linux-kernel - [PATCH 3/9] KVM: Avoid oom on cr3 switch

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Message-Id: <20070105075245.49930250048@il.qumranet.com>
Date:	Fri, 05 Jan 2007 07:52:45 -0000
From:	Avi Kivity <avi@...ranet.com>
To:	kvm-devel@...ts.sourceforge.net
Cc:	linux-kernel@...r.kernel.org, akpm@...l.org, mingo@...e.hu
Subject: [PATCH 3/9] KVM: Avoid oom on cr3 switch

From: Ingo Molnar <mingo@...e.hu>

Signed-off-by: Ingo Molnar <mingo@...e.hu>
Signed-off-by: Avi Kivity <avi@...ranet.com>

Index: linux-2.6/drivers/kvm/mmu.c
===================================================================
--- linux-2.6.orig/drivers/kvm/mmu.c
+++ linux-2.6/drivers/kvm/mmu.c
@@ -905,6 +905,8 @@ static void paging_new_cr3(struct kvm_vc
 {
 	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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