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KVM: arm64: check for ITS device on MSI injection

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When userspace provides the doorbell address for an MSI to be
injected into the guest, we find a KVM device which feels responsible.
Lets check that this device is really an emulated ITS before we make
real use of the container_of-ed pointer.

  [ Moved NULL-pointer check to caller of static function
    - Christoffer ]

Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
This commit is contained in:
Andre Przywara 2016-08-09 10:54:29 +01:00 committed by Christoffer Dall
parent c7735769d5
commit 505a19eec4
1 changed files with 19 additions and 2 deletions
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21
virt/kvm/arm/vgic/vgic-its.c
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@ -471,6 +471,21 @@ static int vgic_its_trigger_msi(struct kvm *kvm, struct vgic_its *its,
return 0;
}
static struct vgic_io_device *vgic_get_its_iodev(struct kvm_io_device *dev)
{
struct vgic_io_device *iodev;
if (dev->ops != &kvm_io_gic_ops)
return NULL;
iodev = container_of(dev, struct vgic_io_device, dev);
if (iodev->iodev_type != IODEV_ITS)
return NULL;
return iodev;
}
/*
* Queries the KVM IO bus framework to get the ITS pointer from the given
* doorbell address.
@ -494,9 +509,11 @@ int vgic_its_inject_msi(struct kvm *kvm, struct kvm_msi *msi)
kvm_io_dev = kvm_io_bus_get_dev(kvm, KVM_MMIO_BUS, address);
if (!kvm_io_dev)
return -ENODEV;
return -EINVAL;
iodev = container_of(kvm_io_dev, struct vgic_io_device, dev);
iodev = vgic_get_its_iodev(kvm_io_dev);
if (!iodev)
return -EINVAL;
mutex_lock(&iodev->its->its_lock);
ret = vgic_its_trigger_msi(kvm, iodev->its, msi->devid, msi->data);