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authorLu Baolu <[email protected]>2023-11-22 11:26:03 +0800
committerJoerg Roedel <[email protected]>2023-11-27 11:07:51 +0100
commit0f5432a9b839847dcfe9fa369d72e3d646102ddf (patch)
treecb0c12860a622c6794190d764a0edd5fe3adc5db /scripts/gdb/linux/utils.py
parente645c20e8e9cde549bc233435d3c1338e1cd27fe (diff)
iommu/vt-d: Omit devTLB invalidation requests when TES=0
The latest VT-d spec indicates that when remapping hardware is disabled (TES=0 in Global Status Register), upstream ATS Invalidation Completion requests are treated as UR (Unsupported Request). Consequently, the spec recommends in section 4.3 Handling of Device-TLB Invalidations that software refrain from submitting any Device-TLB invalidation requests when address remapping hardware is disabled. Verify address remapping hardware is enabled prior to submitting Device- TLB invalidation requests. Fixes: 792fb43ce2c9 ("iommu/vt-d: Enable Intel IOMMU scalable mode by default") Signed-off-by: Lu Baolu <[email protected]> Reviewed-by: Kevin Tian <[email protected]> Link: https://lore.kernel.org/r/[email protected] Signed-off-by: Joerg Roedel <[email protected]>
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