From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Google-Smtp-Source: AH8x227xuXzOYChAhyidYiKzPrBd6ZFhRvgm4FjTPHYn3y3K2B+psgQBXOePfWLEuOH55q64oE52 ARC-Seal: i=1; a=rsa-sha256; t=1516882333; cv=none; d=google.com; s=arc-20160816; b=Dxh2chHccUvsr5UGzLLbrrck50c4gSmddJTnZSmYNABBlVJqU00MvrSsEHA8BC+sWj V9ZAIkxYGXUdYgWE1f/qiF6DSg9oPZsmnty/tJkVDd7FAYAoUmV9R7pvaC+ZSas4wQil bYIl4nWEidQ6H7rCr1qEDth9y0f7wgAN2L8i0ARaleOn/ewSJn5bxMTv7iYMfgR2Tar0 g0Xw4E6vL2nHSg78Mi/VIUwk7N0KFn87QYVpC8tQxOokoJeHFHVk8hux9pAOgKK23kGb +md52sCOeTISZIsKjriOWXvypnr+QwAwIm2Wy01eotUrkNhN60+74fK4f8k1fzCgMG1a aJ3w== 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=w98gMl1wzrFj8AvJpinIGd+CR+lC6L27owdZ6l+TIUs=; b=toubyEVtXh0kTdLbKyGVbJgNUeXfTgRUP4WeJTPQV7Fb/5B5te59GNXJKwSAE+gRoh vYg7Ya0S5tjDJtguEej5ec0Vp9+1X65RToMHkbebdxHLJl41VJ7WA3TlVgBZkX/VWQQ0 KjlSEPoGNgrcJdAdEaQJiVPqLxXyeKmx263JoWiSKRkPd10zVubfQGy6akY1t3vUnB74 Ilw2VgXSo1HIFy08S4gLNz2QGiUKFvOmLr+oxhjGWT6bQ8dYvlbo4Ve4bkZsJfoP3bV6 2RYROJeP7wVwX1XvCIIZjSo4GM5hmef5CnmuMqdvLkJ84jbLUi5i2YmEwU9rOg4dh+ti B0cg== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@infradead.org header.s=twosheds.20170209 header.b=r3MBPyp/; spf=pass (google.com: best guess record for domain of batv+c81c304d53d4f47de05e+5268+infradead.org+dwmw2@twosheds.srs.infradead.org designates 2001:8b0:10b:1:21d:7dff:fe04:dbe2 as permitted sender) smtp.mailfrom=BATV+c81c304d53d4f47de05e+5268+infradead.org+dwmw2@twosheds.srs.infradead.org Authentication-Results: mx.google.com; dkim=pass header.i=@infradead.org header.s=twosheds.20170209 header.b=r3MBPyp/; spf=pass (google.com: best guess record for domain of batv+c81c304d53d4f47de05e+5268+infradead.org+dwmw2@twosheds.srs.infradead.org designates 2001:8b0:10b:1:21d:7dff:fe04:dbe2 as permitted sender) smtp.mailfrom=BATV+c81c304d53d4f47de05e+5268+infradead.org+dwmw2@twosheds.srs.infradead.org Message-ID: <1516882315.30244.88.camel@infradead.org> Subject: Re: [PATCH v4 7/7] x86/speculation: Add basic IBPB (Indirect Branch Prediction Barrier) support From: David Woodhouse To: Borislav Petkov Cc: arjan@linux.intel.com, tglx@linutronix.de, karahmed@amazon.de, x86@kernel.org, linux-kernel@vger.kernel.org, tim.c.chen@linux.intel.com, peterz@infradead.org, pbonzini@redhat.com, ak@linux.intel.com, torvalds@linux-foundation.org, gregkh@linux-foundation.org, dave.hansen@intel.com, gnomes@lxorguk.ukuu.org.uk, ashok.raj@intel.com, mingo@kernel.org In-Reply-To: <20180125120348.ss62p5yaviemprxn@pd.tnic> References: <1516872189-16577-1-git-send-email-dwmw@amazon.co.uk> <1516872189-16577-8-git-send-email-dwmw@amazon.co.uk> <20180125114127.5iw4vy56bb2cs5mr@pd.tnic> <1516880855.30244.78.camel@infradead.org> <20180125115016.ov72ajqb6z7scdrc@pd.tnic> <1516881500.30244.83.camel@infradead.org> <20180125120348.ss62p5yaviemprxn@pd.tnic> Face: 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 Content-Type: multipart/signed; micalg="sha-256"; protocol="application/x-pkcs7-signature"; boundary="=-SiROhKKttaLEwk/loGxx" Date: Thu, 25 Jan 2018 12:11:55 +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?1590556144645656370?= X-GMAIL-MSGID: =?utf-8?q?1590566409151094357?= X-Mailing-List: linux-kernel@vger.kernel.org List-ID: --=-SiROhKKttaLEwk/loGxx Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Thu, 2018-01-25 at 13:03 +0100, Borislav Petkov wrote: > On Thu, Jan 25, 2018 at 11:58:20AM +0000, David Woodhouse wrote: > > They're immediates, not registers. So it's like the first example > in... >=20 > Oh, I know very well what they are - I simply find the macro more > readable if there are less or no arguments. Oh, I agree, but having to write 0x49 there instead of MSR_IA32_PRED_CMD was a more pressing reason *not* to change it. There are possibly macro hacks that can make that work (the first na=C3=AFv= e attempt didn't) but it exceeded my boredom threshold fairly rapidly. If you send me a version which still uses MSR_IA32_PRED_CMD and PRED_CMD_IBPB instead of hard-coding the numbers, and which doesn't end up with piles of __stringify() and similar crap to do so, I'll happily change it. --=-SiROhKKttaLEwk/loGxx 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 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