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When using Linux >= 3.19 (commit 47591df) as dom0 on some Intel Ironlake devices, It is possible to encounter graphics issues that make screen unreadable or crash the system. It was reported in freedesktop bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=90037 As we still cannot find a proper fix for this problem, this patch adds iommu=igfx option to control whether Intel graphics IOMMU is enabled. Running Xen with iommu=no-igfx is similar to running Linux with intel_iommu=igfx_off, which disables IOMMU for Intel GPU. This can be used by users to manually workaround the problem before a fix is available for i915 driver. Signed-off-by: Ting-Wei Lan <lantw44@gmail.com> Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com> Release-acked-by: Wei Liu <wei.liu2@citrix.com> Acked-by: Kevin Tian <kevin.tian@intel.com>