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From: "H. Peter Anvin" <hpa@zytor.com>
To: Borislav Petkov <bp@alien8.de>,
	Linus Torvalds <torvalds@linux-foundation.org>,
	"H. Peter Anvin" <hpa@linux.intel.com>,
	Ingo Molnar <mingo@kernel.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	Mario Gzuk <mariogzuk@technikz.de>
Subject: Re: [PATCH 8/8] x86, cleanups: Simplify sync_core() in the case of no CPUID
Date: Fri, 30 Nov 2012 10:40:26 -0800
Message-ID: <50B8FD9A.3040703@zytor.com> (raw)
In-Reply-To: <20121130181037.GE23034@liondog.tnic>

On 11/30/2012 10:10 AM, Borislav Petkov wrote:
> On Fri, Nov 30, 2012 at 10:03:03AM -0800, H. Peter Anvin wrote:
>> Well, the grand total of serializing instructions are:
>>
>> INVD, INVEPT, INVLPG, INVVPID, LGDT, LIDT, LLDT, LTR, MOV to CR, MOV
>> to DR, WBINVD, WRMSR, CPUID, IRET, RSM.
> 
> What about MFENCE with JMP 1f to kill prefetches? Probably too
> expensive. Oh and MFENCE is an SSE2 insn so maybe not supported by 486
> or something later ...

It's not serializing in the strict sense.

	-hpa


  reply index

Thread overview: 35+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2012-11-28 19:50 [PATCH 0/8] RFC: Remove 386 support H. Peter Anvin
2012-11-28 19:50 ` [PATCH 1/8] x86, 386 removal: Remove CONFIG_M386 from Kconfig H. Peter Anvin
2012-12-01  0:34   ` [tip:x86/nuke386] " tip-bot for H. Peter Anvin
2012-11-28 19:50 ` [PATCH 2/8] x86, 386 removal: Remove CONFIG_CMPXCHG H. Peter Anvin
2012-12-01  0:35   ` [tip:x86/nuke386] " tip-bot for H. Peter Anvin
2012-11-28 19:50 ` [PATCH 3/8] x86, 386 removal: Remove CONFIG_XADD H. Peter Anvin
2012-11-28 20:30   ` Borislav Petkov
2012-12-01  0:36   ` [tip:x86/nuke386] " tip-bot for H. Peter Anvin
2012-11-28 19:50 ` [PATCH 4/8] x86, 386 removal: Remove CONFIG_BSWAP H. Peter Anvin
2012-12-01  0:37   ` [tip:x86/nuke386] " tip-bot for H. Peter Anvin
2012-11-28 19:50 ` [PATCH 5/8] x86, 386 removal: Remove CONFIG_INVLPG H. Peter Anvin
2012-12-01  0:38   ` [tip:x86/nuke386] " tip-bot for H. Peter Anvin
2012-11-28 19:50 ` [PATCH 6/8] x86, 386 removal: Remove CONFIG_X86_WP_WORKS_OK H. Peter Anvin
2012-11-28 20:52   ` Alan Cox
2012-11-28 23:11     ` H. Peter Anvin
2012-12-01  0:42     ` [tip:x86/nuke386] x86, 386 removal: Document Nx586 as a 386 and thus unsupported tip-bot for H. Peter Anvin
2012-12-01  0:39   ` [tip:x86/nuke386] x86, 386 removal: Remove CONFIG_X86_WP_WORKS_OK tip-bot for H. Peter Anvin
2012-11-28 19:50 ` [PATCH 7/8] x86, 386 removal: Remove CONFIG_X86_POPAD_OK H. Peter Anvin
2012-12-01  0:40   ` [tip:x86/nuke386] " tip-bot for H. Peter Anvin
2012-11-28 19:50 ` [PATCH 8/8] x86, cleanups: Simplify sync_core() in the case of no CPUID H. Peter Anvin
2012-11-28 20:41   ` Borislav Petkov
2012-11-29  0:14     ` H. Peter Anvin
2012-11-29  9:13       ` Borislav Petkov
2012-11-29 21:06         ` H. Peter Anvin
2012-11-29 21:18           ` Borislav Petkov
2012-11-29 21:20             ` H. Peter Anvin
2012-11-29 21:31               ` Borislav Petkov
2012-11-29 21:24     ` H. Peter Anvin
2012-11-29 21:34       ` Borislav Petkov
2012-11-30 17:01       ` Linus Torvalds
2012-11-30 17:28         ` Borislav Petkov
2012-11-30 18:03         ` H. Peter Anvin
2012-11-30 18:10           ` Borislav Petkov
2012-11-30 18:40             ` H. Peter Anvin [this message]
2012-12-01  0:41   ` [tip:x86/nuke386] " tip-bot for H. Peter Anvin

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