George Guo]

From: George Guo <guodongtai at kylinos.cn>

QEMU's LoongArch virt machine has no i8042 PS/2 controller.  When PNP
detection finds nothing, i8042_init() falls back to probing the ports
directly.  On LoongArch the I/O ports are memory-mapped, and the i8042
port addresses are not backed by any device on the virt machine, so
i8042_flush() takes a page fault and the kernel panics:

  i8042: PNP: No PS/2 controller found.
  i8042: Probing ports directly.
  CPU 0 Unable to handle kernel paging request at virtual address ffff800000008064
  ERA: i8042_flush+0x50/0x198
   RA: i8042_init+0x2a8/0x35c
  Kernel panic - not syncing: Attempted to kill init!

Disable SERIO_I8042 and its dependents (KEYBOARD_ATKBD, MOUSE_PS2) in
the QEMU_KCONFIG fragment to prevent the driver from being built.

Signed-off-by: George Guo <guodongtai at kylinos.cn>
---
 tools/testing/selftests/kho/loongarch.conf | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/tools/testing/selftests/kho/loongarch.conf b/tools/testing/selftests/kho/loongarch.conf
index b0551e0c2d77..0145cb49e5b2 100644
--- a/tools/testing/selftests/kho/loongarch.conf
+++ b/tools/testing/selftests/kho/loongarch.conf
@@ -2,6 +2,9 @@ QEMU_CMD="qemu-system-loongarch64 -M virt -cpu la464"
 QEMU_KCONFIG="
 CONFIG_SERIAL_8250=y
 CONFIG_SERIAL_8250_CONSOLE=y
+# CONFIG_KEYBOARD_ATKBD is not set
+# CONFIG_MOUSE_PS2 is not set
+# CONFIG_SERIO_I8042 is not set
 "
 KERNEL_IMAGE="vmlinux.efi"
 KERNEL_CMDLINE="console=ttyS0 earlycon"
-- 
2.25.1