linux-kernel - Re: [PATCH v4 0/8] Introduce CET supervisor state support

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Message-ID: <Z-2vtnVhKZpKS9Gz@google.com>
Date: Wed, 2 Apr 2025 14:44:22 -0700
From: Sean Christopherson <seanjc@...gle.com>
To: Dave Hansen <dave.hansen@...el.com>
Cc: Rick P Edgecombe <rick.p.edgecombe@...el.com>, Chao Gao <chao.gao@...el.com>, 
	"x86@...nel.org" <x86@...nel.org>, 
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, "tglx@...utronix.de" <tglx@...utronix.de>, 
	"kvm@...r.kernel.org" <kvm@...r.kernel.org>, "pbonzini@...hat.com" <pbonzini@...hat.com>, 
	"ebiggers@...gle.com" <ebiggers@...gle.com>, "vigbalas@....com" <vigbalas@....com>, 
	"dave.hansen@...ux.intel.com" <dave.hansen@...ux.intel.com>, Chang Seok Bae <chang.seok.bae@...el.com>, 
	"levymitchell0@...il.com" <levymitchell0@...il.com>, 
	"samuel.holland@...ive.com" <samuel.holland@...ive.com>, Xin3 Li <xin3.li@...el.com>, 
	Weijiang Yang <weijiang.yang@...el.com>, "mingo@...hat.com" <mingo@...hat.com>, 
	"mlevitsk@...hat.com" <mlevitsk@...hat.com>, "john.allen@....com" <john.allen@....com>, 
	Stanislav Spassov <stanspas@...zon.de>, "attofari@...zon.de" <attofari@...zon.de>, 
	Rongqing Li <lirongqing@...du.com>, "hpa@...or.com" <hpa@...or.com>, 
	"peterz@...radead.org" <peterz@...radead.org>, 
	"aruna.ramakrishna@...cle.com" <aruna.ramakrishna@...cle.com>, "bp@...en8.de" <bp@...en8.de>, 
	Zhao1 Liu <zhao1.liu@...el.com>, "ubizjak@...il.com" <ubizjak@...il.com>
Subject: Re: [PATCH v4 0/8] Introduce CET supervisor state support

On Wed, Apr 02, 2025, Dave Hansen wrote:
> On 4/2/25 14:12, Edgecombe, Rick P wrote:
> > In any case, at this point I think we need to either double down on polishing
> > this thing up (by pausing other work) and have a clear “please do this with
> > these patches" request, or declare failure and argue for the smaller version.
> > 
> > I guess I still lean towards keeping the optimization. But I do think it's worth
> > considering at this point.
> 
> I'm not quite feeling the same sense of panic and some need to pause
> other work. This is thing is at v4. Between spring break and the merge
> window, v4 hasn't gotten many eyeballs, except Chang's (thanks Chang!).

This particular series is at v4, but KVM CET support was more or less ready to
roll 4 *years* ago.  I agree there's no need to panic, but some sense of urgency
would be nice.