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

[Michael Roth]

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.

 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(-)