On Tue, Jan 08, 2013 at 04:23:10PM +0100, Christian Borntraeger wrote: > 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. > > CC: Frederic Weisbecker <[email protected]> > CC: Gleb Natapov <[email protected]> > Signed-off-by: Christian Borntraeger <[email protected]>
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