Re: [Xen-devel] PCI Passthrough ARM Design : Draft1

[Julien Grall <julien.grall@xxxxxxxxxx>]

On 16/06/2015 08:02, Roger Pau Monné wrote:
> Hello,
>
> El 16/06/15 a les 7.42, Manish Jaggi ha escrit:
> [...]
> > > > > Beware that the 1:1 mapping doesn't fit with the current guest memory
> > > > > layout which is pre-defined at Xen build time. So you would also have
> > > > > to make it dynamically or decide to use the same memory layout as the
> > > > > host.
> > > > If same layout as host used, would there be any issue?
> > > I'm not sure that a 1:1 mapping is any different to the host layout. But
> > > in any case, the host layout also doesn't match the guest layout, so it
> > > has the same issues.
> > There is a domctl on x86 DOMCTL_iomem_permission which looks doing the
> > same thing as the map_mmio hypercall which I am proposing. I am not sure
> > if it does a 1:1. Do you have more info on it?
> No, this hypercall only sets the permissions of IO memory ranges, but
> AFAICT it doesn't touch the p2m at all.
Correct.


--
Julien Grall

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