linux-kernel - RE: [PATCH v8 01/33] x86/traps: let common_interrupt() handle IRQ_MOVE_CLEANUP

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Message-ID: <SA1PR11MB6734DB9D958F9F859A0B354AA84FA@SA1PR11MB6734.namprd11.prod.outlook.com>
Date:   Sat, 3 Jun 2023 19:19:58 +0000
From:   "Li, Xin3" <xin3.li@...el.com>
To:     Borislav Petkov <bp@...en8.de>
CC:     "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>,
        "dave.hansen@...ux.intel.com" <dave.hansen@...ux.intel.com>,
        "hpa@...or.com" <hpa@...or.com>,
        "peterz@...radead.org" <peterz@...radead.org>,
        "andrew.cooper3@...rix.com" <andrew.cooper3@...rix.com>,
        "Christopherson,, Sean" <seanjc@...gle.com>,
        "pbonzini@...hat.com" <pbonzini@...hat.com>,
        "Shankar, Ravi V" <ravi.v.shankar@...el.com>,
        "jiangshanlai@...il.com" <jiangshanlai@...il.com>,
        "Kang, Shan" <shan.kang@...el.com>,
        "Lutomirski, Andy" <luto@...nel.org>
Subject: RE: [PATCH v8 01/33] x86/traps: let common_interrupt() handle
 IRQ_MOVE_CLEANUP_VECTOR

> > IRQ_MOVE_CLEANUP_VECTOR is the only one of the system IRQ vectors that
> > is *below* FIRST_SYSTEM_VECTOR. It is a slow path, so just push it
> > into common_interrupt() just before the spurious interrupt handling.
> 
> I'm missing here the "why":
> 
> I can go forward into the set and see that you're splitting the handling based on
> vector types and there's event classification and the lowest prio vector is not
> going to be hardwired to 0x20, yadda yadda...
> 
> but some of that should be in the text here so that it is clear why it is being done.

Per Dave's ask, I am adding details about the benefits that FRED introduces,
and then why we make these changes, which should make it clearer.

Thanks!
Xin