SPEC-CTRL what is it?

speedbird

Member
Nov 3, 2017
45
5
13
As the title says,
there is this new flag which one can activate but what does it do and should I enable it?

Thanks!
 

fabian

Proxmox Staff Member
Staff member
Jan 7, 2016
6,694
1,169
164
the pve-docs package has not yet been bumped and pushed to the repositories, but contains some information:
https://git.proxmox.com/?p=pve-docs...72ae8aa21ec6fa97313ce4a5d1e2e8089e106484#l307

if you have a guest that uses IBRS/IBPB CPU features (e.g., patched Windows, RHEL, SLES) AND a CPU which got support for it via a microcode/BIOS update (on all nodes where you want to potentially run this guest), you can pass through the support to the guest kernel so that it can use the feature.
 

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