drm/i915/gvt: Map shadow page before using it in shadow page table

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MFN usually refers to "Machine Frame Number" in virtulization world.
Currently GVT-g populates the shadow PPGTT/GGTT page table with MFN
according to the translation between MFN and Guest PFN.

When host IOMMU is enabled, GPU DMA transactions go through the IOMMU,
GPU needs an IOVA<->MFN mapping to walk the shadow page table in host
main memory.

This patch will map a page in IOMMU page table before using it in shadow
page table and release the map when a shadow page is going to be freed.

Signed-off-by: Zhi Wang <zhi.a.wang@intel.com>
Signed-off-by: Chuanxiao Dong <chuanxiao.dong@intel.com>
Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>

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Chuanxiao Dong 2017-02-09 11:37:11 +08:00 • committed by Zhenyu Wang

parent b15b2a612d

commit 5de6bd4c23

1 changed files with 50 additions and 20 deletions

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drivers/gpu/drm/i915/gvt/gtt.c

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