Re: [PATCH v6 1/4] virtio-iommu: Remove set_config callback

[Eric Auger]

Hi,
On 11/27/21 8:29 AM, Eric Auger wrote:
> The spec says "the driver must not write to device configuration
> fields". So remove the set_config() callback which anyway did
> not do anything.
Forgot to mention that with the advent of  VIRTIO_IOMMU_F_BYPASS_CONFIG
feature and bypass field in struct virtio_iommu_config coming, this will
change soon. Only the bypass field will be settable. But this is not yet
available in the imported linux header.

Thanks

Eric

>
> Signed-off-by: Eric Auger <eric.auger@redhat.com>
> ---
>  hw/virtio/trace-events   |  1 -
>  hw/virtio/virtio-iommu.c | 14 --------------
>  2 files changed, 15 deletions(-)
>
> diff --git a/hw/virtio/trace-events b/hw/virtio/trace-events
> index 650e521e351..54bd7da00c8 100644
> --- a/hw/virtio/trace-events
> +++ b/hw/virtio/trace-events
> @@ -92,7 +92,6 @@ virtio_iommu_device_reset(void) "reset!"
>  virtio_iommu_get_features(uint64_t features) "device supports 
> features=0x%"PRIx64
>  virtio_iommu_device_status(uint8_t status) "driver status = %d"
>  virtio_iommu_get_config(uint64_t page_size_mask, uint64_t start, uint64_t 
> end, uint32_t domain_range, uint32_t probe_size) "page_size_mask=0x%"PRIx64" 
> start=0x%"PRIx64" end=0x%"PRIx64" domain_range=%d probe_size=0x%x"
> -virtio_iommu_set_config(uint64_t page_size_mask, uint64_t start, uint64_t 
> end, uint32_t domain_range, uint32_t probe_size) "page_size_mask=0x%"PRIx64" 
> start=0x%"PRIx64" end=0x%"PRIx64" domain_bits=%d probe_size=0x%x"
>  virtio_iommu_attach(uint32_t domain_id, uint32_t ep_id) "domain=%d 
> endpoint=%d"
>  virtio_iommu_detach(uint32_t domain_id, uint32_t ep_id) "domain=%d 
> endpoint=%d"
>  virtio_iommu_map(uint32_t domain_id, uint64_t virt_start, uint64_t virt_end, 
> uint64_t phys_start, uint32_t flags) "domain=%d virt_start=0x%"PRIx64" 
> virt_end=0x%"PRIx64 " phys_start=0x%"PRIx64" flags=%d"
> diff --git a/hw/virtio/virtio-iommu.c b/hw/virtio/virtio-iommu.c
> index 1b23e8e18c7..645c0aa3997 100644
> --- a/hw/virtio/virtio-iommu.c
> +++ b/hw/virtio/virtio-iommu.c
> @@ -832,19 +832,6 @@ static void virtio_iommu_get_config(VirtIODevice *vdev, 
> uint8_t *config_data)
>      memcpy(config_data, &dev->config, sizeof(struct virtio_iommu_config));
>  }
>  
> -static void virtio_iommu_set_config(VirtIODevice *vdev,
> -                                      const uint8_t *config_data)
> -{
> -    struct virtio_iommu_config config;
> -
> -    memcpy(&config, config_data, sizeof(struct virtio_iommu_config));
> -    trace_virtio_iommu_set_config(config.page_size_mask,
> -                                  config.input_range.start,
> -                                  config.input_range.end,
> -                                  config.domain_range.end,
> -                                  config.probe_size);
> -}
> -
>  static uint64_t virtio_iommu_get_features(VirtIODevice *vdev, uint64_t f,
>                                            Error **errp)
>  {
> @@ -1185,7 +1172,6 @@ static void virtio_iommu_class_init(ObjectClass *klass, 
> void *data)
>      vdc->unrealize = virtio_iommu_device_unrealize;
>      vdc->reset = virtio_iommu_device_reset;
>      vdc->get_config = virtio_iommu_get_config;
> -    vdc->set_config = virtio_iommu_set_config;
>      vdc->get_features = virtio_iommu_get_features;
>      vdc->set_status = virtio_iommu_set_status;
>      vdc->vmsd = &vmstate_virtio_iommu_device;