Re: [PATCH v6 2/4] virtio-iommu: Fix endianness in get_config

[Jean-Philippe Brucker]

On Sat, Nov 27, 2021 at 08:29:08AM +0100, Eric Auger wrote:
> Endianess is not properly handled when populating
> the returned config. Use the cpu_to_le* primitives
> for each separate field. Also, while at it, trace
> the domain range start.
> 
> Signed-off-by: Eric Auger <eric.auger@redhat.com>
> Reported-by: Thomas Huth <thuth@redhat.com>

Reviewed-by: Jean-Philippe Brucker <jean-philippe@linaro.org>

> ---
>  hw/virtio/trace-events   |  2 +-
>  hw/virtio/virtio-iommu.c | 22 +++++++++++++++-------
>  2 files changed, 16 insertions(+), 8 deletions(-)
> 
> diff --git a/hw/virtio/trace-events b/hw/virtio/trace-events
> index 54bd7da00c8..f7ad6be5fbb 100644
> --- a/hw/virtio/trace-events
> +++ b/hw/virtio/trace-events
> @@ -91,7 +91,7 @@ virtio_mmio_setting_irq(int level) "virtio_mmio setting IRQ 
> %d"
>  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_get_config(uint64_t page_size_mask, uint64_t start, uint64_t 
> end, uint32_t domain_start, uint32_t domain_end, uint32_t probe_size) 
> "page_size_mask=0x%"PRIx64" input range start=0x%"PRIx64" input range 
> end=0x%"PRIx64" domain range start=%d domain range end=%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 645c0aa3997..30ee09187b8 100644
> --- a/hw/virtio/virtio-iommu.c
> +++ b/hw/virtio/virtio-iommu.c
> @@ -822,14 +822,22 @@ unlock:
>  static void virtio_iommu_get_config(VirtIODevice *vdev, uint8_t *config_data)
>  {
>      VirtIOIOMMU *dev = VIRTIO_IOMMU(vdev);
> -    struct virtio_iommu_config *config = &dev->config;
> +    struct virtio_iommu_config *dev_config = &dev->config;
> +    struct virtio_iommu_config *out_config = (void *)config_data;
>  
> -    trace_virtio_iommu_get_config(config->page_size_mask,
> -                                  config->input_range.start,
> -                                  config->input_range.end,
> -                                  config->domain_range.end,
> -                                  config->probe_size);
> -    memcpy(config_data, &dev->config, sizeof(struct virtio_iommu_config));
> +    out_config->page_size_mask = cpu_to_le64(dev_config->page_size_mask);
> +    out_config->input_range.start = 
> cpu_to_le64(dev_config->input_range.start);
> +    out_config->input_range.end = cpu_to_le64(dev_config->input_range.end);
> +    out_config->domain_range.start = 
> cpu_to_le32(dev_config->domain_range.start);
> +    out_config->domain_range.end = cpu_to_le32(dev_config->domain_range.end);
> +    out_config->probe_size = cpu_to_le32(dev_config->probe_size);
> +
> +    trace_virtio_iommu_get_config(dev_config->page_size_mask,
> +                                  dev_config->input_range.start,
> +                                  dev_config->input_range.end,
> +                                  dev_config->domain_range.start,
> +                                  dev_config->domain_range.end,
> +                                  dev_config->probe_size);
>  }
>  
>  static uint64_t virtio_iommu_get_features(VirtIODevice *vdev, uint64_t f,
> -- 
> 2.26.3
>