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KVM: MMU: ignore zapped root pagetables

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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>
This commit is contained in:
Marcelo Tosatti
2008-02-20 14:47:24 -05:00
committed by Avi Kivity
parent 847f0ad8cb
commit 2e53d63acb
5 changed files with 48 additions and 2 deletions
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23
virt/kvm/kvm_main.c
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@@ -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;