linux-kernel - Re: [PATCH v3 1/7] iommu/vt-d: Require DMA domain if hardware not support passthrough

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Message-ID: <20240806165425.GJ676757@ziepe.ca>
Date: Tue, 6 Aug 2024 13:54:25 -0300
From: Jason Gunthorpe <jgg@...pe.ca>
To: Lu Baolu <baolu.lu@...ux.intel.com>
Cc: Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>,
	Robin Murphy <robin.murphy@....com>,
	Kevin Tian <kevin.tian@...el.com>, iommu@...ts.linux.dev,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 1/7] iommu/vt-d: Require DMA domain if hardware not
 support passthrough

On Tue, Aug 06, 2024 at 10:39:35AM +0800, Lu Baolu wrote:
> The iommu core defines the def_domain_type callback to query the iommu
> driver about hardware capability and quirks. The iommu driver should
> declare IOMMU_DOMAIN_DMA requirement for hardware lacking pass-through
> capability.
> 
> Earlier VT-d hardware implementations did not support pass-through
> translation mode. The iommu driver relied on a paging domain with all
> physical system memory addresses identically mapped to the same IOVA
> to simulate pass-through translation before the def_domain_type was
> introduced and it has been kept until now. It's time to adjust it now
> to make the Intel iommu driver follow the def_domain_type semantics.
> 
> Signed-off-by: Lu Baolu <baolu.lu@...ux.intel.com>
> ---
>  drivers/iommu/intel/iommu.c | 10 ++++++++++
>  1 file changed, 10 insertions(+)

Reviewed-by: Jason Gunthorpe <jgg@...dia.com>

Jason