linux-kernel - Re: [PATCH v3 3/7] iommu/vt-d: Always reserve a domain ID for identity setup

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Message-ID: <ykrcnvpm2wbiwepykl2wmitaabyp3yngw4dborhnlm65ek3ctl@6wteh2n6zrzk>
Date: Wed, 14 Aug 2024 09:31:23 -0700
From: Jerry Snitselaar <jsnitsel@...hat.com>
To: Lu Baolu <baolu.lu@...ux.intel.com>
Cc: Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>, 
	Robin Murphy <robin.murphy@....com>, Jason Gunthorpe <jgg@...pe.ca>, 
	Kevin Tian <kevin.tian@...el.com>, iommu@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 3/7] iommu/vt-d: Always reserve a domain ID for
 identity setup

On Tue, Aug 06, 2024 at 10:39:37AM GMT, Lu Baolu wrote:
> We will use a global static identity domain. Reserve a static domain ID
> for it.
> 
> Signed-off-by: Lu Baolu <baolu.lu@...ux.intel.com>

Reviewed-by: Jerry Snitselaar <jsnitsel@...hat.com>

> ---
>  drivers/iommu/intel/iommu.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c
> index 723ea9f3f501..c019fb3b3e78 100644
> --- a/drivers/iommu/intel/iommu.c
> +++ b/drivers/iommu/intel/iommu.c
> @@ -1440,10 +1440,10 @@ static int iommu_init_domains(struct intel_iommu *iommu)
>  	 * entry for first-level or pass-through translation modes should
>  	 * be programmed with a domain id different from those used for
>  	 * second-level or nested translation. We reserve a domain id for
> -	 * this purpose.
> +	 * this purpose. This domain id is also used for identity domain
> +	 * in legacy mode.
>  	 */
> -	if (sm_supported(iommu))
> -		set_bit(FLPT_DEFAULT_DID, iommu->domain_ids);
> +	set_bit(FLPT_DEFAULT_DID, iommu->domain_ids);
>  
>  	return 0;
>  }
> -- 
> 2.34.1
>