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Re: [PATCH 4/8] arm: Synchronize CPU on PSCI on

From: Peter Maydell
Subject: Re: [PATCH 4/8] arm: Synchronize CPU on PSCI on
Date: Thu, 26 Nov 2020 22:26:34 +0000

On Thu, 26 Nov 2020 at 22:16, Alexander Graf <agraf@csgraf.de> wrote:
> cpu_synchronize_state() sets the CPU registers into "dirty" state which
> means that env now holds the current copy. On the next entry, we then
> sync them back into HVF.
> Without the cpu_synchronize_state() call, HVF never knows that the CPU
> state is actually dirty. I guess it could as well live in cpu_reset()
> somewhere, but we have to get the state switched over to dirty one way
> or another.
> One interesting thing to note here is that the CPU actually comes up in
> "dirty" after init. But init is done on realization already. I'm not
> sure why we lose the dirty state in between that and the reset.

Yeah, it sounds like you need to figure out where the dirty
to not-dirty transitions ought to be happening rather than
just fudging things here...

-- PMM

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