Re: [PATCH v2 0/9] iommu/vt-d: Support a new DMAR flag

On 7/2/26 14:12, Kevin Tian wrote:
> VT-d spec v5.2 introduces a new DMA_REMAP_OPT_OUT flag in the DMAR
> table, adding another knob to affect whether the DMA remapping
> capability should be turned on or off.
> 
> While at it, first clean up the existing on/off policy messed with
> user opts and various force_on conditions in the first 8 patches.
> 
> On top of the improved framework, the last patch introduces the
> support of the new bit.
> 
> Some cleanups will be done after this series:
> - Cache dmar->flags instead of reading ACPI table multiple times
> - Check intel_iommu_enabled at runtime instead of using dmar_policy
> - Clean up existing warning messages (e.g. force_on panic message
>    always has the "tboot:" prefix)
> 
> v2:
> - Rebase to 7.2-rc1
> - Policy-oriented renaming to avoid confusion with runtime state (Baolu)
> - Warning message/comment improvements (Baolu)
> - Always return error for unsupported force_on type
> - No need to do platform optin if tboot already forces on (old behavior)
> 
> v1:
> https://lore.kernel.org/linux-iommu/20260604051540.592925-1- 
> [email protected]/
> 
> Kevin Tian (9):
>    iommu/vt-d: Fix no_iommu to disable platform optin
>    iommu/vt-d: Force requesting ACS when tboot is enabled
>    iommu/vt-d: Remove dead code when CONFIG_INTEL_IOMMU is not set
>    iommu/vt-d: Consolidate dmar policy management and force_on logic
>    iommu/vt-d: Use dmar_can_force_on() for platform optin
>    iommu/vt-d: Call dmar_can_force_on() for tboot optin
>    iommu/vt-d: Remove the 'force_on' variable
>    iommu/vt-d: Remove dmar_disabled
>    iommu/vt-d: Support the new DMA_REMAP_OPT_OUT flag bit
> 
>   drivers/iommu/intel/dmar.c  | 95 +++++++++++++++++++++++++++++++++----
>   drivers/iommu/intel/iommu.c | 78 +++++++++++++++---------------
>   drivers/iommu/intel/iommu.h | 64 ++++++++++++++++++++-----
>   drivers/iommu/intel/svm.c   |  2 +-
>   include/linux/dmar.h        |  1 +
>   5 files changed, 180 insertions(+), 60 deletions(-)

Patch series queued for v7.3-rc1. Thanks a lot, Kevin.