From mboxrd@z Thu Jan  1 00:00:00 1970
From: Marc Zyngier <marc.zyngier@arm.com>
Subject: Re: [PATCH] updated: arm64: KVM: vgic: deal with GIC sub-page
 alignment
Date: Fri, 1 Jul 2016 09:40:42 +0100
Message-ID: <57762C8A.8060105@arm.com>
References: <5775F854.3060306@riken.jp>
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To: Itaru Kitayama <itaru.kitayama@riken.jp>, kvmarm@lists.cs.columbia.edu
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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@arm.com <https://lists.cs.columbia.edu/mailman/listinfo/kvmarm>>
> Signed-off-by: Itaru Kitayama <itaru.kitayama@riken.jp>

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...