[Xen-devel] Re: [PATCH 2 of 3] libxl: Add support for passing in the machine's E820 for PCI passthrough

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

On Tue, May 17, 2011 at 04:10:54PM +0100, Ian Jackson wrote:
> Sorry for the delay replying.  But:
> 
> Konrad Rzeszutek Wilk writes ("[PATCH 2 of 3] libxl: Add support for passing 
> in the machine's E820 for PCI passthrough"):
> > diff -r b6af9b428bb1 -r ba218fa1a48e tools/libxl/xl_cmdimpl.c
> ...
> > @@ -994,6 +995,8 @@ skip_vfb:
> >              if (!libxl_device_pci_parse_bdf(ctx, pcidev, buf))
> >                  d_config->num_pcidevs++;
> >          }
> > +        if (d_config->num_pcidevs && !c_info->hvm)
> > +          b_info->u.pv.machine_e820 = true;
> >      }
> 
> This doesn't seem to provide a way to force this behaviour on, which
> is (I assume) necessary if PCI devices are to be hotplugged later ?

Right. We never resolved that question. One idea was that if you had
'pci=[]' it would trigger this. But that just seemed wrong.


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