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

["Petersson, Mats" <Mats.Petersson@xxxxxxx>]

> -----Original Message-----
> From: Guy Zana [mailto:guy@xxxxxxxxxxxx] 
> Sent: 05 June 2007 14:34
> To: Petersson, Mats; Keir Fraser; xen-devel@xxxxxxxxxxxxxxxxxxx
> Subject: RE: [Xen-devel] 64Bits I/O Requests
> 
>  
> 
> > -----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?

Don't think so - it would be about 2500 changesets old, so almost every
bit of code that it touched originally wouldn't be where it was then, or
look the same (most of x86_emulate.c has changed since then, and we're
(at least) two upgrades of qemu-dm later now!). 

--
Mats
> 
> Thanks,
> Guy.
> 
> 
> 
> 



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