From: Paolo Bonzini <pbonzini@redhat.com>
To: KVM list <kvm@vger.kernel.org>,
Cornelia Huck <cornelia.huck@de.ibm.com>,
Christian Borntraeger <borntraeger@de.ibm.com>,
qemu-devel <qemu-devel@nongnu.org>
Subject: [Qemu-devel] [s390] possible deadlock in handle_sigp?
Date: Mon, 12 Sep 2016 18:44:17 +0200 [thread overview]
Message-ID: <c9438426-1f1e-c6eb-9b90-79a6b62e537a@redhat.com> (raw)
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.
Thanks,
Paolo
next reply other threads:[~2016-09-12 16:45 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-09-12 16:44 Paolo Bonzini [this message]
2016-09-12 17:37 ` [Qemu-devel] [s390] possible deadlock in handle_sigp? Christian Borntraeger
2016-09-12 18:03 ` Paolo Bonzini
2016-09-13 13:06 ` Christian Borntraeger
2016-09-15 19:21 ` David Hildenbrand
2016-09-15 20:50 ` Paolo Bonzini
2016-09-19 8:15 ` Christian Borntraeger
2016-09-19 11:25 ` David Hildenbrand
2016-09-19 11:45 ` Christian Borntraeger
2016-09-20 11:57 ` [Qemu-devel] [PATCH] s390x/kvm: Fix potential deadlock in sigp handling Christian Borntraeger
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