drm/i915/gvt: use kmap instead of kmap_atomic around guest memory access
kmap_atomic doesn't allow sleep until unmapped. However, it's necessary to allow sleep during reading/writing guest memory, so use kmap instead. Signed-off-by: NBing Niu <bing.niu@intel.com> Signed-off-by: NXiaoguang Chen <xiaoguang.chen@intel.com> Signed-off-by: NJike Song <jike.song@intel.com> Signed-off-by: NZhenyu Wang <zhenyuw@linux.intel.com>
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