Add AMD SEV-SNP vm support

[zhencliu]

[bssrikanth]

Hello @zhencliu , I wanted to give this a try. Is it a recent version which is pushed here in this draft or do you have any recent updates which you are yet to push into this draft which resolves conflicts with recent master?

[zhencliu]

Hello @zhencliu , I wanted to give this a try. Is it a recent version which is pushed here in this draft or do you have any recent updates which you are yet to push into this draft which resolves conflicts with recent master?

Hi, thanks for looking into this, this patch was not updated since I pushed it, it's out of date, the reason is SNP is not yet supported even in upstream, so we still don't have a final qemu command line which can be running a SNP VM, the options/params are TBD, talked with VT maintainers, we'll wait till the qemu upstream is ready.