iommu/vt-d: Set intel_iommu_gfx_mapped correctly

[ Upstream commit cf1ec4539a50bdfe688caad4615ca47646884316 ]

The intel_iommu_gfx_mapped flag is exported by the Intel
IOMMU driver to indicate whether an IOMMU is used for the
graphic device. In a virtualized IOMMU environment (e.g.
QEMU), an include-all IOMMU is used for graphic device.
This flag is found to be clear even the IOMMU is used.

Cc: Ashok Raj <ashok.raj@intel.com>
Cc: Jacob Pan <jacob.jun.pan@linux.intel.com>
Cc: Kevin Tian <kevin.tian@intel.com>
Reported-by: Zhenyu Wang <zhenyuw@linux.intel.com>
Fixes: c0771df8d5297 ("intel-iommu: Export a flag indicating that the IOMMU is used for iGFX.")
Suggested-by: Kevin Tian <kevin.tian@intel.com>
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/iommu/intel-iommu.c b/drivers/iommu/intel-iommu.c
index 603bf52..c143901 100644 (file)
--- a/drivers/iommu/intel-iommu.c
+++ b/drivers/iommu/intel-iommu.c
@@ -4033,9 +4033,7 @@ static void __init init_no_remapping_devices(void)
 
                /* This IOMMU has *only* gfx devices. Either bypass it or
                   set the gfx_mapped flag, as appropriate */
-               if (dmar_map_gfx) {
-                       intel_iommu_gfx_mapped = 1;
-               } else {
+               if (!dmar_map_gfx) {
                        drhd->ignored = 1;
                        for_each_active_dev_scope(drhd->devices,
                                                  drhd->devices_cnt, i, dev)
@@ -4831,6 +4829,9 @@ int __init intel_iommu_init(void)
                goto out_free_reserved_range;
        }
 
+       if (dmar_map_gfx)
+               intel_iommu_gfx_mapped = 1;
+
        init_no_remapping_devices();
 
        ret = init_dmars();