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GEM proxy is a kind of GEM, whose backing physical memory is pinned and produced by guest VM and is used by host as read only. With GEM proxy, host is able to access guest physical memory through GEM object interface. As GEM proxy is such a special kind of GEM, a new flag I915_GEM_OBJECT_IS_PROXY is introduced to ban host from changing the backing storage of GEM proxy. v3: - update "Reviewed-by". (Joonas) v2: - return -ENXIO when pin and map pages of GEM proxy to kernel space. (Chris) Here are the histories of this patch in "Dma-buf support for Gvt-g" patch-set: v14: - return -ENXIO when gem proxy object is banned by ioctl. (Chris) (Daniel) v13: - add comments to GEM proxy. (Chris) - don't ban GEM proxy in i915_gem_sw_finish_ioctl. (Chris) - check GEM proxy bar after finishing i915_gem_object_wait. (Chris) - remove GEM proxy bar in i915_gem_madvise_ioctl. v6: - add gem proxy barrier in the following ioctls. (Chris) i915_gem_set_caching_ioctl i915_gem_set_domain_ioctl i915_gem_sw_finish_ioctl i915_gem_set_tiling_ioctl i915_gem_madvise_ioctl Signed-off-by: Tina Zhang <tina.zhang@intel.com> Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com> #v1 Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Daniel Vetter <daniel.vetter@ffwll.ch> Link: https://patchwork.freedesktop.org/patch/msgid/1510555798-21079-2-git-send-email-tina.zhang@intel.com Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Link: https://patchwork.freedesktop.org/patch/msgid/20171114102513.22269-2-chris@chris-wilson.co.uk
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.