Commit 5daab580 authored by Lu Baolu's avatar Lu Baolu Committed by Joerg Roedel

iommu/vt-d: Make kernel parameter igfx_off work with vIOMMU

The kernel parameter igfx_off is used by users to disable
DMA remapping for the Intel integrated graphic device. It
was designed for bare metal cases where a dedicated IOMMU
is used for graphic. This doesn't apply to virtual IOMMU
case where an include-all IOMMU is used.  This makes the
kernel parameter work with virtual IOMMU as well.

Cc: Ashok Raj <ashok.raj@intel.com>
Cc: Jacob Pan <jacob.jun.pan@linux.intel.com>
Suggested-by: default avatarKevin Tian <kevin.tian@intel.com>
Fixes: c0771df8 ("intel-iommu: Export a flag indicating that the IOMMU is used for iGFX.")
Signed-off-by: default avatarLu Baolu <baolu.lu@linux.intel.com>
Tested-by: default avatarZhenyu Wang <zhenyuw@linux.intel.com>
Signed-off-by: default avatarJoerg Roedel <jroedel@suse.de>
parent cf1ec453
...@@ -3415,9 +3415,12 @@ static int __init init_dmars(void) ...@@ -3415,9 +3415,12 @@ static int __init init_dmars(void)
iommu_identity_mapping |= IDENTMAP_ALL; iommu_identity_mapping |= IDENTMAP_ALL;
#ifdef CONFIG_INTEL_IOMMU_BROKEN_GFX_WA #ifdef CONFIG_INTEL_IOMMU_BROKEN_GFX_WA
iommu_identity_mapping |= IDENTMAP_GFX; dmar_map_gfx = 0;
#endif #endif
if (!dmar_map_gfx)
iommu_identity_mapping |= IDENTMAP_GFX;
check_tylersburg_isoch(); check_tylersburg_isoch();
if (iommu_identity_mapping) { if (iommu_identity_mapping) {
......
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