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In bug 1734505, a customer is trying to passthrough a TPM 1.2 device and enabling windows bitlocker with UEFI.

Under some limited context, it is possible to passthrough a TPM 1.2 device and enabling windows bitlocker with seabios. (When seabios detects a passthrough TPM, it doesn't extend any PCR)

Currently, ovmf supports vTPM 2.0 only.

Adding support for TPM 1.2 seems quite straightforward. I removed PCR extension altogether for now. Bitlocker seems quite happy about the result, although I lack a host with IMA/grub meansurements to confirm this is enough.

See attached patch

Created attachment 1622293 [details]
ovmf tpm1 patch

Related upstream patches, posted by Marc-André:

[edk2-devel] [PATCH v2 0/3] Ovmf: enable TPM 1.2
http://mid.mail-archive.com/20200213131222.157700-1-marcandre.lureau@redhat.com
https://edk2.groups.io/g/devel/message/54362

Further iterations:

[edk2-devel] [PATCH v3 0/6] Ovmf: enable TPM 1.2
https://edk2.groups.io/g/devel/message/54854
http://mid.mail-archive.com/20200226093459.1131530-1-marcandre.lureau@redhat.com

[edk2-devel] [PATCH v4 0/5] Ovmf: enable TPM 1.2
https://edk2.groups.io/g/devel/message/54894
http://mid.mail-archive.com/20200226152433.1295789-1-marcandre.lureau@redhat.com

V4 is ready to go in, with Simon Hardy's T-b, once edk2-stable202002 is tagged and the hard feature freeze ends (expected on March 4th).

Upstream v4 has been merged as commit range ecb30848fdc9..61d3b2d4279e, via <https://github.com/tianocore/edk2/pull/416/>.

Verified on RHEL 8.3

kernel: 4.18.0-215.el8.x86_64
qemu-kvm: qemu-kvm-4.2.0-19.module+el8.3.0+6473+93e27135.x86_64
edk: edk2-ovmf-20200602gitca407c7246bf-1.el8.noarch

Verified with windows 2019 guest:
passthrough test: pass
Run bitlocker app: BZ 1734505

Verified with linux rhel 8.3 guest: 
passthrough test: pass