[Intel-gfx] [PATCHi v2] drm/i915: Enhanced disable access to stolen memory as a guest

[Xiong Zhang]

commit "04a68a3 drm/i915/gvt: Disable access to stolen memory as a guest"
isn't enough in GVT-d which will pass through IGD to guest and don't run
vgt code. While intel_vgpu_active() is true only when vgt code run on
host and guest in GVT-g.

v2:GVT-g may run in non qemu (Zhenyu)

Signed-off-by: Xiong Zhang <xiong.y.zhang at intel.com>
---
 drivers/gpu/drm/i915/i915_drv.c        | 1 +
 drivers/gpu/drm/i915/i915_drv.h        | 1 +
 drivers/gpu/drm/i915/i915_gem_stolen.c | 4 ++--
 3 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index 03d9e45..8b807a9 100644
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -223,6 +223,7 @@ static void intel_detect_pch(struct drm_i915_private *dev_priv)
 					    PCI_SUBVENDOR_ID_REDHAT_QUMRANET &&
 				    pch->subsystem_device ==
 					    PCI_SUBDEVICE_ID_QEMU)) {
+				dev_priv->run_on_qemu = true;
 				dev_priv->pch_type =
 					intel_virt_detect_pch(dev_priv);
 			} else
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index a5947a4..ad95c87 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -2145,6 +2145,7 @@ struct drm_i915_private {
 	struct intel_uncore uncore;
 
 	struct i915_virtual_gpu vgpu;
+	bool run_on_qemu;
 
 	struct intel_gvt *gvt;
 
diff --git a/drivers/gpu/drm/i915/i915_gem_stolen.c b/drivers/gpu/drm/i915/i915_gem_stolen.c
index f3abdc2..6a011b0 100644
--- a/drivers/gpu/drm/i915/i915_gem_stolen.c
+++ b/drivers/gpu/drm/i915/i915_gem_stolen.c
@@ -409,8 +409,8 @@ int i915_gem_init_stolen(struct drm_i915_private *dev_priv)
 
 	mutex_init(&dev_priv->mm.stolen_lock);
 
-	if (intel_vgpu_active(dev_priv)) {
-		DRM_INFO("iGVT-g active, disabling use of stolen memory\n");
+	if (dev_priv->run_on_qemu || intel_vgpu_active(dev_priv)) {
+		DRM_INFO("Running in guest, disabling use of stolen memory\n");
 		return 0;
 	}
 
-- 
1.9.1