Hi Alex, I got a dell x86 machine with Intel(R) Core(TM) i7-2600 CPU @ 3.40GHz and I am passing one of two EHCI hosts - 00:1a.0 - to a guest, and at first it worked but now it would not start the guest at all and all I see in dmesg related to the thing is: [ 338.331640] vfio-pci 0000:00:1a.0: enabling device (0000 -> 0002) [ 338.433717] vfio_cap_init: 0000:00:1a.0 hiding cap 0xa [ 352.296443] perf: interrupt took too long (8678 > 8277), lowering kernel.perf_event_max_sample_rate to 23000 [ 381.438215] perf: interrupt took too long (11304 > 10847), lowering kernel.perf_event_max_sample_rate to 17000 [ 417.441806] DMAR: DRHD: handling fault status reg 3 [ 417.441813] DMAR: [DMA Read] Request device [00:1a.0] fault addr eb000 [fault reason 06] PTE Read access is not set Does this look any familiar? Thanks. 00:00.0 Host bridge: Intel Corporation 2nd Generation Core Processor Family DRAM Controller (rev 09) 00:02.0 VGA compatible controller: Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller (rev 09) 00:16.0 Communication controller: Intel Corporation 6 Series/C200 Series Chipset Family MEI Controller #1 (rev 04) 00:16.3 Serial controller: Intel Corporation 6 Series/C200 Series Chipset Family KT Controller (rev 04) 00:19.0 Ethernet controller: Intel Corporation 82579LM Gigabit Network Connection (Lewisville) (rev 04) 00:1a.0 USB controller: Intel Corporation 6 Series/C200 Series Chipset Family USB Enhanced Host Controller #2 (rev 04) 00:1b.0 Audio device: Intel Corporation 6 Series/C200 Series Chipset Family High Definition Audio Controller (rev 04) 00:1c.0 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset Family PCI Express Root Port 1 (rev b4) 00:1c.2 PCI bridge: Intel Corporation 6 Series/C200 Series Chipset Family PCI Express Root Port 3 (rev b4) 00:1d.0 USB controller: Intel Corporation 6 Series/C200 Series Chipset Family USB Enhanced Host Controller #1 (rev 04) 00:1e.0 PCI bridge: Intel Corporation 82801 PCI Bridge (rev a4) 00:1f.0 ISA bridge: Intel Corporation Q67 Express Chipset Family LPC Controller (rev 04) 00:1f.2 SATA controller: Intel Corporation 6 Series/C200 Series Chipset Family 6 port Desktop SATA AHCI Controller (rev 04) 00:1f.3 SMBus: Intel Corporation 6 Series/C200 Series Chipset Family SMBus Controller (rev 04) -- Alexey
