From: Marc Zyngier <marc.zyngier@arm.com>
To: Itaru Kitayama <itaru.kitayama@riken.jp>, kvmarm@lists.cs.columbia.edu
Subject: Re: [PATCH] updated: arm64: KVM: vgic: deal with GIC sub-page alignment
Date: Fri, 1 Jul 2016 09:40:42 +0100 [thread overview]
Message-ID: <57762C8A.8060105@arm.com> (raw)
In-Reply-To: <5775F854.3060306@riken.jp>
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...
next prev parent reply other threads:[~2016-07-01 8:35 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-07-01 4:57 [PATCH] updated: arm64: KVM: vgic: deal with GIC sub-page alignment Itaru Kitayama
2016-07-01 8:40 ` Marc Zyngier [this message]
2016-07-01 8:59 ` Itaru Kitayama
2016-07-01 9:20 ` Marc Zyngier
2016-07-09 0:27 ` Itaru Kitayama
2016-07-09 0:34 ` Itaru Kitayama
2016-07-09 10:08 ` Marc Zyngier
2016-07-09 10:32 ` Itaru Kitayama
2016-07-09 20:09 ` Marc Zyngier
2016-07-10 6:49 ` Itaru Kitayama
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