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Re: [Qemu-devel] [PATCH v6 0/4] Add support for TPM Physical Presence in

From: Stefan Berger
Subject: Re: [Qemu-devel] [PATCH v6 0/4] Add support for TPM Physical Presence interface
Date: Fri, 29 Jun 2018 08:20:38 -0400
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.8.0

On 06/28/2018 01:26 PM, Marc-André Lureau wrote:

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:


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.


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