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From: "H. Peter Anvin" <hpa@zytor.com>
Subject: Re: [PATCH v11 00/11] x86: PIE support to extend KASLR randomization
Date: Wed, 4 Mar 2020 11:22:04 -0800
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To: Thomas Garnier <thgarnie@chromium.org>
Cc: Kristen Carlson Accardi <kristen@linux.intel.com>, Kernel Hardening <kernel-hardening@lists.openwall.com>, Peter Zijlstra <peterz@infradead.org>, Rasmus Villemoes <linux@rasmusvillemoes.dk>, virtualization@lists.linux-foundation.org, Pavel Machek <pavel@ucw.cz>, Will Deacon <will@kernel.org>, Ard Biesheuvel <ardb@kernel.org>, Thomas Hellstrom <thellstrom@vmware.com>, Herbert Xu <herbert@gondor.apana.org.au>, Jiri Slaby <jslaby@suse.cz>, Boris Ostrovsky <boris.ostrovsky@oracle.com>, the arch/x86 maintainers <x86@kernel.org>, "VMware,
 Inc." <pv-drivers@vmware.com>, Ingo Molnar <mingo@redhat.com>, Linux Crypto Mailing List <linux-crypto@vger.kernel.org>, Len Brown <len.brown@intel.com>, Kees Cook <keescook@chromium.org>, Linux PM list <linux-pm@vger.kernel.org>, Cao jin <caoj.fnst@cn.fujitsu.com>, Borislav Petkov <bp@alien8.de>, Andy Lutomirski <luto@kernel.org>, Josh
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On 2020-03-04 11:19, Thomas Garnier wrote:
>>
>> The huge memory model, required for arbitrary placement, has a very
>> significant performance impact.
> 
> I assume you mean mcmodel=large, it doesn't use it. It uses -fPIE and
> removes -mcmodel=kernel. It favors relative references whenever
> possible.
> 

I know... this was in reference to a comment of Kees'.

	-hpa