• Tina Zhang's avatar
    drm/i915: Enable guest i915 full ppgtt functionality · 8a4ab66f
    Tina Zhang authored
    Enable the guest i915 full ppgtt functionality when host can provide this
    capability. vgt_caps is introduced to guest i915 driver to get the vgpu
    capabilities from the device model. VGT_CPAS_FULL_PPGTT is one of the
    capabilities type to let guest i915 dirver know that the guest i915 full
    ppgtt is supported by device model.
    
    Notice that the minor version of pvinfo isn't bumped because of this
    vgt_caps introduction, due to older guest would be broken by simply
    increasing the pvinfo version. Although the pvinfo minor version doesn't
    increase, the compatibility won't be blocked. The compatibility is ensured
    by checking the value of caps field in pvinfo. Zero means no full ppgtt
    support and BIT(2) means this feature is provided.
    
    Changes since v1:
    - Use u32 instead of uint32_t (Joonas)
    - Move VGT_CAPS_FULL_PPGTT introduction to this patch and use #define
      instead of enum (Joonas)
    - Rewrite the vgpu full ppgtt capability checking logic. (Joonas)
    - Some coding style refine. (Joonas)
    
    Changes since v2:
    - Divide the whole patch set into two separate patch series, with one
      patch in i915 side to check guest i915 full ppgtt capability and enable
      it when this capability is supported by the device model, and the other
      one in gvt side which fixs the blocking issue and enables the device
      model to provide the capability to guest. And this patch focuses on guest
      i915 side. (Joonas)
    - Change the title from "introduce vgt_caps to pvinfo" to
      "Enable guest i915 full ppgtt functionality". (Tina)
    
    Change since v3:
    - Add some comments about pvinfo caps and version. (Joonas)
    
    Change since v4:
    - Tested by Tina Zhang.
    
    Change since v5:
    - Add limitation about supporting 32bit full ppgtt.
    
    Change since v6:
    - Change the fallback to 48bit full ppgtt if i915.ppgtt_enable=2. (Zhenyu)
    
    Change in v9:
    - Remove the fixme comment due to no plan for 32bit full ppgtt
      support. (Zhenyu)
    - Reorder the patch-set to fix compiling issue with git-bisect. (Zhenyu)
    - Add print log when forcing guest 48bit full ppgtt. (Zhenyu)
    
    v10:
    - Update against Joonas's has_full_ppgtt and has_full_48bit_ppgtt disconnect
      change. (Zhenyu)
    
    Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com> # in v2
    Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
    Cc: Tina Zhang <tina.zhang@intel.com>
    Signed-off-by: default avatarTina Zhang <tina.zhang@intel.com>
    Signed-off-by: default avatarZhenyu Wang <zhenyuw@linux.intel.com>
    8a4ab66f
i915_pvinfo.h 3.37 KB