On Thu, 26 Nov 2020 at 21:36, Alexander Graf <ag...@csgraf.de> wrote: > The Apple M1 only supports up to 36 bits of physical address space. That > means we can not fit the 64bit MMIO BAR region into our address space. > > To fix this, let's not expose a 64bit MMIO BAR region when running on > Apple Silicon. > > I have not been able to find a way to enumerate that easily, so let's > just assume we always have that little PA space on hypervisor.framework > systems.
If you have direct access to the host ID_AA64MMFR0_EL1 you can look at the PARange field; otherwise start a stunt VM and look at its ID_AA64MMFR0_EL1.PARange (this is what we do for KVM to query various things about the VM's capabilities/ID regs). thanks -- PMM
