KVM: MMU: disable global page optimization

upstream commit: bf47a760f66add7870fba33ab50f58b550d6bbd1

Complexity to fix it not worthwhile the gains, as discussed
in http://article.gmane.org/gmane.comp.emulators.kvm.devel/28649.

Cc: stable@kernel.org
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
[mtosatti: backport to 2.6.29]
Signed-off-by: Chris Wright <chrisw@sous-sol.org>

diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c
index 2d4477c7147372c28ed84f5a513ca553dc46979c..8005da20ad6bbc25501dec715c8dc41cf65d06ad 100644 (file)
--- a/arch/x86/kvm/mmu.c
+++ b/arch/x86/kvm/mmu.c
@@ -797,7 +797,7 @@ static struct kvm_mmu_page *kvm_mmu_alloc_page(struct kvm_vcpu *vcpu,
        ASSERT(is_empty_shadow_page(sp->spt));
        bitmap_zero(sp->slot_bitmap, KVM_MEMORY_SLOTS + KVM_PRIVATE_MEM_SLOTS);
        sp->multimapped = 0;
-       sp->global = 1;
+       sp->global = 0;
        sp->parent_pte = parent_pte;
        --vcpu->kvm->arch.n_free_mmu_pages;
        return sp;