Re: [Xen-devel] Access to raw keycodes in xen domU

[Keir Fraser <keir.fraser@xxxxxxxxxxxxx>]

Keyboard is owned by dom0. There's not really an easy way to propagate the
raw keycodes to a pv domU. For an hvm domU we reverse-map to the raw
keycodes in qemu-dm and send those via the emulated pckeyboard.

 -- Keir

On 14/8/08 14:58, "Maxim Gorbachyov" <maxim.gorbachyov@xxxxxxxxx> wrote:

> Hi.
> 
> 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;
>         long val;
> 
>         switch (cmd) {
>         case KDGKBTYPE:
>                 ucval = KB_101;
>                 return put_user(ucval, (char __user *)arg);
> 
>         case KDGKBMODE:
>                 val = K_UNICODE;
>                 return put_user(val, (long __user *)arg);
> 
>         case KDSKBMODE:
>                 return 0;
>         }
>         return -ENOIOCTLCMD;
> }
> 
> It's enough to make showkey run, but it does not report correct
> keycodes. I think I have to do something like
> 
> HYPERVISOR_console_io(CONSOLEIO_ioctl, ... )
> 
> but there is no CONSOLEIO_ioctl.
> 
> Could you please suggest what can I do to access raw keycodes?
> 
> _______________________________________________
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> Xen-devel@xxxxxxxxxxxxxxxxxxx
> http://lists.xensource.com/xen-devel



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