From: Dave Hansen <dave.hansen@linux.intel.com>
To: Nadav Amit <nadav.amit@gmail.com>
Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org,
luto@kernel.org, torvalds@linux-foundation.org,
keescook@google.com, hughd@google.com, jgross@suse.com,
x86@kernel.org
Subject: Re: [PATCH 2/3] x86/mm: introduce __PAGE_KERNEL_GLOBAL
Date: Fri, 16 Feb 2018 10:03:50 -0800 [thread overview]
Message-ID: <a3dd1676-a2dc-aa02-77ad-51cd3b7a78d5@linux.intel.com> (raw)
In-Reply-To: <E0AB2852-C4E0-43D3-ABA7-34117A5516C1@gmail.com>
On 02/16/2018 09:47 AM, Nadav Amit wrote:
>> But, this also means that we now get *no* opportunity to use
>> global pages with PTI, even for data which is shared such as the
>> cpu_entry_area and entry/exit text.
>
> Doesna??t this patch change the kernel behavior when the a??noptia??
> parameter is used?
I don't think so. It takes the "nopti" behavior and effectively makes
it apply everywhere. So it changes the PTI behavior, not the "nopti"
behavior.
Maybe it would help to quote the code that you think does this instead
of the description. :)
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next prev parent reply other threads:[~2018-02-16 18:03 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-02-15 13:20 [PATCH 0/3] Use global pages with PTI Dave Hansen
2018-02-15 13:20 ` [PATCH 1/3] x86/mm: factor out conditional pageattr PTE bit setting code Dave Hansen
2018-02-15 13:20 ` [PATCH 2/3] x86/mm: introduce __PAGE_KERNEL_GLOBAL Dave Hansen
2018-02-16 17:47 ` Nadav Amit
2018-02-16 18:03 ` Dave Hansen [this message]
2018-02-16 18:25 ` Nadav Amit
2018-02-16 19:06 ` Dave Hansen
2018-02-16 19:54 ` Nadav Amit
2018-02-16 20:00 ` Dave Hansen
2018-02-16 23:19 ` Dave Hansen
2018-02-15 13:20 ` [PATCH 3/3] x86/pti: enable global pages for shared areas Dave Hansen
2018-02-15 17:47 ` [PATCH 0/3] Use global pages with PTI Linus Torvalds
2018-02-15 18:13 ` Dave Hansen
2018-02-15 23:55 ` Dave Hansen
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