Re: [PATCH v6 4/4] dmaengine/idxd: Re-enable kernel workqueue under DMA API

[Baolu Lu]

On 5/20/23 4:32 AM, Jacob Pan wrote:
> Kernel workqueues were disabled due to flawed use of kernel VA and SVA
> API. Now that we have the support for attaching PASID to the device's
> default domain and the ability to reserve global PASIDs from SVA APIs,
> we can re-enable the kernel work queues and use them under DMA API.
>
> We also use non-privileged access for in-kernel DMA to be consistent
> with the IOMMU settings. Consequently, interrupt for user privilege is
> enabled for work completion IRQs.
>
> Link:https://lore.kernel.org/linux-iommu/20210511194726.GP1002214@xxxxxxxxxx/
> Reviewed-by: Dave Jiang<dave.jiang@xxxxxxxxx>
> Reviewed-by: Fenghua Yu<fenghua.yu@xxxxxxxxx>
> Signed-off-by: Jacob Pan<jacob.jun.pan@xxxxxxxxxxxxxxx>

Reviewed-by: Lu Baolu <baolu.lu@xxxxxxxxxxxxxxx>

Best regards,
baolu