On Tue, Nov 28, 2023 at 01:31:14AM +0000, Edgecombe, Rick P wrote: > On Fri, 2023-11-24 at 10:40 +0100, Peter Zijlstra wrote: > > So booting a host with "ibt=off" will clear the FEATURE_IBT, this was > > fine before this patch-set, but possibly not with. > > > > That kernel argument really only wants to tell the kernel not to use > > IBT > > itself, but not inhibit IBT from being used by guests. > > Should we add a SW bit for it then? Don't think we need a feature flag for this, some boolean state should be enough. > ibt=off sounds like it should be > turning off the whole feature though. It doesn't sound like kernel IBT > specifically. Well, the intent really was to just not enable IBT, clearing the feature was the simplest way to make that happen.
