KVM: MMU: ignore zapped root pagetables

Mark zapped root pagetables as invalid and ignore such pages during lookup.

This is a problem with the cr3-target feature, where a zapped root table fools
the faulting code into creating a read-only mapping. The result is a lockup
if the instruction can't be emulated.

Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Cc: Anthony Liguori <aliguori@us.ibm.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>

1 files changed, 23 insertions, 0 deletions

diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index cf6df5167af6..c41eb57ce29b 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -119,6 +119,29 @@ void kvm_flush_remote_tlbs(struct kvm *kvm)
         smp_call_function_mask(cpus, ack_flush, NULL, 1);
 }
 
+void kvm_reload_remote_mmus(struct kvm *kvm)
+{
+        int i, cpu;
+        cpumask_t cpus;
+        struct kvm_vcpu *vcpu;
+
+        cpus_clear(cpus);
+        for (i = 0; i < KVM_MAX_VCPUS; ++i) {
+                vcpu = kvm->vcpus[i];
+                if (!vcpu)
+                        continue;
+                if (test_and_set_bit(KVM_REQ_MMU_RELOAD, &vcpu->requests))
+                        continue;
+                cpu = vcpu->cpu;
+                if (cpu != -1 && cpu != raw_smp_processor_id())
+                        cpu_set(cpu, cpus);
+        }
+        if (cpus_empty(cpus))
+                return;
+        smp_call_function_mask(cpus, ack_flush, NULL, 1);
+}
+
+
 int kvm_vcpu_init(struct kvm_vcpu *vcpu, struct kvm *kvm, unsigned id)
 {
         struct page *page;