Re: [PATCH v13 4/6] iommu/vt-d: Add support for IOMMU default DMA mode build options
From: Lu Baolu <baolu.lu@linux.intel.com>
Date: 2021-06-17 07:33:56
Also in:
linux-iommu, lkml
On 6/16/21 7:03 PM, John Garry wrote:
quoted hunk ↗ jump to hunk
@@ -4382,9 +4380,9 @@ int __init intel_iommu_init(void) * is likely to be much lower than the overhead of synchronizing * the virtual and physical IOMMU page-tables. */ - if (!intel_iommu_strict && cap_caching_mode(iommu->cap)) { - pr_warn("IOMMU batching is disabled due to virtualization"); - intel_iommu_strict = 1; + if (cap_caching_mode(iommu->cap)) { + pr_warn("IOMMU batching disallowed due to virtualization\n"); + iommu_set_dma_strict(true);
With this change, VM guest will always show this warning. How about removing this message? Users could get the same information through the kernel message added by "[PATCH v13 2/6] iommu: Print strict or lazy mode at init time". Best regards, baolu