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tpm2-setup-early: order against pcrphase-initrd

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Right now systemd-tpm2-setup-early and systemd-pcrphase-initrd.service
are not ordered against each other. However, they require the same slow
resource to operate: the TPM2. If we allow them to access the device
simultaneously, the kernel resource manager like has to save/restore TPM
state while they operate, slowing things down further.

hence, let's avoid all this mess, and just order them against each other
so that the shared resource is first used in full by one and then by the
other.

I opted to order systemd-pcrphase-initrd before
systemd-tpm2-setup-early, since there's value in having the former as
early as possible in userspace, to be a good marker for the transition
from kernel to first userspace. I can see no benefit in the opposite
order however.
This commit is contained in:
Lennart Poettering 2024-04-22 14:47:58 +02:00
parent f64222b748
commit a6e9c37f5e
1 changed files with 1 additions and 1 deletions
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units/systemd-tpm2-setup-early.service.in
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@ -12,10 +12,10 @@ Description=Early TPM SRK Setup
Documentation=man:systemd-tpm2-setup.service(8)
DefaultDependencies=no
Conflicts=shutdown.target
After=tpm2.target systemd-pcrphase-initrd.service
Before=sysinit.target shutdown.target
ConditionSecurity=measured-uki
ConditionPathExists=!/run/systemd/tpm2-srk-public-key.pem
After=tpm2.target
[Service]
Type=oneshot