linux-kernel - Re: [PATCH 30/62] x86/head/64: Move early exception dispatch to C code

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Message-ID: <20200212123902.GG20066@8bytes.org>
Date:   Wed, 12 Feb 2020 13:39:02 +0100
From:   Joerg Roedel <joro@...tes.org>
To:     Andy Lutomirski <luto@...nel.org>
Cc:     X86 ML <x86@...nel.org>, "H. Peter Anvin" <hpa@...or.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Hellstrom <thellstrom@...are.com>,
        Jiri Slaby <jslaby@...e.cz>,
        Dan Williams <dan.j.williams@...el.com>,
        Tom Lendacky <thomas.lendacky@....com>,
        Juergen Gross <jgross@...e.com>,
        Kees Cook <keescook@...omium.org>,
        LKML <linux-kernel@...r.kernel.org>,
        kvm list <kvm@...r.kernel.org>,
        Linux Virtualization <virtualization@...ts.linux-foundation.org>,
        Joerg Roedel <jroedel@...e.de>
Subject: Re: [PATCH 30/62] x86/head/64: Move early exception dispatch to C
 code

On Tue, Feb 11, 2020 at 02:44:45PM -0800, Andy Lutomirski wrote:
> How about int (or bool) handled;  Or just if (!early_make_pgtable)
> return;  This would also be nicer if you inverted the return value so
> that true means "I handled it".

Okay, makes sense. Changed the return value of early_make_pgtable() to bool and
this function to:

	void __init early_exception(struct pt_regs *regs, int trapnr)
	{
		if (trapnr == X86_TRAP_PF &&
		    early_make_pgtable(native_read_cr2()))
				return;

		early_fixup_exception(regs, trapnr);
	}

Regards,

	Joerg