[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] [PATCH] xen/arm: Implement domain_get_maximum_gpfn
On Wed, 2014-07-02 at 12:51 +0200, Roger Pau Monnà wrote: > On 02/07/14 12:31, Jan Beulich wrote: > >>>> On 02.07.14 at 12:19, <roger.pau@xxxxxxxxxx> wrote: > >> For PVH guests there's still no MMIO hole (or any other kind of hole) at > >> all, the hole(s) is only there for Dom0. > > > > So where would passed through devices get their MMIO BARs located? > > (I realize pass-through isn't supported yet for PVH, but I didn't expect > > such fundamental things to be missing.) > > We could always add a MMIO region to a PVH guest in backwards compatible > way, the only requirement is to make sure the e820 provided to the guest > has this hole set up, but I see no reason to add it before having this > functionality, or to add it unconditionally to guests even if no devices > are passed through. > > Also, shouldn't PVH guests use pcifront/pciback, which means it won't > have any BARs mapped directly? They need to map them somewhere in their physical address to be able to use them... (Unlike a PV guest which I think maps them in the virtual address space "by magic" avoiding the need for a p2m entry). Ian. _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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