Re: [PATCH v12 3/5] iommu/vt-d: Add support for IOMMU default DMA mode build options

[Lu Baolu]

On 2021/6/11 20:20, John Garry wrote:
> @@ -453,8 +452,7 @@ static int __init intel_iommu_setup(char *str)
>   			pr_warn("intel_iommu=forcedac deprecated; use iommu.forcedac instead\n");
>   			iommu_dma_forcedac = true;
>   		} else if (!strncmp(str, "strict", 6)) {
> -			pr_info("Disable batched IOTLB flush\n");
> -			intel_iommu_strict = 1;
> +			iommu_set_dma_strict(true);

I would like to deprecate this command line and ask users to use
iommu.strict instead.

--- a/drivers/iommu/intel/iommu.c
+++ b/drivers/iommu/intel/iommu.c
@@ -436,7 +436,7 @@ static int __init intel_iommu_setup(char *str)
                        pr_warn("intel_iommu=forcedac deprecated; use 
iommu.forcedac instead\n");
                        iommu_dma_forcedac = true;
                } else if (!strncmp(str, "strict", 6)) {
-                       pr_info("Disable batched IOTLB flush\n");
+                       pr_warn("intel_iommu=strict deprecated; use 
iommu.strict instead\n");
                        intel_iommu_strict = 1;

Also update Documentation/admin-guide/kernel-parameters.txt accordingly.

Best regards,
baolu