From 7f7417d67ea6c1538469e3ea005484e807642c0a Mon Sep 17 00:00:00 2001
From: Ingo Molnar <mingo@elte.hu>
Date: Fri, 5 Jan 2007 16:36:57 -0800
Subject: [PATCH] KVM: Avoid oom on cr3 switch

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Avi Kivity <avi@qumranet.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---
 drivers/kvm/mmu.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/kvm/mmu.c b/drivers/kvm/mmu.c
index 6e7381bc221..4118e504e64 100644
--- a/drivers/kvm/mmu.c
+++ b/drivers/kvm/mmu.c
@@ -905,6 +905,8 @@ static void paging_new_cr3(struct kvm_vcpu *vcpu)
 {
 	pgprintk("%s: cr3 %lx\n", __FUNCTION__, vcpu->cr3);
 	mmu_free_roots(vcpu);
+	if (unlikely(vcpu->kvm->n_free_mmu_pages < KVM_MIN_FREE_MMU_PAGES))
+		kvm_mmu_free_some_pages(vcpu);
 	mmu_alloc_roots(vcpu);
 	kvm_mmu_flush_tlb(vcpu);
 	kvm_arch_ops->set_cr3(vcpu, vcpu->mmu.root_hpa);
-- 
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