RE: [PATCH 02/10] iommu/vt-d: Set IOASID capacity when SVM is enabled

[Tian, Kevin]

> From: Jacob Pan <jacob.jun.pan@xxxxxxxxxxxxxxx>
> Sent: Thursday, March 26, 2020 1:55 AM
> 
> Assign system-wide PASID capacity with enumerated max value.
> Currently, all Intel SVM capable devices should support full 20 bits of
> PASID value.
> 
> Signed-off-by: Jacob Pan <jacob.jun.pan@xxxxxxxxxxxxxxx>
> ---
>  drivers/iommu/intel-iommu.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
> index a699a765c983..ec3fc121744a 100644
> --- a/drivers/iommu/intel-iommu.c
> +++ b/drivers/iommu/intel-iommu.c
> @@ -3510,6 +3510,10 @@ static int __init init_dmars(void)
>  	if (ret)
>  		goto free_iommu;
> 
> +	/* PASID is needed for scalable mode irrespective to SVM */
> +	if (intel_iommu_sm)
> +		ioasid_install_capacity(intel_pasid_max_id);
> +
>  	/*
>  	 * for each drhd
>  	 *   enable fault log
> --
> 2.7.4

Reviewed-by: Kevin Tian <kevin.tian@xxxxxxxxx>