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From: Borislav Petkov <bp@alien8.de>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Borislav Petkov <bp@kernel.org>,
	Andy Lutomirski <luto@kernel.org>, Peter Anvin <hpa@zytor.com>,
	the arch/x86 maintainers <x86@kernel.org>,
	One Thousand Gnomes <gnomes@lxorguk.ukuu.org.uk>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	Brian Gerst <brgerst@gmail.com>,
	Matthew Whitehead <tedheadster@gmail.com>,
	Henrique de Moraes Holschuh <hmh@hmh.eng.br>,
	Peter Zijlstra <peterz@infradead.org>,
	Andrew Cooper <andrew.cooper3@citrix.com>
Subject: Re: [PATCH v2 5/6] x86/xen: Add a Xen-specific sync_core() implementation
Date: Fri, 2 Dec 2016 20:28:44 +0100	[thread overview]
Message-ID: <20161202192844.elq2py3cxizjs2bx@pd.tnic> (raw)
In-Reply-To: <CA+55aFydg4RDv8a-Wpf=TyzPN59kONcUdCkk1KcSNMW_2Uix_g@mail.gmail.com>

On Fri, Dec 02, 2016 at 11:24:09AM -0800, Linus Torvalds wrote:
> The optimize-nops thing needs it too, I think.

Ah, it is called only from apply_alternatives() but sure, it is safer
this way. Lemme do that and run it through the boxes to see whether
anything catches fire.

> Again, this will never matter in practice (even if somebody has a i486
> s till, the prefetch window size is like 16 bytes or something), but
> from a documentation standpoint it's good.

Right.

Thanks.

-- 
Regards/Gruss,
    Boris.

Good mailing practices for 400: avoid top-posting and trim the reply.

  reply	other threads:[~2016-12-02 19:28 UTC|newest]

Thread overview: 65+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-11-30 20:34 [PATCH 0/4] CPUID-less CPU fixes and improvements Andy Lutomirski
2016-11-30 20:34 ` [PATCH 1/4] x86/asm/32: Make sync_core() handle missing CPUID on all 32-bit kernels Andy Lutomirski
2016-11-30 20:34 ` [PATCH 2/4] Revert "x86/boot: Fail the boot if !M486 and CPUID is missing" Andy Lutomirski
2016-12-01  5:53   ` Peter Zijlstra
2016-12-01  9:02     ` Borislav Petkov
2016-12-01 10:07       ` Thomas Gleixner
2016-12-01 11:15         ` [PATCH] x86/CPU: Add X86_FEATURE_CPUID Borislav Petkov
2016-12-01 17:00           ` Andy Lutomirski
2016-12-02  0:33       ` [PATCH 2/4] Revert "x86/boot: Fail the boot if !M486 and CPUID is missing" Andy Lutomirski
2016-12-01 17:00     ` Andy Lutomirski
2016-11-30 20:34 ` [PATCH 3/4] x86/microcode/intel: Replace sync_core() with cpuid_eax(1) Andy Lutomirski
2016-12-01  9:11   ` Borislav Petkov
2016-11-30 20:34 ` [PATCH 4/4] x86/asm: Change sync_core() to use MOV to CR2 to serialize Andy Lutomirski
2016-12-01  9:22   ` Borislav Petkov
2016-12-01 17:08     ` Andy Lutomirski
2016-12-01 17:46       ` Andrew Cooper
2016-12-02  7:34     ` Ingo Molnar
2016-12-02  0:34 ` [PATCH v2 0/6] CPUID-less CPU/sync_core fixes and improvements Andy Lutomirski
2016-12-02  0:34   ` [PATCH v2 1/6] x86/asm/32: Make sync_core() handle missing CPUID on all 32-bit kernels Andy Lutomirski
2016-12-02  0:34   ` [PATCH v2 2/6] Revert "x86/boot: Fail the boot if !M486 and CPUID is missing" Andy Lutomirski
2016-12-02  0:34   ` [PATCH v2 3/6] x86/microcode/intel: Replace sync_core() with cpuid_eax(1) Andy Lutomirski
2016-12-02  0:35   ` [PATCH v2 4/6] x86/paravirt: Make sync_core() be a paravirt op Andy Lutomirski
2016-12-02  0:35   ` [PATCH v2 5/6] x86/xen: Add a Xen-specific sync_core() implementation Andy Lutomirski
2016-12-02 11:44     ` Andrew Cooper
2016-12-02 11:44     ` Andrew Cooper
2016-12-02 17:07       ` Andy Lutomirski
2016-12-02 17:07       ` Andy Lutomirski
2016-12-02 17:16         ` Andrew Cooper
2016-12-02 17:16         ` Andrew Cooper
2016-12-02 17:23           ` Andy Lutomirski
2016-12-02 17:26             ` Andrew Cooper
2016-12-02 17:26             ` Andrew Cooper
2016-12-02 17:23           ` Andy Lutomirski
2016-12-02 18:50       ` Boris Ostrovsky
2016-12-02 18:50       ` Boris Ostrovsky
2016-12-02 19:34         ` Andy Lutomirski
2016-12-02 19:34         ` Andy Lutomirski
2016-12-02 20:09       ` Boris Ostrovsky
2016-12-02 20:09         ` Boris Ostrovsky
2016-12-02 17:32     ` Linus Torvalds
2016-12-02 17:38       ` Andy Lutomirski
2016-12-02 17:53         ` Linus Torvalds
2016-12-02 18:03         ` Borislav Petkov
2016-12-02 18:27           ` Linus Torvalds
2016-12-02 18:50             ` Borislav Petkov
2016-12-02 19:03               ` Linus Torvalds
2016-12-02 19:20                 ` Borislav Petkov
2016-12-02 19:24                   ` Linus Torvalds
2016-12-02 19:28                     ` Borislav Petkov [this message]
2016-12-03 15:02                       ` [PATCH] x86/alternatives: Do not use sync_core() to serialize I$ Borislav Petkov
2016-12-03 17:05                         ` Andy Lutomirski
2016-12-20  7:58                         ` [tip:x86/urgent] " tip-bot for Borislav Petkov
2016-12-20  9:35                         ` tip-bot for Borislav Petkov
2016-12-02 19:30                     ` [PATCH v2 5/6] x86/xen: Add a Xen-specific sync_core() implementation Andy Lutomirski
2016-12-02 19:35                       ` Linus Torvalds
2016-12-02 20:41                         ` Andy Lutomirski
2016-12-02 21:10                           ` Linus Torvalds
2016-12-02 22:55                             ` Andy Lutomirski
2016-12-02 23:09                               ` Linus Torvalds
2016-12-02 19:23                 ` Andy Lutomirski
2016-12-02 19:30                   ` Borislav Petkov
2016-12-03 12:44         ` Borislav Petkov
2016-12-02  0:35   ` [PATCH v2 6/6] x86/asm: Change sync_core() to use MOV to CR2 to serialize Andy Lutomirski
2016-12-02  0:36 ` [PATCH 0/4] CPUID-less CPU fixes and improvements Andy Lutomirski
2016-12-02 10:17   ` Ingo Molnar

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