Re: [RFC v2 15/18] guest memory protection: Decouple kvm_memcrypt_*() helpers from KVM

[David Gibson]

On Mon, Jun 01, 2020 at 09:13:01PM -0700, Richard Henderson wrote:
> On 5/20/20 8:43 PM, David Gibson wrote:
> > The kvm_memcrypt_enabled() and kvm_memcrypt_encrypt_data() helper functions
> > don't conceptually have any connection to KVM (although it's not possible
> > in practice to use them without it).
> 
> Yet?
> 
> I would expect TCG implementations of these interfaces eventually, for
> simulation of such hardware.  Or are we expecting *this* interface to be used
> only with kvm/any-other-hw-accel, as the nested guest inside of the outermost
> tcg qemu that's simulating hardware that supports...

Yes, this.  The whole point of this stuff is that the guest is
protected *from the hypervisor*, and therefore qemu can't expect to
access guest memory.  It's hard to imagine any way TCG could deal with
that.

An implementation for a non-KVM accelerator is entirely plausible, on
the other hand.

-- 
David Gibson                    | I'll have my music baroque, and my code
david AT gibson.dropbear.id.au  | minimalist, thank you.  NOT _the_ _other_
                                | _way_ _around_!
http://www.ozlabs.org/~dgibson

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