On 06/28/2018 01:26 PM, Marc-André Lureau wrote:
Hi,
The following patches implement the TPM Physical Presence Interface
that allows a user to set a command via ACPI (sysfs entry in Linux)
that, upon the next reboot, the firmware looks for and acts upon by
sending sequences of commands to the TPM.
A dedicated memory region is added to the TPM CRB & TIS devices, at
address/size 0xFED45000/0x400. A new "etc/tpm/config" fw_cfg entry
holds the location for that PPI region and some version details, to
allow for future flexibility.
With the associated edk2/ovmf firmware, the Windows HLK "PPI 1.3" test
now runs successfully.
It is based on previous work from Stefan Berger ("[PATCH v2 0/4]
Implement Physical Presence interface for TPM 1.2 and 2")
The edk2 support is merged upstream.
The least I could do now is test this... So, I tested this now with the
SeaBIOS support I have for this series. It's here:
https://github.com/stefanberger/seabios-tpm/tree/qemu-ppi.v6
It works fine with at least an attached TPM 1.2. I haven't tried TPM 2
yet but would not expect complications from QEMU level. A operation
request value put into Linux's PPI interface can be read back also after
a VM suspend / resume operation. The list of supported operations is
shown correctly (needs Linux extensions for TPM 2 operation values
beyond a certain number iirc). The request operation is executed
correctly and the response shows the last operation and its result. So
it seems to work fine.
Stefan