linux-kernel - RE: [PATCH 1/1] x86/hyperv: Disable IBT when hypercall page lacks ENDBR instruction

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Date:   Fri, 21 Jul 2023 14:21:42 +0000
From:   "Michael Kelley (LINUX)" <mikelley@...rosoft.com>
To:     David Laight <David.Laight@...LAB.COM>,
        Peter Zijlstra <peterz@...radead.org>
CC:     KY Srinivasan <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        "wei.liu@...nel.org" <wei.liu@...nel.org>,
        Dexuan Cui <decui@...rosoft.com>,
        "tglx@...utronix.de" <tglx@...utronix.de>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "bp@...en8.de" <bp@...en8.de>,
        "dave.hansen@...ux.intel.com" <dave.hansen@...ux.intel.com>,
        "hpa@...or.com" <hpa@...or.com>, "x86@...nel.org" <x86@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
Subject: RE: [PATCH 1/1] x86/hyperv: Disable IBT when hypercall page lacks
 ENDBR instruction

From: David Laight <David.Laight@...LAB.COM> Sent: Friday, July 21, 2023 7:07 AM
> 
> ...
> > I realized in the middle of the night that my reply was nonsense. :-(
> > pr_warn() makes the message visible when pr_info() might not.  I'm
> > happy to change to pr_warn().
> 
> PANIC_ON_WARN??
> 

panic_on_warn applies to WARN() and variants.  pr_warn() is unrelated;
it's just kernel logging level 4 vs. logging level 6 for pr_info().

Michael