From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Google-Smtp-Source: AH8x227PVM2NJhEbBp/Cv+GXJBEDcl1kHl8AY4mdh3ZwfGn9pmBJCE9kbmrjqbJvG8SCFWHwC4WI ARC-Seal: i=1; a=rsa-sha256; t=1516881512; cv=none; d=google.com; s=arc-20160816; b=bWovbhyKUHgJ7eargmQOlM7repayLX112lnFu64QwYxYQQEhNRrFJuGkEkykJIyr3m UnRsuD/cJHFcX1G31qmhMWOBQGoopvvgKB7A4idCDaY7Xyn7u4CcqOsYxz5Z1rA6688t CSHhJtRJ8dSU+hQXG+KJFdfgTu6wg1Wn2aF4Pc3vdlHN7MnJ3XWujxy64x9pGVW0WQr7 PN/Z6C2S38bciCo7u0zFBcMvqZY3os7Tr2fCOlKFZe09dalxoaC6vrzyC/v6i52QOM1m 8/JMWrJ620hvutXinBGMOp7Q5cyjnEx6WEr+wptiMWdo0I5Nhq8WoJ3OXKKjW9A3Ta8n CUWQ== 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=+zE3WOTPeQHGpxiIidgmZRDs+AJvSZnk0J0sxCtobqw=; b=wJXjwwUPlFqGztg3drrSZ39tuQHU91y8W9Z6tt/g2VG0vzfKII2RxVKsXYu9TZozXg mBBXE4htM7hdV76mAPCuwb1X1Gh+Py8LEjXawkRyh54FSF0ZM1baSgMP6Ln6NkfJ4kGH RggHrpoAyWpYRUGCOdpLxJ8DyKan+ZOcjKNnjkyy+WYsiMp4pSGWA8AC01azZa89UybX ovI/H4YbrQlvJqyF3NJIBoji+MTJ0+IxhEHcVskLGPP+713WtlPChXFYEddz6+b5g2Vp p7MNhzor81T9O+DeMMKH8S+9pttDqlzAUyKPkmNfCjpGRi6bt3jWxpl13Zf2ljO5yShF 1Fcw== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@infradead.org header.s=twosheds.20170209 header.b=BCDmERBE; 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=BCDmERBE; 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: <1516881500.30244.83.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: <20180125115016.ov72ajqb6z7scdrc@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> Face: 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 Content-Type: multipart/signed; micalg="sha-256"; protocol="application/x-pkcs7-signature"; boundary="=-cmwsurHOnAEgR2E4Q5Rq" Date: Thu, 25 Jan 2018 11:58:20 +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?1590565548129728859?= X-Mailing-List: linux-kernel@vger.kernel.org List-ID: --=-cmwsurHOnAEgR2E4Q5Rq Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Thu, 2018-01-25 at 12:50 +0100, Borislav Petkov wrote: > On Thu, Jan 25, 2018 at 11:47:35AM +0000, David Woodhouse wrote: > > I did already do the explicit clobbers now you reminded me how to do > > them, but I elected not to use ASM_NO_INPUT_CLOBBER() because on > > balance, losing the MSR_IA32_PRED_CMD / PRED_CMD_IBPB definitions and > > having to hard-code the numbers was not so much of a win. >=20 > and I'm thinking exactly the opposite: if an alternative can lose a > bunch of inputs which don't change, then that's a good thing. They're immediates, not registers. So it's like the first example in... void foo(void) { asm volatile ("alternative me away; my numbers are %0 and %1\n" =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0:: "i" (3456), "i" (1234)); asm volatile ("alternative me away; GCC already loaded regs %0 and %1\n" =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0:: "c" (3456), "a" (1234)); } ... which gives you... foo: .LFB0: .cfi_startproc #APP # 4 "foo.c" 1 alternative me away; my numbers are $3456 and $1234 # 0 "" 2 #NO_APP movl $1234, %eax movl $3456, %ecx #APP # 7 "foo.c" 1 alternative me away; GCC already loaded regs %ecx and %eax # 0 "" 2 #NO_APP ret .cfi_endproc --=-cmwsurHOnAEgR2E4Q5Rq Content-Type: application/x-pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCEFQw ggUxMIIEGaADAgECAhBNRhEyk/HZ7naOeTHWrzuAMA0GCSqGSIb3DQEBCwUAMIGXMQswCQYDVQQG 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