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H A D | kvm-s390.c | diff 83987ace22f541964bd0dbf83a3f6b0014ba3e1e Tue Jan 08 16:23:10 CET 2013 Christian Borntraeger <borntraeger@de.ibm.com> s390/kvm: Fix BUG in include/linux/kvm_host.h:745
commit b080935c8638e08134629d0a9ebdf35669bec14d kvm: Directly account vtime to system on guest switch
also removed the irq_disable/enable around kvm guest switch, which is correct in itself. Unfortunately, there is a BUG ON that (correctly) checks for preemptible to cover the call to rcu later on. (Introduced with commit 8fa2206821953a50a3a02ea33fcfb3ced2fd9997 KVM: make guest mode entry to be rcu quiescent state)
This check might trigger depending on the kernel config. Lets make sure that no preemption happens during kvm_guest_enter. We can enable preemption again after the call to rcu_virt_note_context_switch returns.
Please note that we continue to run s390 guests with interrupts enabled.
Acked-by: Frederic Weisbecker <fweisbec@gmail.com> CC: Gleb Natapov <gleb@redhat.com> Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
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