Re: [Qemu-devel] [RFC PATCH 0/2] spapr: Implement H_TPM_COMM for accessing host TPM device

[David Gibson]

On Thu, Jul 11, 2019 at 08:19:32PM -0500, Michael Roth wrote:
> These patches are also available at:
> 
>   https://github.com/mdroth/qemu/commits/spapr-tpm-hcall-v0
> 
> This patchset implements the H_TPM_COMM hypercall, which provides a way
> for an Ultravisor to pass raw TPM commands on to a host's TPM device,
> either directly or through a TPM Resource Manager (needed to support
> multiple guests).
> 
> Secure Guests running on an Ultravisor have a symmetric key that is
> encrypted using a public key that is bound to a trusted host's TPM
> hardware. This hypercall provides a means to decrypt the symmetric
> key on behalf of a Secure Guest using the host's TPM hardware.
> 
> More details are provided in the spec summary introduced in patch 1.

This is obviously 4.2 material, other comments on the individual patches.

> 
>  docs/specs/ppc-spapr-uv-hcalls.txt |  74 
> ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
>  hw/ppc/Makefile.objs               |   1 +
>  hw/ppc/spapr.c                     |  27 +++++++++++++++++++++++++++
>  hw/ppc/spapr_hcall_tpm.c           | 135 
> +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
>  hw/ppc/trace-events                |   4 ++++
>  include/hw/ppc/spapr.h             |   7 ++++++-
>  6 files changed, 247 insertions(+), 1 deletion(-)
> 
> 

-- 
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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