This series adds the missing cache flush and dirty track set for nested parent domain (it's s2_domain but used as parent) which has no insight into devices/DID's under the nested domain (a.k.a s1_domain). This results in missing cache flush per parent domain change and incomplete dirty tracking set on the parent domain. There was a discussion about this in the mailing list [1].
This series adds a s1_domains list in the parent domain to track the nested domains. Hence, the driver can loop the nested domains and use the DIDs of the nested domain to flush iotlb. The driver can also loop the nested domains and nested domain's devices list to flush device iotlb and set the dirty tracking completely.
This series doesn't touch the pasid iotlb or the pasid devtlb as there is no support of attaching pasid to nested domain yet. It will be covered when that feature is enabled.
The complete code can be found at[2], this has been tested with a hacky Qemu[3] to test the unmap on parent domain and dirty tracking set on parent domain. This just verifies the new path. So appreciated to see t-b with regression tests.
This aims to the 6.8 rc#, so your special attention is welcomed.
[1] https://lore.kernel.org/linux-iommu/92f8aaca-093d-4161-b8f2-5ab1680df769@int... [2] https://github.com/yiliu1765/iommufd/tree/vtd_nesting_fixes [3] https://github.com/yiliu1765/qemu/tree/tmp/for-testing-unmap-and-dirty-set-o...
base commit: 547ab8fc4cb04a1a6b34377dd8fad34cd2c8a8e3
Regards, Yi Liu
Yi Liu (8): iommu/vt-d: Track nested domains in parent iommu/vt-d: Add __iommu_flush_iotlb_psi() iommu/vt-d: Add missing iotlb flush for parent domain iommu/vt-d: Update iotlb in nested domain attach iommu/vt-d: Add missing device iotlb flush for parent domain iommu/vt-d: Remove @domain parameter from intel_pasid_setup_dirty_tracking() iommu/vt-d: Wrap the dirty tracking loop to be a helper iommu/vt-d: Add missing dirty tracking set for parent domain
drivers/iommu/intel/iommu.c | 213 ++++++++++++++++++++++++++--------- drivers/iommu/intel/iommu.h | 7 ++ drivers/iommu/intel/nested.c | 12 ++ drivers/iommu/intel/pasid.c | 3 +- drivers/iommu/intel/pasid.h | 1 - 5 files changed, 182 insertions(+), 54 deletions(-)