[Qemu-devel] host hangs with pci-passthrough of SAS adapter

[Nishank Trivedi]

Hi,

I'm using QEMU (2.1.50) with Fedora 20 based host (3.15.6-200). While 
doing PCI-passthrough of PMC-Sierra 8001 SAS adapter, the *host* does a 
hard lockup even before guest kernel starts running. BIOS in use is 
SeaBIOS 1.7.5. Despite enabling various debugging options, I do not see 
any messages on the serial console.

The device is detached from host driver and bound to pci-stub, followed 
by this command -
  qemu-system-x86_64 guest.img --enable-kvm -smp 
14,sockets=2,cores=7,threads=1 -nographic -device pci-assign,host=b:d:f

This device works fine with host, similarly other devices I have work 
fine with guest through pci-pt. Any pointers to debug further will be 
greatly appreciated.

Thanks,
nt