> I don't confirm this.  I have Linux version 5.12.0-rc5+ installed and I
> see the attached in my binary_bios_measurements (I've run it through
> tpm2-eventlog so you can see the actual events).
Ok that is interesting.

Here are the steps to reproduce my findings.
Necessary tools: Build chain for edk2, swtpm 0.5.2 and qemu 5.2.0

1. Build OVMF from edk2-stable202102 with
-a X64 -a IA32 \
-b RELEASE \
-D NETWORK_IP6_ENABLE \
-D TPM_ENABLE \
-D FD_SIZE_4MB \
-D TLS_ENABLE \
-D HTTP_BOOT_ENABLE \
-D SECURE_BOOT_ENABLE \
-D SMM_REQUIRE \
-D EXCLUDE_SHELL_FROM_FD

2. Copy OVMF_CODE.fd and OVMF_VARS.fd into an empty directory
3. Download Ubuntu 21.04 desktop iso (which has a 5.11 Linux kernel) and 
copy it into that directory
(I can provide a custom Debian build with a patched and unpatched 
vanilla kernel if needed)
4. Create dir for swtpm: mkdir mytpm1
5. Start swtpm with
swtpm socket \
	--tpm2 \
	--tpmstate dir=mytpm1 \
	--ctrl type=unixio,path=mytpm1/swtpm-sock \
	--log level=4 &
6. Start qemu with
qemu-system-x86_64 \
         -enable-kvm \
         -machine q35,smm=on \
         -global driver=cfi.pflash01,property=secure,value=on \
         -drive if=pflash,format=raw,unit=0,file=OVMF_CODE.fd,readonly=on \
         -drive if=pflash,format=raw,unit=1,readonly=off,file=OVMF_VARS.fd \
         -chardev socket,id=chrtpm,path=mytpm1/swtpm-sock \
         -tpmdev emulator,id=tpm0,chardev=chrtpm \
         -device tpm-crb,tpmdev=tpm0 \
         -boot d \
         -cdrom "ubuntu-21.04-desktop-amd64.iso" \
         -m 3G \
         -vga virtio
7. Start Ubuntu normally and choose "Try Ubuntu"
8. Open a Terminal and check that
"/sys/kernel/security/tpm0/binary_bios_measurements" is empty

> On my OVMF boot I'm using the direct
> kernel command line and I have secure boot enabled but not activated,
> which is why you only see PCRs 0-7 in the log.

The Kernel here is loaded by Grub which itself is loaded by Shim. But 
that should not make a difference regarding the event log via ACPI right?

I've attached the event log from a Ubuntu 20.04 machine with a 5.12 
patched kernel and my kernel build config.

Best regards
Thore Sommer