linux-kernel - Re: [PATCH v3 01/11] x86/boot: enumerate documentation for the x86 hardware

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Message-ID: <CALCETrW=dia7QCDhJVF8rnaKGDx_NNYVZqUNZSs9R87_o=h6NQ@mail.gmail.com>
Date:	Wed, 24 Feb 2016 08:40:32 -0800
From:	Andy Lutomirski <luto@...capital.net>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	Boris Ostrovsky <boris.ostrovsky@...cle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Andrew Cooper <andrew.cooper3@...rix.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Xen Devel <xen-devel@...ts.xensource.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	"Luis R. Rodriguez" <mcgrof@...nel.org>, lguest@...ts.ozlabs.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	David Vrabel <david.vrabel@...rix.com>,
	Borislav Petkov <bp@...en8.de>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	X86 ML <x86@...nel.org>, Ingo Molnar <mingo@...hat.com>
Subject: Re: [PATCH v3 01/11] x86/boot: enumerate documentation for the x86 hardware_subarch

On Feb 24, 2016 12:33 AM, "Ingo Molnar" <mingo@...nel.org> wrote:
>
> For hard coded platform quirks I'd suggest we add x86_platform.quirks flags. For
> example the F00F hack for Xen could be done via:
>
>         x86_platform.quirks.idt_remap = 0;
>

Don't we unconditionally remap the IDT?  I think Kees did it for
general purpose hardening due to our complete inability to hide the
IDT address. I.e. I think we can remove the f00f condition entirely.

Other than that, I agree with you.