linux-kernel - Re: [PATCH v5] x86: make sure IDT is page aligned

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Message-ID: <CAE9FiQW-3H=rx-VewjMQjx2EOwcyDt351aQ0wnP8op6ZLViZag@mail.gmail.com>
Date:	Tue, 16 Jul 2013 15:13:54 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Kees Cook <keescook@...omium.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"the arch/x86 maintainers" <x86@...nel.org>,
	Seiji Aguchi <seiji.aguchi@....com>,
	Fenghua Yu <fenghua.yu@...el.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Suresh Siddha <suresh.b.siddha@...el.com>,
	PaX Team <pageexec@...il.com>
Subject: Re: [PATCH v5] x86: make sure IDT is page aligned

On Tue, Jul 16, 2013 at 3:03 PM, H. Peter Anvin <hpa@...or.com> wrote:
> On 07/16/2013 01:47 PM, Kees Cook wrote:

>> The other IDTs don't need to be page aligned, but I marked them that
>> way in the clean up because it seemed sensible to define these tables
>> similarly. I can change the others to be __cacheline_aligned_bss if
>> that's desired.
>>
>
> I'm fine keeping them as page aligned.  They are page-sized on x86-64
> anyway (half page on i386).

ok, then should change

> +/* No need to be aligned, but done to keep all IDTs defined the same way. */
> +gate_desc trace_idt_table[NR_VECTORS] __page_aligned_bss;

==>

> +/* Only need to be cacheline aligned, but keep all IDTs defined the same way to be page aligned. */
> +gate_desc trace_idt_table[NR_VECTORS] __page_aligned_bss;
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