[Xen-users] Access to raw keycodes in xen domU

["Maxim Gorbachyov" <maxim.gorbachyov@xxxxxxxxx>]

Hello.
There is a need to have access to raw keycodes in xen domU (like
showkey (1)). Using xen-hypervisor-3.2 and linux-2.6.18-xen-3.2.0 with
these parameters:

kernel = "/my/vmlinuz"
memory = 128
name = "dn1"
vif = [ '' ]
disk = [ 'tap:aio:/my/img,hda1,w' ]
root = "/dev/hda1 ro"
extra = "2 xencons=tty"

I run "# strace showkey" inside domU and get this:
...
open("/dev/tty", O_RDWR)                = 3
ioctl(3, KDGKBTYPE, 0x7fff91e9da17)     = -1 EINVAL (Invalid argument)
...

Indeed there is no ioctl() implementation assigned to
xencons_ops.ioctl in
linux-2.6.18-xen-3.2.0/drivers/xen/console/console.c
I've tried assigning xencons_ops.ioctl to something like that:

static int xencons_ioctl(struct tty_struct *tty, struct file * file,
        unsigned int cmd, unsigned long arg)
{
        unsigned char ucval;
        struct kbd_struct * kbd;
        unsigned int console;
        struct vc_data * vc;
        long val;

        vc = (struct vc_data *)tty->driver_data;
        console = vc->vc_num;
        kbd = kbd_table + console;

        switch (cmd) {
        case KDGKBTYPE:
                ucval = KB_101;
                return put_user(ucval, (char __user *)arg);

        case KDGKBMODE:
                val = ((kbd->kbdmode == VC_RAW) ? K_RAW :
                        (kbd->kbdmode == VC_MEDIUMRAW) ? K_MEDIUMRAW :
                        (kbd->kbdmode == VC_UNICODE) ? K_UNICODE :
                        K_XLATE);
                return put_user(val, (long __user *)arg);
        }
        return -ENOIOCTLCMD;
}
, but I get tty->driver_data set to NULL. It seems like I have to get
some data from hypervisor / dom0, but it's not clear for me now how to
do it.

Could you please suggest how to get that access?

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