From: Maxim Levitsky mlevitsk@redhat.com
commit 6fcee03df6a1a3101a77344be37bb85c6142d56c upstream.
This can cause various unexpected issues, since VM is partially destroyed at that point.
For example when AVIC is enabled, this causes avic_vcpu_load to access physical id page entry which is already freed by .vm_destroy.
Fixes: 8221c1370056 ("svm: Manage vcpu load/unload when enable AVIC") Cc: stable@vger.kernel.org Signed-off-by: Maxim Levitsky mlevitsk@redhat.com Message-Id: 20220322172449.235575-2-mlevitsk@redhat.com Signed-off-by: Paolo Bonzini pbonzini@redhat.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- arch/x86/kvm/x86.c | 10 +++------- 1 file changed, 3 insertions(+), 7 deletions(-)
--- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -11655,20 +11655,15 @@ static void kvm_unload_vcpu_mmu(struct k vcpu_put(vcpu); }
-static void kvm_free_vcpus(struct kvm *kvm) +static void kvm_unload_vcpu_mmus(struct kvm *kvm) { unsigned long i; struct kvm_vcpu *vcpu;
- /* - * Unpin any mmu pages first. - */ kvm_for_each_vcpu(i, vcpu, kvm) { kvm_clear_async_pf_completion_queue(vcpu); kvm_unload_vcpu_mmu(vcpu); } - - kvm_destroy_vcpus(kvm); }
void kvm_arch_sync_events(struct kvm *kvm) @@ -11774,11 +11769,12 @@ void kvm_arch_destroy_vm(struct kvm *kvm __x86_set_memory_region(kvm, TSS_PRIVATE_MEMSLOT, 0, 0); mutex_unlock(&kvm->slots_lock); } + kvm_unload_vcpu_mmus(kvm); static_call_cond(kvm_x86_vm_destroy)(kvm); kvm_free_msr_filter(srcu_dereference_check(kvm->arch.msr_filter, &kvm->srcu, 1)); kvm_pic_destroy(kvm); kvm_ioapic_destroy(kvm); - kvm_free_vcpus(kvm); + kvm_destroy_vcpus(kvm); kvfree(rcu_dereference_check(kvm->arch.apic_map, 1)); kfree(srcu_dereference_check(kvm->arch.pmu_event_filter, &kvm->srcu, 1)); kvm_mmu_uninit_vm(kvm);