From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Google-Smtp-Source: AH8x225dc5hQ49PU8psHt30AdyGbO385VIQnIozQ99JL7+nhKsNH0UNtpv5CnjqidJjdPSZWmjB9 ARC-Seal: i=1; a=rsa-sha256; t=1517003997; cv=none; d=google.com; s=arc-20160816; b=hwnUvCjTg7wie7oazuc/U1Kc9k7j5NxE3rEP3L2OT6ZzvZJZCdkFxnMxQB6q+FS/lM zZ+mFR/g2H6QTz0kZRYc/YCPnk+cIfSoAa5uIhRFgLGmtClpJRzL3x51Irqp9DHrOsQq 12Z34+gLzkkque/suBW+aSSgvVnMrkZw3niavaG+P9nQHQh6Zt8egZqD/URZRLm/5BJx Z54mbimITmIAQ22WzOmY/Ss45yyADfNnfLb40wnm02h2zz1/WQGRBan6AJTwmoVLAeZD myVTspiY+Qx6gkFVlh986Q22olNzb0sUlbcYQD08iZS3JiK7RtW3z0oicCv0EGjkf9rX APYA== 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=ct/qVFiYrZrrqdNBiFgGjGrHIURxLjZBwfmIYyDvNDA=; b=QQ1YQ7BF7/Csv65odH6R43XSI0fPwOBBRi6FKeZag3S9sfaM7x7Qrq5W8XyrfSbce+ RylNoyRsPnsVcImOQSH6eSCH3rcujIvCLfbewKyww2vaLVtb0XPtpjkV7SonnGOJROjC 5G7S00VFx0Ri2dI9k6BAcbTSvSwn4oA/938rhzkY2IsAnrXPE5eMv+kzM/zFtxwpCS34 xBZzxgcABYSs3hPXF7ijcrQWOGdk3NJezdXLaCRT/rcwpGTa9mSIEVqSDGjWpOhzOfEW kd9ZUYZCTF++Dr6CxEtItqfrcZQQDwThpkJAYN4JO758a3dhaIzNZFS/smT+iaPqzhj1 VBhA== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@infradead.org header.s=twosheds.20170209 header.b=qXUFfzWM; spf=pass (google.com: best guess record for domain of batv+5c899106830c0475ba9f+5269+infradead.org+dwmw2@twosheds.srs.infradead.org designates 2001:8b0:10b:1:21d:7dff:fe04:dbe2 as permitted sender) smtp.mailfrom=BATV+5c899106830c0475ba9f+5269+infradead.org+dwmw2@twosheds.srs.infradead.org Authentication-Results: mx.google.com; dkim=pass header.i=@infradead.org header.s=twosheds.20170209 header.b=qXUFfzWM; spf=pass (google.com: best guess record for domain of batv+5c899106830c0475ba9f+5269+infradead.org+dwmw2@twosheds.srs.infradead.org designates 2001:8b0:10b:1:21d:7dff:fe04:dbe2 as permitted sender) smtp.mailfrom=BATV+5c899106830c0475ba9f+5269+infradead.org+dwmw2@twosheds.srs.infradead.org Message-ID: <1517003984.30244.299.camel@infradead.org> Subject: Re: [PATCH] x86/cpufeatures: Cleanup AMD speculation feature bits From: David Woodhouse To: Borislav Petkov , Tom Lendacky Cc: x86-ml , linux-tip-commits@vger.kernel.org, hpa@zytor.com, gregkh@linuxfoundation.org, tglx@linutronix.de, linux-kernel@vger.kernel.org, mingo@kernel.org In-Reply-To: <20180126215209.vqdxh5p672tcdst6@pd.tnic> References: <1516896855-7642-4-git-send-email-dwmw@amazon.co.uk> <20180126184139.rcfbtk7dvj7kmyfn@pd.tnic> <1516992318.30244.271.camel@infradead.org> <20180126184915.ioqewp56orj2qhrt@pd.tnic> <7094ed9b-40f7-ba2b-55a6-cc5ab0b06bb9@amd.com> <20180126215209.vqdxh5p672tcdst6@pd.tnic> Face: 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 Content-Type: multipart/signed; micalg="sha-256"; protocol="application/x-pkcs7-signature"; boundary="=-d6yrapZIyd68zZ1fo7va" Date: Fri, 26 Jan 2018 21:59:44 +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?1590681520403481900?= X-GMAIL-MSGID: =?utf-8?q?1590693982722838077?= X-Mailing-List: linux-kernel@vger.kernel.org List-ID: --=-d6yrapZIyd68zZ1fo7va Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Fri, 2018-01-26 at 22:52 +0100, Borislav Petkov wrote: > On Fri, Jan 26, 2018 at 03:06:20PM -0600, Tom Lendacky wrote: > >=20 > > So I like the idea of AMD_IBRS/AMD_IBPB/AMD_STIBP and then use the magi= c > > quotes as appropriate.=C2=A0=C2=A0We could probably use the magic quote= s on > > AMD_STIBP and set X86_FEATURE_STIBP when we see X86_FEATURE_AMD_STIBP. > Like this? >=20 > We set the respective Intel features when we detect the AMD ones so that > we get correct /proc/cpuinfo strings. The respective AMD ones are not > shown. >=20 > + > + if (cpu_has(c, X86_FEATURE_AMD_IBRS)) > + set_cpu_cap(c, X86_FEATURE_IBRS); No, there is no X86_FEATURE_IBRS; that was going to be the "we are using IBRS" soft feature, analogous to X86_FEATURE_RETPOLINE and X86_FEATURE_IBPB, actually used for the alternatives. Intel doesn't *have* a feature bit for only IBRS. They have the bit which indicates that *both* the SPEC_CTRL (with IBRS) and PRED_CMD (with IBPB) registers are present. If we wanted to do this kind of thing, we'd do it the other way round. Turn the *Intel* feature into both 'IBRS' and 'IBPB' CPU-visible features, and have those defined in the AMD word. Then use virtual bits with "" for the software features, since we don't want *those* to appear in /proc/cpuinfo. I'll take a look at this in the morning. --=-d6yrapZIyd68zZ1fo7va 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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