[Xen-devel] [PATCH] Only enable some VT-d features if all VT-d engines support them.

["Cui, Dexuan" <dexuan.cui@xxxxxxxxx>]

By default, we enable snoop control, queued invalidation and interrupt
remapping if all VT-d engines support them, and for DMA passthrough we don't
enable it by default.

A user can use 'iommu=passthrough' to enable DMA passthrough (only for Dom0).
A user can use 'iommu=no-snoop,no-qinval,no-intremap' to disable the 3 features.

Signed-off-by: Dexuan Cui <dexuan.cui@xxxxxxxxx>

Attachment: enable_vtd_features_on_all_engines_or_on_none.patch
Description: enable_vtd_features_on_all_engines_or_on_none.patch

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