KVM: kvm_io_bus: Add kvm_io_bus_get_dev() call (8a39d006) · Commits · 戴 / test

The kvm_io_bus framework is a nice place of holding information about various MMIO regions for kernel emulated devices. Add a call to retrieve the kvm_io_device structure which is associated with a certain MMIO address. This avoids to duplicate kvm_io_bus' knowledge of MMIO regions without having to fake MMIO calls if a user needs the device a certain MMIO address belongs to. This will be used by the ITS emulation to get the associated ITS device when someone triggers an MSI via an ioctl from userspace. Signed-off-by:

Andre Przywara <andre.przywara@arm.com> Reviewed-by:

Eric Auger <eric.auger@redhat.com> Reviewed-by:

Marc Zyngier <marc.zyngier@arm.com> Acked-by:

Christoffer Dall <christoffer.dall@linaro.org> Acked-by:

Paolo Bonzini <pbonzini@redhat.com> Tested-by:

Eric Auger <eric.auger@redhat.com> Signed-off-by:

Marc Zyngier <marc.zyngier@arm.com>

include/linux/kvm_host.h

+2 −0

Original line number	Diff line number	Diff line
		@@ -164,6 +164,8 @@ int kvm_io_bus_register_dev(struct kvm *kvm, enum kvm_bus bus_idx, gpa_t addr,
		int len, struct kvm_io_device *dev);
		int kvm_io_bus_unregister_dev(struct kvm *kvm, enum kvm_bus bus_idx,
		struct kvm_io_device *dev);
		struct kvm_io_device kvm_io_bus_get_dev(struct kvm kvm, enum kvm_bus bus_idx,
		gpa_t addr);

		#ifdef CONFIG_KVM_ASYNC_PF
		struct kvm_async_pf {

virt/kvm/kvm_main.c

+24 −0

Original line number	Diff line number	Diff line
		@@ -3496,6 +3496,30 @@ int kvm_io_bus_unregister_dev(struct kvm *kvm, enum kvm_bus bus_idx,
		return r;
		}

		struct kvm_io_device kvm_io_bus_get_dev(struct kvm kvm, enum kvm_bus bus_idx,
		gpa_t addr)
		{
		struct kvm_io_bus *bus;
		int dev_idx, srcu_idx;
		struct kvm_io_device *iodev = NULL;

		srcu_idx = srcu_read_lock(&kvm->srcu);

		bus = srcu_dereference(kvm->buses[bus_idx], &kvm->srcu);

		dev_idx = kvm_io_bus_get_first_dev(bus, addr, 1);
		if (dev_idx < 0)
		goto out_unlock;

		iodev = bus->range[dev_idx].dev;

		out_unlock:
		srcu_read_unlock(&kvm->srcu, srcu_idx);

		return iodev;
		}
		EXPORT_SYMBOL_GPL(kvm_io_bus_get_dev);

		static struct notifier_block kvm_cpu_notifier = {
		.notifier_call = kvm_cpu_hotplug,
		};

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