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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...

  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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