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How to troubleshoot broken ssh if you do GPU passthrough?
(sh.itjust.works)
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this post was submitted on 10 Dec 2024
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A rescue iso doesn't work if you have encrypted disk. I thought everybody encrypted disk nowadays.
This is an interesting idea though, as long as the other machine has a different GPU then the system shouldn't hijack it on startup.
AFAIK GPU passthrough is usually configured to detach the GPU from the host automatically on startup. So even if all VMs were broken, the GPU would still be detached. However as another commenter pointed out, it's possible to detach it manually which might be safer against accidental lockouts.
How's the disk encrypted? I've never heard of anyone setting up an encrypted drive such that you can't manually mount it with the password. It's possible but you'd have to go out of your way to do that and only encrypt the drive with a TPM-managed key. It's kind of a bad idea because if you lock yourself out your data's gone.
I was confused on how secure boot and disk encryption worked, ignore me 😅
😅 naa for me encryption a bigger risk than theft
That said, you should be able to decrypt your disks with the right key even on a live boot. Even if the secrets are in the tpm you should be able to use whatever your normal system uses to decrypt the disks.
If you don't enter a password to boot, the keys are available. If you do, the password can decrypt the keys afaik.
Again, I don't do this but that's what I've picked up here and there so take it with a grain of salt I may be wrong.
Actually that might work. I thought that secure boot and disk encryption would prevent mounting the disk to a different system, but now I can't think of any reason why it would. Good idea