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path: root/drivers/kvm/kvm_main.c
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Diffstat (limited to 'drivers/kvm/kvm_main.c')
-rw-r--r--drivers/kvm/kvm_main.c14
1 files changed, 13 insertions, 1 deletions
diff --git a/drivers/kvm/kvm_main.c b/drivers/kvm/kvm_main.c
index 0675d3e51692..67c1154960f0 100644
--- a/drivers/kvm/kvm_main.c
+++ b/drivers/kvm/kvm_main.c
@@ -463,7 +463,19 @@ void set_cr3(struct kvm_vcpu *vcpu, unsigned long cr3)
463 463
464 vcpu->cr3 = cr3; 464 vcpu->cr3 = cr3;
465 spin_lock(&vcpu->kvm->lock); 465 spin_lock(&vcpu->kvm->lock);
466 vcpu->mmu.new_cr3(vcpu); 466 /*
467 * Does the new cr3 value map to physical memory? (Note, we
468 * catch an invalid cr3 even in real-mode, because it would
469 * cause trouble later on when we turn on paging anyway.)
470 *
471 * A real CPU would silently accept an invalid cr3 and would
472 * attempt to use it - with largely undefined (and often hard
473 * to debug) behavior on the guest side.
474 */
475 if (unlikely(!gfn_to_memslot(vcpu->kvm, cr3 >> PAGE_SHIFT)))
476 inject_gp(vcpu);
477 else
478 vcpu->mmu.new_cr3(vcpu);
467 spin_unlock(&vcpu->kvm->lock); 479 spin_unlock(&vcpu->kvm->lock);
468} 480}
469EXPORT_SYMBOL_GPL(set_cr3); 481EXPORT_SYMBOL_GPL(set_cr3);