[PATCH] eal: fix DMA mask validation inconsistency in IOVA VA

[Burakov, Anatoly]

On 9/8/2025 6:34 PM, Shani Peretz wrote:
> When --iova-mode is explicitly specified in command line, DMA mask
> constraints were not being validated, leading to potential runtime
> failures when device DMA capabilities are exceeded.
> 
> The issue occurred because rte_bus_get_iommu_class() was only called
> during IOVA mode auto-detection, but this function has the important
> side effect of triggering DMA mask detection (e.g., Intel IOMMU
> address width checking via pci_device_iommu_support_va()).
> 
> This created an inconsistency, when choosing explicit mode,
> the DMA checks are bypassed, but when choosing auto-detection mode,
> the constraints are checked and enforced.
> 
> The fix moves rte_bus_get_iommu_class() outside the conditional logic
> to ensure it's always called during EAL initialization.
> 
> Fixes: 4374ebc24bc1 ("malloc: modify error message for DMA mask check")
> Cc: stable at dpdk.org
> 
> Signed-off-by: Shani Peretz <shperetz at nvidia.com>
> ---

Acked-by: Anatoly Burakov <anatoly.burakov at intel.com>

-- 
Thanks,
Anatoly