Re: AW: Re: [Qemu-devel] VMport patch

[Anthony Liguori]

Mark Williamson wrote:
> > > I think it would be great to maintain compatibility with the binary-only
> > > versions of the vm tools though.
> > >       
> > But you're changing the semantics of the x86 instruction set.  You
> > potentially break a real operating system.  It also eliminates the
> > possibility of nesting with something like kqemu because you can't trap
> > all PIO operations.
> >     
>
> Maybe have a commandline flag, and have it switched off by default?  Or, even 
> better, would be to detect valid vmware tools behaviour and switch it on iff 
> that happened; the default being to behave normally for OSes that aren't 
> running the VMware tools..
>   

There is no way to know for sure that it's vm-tools running.  You would 
have to make use of the cpu option to support it I reckon.

Regards,

Anthony Liguori

> Cheers,
> Mark
>
>   
> > Regards,
> >
> > Anthony Liguori
> >
> >     
> > > Regards,
> > >
> > > Alex
> > >
> > > ----- Ursprüngliche Nachricht -----
> > > Von: Anthony Liguori <address@hidden>
> > > Gesendet: Sonntag, 20. Januar 2008 22:40
> > > An: address@hidden
> > > Betreff: Re: [Qemu-devel] VMport patch
> > >
> > > Filip Navara wrote:
> > >       
> > > > Hello,
> > > >
> > > > the current version of QEMU emulates the VMware backdoor I/O port and
> > > > it works quite well. Unfortunately it doesn't emulate the VMware
> > > > behavior of ignoring the I/O permissions when accessing this special
> > > > port. The attached patch corrects it. It's important to ignore the
> > > > permissions, so that user mode VMware tools can communicate to the
> > > > backdoor. =
> > > >         
> > > I really dislike that VMware relies on this.  It's very hard to
> > > implement in kqemu or KVM.  I think it would be better to modify
> > > open-vm-tools than to modify QEMU.
> > >
> > > Regards,
> > >
> > > Anthony Liguori
> > >
> > >       
> > > > Best regards,
> > > > Filip Navara
> > > >         
>
>
>
>