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    SubjectRe: [PATCH 9/11] Panic delay fix
    On Thu, Feb 08, 2007 at 01:08:14AM -0800, Zachary Amsden wrote:
    > Andi Kleen wrote:
    > >On Wed, Feb 07, 2007 at 02:31:57PM -0800, Zachary Amsden wrote:
    > >
    > >>Dmitry Torokhov wrote:
    > >>
    > >>>I am confused - does i8042 talk to a virtual or real hardware here? In
    > >>>any case I think you need to fix kernel/panic.c to have proper
    > >>>(m)delay, not mess with i8042.
    > >>>
    > >>I think I need to fix both of them actually. This is virtual hardware,
    > >>but when you grab focus on a VM, the virtual hardware gets reflected to
    > >>the actual physical keyboard. Driving physical hardware that fast is bad.
    > >>
    > >
    > >???
    > >
    > >Surely the physical keyboard is always handled by the host kernel?
    > >I hope you're not saying it's trying to access the io ports directly?
    > >
    > No, not that. But the virtual keyboard I/O gets processed and converted
    > to physical keyboard I/O when a keyboard is attached to a VM. The

    You mean the commands to change the keyboard LEDs?

    > result is that the virtual keyboard spinning out of control causes the
    > physical keyboard to receive the same commands, far too rapidly.

    Hmm i would expect the host kernel keyboard driver to throttle these.
    I'm pretty sure the Linux one does the necessary mdelays at least.

    > So the keyboard blinks out of control and acts as if possessed by demons.

    Still sounds weird.

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      Last update: 2007-02-08 14:35    [W:0.037 / U:64.096 seconds]
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