On 01/07/16 09:59, Itaru Kitayama wrote: > Marc, > That's good news. Can I assume you'd keep the > KVM_DEV_ARM_VGIC_GRP_ADDR_OFFSET attribute, or would you introduce new > ones? I ask because either way we need the userland support, be it QEMU > or kvmtool. I'm carrying the small QEMU patch at this moment. You can look at the kvm-arm64/gicv-align branch in my tree, which contains some of the stuff. At the moment, the attribute is named KVM_DEV_ARM_VGIC_GRP_GICC_OFFSET, but I don't mind changing the name. Thanks, M. > > > On 7/1/16 5:40 PM, Marc Zyngier wrote: >> Itaru, >> >> On 01/07/16 05:57, Itaru Kitayama wrote: >>> This is merely an update to the patch Marc posted in 2014: >>> >>> https://lists.cs.columbia.edu/pipermail/kvmarm/2014-June/010055.html >>> >>> This updated patch is against today's current kvmarm git tree tag, >>> kvm-for-arm-v4.7-rc6. >>> >>> 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. >>> >>> Signed-off-by: Marc Zyngier <marc.zyngier@xxxxxxx <https://lists.cs.columbia.edu/mailman/listinfo/kvmarm>> >>> Signed-off-by: Itaru Kitayama <itaru.kitayama@xxxxxxxx> >> >> I'm working on a much more complete patch series that deals with this >> and a bit more. Hopefully for the 4.9 time frame. >> >> Thanks, >> >> M. >> > -- Jazz is not dead. It just smells funny... _______________________________________________ kvmarm mailing list kvmarm@xxxxxxxxxxxxxxxxxxxxx https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
