[Qemu-devel] [Bug 1585971] [NEW] Host system crashes on qemu with DMA remapping

[TuniTunes]

Public bug reported:

Hy,

the host system crashes completely, when i try to pass an physical
device without boot option intel_iommu=on set. In older kernel versions
you didn't have to pass that option.

I wonder if this can be easily checked by asking iommu state, avoiding a
crash of the complete system.

My data:
cpu model: Intel(R) Core(TM) i7 CPU
qemu version: 2.4.1-r2
kernel version: 4.1.2 x86_64
command line: 
qemu-system-x86_64 -enable-kvm -drive 
file=/vms/prod/fw/fw.iso,if=virtio,format=raw -drive 
file=/vms/prod/fw/swap,if=virtio,format=raw -drive 
file=/vms/prod/fw/fwdata.iso,if=virtio,format=raw -m 512 -nographic -kernel 
/data/kernels/vmlinuz-2.6.36-gentoo-r8 -append "root=/dev/vda console=ttyS0 
earlyprintk=serial" -net nic,model=virtio,macaddr=DE:AD:BE:EF:2D:AD -net 
tap,ifname=tapfw0,script=/etc/qemu/qemu-ifup -device pci-assign,host=03:00.0

There are also more detailed informations (if needed) here:
https://forums.gentoo.org/viewtopic-p-7923976.html

Thanks,
Antonios.

** Affects: qemu
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1585971

Title:
  Host system crashes on qemu with DMA remapping

Status in QEMU:
  New

Bug description:
  Hy,

  the host system crashes completely, when i try to pass an physical
  device without boot option intel_iommu=on set. In older kernel
  versions you didn't have to pass that option.

  I wonder if this can be easily checked by asking iommu state, avoiding
  a crash of the complete system.

  My data:
  cpu model: Intel(R) Core(TM) i7 CPU
  qemu version: 2.4.1-r2
  kernel version: 4.1.2 x86_64
  command line: 
  qemu-system-x86_64 -enable-kvm -drive 
file=/vms/prod/fw/fw.iso,if=virtio,format=raw -drive 
file=/vms/prod/fw/swap,if=virtio,format=raw -drive 
file=/vms/prod/fw/fwdata.iso,if=virtio,format=raw -m 512 -nographic -kernel 
/data/kernels/vmlinuz-2.6.36-gentoo-r8 -append "root=/dev/vda console=ttyS0 
earlyprintk=serial" -net nic,model=virtio,macaddr=DE:AD:BE:EF:2D:AD -net 
tap,ifname=tapfw0,script=/etc/qemu/qemu-ifup -device pci-assign,host=03:00.0

  There are also more detailed informations (if needed) here:
  https://forums.gentoo.org/viewtopic-p-7923976.html

  Thanks,
  Antonios.

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