• Lu Baolu's avatar
    iommu/vt-d: Leave scalable mode default off · 8950dcd8
    Lu Baolu authored
    Commit 765b6a98 ("iommu/vt-d: Enumerate the scalable
    mode capability") enables VT-d scalable mode if hardware
    advertises the capability. As we will bring up different
    features and use cases to upstream in different patch
    series, it will leave some intermediate kernel versions
    which support partial features. Hence, end user might run
    into problems when they use such kernels on bare metals
    or virtualization environments.
    
    This leaves scalable mode default off and end users could
    turn it on with "intel-iommu=sm_on" only when they have
    clear ideas about which scalable features are supported
    in the kernel.
    
    Cc: Liu Yi L <yi.l.liu@intel.com>
    Cc: Jacob Pan <jacob.jun.pan@linux.intel.com>
    Suggested-by: default avatarAshok Raj <ashok.raj@intel.com>
    Suggested-by: default avatarKevin Tian <kevin.tian@intel.com>
    Signed-off-by: default avatarLu Baolu <baolu.lu@linux.intel.com>
    Signed-off-by: default avatarJoerg Roedel <jroedel@suse.de>
    8950dcd8
intel-iommu.c 137 KB