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drm/i915/gvt: Disable access to stolen memory as a guest

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commit ddd0937362 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>
(cherry picked from commit 04a68a35ce)
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Chris Wilson
2016-11-09 10:39:05 +00:00
committed by Greg Kroah-Hartman
parent f72b751f43
commit 868a747c77
1 changed files with 5 additions and 0 deletions
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5
drivers/gpu/drm/i915/i915_gem_stolen.c
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@ -415,6 +415,11 @@ int i915_gem_init_stolen(struct drm_device *dev)
mutex_init(&dev_priv->mm.stolen_lock);
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");