Re: [Qemu-trivial] [Qemu-devel] [PATCH] pc: make user-triggerable exit conditional to DEBUG_BIOS define

[Hervé Poussineau]

Hi,

I've no idea what installer is trying to do with this port, or what 
device it is probing.

We can maybe add a runtime switch to exit Qemu or not. What do you think 
of '-vgabios-backdoor' which, if specified, does the exit ?

Otherwise, which solution do you propose?

Regards,

Hervé

Anthony Liguori a écrit :
> On 02/29/2012 04:44 PM, Hervé Poussineau wrote:
> > The port 0x501 is (at least) used by SCO Xenix 2.3.4 installer.
>
> For what?  What device would normally be there?
>
> I don't want to disable this by default.  My regression suite depends on 
> this as an exit mechanism.
>
> Regards,
>
> Anthony Liguori
>
> > Signed-off-by: Hervé Poussineau<address@hidden>
> > ---
> >   hw/pc.c |    3 +++
> >   1 files changed, 3 insertions(+), 0 deletions(-)
> >
> > diff --git a/hw/pc.c b/hw/pc.c
> > index 12c02f2..113a38a 100644
> > --- a/hw/pc.c
> > +++ b/hw/pc.c
> > @@ -565,7 +565,10 @@ static void bochs_bios_write(void *opaque, 
> > uint32_t addr, uint32_t val)
> >           /* LGPL'ed VGA BIOS messages */
> >       case 0x501:
> >       case 0x502:
> > +#ifdef DEBUG_BIOS
> >           exit((val<<  1) | 1);
> > +#endif
> > +        break;
> >       case 0x500:
> >       case 0x503:
> >   #ifdef DEBUG_BIOS