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Commit 8a39d006 authored by Andre Przywara's avatar Andre Przywara Committed by Marc Zyngier
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KVM: kvm_io_bus: Add kvm_io_bus_get_dev() call 



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: default avatarAndre Przywara <andre.przywara@arm.com>
Reviewed-by: default avatarEric Auger <eric.auger@redhat.com>
Reviewed-by: default avatarMarc Zyngier <marc.zyngier@arm.com>
Acked-by: default avatarChristoffer Dall <christoffer.dall@linaro.org>
Acked-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
Tested-by: default avatarEric Auger <eric.auger@redhat.com>
Signed-off-by: default avatarMarc Zyngier <marc.zyngier@arm.com>
parent b46f01ce

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,

};