From 83faaf074e6d1ca4d1441aded0d3f01bce413479 Mon Sep 17 00:00:00 2001 From: Tina Zhang Date: Mon, 4 Nov 2019 13:31:48 +0800 Subject: [PATCH] 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 Reviewed-by: Zhenyu Wang Signed-off-by: Zhenyu Wang --- drivers/gpu/drm/i915/gvt/handlers.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/gpu/drm/i915/gvt/handlers.c b/drivers/gpu/drm/i915/gvt/handlers.c index afd7f66bdc2d..bd12af349123 100644 --- 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,