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Subject: Re: [PATCH v4 1/2] virtio: let arch validate VIRTIO features
To:     Cornelia Huck <cohuck@redhat.com>
Cc:     linux-kernel@vger.kernel.org, pasic@linux.ibm.com,
        borntraeger@de.ibm.com, frankja@linux.ibm.com, mst@redhat.com,
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        linux-s390@vger.kernel.org,
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References: <1594111477-15401-1-git-send-email-pmorel@linux.ibm.com>
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 <20200707112652.42fcab80.cohuck@redhat.com>
From:   Pierre Morel <pmorel@linux.ibm.com>
Message-ID: <7bdd36e4-a626-18e0-bc7a-fe1fe1b877d8@linux.ibm.com>
Date:   Tue, 7 Jul 2020 12:39:43 +0200
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On 2020-07-07 11:26, Cornelia Huck wrote:
> On Tue,  7 Jul 2020 10:44:36 +0200
> Pierre Morel <pmorel@linux.ibm.com> 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@linux.ibm.com>
>> ---
>>   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@redhat.com>
> 

Thanks for the review.

regards,
Pierre


-- 
Pierre Morel
IBM Lab Boeblingen