linux-kernel - Re: [PATCH v4 10/23] iommufd/viommu: Introduce IOMMUFD_OBJ_HW

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Message-ID: <aCYg8UsHWn0wCyoW@Asurada-Nvidia>
Date: Thu, 15 May 2025 10:14:25 -0700
From: Nicolin Chen <nicolinc@...dia.com>
To: "Tian, Kevin" <kevin.tian@...el.com>
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Subject: Re: [PATCH v4 10/23] iommufd/viommu: Introduce IOMMUFD_OBJ_HW_QUEUE
 and its related struct

On Thu, May 15, 2025 at 05:58:41AM +0000, Tian, Kevin wrote:
> > From: Nicolin Chen <nicolinc@...dia.com>
> > Sent: Friday, May 9, 2025 11:03 AM
> > 
> > Add IOMMUFD_OBJ_HW_QUEUE with an iommufd_hw_queue structure,
> > representing
> > a HW-accelerated queue type of IOMMU's physical queue that can be passed
> > through to a user space VM for direct hardware control, such as:
> >  - NVIDIA's Virtual Command Queue
> >  - AMD vIOMMU's Command Buffer, Event Log Buffer, and PPR Log Buffer
> > 
> > Introduce an allocator iommufd_hw_queue_alloc(). And add a pair of
> > viommu
> > ops for iommufd to forward user space ioctls to IOMMU drivers.
> > 
> > Given that the first user of this HW QUEUE (tegra241-cmdqv) will need to
> > ensure the queue memory to be physically contiguous, add a flag property
> > in iommufd_viommu_ops and
> > IOMMUFD_VIOMMU_FLAG_HW_QUEUE_READS_PA to allow
> > driver to flag it so that the core will validate the physical pages of a
> > given guest queue.
> 
> 'READS' is confusing here. What about xxx_CONTIG_PAS?

Sure.

> > + * @hw_queue_alloc: Allocate a HW QUEUE object for a HW-accelerated
> > queue given
> > + *                  the @type (must be defined in include/uapi/linux/iommufd.h)
> > + *                  for the @viommu. @index carries the logical HW QUEUE ID per
> > + *                  @viommu in a guest VM, for a multi-queue case; @addr carries
> > + *                  the guest physical base address of the queue memory; 
> 
> s/@...r/@...e_addr/
> 
> Reviewed-by: Kevin Tian <kevin.tian@...el.com>

Thanks!
Nicolin