From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Google-Smtp-Source: AH8x227ms8+HyS3Dx3jyZMhB/KxLdFUmghg1cX97zuAXyn2mvbqRxR5wC8yN2u/Hd9Rwj+LBTvbP ARC-Seal: i=1; a=rsa-sha256; t=1517908518; cv=none; d=google.com; s=arc-20160816; b=Ik0tDj4uNHY2UGSBEi+Fy1Iz9JlP+dl1eW/D+3xMgEIvrLFJmCGonUlmNSmDC1J1S9 +xfN3CXnZchKGI/7a5hZVUfPRrtKfU91i+bxeWqyiQGDRlvv3mk2/lxe5I3ZrJKpAS44 BKOz0wLiUrqKeQtqPGL85lyST8nhXK4Z4IxZGd+AOfNzS1nuDqH8gCSFk4puXM4GwoMY BaVZy+PcMkBnP42xJ3a1BcPSYfI50N7Q+uhtPAh1vwOyB2XoDK2ZtDAwVyS8n0HIwxQY KWZ7UwbZTQjGWEDksyAgGYjIxxWFk30JyA8aWU8DZm7ZQS+BxPsxdngMqY3FDFkFWPWl xiVA== 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=JqiTj0LDdqEVquXaao4sjL2cpdKy+bOZeBeU6EoSeXg=; b=LuzpwlbRHB5qnoqBv3akw6bf88ShkZ4eXn5O32u5SVX4AIiZUP1N8cncBJ3NZOaG5R 8lwOeN5D5IPHIDPy8mAu9y0/LC9rwqz4kjnkcBJRHG583M3gvHyfY9g6Chel0sJy+uwN 03eLMxiP7T86OAOpfmQTUpjXa1ed6p88o4272i5SydFMUekIzhGD0pGvX3mZwsRC5LBo bG6a6NmWlUAtAeAOz3efy+Otr0P4XozkDVp4vKvlMr65+tRPJI00OF/AKFfFVaThcOr1 BUlZT5K4RGFFGP0bE941neBpOFnJ+H9k2by50vfyzfDHIMHoarNjTpK6hr0p7VktG/0Z m2AA== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@infradead.org header.s=twosheds.20170209 header.b=KW8u09Wo; spf=pass (google.com: best guess record for domain of batv+77f4f383f85eee7fbfc0+5280+infradead.org+dwmw2@twosheds.srs.infradead.org designates 90.155.92.209 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=KW8u09Wo; spf=pass (google.com: best guess record for domain of batv+77f4f383f85eee7fbfc0+5280+infradead.org+dwmw2@twosheds.srs.infradead.org designates 90.155.92.209 as permitted sender) smtp.mailfrom=BATV+77f4f383f85eee7fbfc0+5280+infradead.org+dwmw2@twosheds.srs.infradead.org Message-ID: <1517908488.31953.198.camel@infradead.org> Subject: Re: [RFC 09/10] x86/enter: Create macros to restrict/unrestrict Indirect Branch Speculation From: David Woodhouse To: Thomas Gleixner , Ingo Molnar Cc: Linus Torvalds , KarimAllah Ahmed , Linux Kernel Mailing List , Andi Kleen , Andrea Arcangeli , Andy Lutomirski , Arjan van de Ven , Ashok Raj , Asit Mallick , Borislav Petkov , Dan Williams , Dave Hansen , Greg Kroah-Hartman , "H . Peter Anvin" , Ingo Molnar , Janakarajan Natarajan , Joerg Roedel , Jun Nakajima , Laura Abbott , Masami Hiramatsu , Paolo Bonzini , Peter Zijlstra , Radim =?UTF-8?Q?Kr=C4=8Dm=C3=A1=C5=99?= , Tim Chen , Tom Lendacky , KVM list , the arch/x86 maintainers , Arjan Van De Ven In-Reply-To: References: <1516476182-5153-10-git-send-email-karahmed@amazon.de> <1516566497.9814.78.camel@infradead.org> <1516572013.9814.109.camel@infradead.org> <1516638426.9521.20.camel@infradead.org> <20180123072930.soz25cyky3u4hpgv@gmail.com> <20180123075358.nztpyxympwfkyi2a@gmail.com> <1516699832.9521.123.camel@infradead.org> <20180123102318.airsvcl5uckguo2z@gmail.com> Face: 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 Content-Type: multipart/signed; micalg="sha-256"; protocol="application/x-pkcs7-signature"; boundary="=-6fBrD9xtQM+ZSF9EkIi1" Date: Tue, 06 Feb 2018 09:14:48 +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?1590140582166248265?= X-GMAIL-MSGID: =?utf-8?q?1591642442779522172?= X-Mailing-List: linux-kernel@vger.kernel.org List-ID: --=-6fBrD9xtQM+ZSF9EkIi1 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Sun, 2018-02-04 at 19:43 +0100, Thomas Gleixner wrote: > Yet another possibility is to avoid the function entry and accouting magi= c > and use the generic gcc return thunk: >=20 > __x86_return_thunk: > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0call L2 > L1: > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0pause > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0lfence > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0jmp L1 > L2: > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0lea 8(%rsp), %rsp|lea 4(%= esp), %esp > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0ret >=20 > which basically refills the RSB on every return. That can be inline or > extern, but in both cases we should be able to patch it out. >=20 > I have no idea how that affects performance, but it might be worthwhile t= o > experiment with that. That was what I had in mind when I asked HJ to add -mfunction-return. I suspect the performance hit would be significant because it would cause a prediction miss on *every* return. But as I said, let's implement what we can without IBRS for Skylake, then we can compare the two options for performance, security coverage and general fugliness. --=-6fBrD9xtQM+ZSF9EkIi1 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 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