On 24 June 2014 20:28, Joel Schopp <joel.schopp@xxxxxxx> wrote: > > On 06/19/2014 04:21 AM, Marc Zyngier wrote: >> >> The GIC CPU interface is always 4k aligned. If the host is using >> 64k pages, it is critical to place the guest's GICC interface at the >> same relative alignment as the host's GICV. Failure to do so results >> in an impossibility for the guest to deal with interrupts. >> >> Add a KVM_DEV_ARM_VGIC_GRP_ADDR_OFFSET attribute for the VGIC, allowing >> userspace to retrieve the GICV offset in a page. It becomes then trivial >> to adjust the GICC base address for the guest. > > > Does this mean there is a corresponding patch for qemu? Not as far as I know. It's a bit awkward on the QEMU end because we really want to provide the guest a consistent memory map regardless of the host CPU. So at best we'd probably use it to say "sorry, can't run on this CPU/host kernel". (That said, if you think you can make QEMU usefully use the information and want to write a QEMU patch I'm not averse to the idea.) kvmtool is probably better placed to take advantage of it since it takes more of a "deal with what the host provides you" philosophy. thanks -- PMM -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
