[Bug 217796] latest Zen Inception fixes breaks nested kvm virtualization on AMD

[bugzilla-daemon@kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=217796

--- Comment #3 from sonst+kernel@o-oberst.de ---
Sean,

it does sound ridiculous, but it isn't. I tested the fix you suggested and it
works now with that patch applied. In the meantime i switched to a differnet
machine to be able to test your fix and there I could also confirm the problem
there on a 6.4.11 kernel: 

Test machine setup: 

Gentoo, (vanilla) Kernel 6.4.11

Without the patch and spec_rstack_overflow in the default meaning
pec_rstack_overflow=safe-ret also on this system my nested VMs do not start and
get OOM-killed.

I then applied the patch from your link, Sean, and it works now.

Cheers,

Oliver

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