Unable to get GVT work with KVMGT

[Zhang, Xiong Y]

> Hi,
> 
> I'm trying to get KVMGT working with QEMU using a mainline kernel 4.14.x
> (+skl_dmc_ver1_26.bin) and QEMU 2.10 on an Intel i5-6440HQ (Thinkpad
> T460p). I successfully managed to create a virtual GPU via
> 
> $ echo 6761dcc1-4bc1-444c-bc1e-58f0d0d89e3a >
> /sys/bus/pci/devices/0000\:00\:02.0/mdev_supported_types/i915-GVTg_V5_
> 8/
> create
> 
> and the directory
> /sys/bus/mdev/devices/6761dcc1-4bc1-444c-bc1e-58f0d0d89e3a/ contains
> all files as expected (driver, intel_vgpu, iommu_group, mdev_type,
> ...) and /dev/vfio/11 appears.
> 
> However whenever I try to launch QEMU even with minimal parameters I get
> the following error:
> 
> $ qemu-system-x86_64 -bios /usr/share/seabios/bios.bin -m 2048 -device
> vfio-pci,sysfsdev=/sys/bus/mdev/devices/6761dcc1-4bc1-444c-bc1e-58f0d0d
> 89e3a/
[Zhang, Xiong Y] how about add -enable-kvm? And you have redundant '/' at the end of the line. 
vfio-pci,sysfsdev=/sys/bus/mdev/devices/6761dcc1-4bc1-444c-bc1e-58f0d0d89e3a
 
> qemu-system-x86_64: -device
> vfio-pci,sysfsdev=/sys/bus/mdev/devices/6761dcc1-4bc1-444c-bc1e-58f0d0d
> 89e3a/:
> vfio error: : failed to setup container for group 11: failed to set iommu for
> container: Input/output error
> 
> Did anybody encounter the same problem or can tell me what's wrong here?
> Is it a problem that I only have the integrated i915 graphics which is also used
> for the primary display (Xorg/KMS)? Here's my kernel config:
> 
> $ grep VFIO /boot/config-4.14.9+
> CONFIG_VFIO_IOMMU_TYPE1=y
> CONFIG_VFIO_VIRQFD=y
> CONFIG_VFIO=y
> # CONFIG_VFIO_NOIOMMU is not set
> CONFIG_VFIO_PCI=y
> # CONFIG_VFIO_PCI_VGA is not set
> CONFIG_VFIO_PCI_MMAP=y
> CONFIG_VFIO_PCI_INTX=y
> CONFIG_VFIO_PCI_IGD=y
> CONFIG_VFIO_MDEV=y
> CONFIG_VFIO_MDEV_DEVICE=y
> CONFIG_KVM_VFIO=y
> 
> $ grep KVM /boot/config-4.14.9+
> CONFIG_DRM_I915_GVT_KVMGT=y
> CONFIG_HAVE_KVM=y
> CONFIG_HAVE_KVM_IRQCHIP=y
> CONFIG_HAVE_KVM_IRQFD=y
> CONFIG_HAVE_KVM_IRQ_ROUTING=y
> CONFIG_HAVE_KVM_EVENTFD=y
> CONFIG_KVM_MMIO=y
> CONFIG_KVM_ASYNC_PF=y
> CONFIG_HAVE_KVM_MSI=y
> CONFIG_HAVE_KVM_CPU_RELAX_INTERCEPT=y
> CONFIG_KVM_VFIO=y
> CONFIG_KVM_GENERIC_DIRTYLOG_READ_PROTECT=y
> CONFIG_KVM_COMPAT=y
> CONFIG_HAVE_KVM_IRQ_BYPASS=y
> CONFIG_KVM=y
> CONFIG_KVM_INTEL=y
> # CONFIG_KVM_AMD is not set
> 
> $ grep I915 /boot/config-4.14.9+
> CONFIG_DRM_I915=y
> # CONFIG_DRM_I915_ALPHA_SUPPORT is not set #
> CONFIG_DRM_I915_CAPTURE_ERROR is not set
> CONFIG_DRM_I915_USERPTR=y CONFIG_DRM_I915_GVT=y
> CONFIG_DRM_I915_GVT_KVMGT=y CONFIG_SND_HDA_I915=y
> 
> Thank you and best regards
> 
> Tobias
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