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Re: [Qemu-ppc] [PATCH RFC] target-ppc: tlbie should have global effect
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From: |
Benjamin Herrenschmidt |
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Subject: |
Re: [Qemu-ppc] [PATCH RFC] target-ppc: tlbie should have global effect |
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Date: |
Fri, 09 Sep 2016 15:49:55 +1000 |
On Fri, 2016-09-09 at 10:38 +0530, Nikunj A Dadhania wrote:
> One more question, when in gen_check_tlb_flush, don't I need to see
> if other CPU has global flag set ?
No, you leave it completely alone.
You can clear it's local flag as part of the flush (in the MT-TCG case
that can be done by the async handler) because if it had a "dirty" TLB
there is no point in it flushing it twice, but the global flag stays.
If the whole operation was completely synchronous, I suppose you could
clear the other's guy global flag, but it's not so I'd rather not take
chances for now.
Ben.