From: Avi Kivity <avi@qumranet.com>
Date: Sun, 28 Oct 2007 16:52:05 +0000 (+0200)
Subject: KVM: MMU: Topup the mmu memory preallocation caches before emulating an insn
X-Git-Tag: v2.6.25-rc1~1138^2~182
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b733bfb524af69612f85c36a511f0109c5e3fe8d;p=linux-2.6

KVM: MMU: Topup the mmu memory preallocation caches before emulating an insn

Emulation may cause a shadow pte to be instantiated, which requires
memory resources.  Make sure the caches are filled to avoid an oops.

Signed-off-by: Avi Kivity <avi@qumranet.com>
---

diff --git a/drivers/kvm/mmu.c b/drivers/kvm/mmu.c
index ace3cb8621..9be54a5e85 100644
--- a/drivers/kvm/mmu.c
+++ b/drivers/kvm/mmu.c
@@ -1362,6 +1362,10 @@ int kvm_mmu_page_fault(struct kvm_vcpu *vcpu, gva_t cr2, u32 error_code)
 		goto out;
 	}
 
+	r = mmu_topup_memory_caches(vcpu);
+	if (r)
+		goto out;
+
 	er = emulate_instruction(vcpu, vcpu->run, cr2, error_code, 0);
 	mutex_unlock(&vcpu->kvm->lock);