On 20 December 2014 at 20:07, Arnd Bergmann <arnd@xxxxxxxx> wrote: > On Wednesday 17 December 2014 15:01:29 Marc Zyngier wrote: >> Also it is worth noticing that given how GICV is placed, it will never >> work with 64K pages and virtualization. Pretty sad. > > Does this mean no VGIC support on this platform so you have to emulate it > in order to run virtual machines with 64K pages, or does it mean that > it's impossible to use that way because you can't emulate it? Currently having the guest use the generic timer requires an in-kernel GIC, because we don't provide an ABI for having the kernel say "here is a generic timer interrupt for the userspace emulated GIC". And at least for QEMU userspace the "virt" board doesn't provide any other kind of timer, so you'd need to add one if you wanted to use a userspace GIC. So for practical purposes "out-of-kernel GIC" is not a supported config for KVM+QEMU. -- PMM -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
