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 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.



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