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

[Anthony Liguori]

Alexander Graf 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.

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
> >     
>
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