radare2 is now capable to decompile the following "instructions"
0F C6 28 01 00 vmcpuid
0F C6 28 00 00 vmgetinfo
0F C6 28 00 01 vmsetinfo
0F C6 28 00 02 vmdxdsbl
0F C6 28 00 03 vmdxenbl
0F C6 28 01 00 vmcpuid
0F C6 28 01 01 vmhlt
0F C6 28 01 02 vmsplaf
0F C6 28 02 00 vmpushfd
0F C6 28 02 01 vmpopfd
0F C6 28 02 02 vmcli
0F C6 28 02 03 vmsti
0F C6 28 02 04 vmiretd
0F C6 28 03 00 vmsgdt
0F C6 28 03 01 vmsidt
0F C6 28 03 02 vmsldt
0F C6 28 03 03 vmstr
0F C6 28 04 00 vmsdte
0F 3F 01 XX vpcext 01h XXh
0F 3F 05 XX vpcext 05h XXh
0F 3F 07 XX vpcext 07h XXh
0F 3F 0D XX vpcext 0Dh XXh
0F 3F 10 XX vpcext 10h XXh
You can see the commit here
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