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    Subject[patch 09/30] KVM: MMU: make __kvm_mmu_free_some_pages handle empty list

    2.6.30-stable review patch. If anyone has any objections, please let us know.

    ------------------
    From: Izik Eidus <ieidus@redhat.com>

    (cherry picked from commit 3b80fffe2b31fb716d3ebe729c54464ee7856723)

    First check if the list is empty before attempting to look at list
    entries.

    Signed-off-by: Izik Eidus <ieidus@redhat.com>
    Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
    Signed-off-by: Avi Kivity <avi@redhat.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
    ---
    arch/x86/kvm/mmu.c | 3 ++-
    1 file changed, 2 insertions(+), 1 deletion(-)

    --- a/arch/x86/kvm/mmu.c
    +++ b/arch/x86/kvm/mmu.c
    @@ -2612,7 +2612,8 @@ EXPORT_SYMBOL_GPL(kvm_mmu_unprotect_page

    void __kvm_mmu_free_some_pages(struct kvm_vcpu *vcpu)
    {
    - while (vcpu->kvm->arch.n_free_mmu_pages < KVM_REFILL_PAGES) {
    + while (vcpu->kvm->arch.n_free_mmu_pages < KVM_REFILL_PAGES &&
    + !list_empty(&vcpu->kvm->arch.active_mmu_pages)) {
    struct kvm_mmu_page *sp;

    sp = container_of(vcpu->kvm->arch.active_mmu_pages.prev,



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