Re: [Xen-devel] [Qemu-devel] [PATCH v1] xenpt: Properly handle 64-bit bar with more than 4G size

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

On Wed, Aug 12, 2015 at 08:53:44AM +0000, Wu, Feng wrote:
> 
> 
> > -----Original Message-----
> > From: Jan Beulich [mailto:JBeulich@xxxxxxxx]
> > Sent: Wednesday, August 12, 2015 4:43 PM
> > To: Wu, Feng
> > Cc: stefano.stabellini@xxxxxxxxxxxxx; xen-devel@xxxxxxxxxxxxxxxxxxx;
> > qemu-devel@xxxxxxxxxx
> > Subject: RE: [Qemu-devel] [Xen-devel] [PATCH v1] xenpt: Properly handle 
> > 64-bit
> > bar with more than 4G size
> > 
> > >>> On 12.08.15 at 09:10, <feng.wu@xxxxxxxxx> wrote:
> > 
> > >
> > >> -----Original Message-----
> > >> From: qemu-devel-bounces+feng.wu=intel.com@xxxxxxxxxx
> > >> [mailto:qemu-devel-bounces+feng.wu=intel.com@xxxxxxxxxx] On Behalf Of
> > >> Jan Beulich
> > >> Sent: Wednesday, August 12, 2015 2:59 PM
> > >> To: Wu, Feng
> > >> Cc: xen-devel@xxxxxxxxxxxxxxxxxxx; qemu-devel@xxxxxxxxxx;
> > >> stefano.stabellini@xxxxxxxxxxxxx
> > >> Subject: Re: [Qemu-devel] [Xen-devel] [PATCH v1] xenpt: Properly handle
> > 64-bit
> > >> bar with more than 4G size
> > >>
> > >> >>> On 05.08.15 at 04:02, <feng.wu@xxxxxxxxx> wrote:
> > >> > @@ -491,8 +474,9 @@ static int
> > >> xen_pt_bar_reg_write(XenPCIPassthroughState *s, XenPTReg *cfg_entry,
> > >> >          bar_ro_mask = XEN_PT_BAR_IO_RO_MASK | (r_size - 1);
> > >> >          break;
> > >> >      case XEN_PT_BAR_FLAG_UPPER:
> > >> > +        r = &d->io_regions[index-1];
> > >>
> > >> Perhaps worth an assert(index > 0)?
> > >
> > > No problem, I will add it. BTW, do you have any other comments about this
> > > patch? If no, I am
> > > going to send out the new version with this changes.
> > 
> > No - everything else looks to make sense (but continues to need
> > testing).
> > 
> 
> I don't have such a device in hand. Can anybody who has such a device help to 
> test this
> patch? It would be highly appreciated!

Um, 4GB MMIO bars? Wouldn't the Nvidia Quadro K6000 12GB GDDR do it? I am sure
that Intel would be OK expensing $4K of hardware :-)

> 
> Thanks,
> Feng
> 
> > Jan
> 
> 
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