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[Bug 1716132] Re: Win 10 bitlocker won't initialise pass-through TPM
From: |
Thomas Huth |
Subject: |
[Bug 1716132] Re: Win 10 bitlocker won't initialise pass-through TPM |
Date: |
Mon, 09 Nov 2020 18:32:10 -0000 |
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If you still think this bug report here is valid, then please switch the state
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** Changed in: qemu
Status: New => Incomplete
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https://bugs.launchpad.net/bugs/1716132
Title:
Win 10 bitlocker won't initialise pass-through TPM
Status in QEMU:
Incomplete
Bug description:
All stock Ubuntu Zesty, Win10Pro KVM guest configured with OVMF and
Q35. My host has an ASRock Z97 Extreme 6 board with a TPM header
which is populated with v1.2 complaint device.
Testing in my host the TPM device is function, I can tpm_takeownership
and tpm_clear successfully and similar testing by passing the device
through to a linux guest also succeeds.
However using Bitlocker in Windows 10 Pro release 1703 Windows advises
it cannot "Prepare" the device which I take to mean it cannot take
ownership of it. I believe this to be related to Windows inability to
view the TCG Event Log which is evidenced in the below 2 screencaps,
however I'm no expert.
https://s26.postimg.org/vter35eh5/Screenshot_20170907_114644.png
https://s26.postimg.org/klo854qyx/Screenshot_20170909_143841.png
I've also tested the scenario with qemu 2.10 which provided the exact
same results. The only difference in the test setup is that I had to
make the guest boot with SeaBios instead of OVMF. (Windows wouldn't
boot with OVMF with the boot manager giving me an error pointing to a
BCD issue. Researching this it seemed related to an old ACPI problem,
I believe this unrelated to my TPM issue so will do more research and
raise a separate bug for this if needed.)
Happy to provide further configurations and build logs as necessary so
please advise me what is needed.
Lastly for background reading. I've been trying to get TPM
passthrough working with Windows for a long time now and have hit
several different issues which I believe have been addressed by both
code maturity in Qemu but also in Windows releases. An earlier bug
report can be found here
(https://bugs.launchpad.net/ubuntu/+source/qemu/+bug/1615722) which
concludes advising me to raise this new/separate issue.
Thanks in advance,
Kelvin
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