Paul Mackerras a355aa54f1 KVM: Add barriers to allow mmu_notifier_retry to be used locklessly ... This adds an smp_wmb in kvm_mmu_notifier_invalidate_range_end() and an smp_rmb in mmu_notifier_retry() so that mmu_notifier_retry() will give the correct answer when called without kvm->mmu_lock being held. PowerPC Book3S HV KVM wants to use a bitlock per guest page rather than a single global spinlock in order to improve the scalability of updates to the guest MMU hashed page table, and so needs this. Signed-off-by: Paul Mackerras <paulus@samba.org> Acked-by: Avi Kivity <avi@redhat.com> Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: Avi Kivity <avi@redhat.com>		2012-03-05 14:52:38 +02:00
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kvm	KVM: Add barriers to allow mmu_notifier_retry to be used locklessly	2012-03-05 14:52:38 +02:00