KVM: x86: check for cr3 validity in ioctl_set_sregs

[pandora-kernel.git] / arch / x86 / kvm / x86.c

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index ffbb2c8..2bad49b 100644 (file)
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -3993,7 +3993,13 @@ int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu,
 
        vcpu->arch.cr2 = sregs->cr2;
        mmu_reset_needed |= vcpu->arch.cr3 != sregs->cr3;
-       vcpu->arch.cr3 = sregs->cr3;
+
+       down_read(&vcpu->kvm->slots_lock);
+       if (gfn_to_memslot(vcpu->kvm, sregs->cr3 >> PAGE_SHIFT))
+               vcpu->arch.cr3 = sregs->cr3;
+       else
+               set_bit(KVM_REQ_TRIPLE_FAULT, &vcpu->requests);
+       up_read(&vcpu->kvm->slots_lock);
 
        kvm_set_cr8(vcpu, sregs->cr8);