<div dir="ltr"><div class="gmail_extra"><div class="gmail_quote">On Sun, Mar 12, 2017 at 1:35 PM, Patrick O'Callaghan <<a href="mailto:poc@usb.ve" target="_blank">poc@usb.ve</a>> wrote: <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">My only quibble is a spew of error messages in dmesg: # dmesg|grep DMAR [ 0.000000] ACPI: DMAR 0x00000000BD5B7800 0000B8 (v01 INTEL SNB 00000001 INTL 00000001) [ 0.000000] DMAR: IOMMU enabled [ 0.032824] DMAR: Host address width 36 [ 0.032825] DMAR: DRHD base: 0x000000fed90000 flags: 0x0 [ 0.032831] DMAR: dmar0: reg_base_addr fed90000 ver 1:0 cap c0000020e60262 ecap f0101a [ 0.032831] DMAR: DRHD base: 0x000000fed91000 flags: 0x1 [ 0.032834] DMAR: dmar1: reg_base_addr fed91000 ver 1:0 cap c9008020660262 ecap f0105a [ 0.032834] DMAR: RMRR base: 0x000000bd422000 end: 0x000000bd42ffff [ 0.032835] DMAR: RMRR base: 0x000000bf800000 end: 0x000000cf9fffff [ 0.032837] DMAR-IR: IOAPIC id 2 under DRHD base 0xfed91000 IOMMU 1 [ 0.032837] DMAR-IR: HPET id 0 under DRHD base 0xfed91000 [ 0.032838] DMAR-IR: Queued invalidation will be enabled to support x2apic and Intr-remapping. [ 0.033076] DMAR-IR: Enabled IRQ remapping in x2apic mode [ 0.720048] DMAR: No ATSR found [ 0.720497] DMAR: dmar0: Using Queued invalidation [ 0.720501] DMAR: dmar1: Using Queued invalidation [ 0.784439] DMAR: Software identity mapping for device 0000:00:00.0 [ 0.784440] DMAR: Software identity mapping for device 0000:00:01.0 [ 0.784444] DMAR: Software identity mapping for device 0000:00:02.0 [ 0.784445] DMAR: Software identity mapping for device 0000:00:14.0 [ 0.784445] DMAR: Software identity mapping for device 0000:00:16.0 [ 0.784446] DMAR: Software identity mapping for device 0000:00:1a.0 [ 0.784447] DMAR: Software identity mapping for device 0000:00:1b.0 [ 0.784448] DMAR: Software identity mapping for device 0000:00:1c.0 [ 0.784448] DMAR: Software identity mapping for device 0000:00:1c.1 [ 0.784449] DMAR: Software identity mapping for device 0000:00:1d.0 [ 0.784450] DMAR: Software identity mapping for device 0000:00:1f.0 [ 0.784451] DMAR: Software identity mapping for device 0000:00:1f.2 [ 0.784451] DMAR: Software identity mapping for device 0000:00:1f.3 [ 0.784455] DMAR: Software identity mapping for device 0000:01:00.0 [ 0.784456] DMAR: Software identity mapping for device 0000:01:00.1 [ 0.784460] DMAR: Software identity mapping for device 0000:03:00.0 [ 0.784461] DMAR: Setting RMRR: [ 0.784462] DMAR: Setting identity map for device 0000:00:02.0 [0xbf800000 - 0xcf9fffff] [ 0.785486] DMAR: Setting identity map for device 0000:00:14.0 [0xbd422000 - 0xbd42ffff] [ 0.785488] DMAR: Setting identity map for device 0000:00:1a.0 [0xbd422000 - 0xbd42ffff] [ 0.785489] DMAR: Setting identity map for device 0000:00:1d.0 [0xbd422000 - 0xbd42ffff] [ 0.785491] DMAR: Prepare 0-16MiB unity mapping for LPC [ 0.785491] DMAR: Setting identity map for device 0000:00:1f.0 [0x0 - 0xffffff] [ 0.785710] DMAR: Intel(R) Virtualization Technology for Directed I/O [ 0.866268] DMAR: 32bit 0000:00:1a.0 uses non-identity mapping [ 0.866294] DMAR: Setting identity map for device 0000:00:1a.0 [0xbd422000 - 0xbd42ffff] [ 0.877136] DMAR: 32bit 0000:00:1d.0 uses non-identity mapping [ 0.877162] DMAR: Setting identity map for device 0000:00:1d.0 [0xbd422000 - 0xbd42ffff] [ 1.602494] [drm] DMAR active, disabling use of stolen memory [ 1.622730] DMAR: DRHD: handling fault status reg 2 [ 1.622739] DMAR: [DMA Write] Request device [00:02.0] fault addr 7300000000 [fault reason 05] PTE Write access is not set [ 1.729748] DMAR: DRHD: handling fault status reg 2 [ 1.729756] DMAR: [DMA Write] Request device [00:02.0] fault addr 7300000000 [fault reason 05] PTE Write access is not set [ 1.940292] DMAR: DRHD: handling fault status reg 2 [ 1.940335] DMAR: [DMA Write] Request device [00:02.0] fault addr 7300000000 [fault reason 05] PTE Write access is not set [ 2.746359] DMAR: DRHD: handling fault status reg 2 [ 2.746389] DMAR: [DMA Write] Request device [00:02.0] fault addr 7300000000 [fault reason 05] PTE Write access is not set Not sure if that's a BIOS thing I need to look at or what. </blockquote><div> </div><div>Try changing from "intel_iommu=on" to "intel_iommu=on,igfx_off". You won't be able to assign the IGD to a VM by adding that, but that doesn't seem to be your goal anyway. </div></div></div></div>