This patch is based on Aviv Ben-David (<address@hidden>)'s patch
upstream:
"IOMMU: enable intel_iommu map and unmap notifiers"
https://lists.gnu.org/archive/html/qemu-devel/2016-11/msg01453.html
However I removed/fixed some content, and added my own codes.
Instead of translate() every page for iotlb invalidations (which is
slower), we walk the pages when needed and notify in a hook function.
This patch enables vfio devices for VT-d emulation.
And, since we already have vhost DMAR support via device-iotlb, a
natural benefit that this patch brings is that vt-d enabled vhost can
live even without ATS capability now. Though more tests are needed.
Signed-off-by: Peter Xu <address@hidden>
---
- vtd_page_walk(&ce, 0, ~0, vtd_replay_hook, (void *)n);
+ vtd_page_walk(&ce, 0, ~0, vtd_replay_hook, (void *)n, false);