Why research when you can type a one-liner?
"there is no way you can be sure that Windows 7's XP Mode is supported unless you research Intel's CPU web pages or the manufacturer specifically says so."
Well, you could fire up a terminal in your linux distro and enter the following:
if [ `grep -c vmx /proc/cpuinfo` -ge 0 ]; then echo Supports Intel VT; else echo No Support for Intel VT; fi
Which will give you the answer you are looking for.
Then again if you were running a linux distro you wouldn't be looking at Windows 7...