Testing CPU features with Qemu

The Ceph erasure code plugin must run on Intel CPU that have no SSE4.2 support. A Qemu is run without SSE4.2 support:

qemu-system-x86_64 -machine accel=kvm:tcg -m 2048 \
  -drive file=server.img -boot c \
  -display sdl \
  -net nic -net user,hostfwd=tcp::2222-:22 \
  -fsdev local,security_model=passthrough,id=fsdev0,path=~/ceph \
  -device virtio-9p-pci,id=fs0,fsdev=fsdev0,mount_tag=hostshare

The qemu CPU has no SSE4.2 although the native CPU has it:

$ grep sse4.2 /proc/cpuinfo | wc -l
$ ssh -p 2222 loic@ grep sse4.2 /proc/cpuinfo | wc -l

The local development directory is a Plan 9 folder shared over Virtio mounted inside the VM:

sudo mount -t 9p -o trans=virtio,version=9p2000.L hostshare /home/loic/ceph

and the functional test is run to assert that encoding and decoding an object:

$ cd /home/loic/ceph/src
$ ./unittest_erasure_code_jerasure
[----------] Global test environment tear-down
[==========] 16 tests from 8 test cases ran. (30 ms total)
[  PASSED  ] 16 tests.