From 2e53d63acba75795aa226febd140f67c58c6a353 Mon Sep 17 00:00:00 2001 From: Marcelo Tosatti Date: Wed, 20 Feb 2008 14:47:24 -0500 Subject: 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 Cc: Anthony Liguori Signed-off-by: Avi Kivity --- virt/kvm/kvm_main.c | 23 +++++++++++++++++++++++ 1 file changed, 23 insertions(+) (limited to 'virt') 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; -- cgit v1.2.3