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

From: Benjamin Herrenschmidt
Subject: Re: [Qemu-devel] [qemu-devel][RFC] Enable usb with default options
Date: Wed, 06 Jun 2012 13:31:55 +1000

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.

-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).

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).

> Thanks. 
> 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. :)
>         Thanks. 
>          -Li
> -- 
> Best Regards
> -Li

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