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Re: [Qemu-devel] [qemu-devel][RFC] Enable usb with default options

From: li zhang
Subject: Re: [Qemu-devel] [qemu-devel][RFC] Enable usb with default options
Date: Wed, 6 Jun 2012 14:03:35 +0800

On Wed, Jun 6, 2012 at 1:42 PM, Anthony Liguori <address@hidden> wrote:
On 06/06/2012 11:31 AM, Benjamin Herrenschmidt wrote:
On Wed, 2012-06-06 at 10:52 +0800, li zhang wrote:
Hi Anthony,

Any comment on this?

Allright, this is all quite confusing...

He's what I think should happen:

When no option is passed -at-all-, we should have vga std and usb ohci +
usb mouse + usb ps2.

When -nodefault is passed, we should have none of the above.

-nodefault is a pretty ugly hack.  I don't think there's any good reason to involve -nodefault into this discussion.

-vga should only affect vga (a shortcut for -device


-usb should be essentially useless by default unless -nodefault is
passed in which case it is necessary to enable usb support, and -device
(or equivalent) to manually add the keyboard and mouse (libvirt).

If you want pseries to always have usb, just make it there by default and yeah, -usb would be useless.  If you want the option to not have usb, introduce a machine option I guess.

Thanks Anthony. 
It's a better way to introduce one machine option.  :)

I think it's over thinking it though.  There's little harm in having a usb controller present all the time.

 Got it. 


Anthony Liguori

That's the best I can think of ... however it might be a bit tricky
seeing how qemu does things in vl.c at the moment, we might want to
introduce a default_usb variable which is used to set usb_enabled.

BTW. The mac models should essentially behave the same, at least the
64-bit one (32-bit supports CUDA for keyboard/mouse so USB isn't
strictly necessary).



On Tue, Jun 5, 2012 at 5:48 PM, li zhang<address@hidden>  wrote:
        Hi all,

        For pseries, when creating VMs with "-vga std",
        it requires usb mouse and usb kbd devices to be added.

        But with default options, vga is enabled and usb is disabled.
        User may use default options as the following commands:

        $qemu -M pseries

        If vga is enabled, usb mouse and usb kbd is disabled,
        the mouse and kbd can't be used. So it's very hard for
        users to use.

        I think it's necessary to enable usb with default options.

        Any idea about that?
        Your comments  are very appreciated. :)



Best Regards


Best Regards

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