From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Google-Smtp-Source: AH8x224hnhD8RlqdFWjMJJ1oVl1d+whEF5vdTslQUxroXwNj5SWw564I/pdL0M9rOYZx45UnckOi ARC-Seal: i=1; a=rsa-sha256; t=1517056393; cv=none; d=google.com; s=arc-20160816; b=cXGLaLzdaMJWg7asmj/6GnwK29L+tPeefENZ8xjNBgseNRccKUqLZ0Mw+1IuIguqXg rnZ6HYOcAByVcbRYWPHnM6gLFhyiTeJk1vdTxWCidT2PKzcotQ0qcTmZGhlTS9K9qkY0 lEAlE/BInJJRur6Dr2hPduNsBys3wVpbc4bkSeDRHS1X9GZjVuBPcit3tNK6Ee9OOSVu KzSWhT6xnHaBJbOk/3GquaAnVhnN4FO3vLyPazzwJdkHqrJriybQSJzz4W54qNof4KT+ o/6qlgwfheVWR2evIZAMYcJu6V/sOchlsP6rSKXYaqS6m1PxNJE1AakMIPlqq1E+GJ8i V7kw== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=mime-version:date:face:references:in-reply-to:cc:to:from:subject :message-id:dkim-signature:arc-authentication-results; bh=zE1JfzTQnviZIpT1COXsTYXB64l97gIOhox4jJ/4Sck=; b=DyBYqhF8sTSQXZ7Y2qzcyVBLZdlc9MqAiwpDbiG/+P+UQ93omX2+3piQO0yoLHR2B9 HnHEzBngZcHj4c/fcPtiaQ75pw4zB8hAaWodyW82Pjk1Vp/GX/lKy3LornxibqKlXGvF AnlFij06YnTS1PVsqaud2OBbuhFDJJadOtRtvwBAUFNKeUef6J+TUW5CXt0kM04+ovEs GtkOUeH+j3Yd4eQ7Ye0rX9qyQJ+A3F+7l0cj4mKvEQUfDLZZSntYVk76zxaxYVTsiM9T R8twrYlNLAZs95DUpG6dT4a4CKnz1UZO/Mod2kh+i1r9kC2EEiresaIaSX5n/R/0SSMy ZT6g== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@infradead.org header.s=twosheds.20170209 header.b=BtTfY7Ez; spf=pass (google.com: best guess record for domain of batv+d19d6b14893afbaeb2fd+5270+infradead.org+dwmw2@twosheds.srs.infradead.org designates 2001:8b0:10b:1:21d:7dff:fe04:dbe2 as permitted sender) smtp.mailfrom=BATV+d19d6b14893afbaeb2fd+5270+infradead.org+dwmw2@twosheds.srs.infradead.org Authentication-Results: mx.google.com; dkim=pass header.i=@infradead.org header.s=twosheds.20170209 header.b=BtTfY7Ez; spf=pass (google.com: best guess record for domain of batv+d19d6b14893afbaeb2fd+5270+infradead.org+dwmw2@twosheds.srs.infradead.org designates 2001:8b0:10b:1:21d:7dff:fe04:dbe2 as permitted sender) smtp.mailfrom=BATV+d19d6b14893afbaeb2fd+5270+infradead.org+dwmw2@twosheds.srs.infradead.org Message-ID: <1517056361.6624.17.camel@infradead.org> Subject: Re: [PATCH 2/2] x86/speculation: Simplify indirect_branch_prediction_barrier() From: David Woodhouse To: Borislav Petkov Cc: X86 ML , LKML , Josh Poimboeuf , tim.c.chen@linux.intel.com, pjt@google.com, jikos@kernel.org, gregkh@linux-foundation.org, dave.hansen@intel.com, riel@redhat.com, luto@amacapital.net, torvalds@linux-foundation.org, ak@linux.intel.com, keescook@google.com, peterz@infradead.org In-Reply-To: <20180126200813.cignvfovk2dhlzbh@pd.tnic> References: <20180126121139.31959-1-bp@alien8.de> <20180126121139.31959-4-bp@alien8.de> <1516970011.30244.223.camel@infradead.org> <20180126132431.fsbd3c3g2yreazy6@pd.tnic> <1516983879.30244.236.camel@infradead.org> <20180126164746.dpo7dswid5tjk2tz@pd.tnic> <20180126200616.5xfn244uzeu7ptyo@pd.tnic> <20180126200813.cignvfovk2dhlzbh@pd.tnic> Face: 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 Content-Type: multipart/signed; micalg="sha-256"; protocol="application/x-pkcs7-signature"; boundary="=-0Epn1ko7XEzBeZr6+rG1" Date: Sat, 27 Jan 2018 12:32:41 +0000 Mime-Version: 1.0 X-Mailer: Evolution 3.18.5.2-0ubuntu3.2 X-SRS-Rewrite: SMTP reverse-path rewritten from by twosheds.infradead.org. See http://www.infradead.org/rpr.html X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: =?utf-8?q?1590686965266539786?= X-GMAIL-MSGID: =?utf-8?q?1590748920605295420?= X-Mailing-List: linux-kernel@vger.kernel.org List-ID: --=-0Epn1ko7XEzBeZr6+rG1 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Fri, 2018-01-26 at 21:08 +0100, Borislav Petkov wrote: >=20 > --- a/arch/x86/include/asm/processor.h > +++ b/arch/x86/include/asm/processor.h > @@ -971,4 +971,8 @@ bool xen_set_default_idle(void); > =C2=A0 > =C2=A0void stop_this_cpu(void *dummy); > =C2=A0void df_debug(struct pt_regs *regs, long error_code); > + > +#ifdef CONFIG_RETPOLINE > +void __ibp_barrier(void); > +#endif > =C2=A0#endif /* _ASM_X86_PROCESSOR_H */ Did I already say that needs to live in asm-prototypes.h? And it needs to be exported to modules, I think. --=-0Epn1ko7XEzBeZr6+rG1 Content-Type: application/x-pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCEFQw ggUxMIIEGaADAgECAhBNRhEyk/HZ7naOeTHWrzuAMA0GCSqGSIb3DQEBCwUAMIGXMQswCQYDVQQG EwJHQjEbMBkGA1UECBMSR3JlYXRlciBNYW5jaGVzdGVyMRAwDgYDVQQHEwdTYWxmb3JkMRowGAYD VQQKExFDT01PRE8gQ0EgTGltaXRlZDE9MDsGA1UEAxM0Q09NT0RPIFJTQSBDbGllbnQgQXV0aGVu dGljYXRpb24gYW5kIFNlY3VyZSBFbWFpbCBDQTAeFw0xNzEyMjEwMDAwMDBaFw0xODEyMjEyMzU5 NTlaMCQxIjAgBgkqhkiG9w0BCQEWE2R3bXcyQGluZnJhZGVhZC5vcmcwggEiMA0GCSqGSIb3DQEB AQUAA4IBDwAwggEKAoIBAQDgzLNWa18DNpGUj/ZeH0Sgz53ESIbzdPw3OJeuNP6jZhxZojbyfxbM hETscxI/Hj6UZ4a7sHm5BkVjlsB1Af2Za/PXUt8MmLAcPMHkMPGunvkUibEvblDvpqMkQZlaZM+t 5PqFmWkbehLaEvbpNY7dmEAAeKh4klTzJzrr5AAzaCQ32cA2e3+DEIv5O5l9ViMIjy/JM+xMQrfX 3PZ0chY1PaVWjg59d4Uno+5LRDbgCnPkKJX4ysBGadibjBGQGJEZCjh94iiEebn2KsRLvtrJ72Ph 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