[PATCH 2/3] KVM: ARM: Get rid of KVM_HPAGE_ defines

[Peter Maydell]

On 25 August 2013 15:48, Gleb Natapov <gleb at redhat.com> wrote:
> On Sun, Aug 25, 2013 at 03:29:17PM +0100, Peter Maydell wrote:
>> Smiley noted, but this is pretty unlikely since it's not possible
>> to lie to the guest about which mode it's in, so you can't make
>> a guest think it's in Hyp mode.
>>
> I suspected this, but forgot most that I read about Hyp mode by now.
> Need to refresh my memory ASAP. Is it impossible even with a lot of
> emulation? Can guest detect that it is not in a Hyp mode without
> trapping into hypervisor?

Yes. The current mode is in the the low bits of the CPSR, which
is readable without causing a trap. This is just the most obvious
roadblock; I bet there are more. If you really had to run Hyp mode
code in a VM you probably have to do it by having it all emulated
via TCG.

-- PMM