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List:       qemu-s390x
Subject:    Re: [PATCH] s390x: sigp: Fix sense running reporting
From:       David Hildenbrand <david () redhat ! com>
Date:       2020-01-24 13:15:26
Message-ID: e815e3ef-3580-6eef-b198-cb11fdf57e1c () redhat ! com
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> No idea.
> How many people use smp with tcg?
> 

The kernel uses it (pcpu_running()) to decide whether
- To send an emergency call or an external call (external calls are
  faster when the CPU is already running - e.g., SIE HW assist)
- In arch_vcpu_is_preempted(), for an heuristic

So nothing actually breaks (as I explained, only used for performance
optimizations)

-- 
Thanks,

David / dhildenb



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