drm/i915/gvt: Fix GFX_MODE handling (888c0094) · Commits · 戴 / test

Enter failsafe if vgpu tries to change GFX_MODE controlled by host. Reviewed-by:

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

+14 −0

Original line number	Diff line number	Diff line
		@@ -1692,8 +1692,22 @@ static int ring_mode_mmio_write(struct intel_vgpu *vgpu, unsigned int offset,
		bool enable_execlist;
		int ret;

		((u32 )p_data) &= ~_MASKED_BIT_ENABLE(1);
		if (IS_COFFEELAKE(vgpu->gvt->dev_priv))
		((u32 )p_data) &= ~_MASKED_BIT_ENABLE(2);
		write_vreg(vgpu, offset, p_data, bytes);

		if (data & _MASKED_BIT_ENABLE(1)) {
		enter_failsafe_mode(vgpu, GVT_FAILSAFE_UNSUPPORTED_GUEST);
		return 0;
		}

		if (IS_COFFEELAKE(vgpu->gvt->dev_priv) &&
		data & _MASKED_BIT_ENABLE(2)) {
		enter_failsafe_mode(vgpu, GVT_FAILSAFE_UNSUPPORTED_GUEST);
		return 0;
		}

		/* when PPGTT mode enabled, we will check if guest has called
		* pvinfo, if not, we will treat this guest as non-gvtg-aware
		* guest, and stop emulating its cfg space, mmio, gtt, etc.