[PATCH] arm64: dts: Fix GIC reg sizes for APM X-Gene

[Peter Maydell]

On 22 February 2015 at 06:56, Rob Herring <robherring2 at gmail.com> wrote:
> On Thu, Feb 19, 2015 at 1:03 PM, Christoffer Dall
> <christoffer.dall at linaro.org> wrote:
>> It matters if you want to ensure that the 64K page you are assigning to
>> a guest for the GIC virtual CPU interface contains only GIC virtual CPU
>> mappings, and not other random stuff that the guest is not allowed to
>> touch.
>
> Good point.
>
>> How else should this be enforced?
>
> Rely on correct h/w design? You'll have to repeat this every time you
> want to do pass-thru of a device.

The idea is that the device tree lets us describe whether
the hardware design is correct or not :-)

> What do you do if 64K mapping is not supported? Fallback to emulation
> of the CPU interface?

In this case KVM can't be supported -- use 4K host pages with this
hardware, or don't use KVM...

-- PMM