linux-kernel - Re: [RFC PATCH 22/32] x86/fred: FRED initialization code

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Message-ID: <77C92705-B15D-4680-8587-CAEB48BEDDA1@zytor.com>
Date:   Fri, 23 Dec 2022 11:30:58 -0800
From:   "H. Peter Anvin" <hpa@...or.com>
To:     Peter Zijlstra <peterz@...radead.org>
CC:     "Li, Xin3" <xin3.li@...el.com>,
        "andrew.cooper3@...rix.com" <andrew.cooper3@...rix.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "x86@...nel.org" <x86@...nel.org>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "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>,
        "Christopherson,, Sean" <seanjc@...gle.com>,
        "pbonzini@...hat.com" <pbonzini@...hat.com>,
        "Shankar, Ravi V" <ravi.v.shankar@...el.com>
Subject: Re: [RFC PATCH 22/32] x86/fred: FRED initialization code

On December 22, 2022 5:09:28 AM PST, Peter Zijlstra <peterz@...radead.org> wrote:
>On Tue, Dec 20, 2022 at 09:44:33PM -0800, H. Peter Anvin wrote:
>
>> Right, this is one major reason for putting #DB/NMI in a separate stack level.
>
>But with the IST they each have their own stack, with FRED they'll share
>this small stack.

So make the stack larger if you think we need it. You still end up using less total stack space with FRED.