From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Google-Smtp-Source: AH8x226BTNlkcvytlMaYvZtRx5NV2gaTGe1lfTmwL1DzKadeE/s4qlWTLsGB6PKdxOEdR0dzxNyT ARC-Seal: i=1; a=rsa-sha256; t=1517959895; cv=none; d=google.com; s=arc-20160816; b=FnKgM9TYThNj3ophLKJ2dHIGiT7SmyIPVoMwzSAMcZlPL8+/WHVBei/wlYP4nqplsC SGnOeGFPeNx1CViP3AfRJpNCHiny7QdsiouvuzUU4JJXlXWsNAAPJwEX5CAYcPPnSaYO yEAxavNaBDBTHW9hIf/7Txq8CJCBbfBL5bHwefpZjPs09Agn9Mu8T9whOFqfWKfxhM3n fZ7ZsAHSZbJReq7T+ri5kLM3vG7hsUN0HYO7gD/5pcugK4t2cVrSKD3xI7Qv/bPkzmcW O+frAaxpSWLVxBGwIP4Tn1JNs4zzvFu3vS1SCw3CuvYIivEjKQpt/E5kRKxEGuFR4pHi Kc6Q== 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=/xkECSETVHsipNciVyjX3NumZCPpwdrKNOH/Id5UqP4=; b=Qauw7BFGHRtXXXrhMPrYwB8vIxQZBL50T6gJT+HV+qCC5uQT5SpzUwGtuwNHpVHkMA +/09J4HchNXGdPugzpN9UnkjZd4EZUgQD81GH6G2z3hzQoIl6tdQf35K4RxiCwCRKnKz M9+ML6w7LR3JcThdh0HfOUoErajZ+AyJOLbcr11aJevKDj/lCR3686LVVQpaczvjEKmM q9jkk6xjLwTUk1bINlUPZaLiypUO3gmRvWAw4ljHbbZ4tFNTXeXKbWbecPT+peMoaHOM CCCeI/biGgd9nv5l94iNPG2N4G0dCF8YbhbyKxOJxXp5yAFYG1bFkUMFOth44y07L+5A /v1g== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@infradead.org header.s=twosheds.20170209 header.b=bC+Re0AU; spf=pass (google.com: best guess record for domain of batv+77f4f383f85eee7fbfc0+5280+infradead.org+dwmw2@twosheds.srs.infradead.org designates 2001:8b0:10b:1:21d:7dff:fe04:dbe2 as permitted sender) smtp.mailfrom=BATV+77f4f383f85eee7fbfc0+5280+infradead.org+dwmw2@twosheds.srs.infradead.org Authentication-Results: mx.google.com; dkim=pass header.i=@infradead.org header.s=twosheds.20170209 header.b=bC+Re0AU; spf=pass (google.com: best guess record for domain of batv+77f4f383f85eee7fbfc0+5280+infradead.org+dwmw2@twosheds.srs.infradead.org designates 2001:8b0:10b:1:21d:7dff:fe04:dbe2 as permitted sender) smtp.mailfrom=BATV+77f4f383f85eee7fbfc0+5280+infradead.org+dwmw2@twosheds.srs.infradead.org Message-ID: <1517959878.3677.54.camel@infradead.org> Subject: Re: [PATCH 2/2] x86/speculation: Simplify indirect_branch_prediction_barrier() From: David Woodhouse To: Josh Poimboeuf Cc: Borislav Petkov , X86 ML , LKML , 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: <20180206232514.qcy4y3dzfkjo3xdg@treble> 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> <1517946292.3677.22.camel@infradead.org> <20180206232514.qcy4y3dzfkjo3xdg@treble> Face: 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 Content-Type: multipart/signed; micalg="sha-256"; protocol="application/x-pkcs7-signature"; boundary="=-wjpsAkV0hX1CULg0qbfG" Date: Tue, 06 Feb 2018 23:31:18 +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?1591696314963032970?= X-Mailing-List: linux-kernel@vger.kernel.org List-ID: --=-wjpsAkV0hX1CULg0qbfG Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Tue, 2018-02-06 at 17:25 -0600, Josh Poimboeuf wrote: > On Tue, Feb 06, 2018 at 07:44:52PM +0000, David Woodhouse wrote: > >=20 > > On Fri, 2018-01-26 at 21:08 +0100, Borislav Petkov wrote: > > >=20 > > > Make it all a function which does the WRMSR instead of having a hairy > > > inline asm. > > ... > >=20 > > >=20 > > > + alternative_input("", > > > + =C2=A0"call __ibp_barrier", > > > + =C2=A0X86_FEATURE_IBPB, > > > + =C2=A0ASM_NO_INPUT_CLOBBER("eax", "ecx", "edx", "memory")); > > > =C2=A0} > > Dammit. I know the best time to comment is *before* I add my own sign- > > off to it and before Linus has merged it but... I think this is broken. > >=20 > > If you're calling a C function then you have to mark *all* the call- > > clobbered registers as, well, clobbered. > >=20 > > If you really really really want to *call* something out of line, then > > it would need to be implemented in asm. > > Hm.=C2=A0=C2=A0In theory I agree this seems like a bug.=C2=A0=C2=A0On x86= _64 I believe we > would need to mark the following registers as clobbered: r8-r11, ax, cx, > dx, si, di, plus "memory" and "cc". >=20 > But I'm scratching my head a bit, because we seem to have this bug all > over the kernel.=C2=A0=C2=A0(Grep for ASM_CALL_CONSTRAINT to see them.) >=20 > Many of those inline asm calls have been around a long time.=C2=A0=C2=A0S= o why > hasn't it ever bitten us? How many are actually calling C functions, not asm or other special cases like firmware entry points? --=-wjpsAkV0hX1CULg0qbfG 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 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