Re: [PATCH v4 1/2] virtio: let arch validate VIRTIO features

From: Pierre Morel
Date: Tue Jul 07 2020 - 06:39:56 EST




On 2020-07-07 11:26, Cornelia Huck wrote:
On Tue, 7 Jul 2020 10:44:36 +0200
Pierre Morel <pmorel@xxxxxxxxxxxxx> wrote:

An architecture may need to validate the VIRTIO devices features
based on architecture specificities.

s/specifities/specifics/

OK



Signed-off-by: Pierre Morel <pmorel@xxxxxxxxxxxxx>
---
drivers/virtio/virtio.c | 19 +++++++++++++++++++
include/linux/virtio_config.h | 1 +
2 files changed, 20 insertions(+)

diff --git a/drivers/virtio/virtio.c b/drivers/virtio/virtio.c
index a977e32a88f2..3179a8aa76f5 100644
--- a/drivers/virtio/virtio.c
+++ b/drivers/virtio/virtio.c
@@ -167,6 +167,21 @@ void virtio_add_status(struct virtio_device *dev, unsigned int status)
}
EXPORT_SYMBOL_GPL(virtio_add_status);
+/*
+ * arch_needs_virtio_iommu_platform - provide arch specific hook when finalizing

s/arch_needs_virtio_iommu_platform/arch_validate_virtio_features/

:)

grrr... yes.


+ * features for VIRTIO device dev
+ * @dev: the VIRTIO device being added
+ *
+ * Permits the platform to provide architecture specific functionality when

s/provide architecture specific functionality/handle architecture-specific requirements/

?

better, thanks.


+ * devices features are finalized. This is the default implementation.

s/devices/device/

yes.


+ * Architecture implementations can override this.
+ */
+
+int __weak arch_validate_virtio_features(struct virtio_device *dev)
+{
+ return 0;
+}
+
int virtio_finalize_features(struct virtio_device *dev)
{
int ret = dev->config->finalize_features(dev);
@@ -176,6 +191,10 @@ int virtio_finalize_features(struct virtio_device *dev)
if (ret)
return ret;
+ ret = arch_validate_virtio_features(dev);
+ if (ret)
+ return ret;
+
if (!virtio_has_feature(dev, VIRTIO_F_VERSION_1))
return 0;
diff --git a/include/linux/virtio_config.h b/include/linux/virtio_config.h
index bb4cc4910750..3f4117adf311 100644
--- a/include/linux/virtio_config.h
+++ b/include/linux/virtio_config.h
@@ -459,4 +459,5 @@ static inline void virtio_cwrite64(struct virtio_device *vdev,
_r; \
})
+int arch_validate_virtio_features(struct virtio_device *dev);
#endif /* _LINUX_VIRTIO_CONFIG_H */

With the wording fixed,

Reviewed-by: Cornelia Huck <cohuck@xxxxxxxxxx>


Thanks for the review.

regards,
Pierre


--
Pierre Morel
IBM Lab Boeblingen