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Re: [Qemu-devel] [PATCH v2 9/9] target-arm: Add WFx instruction trap sup


From: Peter Maydell
Subject: Re: [Qemu-devel] [PATCH v2 9/9] target-arm: Add WFx instruction trap support
Date: Thu, 23 Apr 2015 16:11:01 +0100

On 23 April 2015 at 16:00, Greg Bellows <address@hidden> wrote:
>
>
> On Thu, Apr 23, 2015 at 9:51 AM, Peter Maydell <address@hidden>
> wrote:
>> We should check what the architecture manual says, but I think
>> that in all the trap-WFE cases it says "traps if the CPU
>> would go into a low power state". QEMU *never* goes into a
>> low power state on WFE, so we never trap.
>
>
> Right, that is exactly what it says.  So if QEMU never goes into a low power
> state than neither wfi or wfe should trap as they have the same explanation.
> In which case the best solution is to pull the patches out.  That work?

No, because for WFI we *do* go into a low-power state (EXCP_HLT),
so we must trap.

-- PMM



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