[PATCH 4.9 164/164] drm/i915/gvt: Disable access to stolen memory as a guest

From	Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Newsgroups	linux.kernel
Subject	[PATCH 4.9 164/164] drm/i915/gvt: Disable access to stolen memory as a guest
Date	2017-05-23 23:00 +0200
Message-ID	<tKp4m-7w-11@gated-at.bofh.it> (permalink)
References	<tKoBk-8ko-9@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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4.9-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Chris Wilson <chris@chris-wilson.co.uk>

commit 04a68a35ce6d7b54749989f943993020f48fed62 upstream.

Explicitly disable stolen memory when running as a guest in a virtual
machine, since the memory is not mediated between clients and reserved
entirely for the host. The actual size should be reported as zero, but
like every other quirk we want to tell the user what is happening.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=99028
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Zhenyu Wang <zhenyuw@linux.intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20161109103905.17860-1-chris@chris-wilson.co.uk
Reviewed-by: Zhenyu Wang <zhenyuw@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/gpu/drm/i915/i915_gem_stolen.c |    5 +++++
 1 file changed, 5 insertions(+)

--- a/drivers/gpu/drm/i915/i915_gem_stolen.c
+++ b/drivers/gpu/drm/i915/i915_gem_stolen.c
@@ -420,6 +420,11 @@ int i915_gem_init_stolen(struct drm_devi
 		return 0;
 	}
 
+	if (intel_vgpu_active(dev_priv)) {
+		DRM_INFO("iGVT-g active, disabling use of stolen memory\n");
+		return 0;
+	}
+
 #ifdef CONFIG_INTEL_IOMMU
 	if (intel_iommu_gfx_mapped && INTEL_INFO(dev)->gen < 8) {
 		DRM_INFO("DMAR active, disabling use of stolen memory\n");

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[PATCH 4.9 164/164] drm/i915/gvt: Disable access to stolen memory as a guest Greg Kroah-Hartman <gregkh@linuxfoundation.org> - 2017-05-23 23:00 +0200

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