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

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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>
Cc: stable@vger.kernel.org
(cherry picked from commit 04a68a35ce)
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
This commit is contained in:
Chris Wilson 2016-11-09 10:39:05 +00:00 committed by Jani Nikula
parent aa9323dd49
commit ddd0937362
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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@ -405,6 +405,11 @@ 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");
return 0;
}
#ifdef CONFIG_INTEL_IOMMU
if (intel_iommu_gfx_mapped && INTEL_GEN(dev_priv) < 8) {
DRM_INFO("DMAR active, disabling use of stolen memory\n");