RE: [Xen-devel] 64Bits I/O Requests

["Guy Zana" <guy@xxxxxxxxxxxx>]

> -----Original Message-----
> From: Petersson, Mats [mailto:Mats.Petersson@xxxxxxx] 
> Sent: Tuesday, June 05, 2007 4:27 PM
> To: Guy Zana; Keir Fraser; xen-devel@xxxxxxxxxxxxxxxxxxx
> Subject: RE: [Xen-devel] 64Bits I/O Requests
> 
> > 
> > Hi,
> >  
> > Is there a plan to support 64bit io-requests ?
> > For instance, movq (mmx) will fail today.
> 
> About a year ago, I was working on this, but some other 
> project got in the way, so it never got into Xen. It's not 
> HARD as such, but it requires some pretty big modifications 
> to the way that qemu-dm and instruction emulation is done 
> (preferrably using the code in x86_emulate.c). 
> 

Yes, it requires a lot of modifications in the qemu interface,
I thought about splitting each 64bit write memory access into two 32bit ones 
but it will be complicated to perform _reads_ like that.

Do you have something useable to send?

Thanks,
Guy.


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