KVM: x86: clear bus pointer when destroyed (df630b8c) · Commits · 戴 / test

When releasing the bus, let's clear the bus pointers to mark it out. If any further device unregister happens on this bus, we know that we're done if we found the bus being released already. Signed-off-by:

Peter Xu <peterx@redhat.com> Signed-off-by:

Radim Krčmář <rkrcmar@redhat.com>

virt/kvm/kvm_main.c

+11 −1

Original line number	Diff line number	Diff line
		@@ -727,8 +727,10 @@ static void kvm_destroy_vm(struct kvm *kvm)
		list_del(&kvm->vm_list);
		spin_unlock(&kvm_lock);
		kvm_free_irq_routing(kvm);
		for (i = 0; i < KVM_NR_BUSES; i++)
		for (i = 0; i < KVM_NR_BUSES; i++) {
		kvm_io_bus_destroy(kvm->buses[i]);
		kvm->buses[i] = NULL;
		}
		kvm_coalesced_mmio_free(kvm);
		#if defined(CONFIG_MMU_NOTIFIER) && defined(KVM_ARCH_WANT_MMU_NOTIFIER)
		mmu_notifier_unregister(&kvm->mmu_notifier, kvm->mm);
		@@ -3579,6 +3581,14 @@ int kvm_io_bus_unregister_dev(struct kvm *kvm, enum kvm_bus bus_idx,
		struct kvm_io_bus new_bus, bus;

		bus = kvm->buses[bus_idx];

		/*
		* It's possible the bus being released before hand. If so,
		* we're done here.
		*/
		if (!bus)
		return 0;

		r = -ENOENT;
		for (i = 0; i < bus->dev_count; i++)
		if (bus->range[i].dev == dev) {

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