Re: [Qemu-devel] [QEMU PATCH v2 0/2]: KVM: i386: Add support for save and restore nested state

[Paolo Bonzini]

On 08/11/2018 01:45, Jim Mattson wrote:
> I have no attachments to the current design. I had used a data[] blob,
> because I didn't think userspace would have any need to know what was
> in there. However, I am now seeing the error of my ways. For example,
> the userspace instruction emulator needs to know the contents of the
> vmcs12 to emulate instructions when in guest mode.

Yeah, we're probably going to have to document the KVM vmcs12 structure,
possibly moving it to uapi.  But that's a different thing from
save/restore state, which can use the 4K or 8K data[] blob.

Paolo