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From: | Christian Borntraeger |
Subject: | Re: [Qemu-devel] [s390] possible deadlock in handle_sigp? |
Date: | Mon, 12 Sep 2016 19:37:42 +0200 |
User-agent: | Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.3.0 |
On 09/12/2016 06:44 PM, Paolo Bonzini wrote: > I think that two CPUs doing reciprocal SIGPs could in principle end up > waiting on each other to complete their run_on_cpu. If the SIGP has to > be synchronous the fix is not trivial (you'd have to put the CPU in a > state similar to cpu->halted = 1), otherwise it's enough to replace > run_on_cpu with async_run_on_cpu. IIRC the sigps are supossed to be serialized by the big QEMU lock. WIll have a look.
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