[Bug 1851664] Re: qemu-system-x86_64: "VFIO_MAP_DMA : -28" error when we attache 6 VF's to guest machine

[IndrasenaReddy Gali]

qemu-system-x86_64 -name guest=fedora24 -machine 
q35,accel=kvm,kernel-irqchip=split \
        -enable-kvm \
        -m 4G \
        -smp 8,sockets=1,cores=8,threads=1 \
        -device intel-iommu,intremap=on,caching-mode=on,aw-bits=48  \
        -drive file=<OS_IMAGE_FILE>,format=raw \
        -device ioh3420,id=pcie.1,chassis=1 \
        -device 
virtio-net-pci,bus=pcie.1,disable-legacy=on,disable-modern=off,iommu_platform=on,ats=on,netdev=net0
 \
        -netdev user,id=net0,hostfwd=tcp::1111-:22\
        -device vfio-pci,host=3f:02.1  \
                -device vfio-pci,host=3f:02.2  \
                -device vfio-pci,host=3f:02.3 \
                -device vfio-pci,host=3f:02.4 \
        -device vfio-pci,host=3d:02.4 \
                -device vfio-pci,host=3d:02.5 \
                -device vfio-pci,host=3d:02.6 \
        -nographic

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https://bugs.launchpad.net/bugs/1851664

Title:
  qemu-system-x86_64: "VFIO_MAP_DMA : -28" error when we attache 6 VF's
  to guest machine

Status in QEMU:
  Incomplete

Bug description:
  We are trying to attach 6 VF's to the guest machine on 4.1.1 qemu emulator.
  We are observing "VFIO_MAP_DMA : -28" error.

  We are using w-bits=48 bits while lunching VM.

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