drm/i915/gvt: Stop initializing pvinfo through reading mmio

The region of pvinfo is reserved for communication between a VMM and
the GPU driver executing on a virtual machine. HW doesn't have any
backing mmio store support for the pvinfo region, thus accessing to
this range through MMIO read/write from host side is forbidden which
is regarded as unclaimed register access.

This patch leaves pvinfo range be initialized with zero.

Signed-off-by: Tina Zhang <tina.zhang@intel.com>
Reviewed-by: Zhenyu Wang <zhenyuw@linux.intel.com>
Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>

diff --git a/drivers/gpu/drm/i915/gvt/handlers.c b/drivers/gpu/drm/i915/gvt/handlers.c
index afd7f66bdc2d7f3503b5c64513834983baa5b739..bd12af3491235f9fc9190a8968c96cb7caf025fb 100644 (file)
--- a/drivers/gpu/drm/i915/gvt/handlers.c
+++ b/drivers/gpu/drm/i915/gvt/handlers.c
@@ -3420,6 +3420,10 @@ int intel_gvt_for_each_tracked_mmio(struct intel_gvt *gvt,
        }
 
        for (i = 0; i < gvt->mmio.num_mmio_block; i++, block++) {
+               /* pvinfo data doesn't come from hw mmio */
+               if (i915_mmio_reg_offset(block->offset) == VGT_PVINFO_PAGE)
+                       continue;
+
                for (j = 0; j < block->size; j += 4) {
                        ret = handler(gvt,
                                      i915_mmio_reg_offset(block->offset) + j,