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authorAndre Przywara <andre.przywara@arm.com>2016-08-09 10:54:29 +0100
committerChristoffer Dall <christoffer.dall@linaro.org>2016-08-15 23:00:22 +0200
commit505a19eec49ab36b314a05bc062749ebdfb0aa90 (patch)
treee33e93567ccb3da6236f281a892915fcf622b496 /virt
parentc7735769d5dd79afb07254532fabd9ccbd85b1fa (diff)
downloadlinux-stericsson-505a19eec49ab36b314a05bc062749ebdfb0aa90.tar.gz
KVM: arm64: check for ITS device on MSI injection
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>
Diffstat (limited to 'virt')
-rw-r--r--virt/kvm/arm/vgic/vgic-its.c21
1 files changed, 19 insertions, 2 deletions
diff --git a/virt/kvm/arm/vgic/vgic-its.c b/virt/kvm/arm/vgic/vgic-its.c
index 1cf9f598c72a..9533080b47d3 100644
--- a/virt/kvm/arm/vgic/vgic-its.c
+++ b/virt/kvm/arm/vgic/vgic-its.c
@@ -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);