drm/i915/gvt: add full vGPU reset support
Full vGPU reset need to release all the shadow PPGGT pages to avoid unnecessary write-protect and also should re-initialize pvinfo after resetting vregs to keep pvinfo correct. Signed-off-by: NPing Gao <ping.a.gao@intel.com> Signed-off-by: NZhenyu Wang <zhenyuw@linux.intel.com>
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