diff options
| author | Jason Gunthorpe <jgg@nvidia.com> | 2025-11-27 19:54:07 -0400 |
|---|---|---|
| committer | Joerg Roedel <joerg.roedel@amd.com> | 2025-11-28 08:43:03 +0100 |
| commit | d856f9d27885c499d96ab7fe506083346ccf145d (patch) | |
| tree | 7a42d454bfd1f0e2f6aec9ffc87571fa7b9fae3d /include/linux/generic_pt | |
| parent | 416d9a220e678d6b1c5fc206226cfb7fa7efa80e (diff) | |
iommupt/vtd: Allow VT-d to have a larger table top than the vasz requires
VT-d second stage HW specifies both the maximum IOVA and the supported
table walk starting points. Weirdly there is HW that only supports a 4
level walk but has a maximum IOVA that only needs 3.
The current code miscalculates this and creates a wrongly sized page table
which ultimately fails the compatibility check for number of levels.
This is fixed by allowing the page table to be created with both a vasz
and top_level input. The vasz will set the aperture for the domain while
the top_level will set the page table geometry.
Add top_level to vtdss and correct the logic in VT-d to generate the right
top_level and vasz from mgaw and sagaw.
Fixes: d373449d8e97 ("iommu/vt-d: Use the generic iommu page table")
Reported-by: Calvin Owens <calvin@wbinvd.org>
Closes: https://lore.kernel.org/r/8f257d2651eb8a4358fcbd47b0145002e5f1d638.1764237717.git.calvin@wbinvd.org
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: Lu Baolu <baolu.lu@linux.intel.com>
Tested-by: Calvin Owens <calvin@wbinvd.org>
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Diffstat (limited to 'include/linux/generic_pt')
| -rw-r--r-- | include/linux/generic_pt/iommu.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/generic_pt/iommu.h b/include/linux/generic_pt/iommu.h index cfe05a77f86b..c134132ed10f 100644 --- a/include/linux/generic_pt/iommu.h +++ b/include/linux/generic_pt/iommu.h @@ -264,6 +264,8 @@ IOMMU_PROTOTYPES(amdv1_mock); struct pt_iommu_vtdss_cfg { struct pt_iommu_cfg common; + /* 4 is a 57 bit 5 level table */ + unsigned int top_level; }; struct pt_iommu_vtdss_hw_info { |