[vfio-users] issues about igd-passthrough using vfio-pci

[fulaiyang]

Hello，
    I have realized the IGD passthrough with Intel(R) Core(TM) i7-4770 CPU，but when I change the platform with the Intel Core i3-6100U，it doesn’t have any VGA output and windows7 refuses to boot with black screen. This problem has been bothering me for a long time,someone can help me?


dmesg:
Sep 12 14:04:39 ruijie-pc kernel: [254939.809585] DMAR: DRHD: handling fault status reg 2
Sep 12 14:04:39 ruijie-pc kernel: [254939.809592] DMAR: DMAR:[DMA Write] Request device [00:02.0] fault addr 0
Sep 12 14:04:39 ruijie-pc kernel: [254939.809592] DMAR:[fault reason 02] Present bit in context entry is clear
Sep 12 14:10:11 ruijie-pc kernel: [255272.523271] vfio-pci 0000:00:02.0: enabling device (0400 -> 0403)
Sep 12 14:10:11 ruijie-pc kernel: [255272.627404] vfio_ecap_init: 0000:00:02.0 hiding ecap 0x1b at 0x100
Sep 12 14:10:19 ruijie-pc kernel: [255280.602875] kvm: zapping shadow pages for mmio generation wraparound


My environment :
Intel Core i3-6100U @ 2.30GHz
Intel Corporation Sky Lake Integrated Graphics 
Ubuntu 16.04 LTS
Host kernel 4.6.6 x86_64 GNU/Linux
qemu 2.7.0
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