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Message-ID: <a45c2e25aaa1f195e7fccff6114374994ffbc099.camel@intel.com> Date: Tue, 28 Nov 2023 01:31:14 +0000 From: "Edgecombe, Rick P" <rick.p.edgecombe@...el.com> To: "peterz@...radead.org" <peterz@...radead.org>, "Yang, Weijiang" <weijiang.yang@...el.com> CC: "Gao, Chao" <chao.gao@...el.com>, "Hansen, Dave" <dave.hansen@...el.com>, "seanjc@...gle.com" <seanjc@...gle.com>, "john.allen@....com" <john.allen@....com>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, "kvm@...r.kernel.org" <kvm@...r.kernel.org>, "pbonzini@...hat.com" <pbonzini@...hat.com>, "mlevitsk@...hat.com" <mlevitsk@...hat.com> Subject: Re: [PATCH v7 02/26] x86/fpu/xstate: Refine CET user xstate bit enabling 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? ibt=off sounds like it should be turning off the whole feature though. It doesn't sound like kernel IBT specifically.
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