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

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Subject: Re: [RFC PATCH 22/32] x86/fred: FRED initialization code
From: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Date: Thu, 22 Dec 2022 14:09:28 +0100
Cc: "Li, Xin3" <xin3.li@xxxxxxxxx>, "andrew.cooper3@xxxxxxxxxx" <andrew.cooper3@xxxxxxxxxx>, "linux-kernel@xxxxxxxxxxxxxxx" <linux-kernel@xxxxxxxxxxxxxxx>, "x86@xxxxxxxxxx" <x86@xxxxxxxxxx>, "kvm@xxxxxxxxxxxxxxx" <kvm@xxxxxxxxxxxxxxx>, "tglx@xxxxxxxxxxxxx" <tglx@xxxxxxxxxxxxx>, "mingo@xxxxxxxxxx" <mingo@xxxxxxxxxx>, "bp@xxxxxxxxx" <bp@xxxxxxxxx>, "dave.hansen@xxxxxxxxxxxxxxx" <dave.hansen@xxxxxxxxxxxxxxx>, "Christopherson,, Sean" <seanjc@xxxxxxxxxx>, "pbonzini@xxxxxxxxxx" <pbonzini@xxxxxxxxxx>, "Shankar, Ravi V" <ravi.v.shankar@xxxxxxxxx>
In-reply-to: <0D72CCA1-A0B6-487B-A6B9-7341020D28A2@zytor.com>
References: <20221220063658.19271-1-xin3.li@intel.com> <20221220063658.19271-23-xin3.li@intel.com> <Y6GELyEJeKY3dEqJ@hirez.programming.kicks-ass.net> <16972e64-7d7b-ad8c-f8dc-6dcab69e629e@citrix.com> <Y6GIN5Uf7Qd43A9U@hirez.programming.kicks-ass.net> <BN6PR1101MB2161C51C6068026D9C442460A8EB9@BN6PR1101MB2161.namprd11.prod.outlook.com> <0D72CCA1-A0B6-487B-A6B9-7341020D28A2@zytor.com>

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.

Follow-Ups:
- Re: [RFC PATCH 22/32] x86/fred: FRED initialization code
  - From: H. Peter Anvin

References:
- [RFC PATCH 00/32] x86: enable FRED for x86-64
  - From: Xin Li
- [RFC PATCH 22/32] x86/fred: FRED initialization code
  - From: Xin Li
- Re: [RFC PATCH 22/32] x86/fred: FRED initialization code
  - From: Peter Zijlstra
- Re: [RFC PATCH 22/32] x86/fred: FRED initialization code
  - From: Andrew Cooper
- Re: [RFC PATCH 22/32] x86/fred: FRED initialization code
  - From: Peter Zijlstra
- RE: [RFC PATCH 22/32] x86/fred: FRED initialization code
  - From: Li, Xin3
- RE: [RFC PATCH 22/32] x86/fred: FRED initialization code
  - From: H. Peter Anvin

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