linux-kernel - RE: [PATCH 1/2] x86/fred: Always install system interrupt handler into IDT

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Date: Tue, 25 Jun 2024 17:08:03 +0000
From: "Li, Xin3" <xin3.li@...el.com>
To: Thomas Gleixner <tglx@...utronix.de>, Xin Li <xin@...or.com>, Hou Wenlong
	<houwenlong.hwl@...group.com>, "linux-kernel@...r.kernel.org"
	<linux-kernel@...r.kernel.org>
CC: Lai Jiangshan <jiangshan.ljs@...group.com>, Ingo Molnar
	<mingo@...hat.com>, Borislav Petkov <bp@...en8.de>, Dave Hansen
	<dave.hansen@...ux.intel.com>, "x86@...nel.org" <x86@...nel.org>, "H. Peter
 Anvin" <hpa@...or.com>, Jacob Pan <jacob.jun.pan@...ux.intel.com>,
	"Edgecombe, Rick P" <rick.p.edgecombe@...el.com>, Paolo Bonzini
	<pbonzini@...hat.com>
Subject: RE: [PATCH 1/2] x86/fred: Always install system interrupt handler
 into IDT

> >>> And please put a comment here to explain why this is unconditionally
> >>> done for IDT.
> >>
> >> Wait. If we need this during early boot, then why don't we enable
> >> FRED earlier?
> >
> > Unconditionally call idt_install_sysvec() is still needed, right?
> 
> Not when we enable FRED early enough.
> 

What if FRED is disabled in the kernel command line?

"fred=off" gets parsed in a later stage of the kernel initialization sequence.

Thanks!
    Xin