Re: [Xen-devel] [PATCH for-4.6] xen/arm: vgic-v2: Map the GIC virtual CPU interface with the correct size

[Ian Campbell <ian.campbell@xxxxxxxxxx>]

On Fri, 2015-09-18 at 09:53 +0100, Ian Campbell wrote:
> On Thu, 2015-09-17 at 19:00 +0100, Julien Grall wrote:
> > On GICv2, the GIC virtual CPU interface is at minimum 8KB. Due some to
> > some necessary quirk for GIC using 64KB stride, we are mapping the
> > region in 2 time.
> > The first mapping is 4KB and the second one is 8KB, i.e 12KB in total.
> > Although the minimum supported size (and widely used) is 8KB. This
> > means
> > that we are mapping 4KB more to any guest using GICv2.
> > 
> > While this looks scary at first glance, the GIC virtual CPU interface
> > is
> > most frequently at the end the GIC I/O region. So we will most likely
> > map an an unused I/O region or a mirrored version of GICV for platform
> > using 64KB stride.
> > 
> > Nonetheless, fix the second mapping to only map 4KB.
> > 
> > Signed-off-by: Julien Grall <julien.grall@xxxxxxxxxx>
> 
> Acked-by: Ian Campbell <ian.campbell@xxxxxxxxxx>
> 
> > ---
> > 
> > This is a candidate for Xen 4.6 and backport to Xen 4.5.
> 
> I concur and with Wei not being around I shall plan to apply later today
> unless there are objections.

I got distracted. Now applied to staging and staging-4.6 now and noted for
later application to 4.5

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