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| author | Marcelo Tosatti <mtosatti@redhat.com> | 2008-02-20 14:47:24 -0500 |
|---|---|---|
| committer | Avi Kivity <avi@qumranet.com> | 2008-04-27 11:53:25 +0300 |
| commit | 2e53d63acba75795aa226febd140f67c58c6a353 (patch) | |
| tree | be4ad4e5b28c737053af78a950d270a657e9f628 /virt | |
| parent | 847f0ad8cbfa70c1af6948025836dfbd9ed6da1e (diff) | |
| download | linux-3.10-2e53d63acba75795aa226febd140f67c58c6a353.tar.gz linux-3.10-2e53d63acba75795aa226febd140f67c58c6a353.tar.bz2 linux-3.10-2e53d63acba75795aa226febd140f67c58c6a353.zip | |
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>
Diffstat (limited to 'virt')
| -rw-r--r-- | virt/kvm/kvm_main.c | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index cf6df5167af..c41eb57ce29 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; |