On 27/05/2025 8:56 pm, Edgar E. Iglesias wrote: > From: "Edgar E. Iglesias" <edgar.igles...@amd.com> > > This follows up on the virtio-pci discussion and adds a per-domain > option to select the behaviour of accesses to unmapped mmio ranges. > The new option is trap-unmapped-mmio. For dom0less I negated it to > be able to use a boolean prop and keep existing behaviour, i.e > trap-unmapped-mmio-disabled. > > I'm happy with any name though so if you have better ideas please > suggest them! > > For the domain config i followed the example of x86 flags > and XEN_X86_MSR_RELXED, creating a flags field for ARM. > > Thanks, > Edgar
I think this should be common, rather than ARM specific. Traditionally on x86, access to unimplemented address space was ignored (write discard, read ~0), but these days you do get a machine check on certain ranges, which is for all intents and purposes the same as a data abort. So even if x86 requires it to be false in the short term, I think the control ought to be common, so x86 and others can opt in at a later point. I don't have a good suggestion for the name, but it's not really about MMIO space; it's about address space generally. ~Andrew
