That is defined behavior in TCG PC Client Platform PM Profile (PTP) Specification
in Table 5 - PCR Initial and Reset Values
PCR0: 0000.....03, the ending "3" indicates locality.
From: tpm2 [mailto:email@example.com] On Behalf Of Scheie, Peter M
Sent: Friday, August 31, 2018 9:29 PM
Subject: [tpm2] In emulator, why do PCRs 17-22 default to ff?
In the emulator, PCRs 0-16 and 23 default to 00 when the emulator is started. But PCRs
17-22 default to ff. Why is that? Why not have them all be 00 or all be ff? (Actually,
I notice PCR0 is 03 upon startup; why is that?)