* [PATCH] KVM: arm64: check for ITS device on MSI injection
@ 2016-08-09 9:54 ` Andre Przywara
0 siblings, 0 replies; 4+ messages in thread
From: Andre Przywara @ 2016-08-09 9:54 UTC (permalink / raw)
To: Marc Zyngier, Christoffer Dall; +Cc: kvmarm, linux-arm-kernel
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.
Signed-off-by: Andre Przywara <andre.przywara@arm.com>
---
virt/kvm/arm/vgic/vgic-its.c | 25 +++++++++++++++++++++----
1 file changed, 21 insertions(+), 4 deletions(-)
diff --git a/virt/kvm/arm/vgic/vgic-its.c b/virt/kvm/arm/vgic/vgic-its.c
index 18a6871..9aeb3a4 100644
--- a/virt/kvm/arm/vgic/vgic-its.c
+++ b/virt/kvm/arm/vgic/vgic-its.c
@@ -471,6 +471,24 @@ 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)
+ return NULL;
+
+ 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.
@@ -493,10 +511,9 @@ int vgic_its_inject_msi(struct kvm *kvm, struct kvm_msi *msi)
address = (u64)msi->address_hi << 32 | msi->address_lo;
kvm_io_dev = kvm_io_bus_get_dev(kvm, KVM_MMIO_BUS, address);
- if (!kvm_io_dev)
- return -ENODEV;
-
- 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);
--
2.9.0
^ permalink raw reply related [flat|nested] 4+ messages in thread
* [PATCH] KVM: arm64: check for ITS device on MSI injection
@ 2016-08-09 9:54 ` Andre Przywara
0 siblings, 0 replies; 4+ messages in thread
From: Andre Przywara @ 2016-08-09 9:54 UTC (permalink / raw)
To: linux-arm-kernel
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.
Signed-off-by: Andre Przywara <andre.przywara@arm.com>
---
virt/kvm/arm/vgic/vgic-its.c | 25 +++++++++++++++++++++----
1 file changed, 21 insertions(+), 4 deletions(-)
diff --git a/virt/kvm/arm/vgic/vgic-its.c b/virt/kvm/arm/vgic/vgic-its.c
index 18a6871..9aeb3a4 100644
--- a/virt/kvm/arm/vgic/vgic-its.c
+++ b/virt/kvm/arm/vgic/vgic-its.c
@@ -471,6 +471,24 @@ 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)
+ return NULL;
+
+ 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.
@@ -493,10 +511,9 @@ int vgic_its_inject_msi(struct kvm *kvm, struct kvm_msi *msi)
address = (u64)msi->address_hi << 32 | msi->address_lo;
kvm_io_dev = kvm_io_bus_get_dev(kvm, KVM_MMIO_BUS, address);
- if (!kvm_io_dev)
- return -ENODEV;
-
- 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);
--
2.9.0
^ permalink raw reply related [flat|nested] 4+ messages in thread
* Re: [PATCH] KVM: arm64: check for ITS device on MSI injection
2016-08-09 9:54 ` Andre Przywara
@ 2016-08-09 14:48 ` Christoffer Dall
-1 siblings, 0 replies; 4+ messages in thread
From: Christoffer Dall @ 2016-08-09 14:48 UTC (permalink / raw)
To: Andre Przywara; +Cc: Marc Zyngier, kvmarm, linux-arm-kernel
On Tue, Aug 09, 2016 at 10:54:29AM +0100, Andre Przywara wrote:
> 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.
>
> Signed-off-by: Andre Przywara <andre.przywara@arm.com>
> ---
> virt/kvm/arm/vgic/vgic-its.c | 25 +++++++++++++++++++++----
> 1 file changed, 21 insertions(+), 4 deletions(-)
>
> diff --git a/virt/kvm/arm/vgic/vgic-its.c b/virt/kvm/arm/vgic/vgic-its.c
> index 18a6871..9aeb3a4 100644
> --- a/virt/kvm/arm/vgic/vgic-its.c
> +++ b/virt/kvm/arm/vgic/vgic-its.c
> @@ -471,6 +471,24 @@ 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)
> + return NULL;
this feels defensive. Wouldn't it make more sense to check the return
of kvm_io_bus_get_dev where its' called, and then conditionally call
this function?
Otherwise:
Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
> +
> + 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.
> @@ -493,10 +511,9 @@ int vgic_its_inject_msi(struct kvm *kvm, struct kvm_msi *msi)
> address = (u64)msi->address_hi << 32 | msi->address_lo;
>
> kvm_io_dev = kvm_io_bus_get_dev(kvm, KVM_MMIO_BUS, address);
> - if (!kvm_io_dev)
> - return -ENODEV;
> -
> - 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);
> --
> 2.9.0
>
^ permalink raw reply [flat|nested] 4+ messages in thread
* [PATCH] KVM: arm64: check for ITS device on MSI injection
@ 2016-08-09 14:48 ` Christoffer Dall
0 siblings, 0 replies; 4+ messages in thread
From: Christoffer Dall @ 2016-08-09 14:48 UTC (permalink / raw)
To: linux-arm-kernel
On Tue, Aug 09, 2016 at 10:54:29AM +0100, Andre Przywara wrote:
> 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.
>
> Signed-off-by: Andre Przywara <andre.przywara@arm.com>
> ---
> virt/kvm/arm/vgic/vgic-its.c | 25 +++++++++++++++++++++----
> 1 file changed, 21 insertions(+), 4 deletions(-)
>
> diff --git a/virt/kvm/arm/vgic/vgic-its.c b/virt/kvm/arm/vgic/vgic-its.c
> index 18a6871..9aeb3a4 100644
> --- a/virt/kvm/arm/vgic/vgic-its.c
> +++ b/virt/kvm/arm/vgic/vgic-its.c
> @@ -471,6 +471,24 @@ 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)
> + return NULL;
this feels defensive. Wouldn't it make more sense to check the return
of kvm_io_bus_get_dev where its' called, and then conditionally call
this function?
Otherwise:
Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
> +
> + 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.
> @@ -493,10 +511,9 @@ int vgic_its_inject_msi(struct kvm *kvm, struct kvm_msi *msi)
> address = (u64)msi->address_hi << 32 | msi->address_lo;
>
> kvm_io_dev = kvm_io_bus_get_dev(kvm, KVM_MMIO_BUS, address);
> - if (!kvm_io_dev)
> - return -ENODEV;
> -
> - 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);
> --
> 2.9.0
>
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2016-08-09 14:48 UTC | newest]
Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
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2016-08-09 9:54 [PATCH] KVM: arm64: check for ITS device on MSI injection Andre Przywara
2016-08-09 9:54 ` Andre Przywara
2016-08-09 14:48 ` Christoffer Dall
2016-08-09 14:48 ` Christoffer Dall
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