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I install the latest Ubuntu 14.04 amd64(gcc 4.8.2) in virtualbox, run cat /proc/cpuinfo, get result:
The processor CORE i52520M does support AVX instructions. I used Ubuntu 12.04 amd64(gcc 4.6), and it supports AVX via /proc/cpuinfo.
How can I use the AVX in my software in virtualbox?
VirtualBox 5.0 beta 3 now supports AVX and AVX2 (which I can confirm from testing).