linux-kernel - Re: [PATCH v3 6/7] iommu/vt-d: Add support for static identity domain

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Message-ID: <20240806171854.GO676757@ziepe.ca>
Date: Tue, 6 Aug 2024 14:18:54 -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 6/7] iommu/vt-d: Add support for static identity domain

On Tue, Aug 06, 2024 at 10:39:40AM +0800, Lu Baolu wrote:
> Software determines VT-d hardware support for passthrough translation by
> inspecting the capability register. If passthrough translation is not
> supported, the device is instructed to use DMA domain for its default
> domain.
> 
> Add a global static identity domain with guaranteed attach semantics for
> IOMMUs that support passthrough translation mode.
> 
> Signed-off-by: Lu Baolu <baolu.lu@...ux.intel.com>
> ---
>  drivers/iommu/intel/iommu.c | 102 ++++++++++++++++++++++++++++++++++++
>  1 file changed, 102 insertions(+)

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

> +static int identity_domain_attach_dev(struct iommu_domain *domain, struct device *dev)
> +{
> +	struct device_domain_info *info = dev_iommu_priv_get(dev);
> +	struct intel_iommu *iommu = info->iommu;
> +	int ret;
> +
> +	device_block_translation(dev);

Though it would be nice if this wasn't hitfull like this, someday..

Jason