From: Borislav Petkov <bp@alien8.de>
To: Andy Lutomirski <luto@kernel.org>
Cc: security@kernel.org, x86@kernel.org,
linux-kernel@vger.kernel.org,
Linus Torvalds <torvalds@linux-foundation.org>,
Rudolf Marek <r.marek@assembler.cz>
Subject: Re: [PATCH v3 0/7] x86: Pile o' FS/GS changes
Date: Fri, 8 Apr 2016 12:39:39 +0200 [thread overview]
Message-ID: <20160408103939.GE29522@pd.tnic> (raw)
In-Reply-To: <cover.1460075211.git.luto@kernel.org>
On Thu, Apr 07, 2016 at 05:31:43PM -0700, Andy Lutomirski wrote:
> Hi all-
>
> This whole mess is intended for x86/urgent. It fixes several bugs.
>
> It's probably a tiny performance regression on some workloads on
> Intel CPUs. It's probably varies between a less tiny regression and
> a small speedup on newer AMD CPUs. It's a bigger regression on AMD
> K8.
Shhh, otherwise the 2-3 K8 users left would crawl out of the woodwork
complaining. ;-)
> The AMD code could be further sped up by adding a new 'clear_gs'
> pvop with a better native implementation. I don't particularly want
> to deal with a backported new pvop, so I didn't do that. Maybe I'll
> do it later on for new kernels, though.
Yeah, before you do that, we should probably measure that first to see
whether it is worth the trouble and the added pvop gunk at all.
--
Regards/Gruss,
Boris.
ECO tip #101: Trim your mails when you reply.
next prev parent reply other threads:[~2016-04-08 10:39 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-04-08 0:31 Andy Lutomirski
2016-04-08 0:31 ` [PATCH v3 1/7] selftests/x86: Test the FSBASE/GSBASE API and context switching Andy Lutomirski
2016-04-13 11:28 ` [tip:x86/asm] " tip-bot for Andy Lutomirski
2016-04-08 0:31 ` [PATCH v3 5/7] x86/cpu: Move X86_BUG_ESPFIX initialization to generic_identify Andy Lutomirski
2016-04-13 11:30 ` [tip:x86/asm] x86/cpu: Move X86_BUG_ESPFIX initialization to generic_identify() tip-bot for Andy Lutomirski
2016-04-08 0:31 ` [PATCH v3 7/7] x86/entry: Make gs_change a local label Andy Lutomirski
2016-04-13 11:31 ` [tip:x86/asm] x86/entry/64: " tip-bot for Borislav Petkov
2016-04-08 10:39 ` Borislav Petkov [this message]
2016-04-08 10:40 ` [PATCH v3 0/7] x86: Pile o' FS/GS changes Borislav Petkov
[not found] ` <c6e7b507c72ca3bdbf6c7a8a3ceaa0334e873bd9.1460075211.git.luto@kernel.org>
2016-04-08 7:13 ` [PATCH v3 2/7] x86/arch_prctl: Fix ARCH_GET_FS and ARCH_GET_GS Ingo Molnar
2016-04-08 9:39 ` Dmitry Safonov
2016-04-08 16:03 ` Andy Lutomirski
2016-04-13 11:29 ` [tip:x86/asm] " tip-bot for Andy Lutomirski
[not found] ` <aec6b2df1bfc56101d4e9e2e5d5d570bf41663c6.1460075211.git.luto@kernel.org>
2016-04-08 1:40 ` [PATCH v3 6/7] x86/cpu: Add Erratum 88 detection on AMD Andy Lutomirski
2016-04-08 9:51 ` Borislav Petkov
2016-04-13 11:30 ` [tip:x86/asm] " tip-bot for Borislav Petkov
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