Re: [Qemu-devel] [PATCH v6 11/19] cputlb: introduce tlb_flush_* async work.

[Richard Henderson]

On 11/10/2016 06:34 PM, Alex Bennée wrote:
> So to properly support ARM TLB flush semantics I want to move some of
> the looping in the helpers into cputlb.c so I'm thinking we'll have:
>
> tlb_flush_page_all_cpus
> tlb_flush_by_mmuidx_all_cpus
> tlb_flush_page_by_mmuidx_all_cpus

Sounds good, thanks.

> In fact for ARM we'll be able to put off the reckoning until a DMB
> instruction comes along and we can force synchronisation at that point
> but I'm assuming there must be other architectures with stricter
> requirements.

Yes, I can think of at least one arch for which the cross-cpu flush must finish 
before the source cpu continues.


r~