Commit 83faaf07 authored Nov 04, 2019 by Tina Zhang Committed by Zhenyu Wang Nov 08, 2019

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>

parent d9dace94

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

+4 −0

Original line number	Original line	Diff line number	Diff line
	@@ -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++) {		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) {		for (j = 0; j < block->size; j += 4) {
	ret = handler(gvt,		ret = handler(gvt,
	i915_mmio_reg_offset(block->offset) + j,		i915_mmio_reg_offset(block->offset) + j,

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