From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Google-Smtp-Source: AH8x224l7r4dHZ6W8gICpIOBxstSu4TI9e5/N4FmMehhBzC0vsJBT1/BHeqbEoEA6khj1/Op5lke ARC-Seal: i=1; a=rsa-sha256; t=1516781605; cv=none; d=google.com; s=arc-20160816; b=v9MgKwyaZiBOLjSVNH81fFqXCW8UYn2sw9DUQJ+WCg+5ljGUa0MfHsucyPR6X5h90n SvMk7t3ZAVeQLphdU5FFCVM4Sk/mgfnRzJnbvcRTxrqSMz6LX4NjY7CO5gNNzN49rQuh m/NzhrL+Hvw+JGlhapiU6hwK4t51ZST4feZTOTy1Fzo8JQ1dlIWWkBViHj0nCooIKlVu tcZCKggb+AHSVOcA7MLBifwjD7yWHF9kVH/K5VLmTSk2M4u/F/7Nqh1ZLrsUulqBdIxZ LSub/9CfvM3i/a+SUt6hEH9hU3AF9aqAwLq5mUo+/Bu+EK620Jw1Fg31kYahGECHp2MH +AiA== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=precedence:mime-version:accept-language:in-reply-to:references :message-id:date:thread-index:thread-topic:subject:to:from :mime-version:dkim-signature:arc-authentication-results; bh=u1ot1oBMUqOA96q4lO6FXrZM8/wMFdikszV4eZmDW1o=; b=aXAtWMSa9IW+S053BA8/pKkOTcV7FQqrMLfMg1S7T94mWqaMj07yohyZn43qzLh/+W xv0v+oSfkuL90blPDPsj+o5L+L9b0C3L3VPNF4wignCtL7Ypzq4uaAnVEq/qKkmGUu99 XOHbuwFX9NQ4EXW2UCLNr3WE3q9IFtTy5fSdlGl6iYs2Rfgjgq4cs4/8nsc9w67zj6kF lNe1WAOxrGj1r74Yx+QV4GRp/LwZVvyKCVUhiBdMFImon7huuhFx/RrUhUFtSFEy8FxE R4TuET2ji5DGm/Cbwx4HhkRomTxFH6NFnKrxb1oe5+PCLa9eV7/ojd8Svr+JlTie6aoJ ZoqQ== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@amazon.co.uk header.s=amazon201209 header.b=XARaKF0c; spf=pass (google.com: domain of prvs=555ed1b39=dwmw@amazon.co.uk designates 52.95.49.90 as permitted sender) smtp.mailfrom=prvs=555ed1b39=dwmw@amazon.co.uk; dmarc=pass (p=QUARANTINE sp=QUARANTINE dis=NONE) header.from=amazon.co.uk Authentication-Results: mx.google.com; dkim=pass header.i=@amazon.co.uk header.s=amazon201209 header.b=XARaKF0c; spf=pass (google.com: domain of prvs=555ed1b39=dwmw@amazon.co.uk designates 52.95.49.90 as permitted sender) smtp.mailfrom=prvs=555ed1b39=dwmw@amazon.co.uk; dmarc=pass (p=QUARANTINE sp=QUARANTINE dis=NONE) header.from=amazon.co.uk X-Amazon-filename: smime.p7s X-IronPort-AV: E=Sophos;i="5.46,406,1511827200"; d="p7s'?scan'208";a="328893458" Content-Type: multipart/mixed; boundary="===============4638934728512667969==" MIME-Version: 1.0 From: "Woodhouse, David" To: "linux-kernel@vger.kernel.org" , "peterz@infradead.org" , "arjan@linux.intel.com" , "Raslan, KarimAllah" , "torvalds@linux-foundation.org" , "tim.c.chen@linux.intel.com" , "tglx@linutronix.de" , "ak@linux.intel.com" , "x86@kernel.org" , "pbonzini@redhat.com" , "bp@alien8.de" , "dave.hansen@intel.com" , "thomas.lendacky@amd.com" , "gregkh@linux-foundation.org" Subject: Re: [PATCH v2 2/5] x86/cpufeatures: Add Intel feature bits for Speculation Control Thread-Topic: [PATCH v2 2/5] x86/cpufeatures: Add Intel feature bits for Speculation Control Thread-Index: AQHTlHoEhKppnUcSsk6waSUDNqO386OCOw6AgAABS4CAAHECgA== Date: Wed, 24 Jan 2018 08:13:04 +0000 Message-ID: <1516781583.13558.76.camel@amazon.co.uk> References: <1516726375-25168-1-git-send-email-dwmw@amazon.co.uk> <1516726375-25168-3-git-send-email-dwmw@amazon.co.uk> <3ebee57a-b116-68f6-0421-0640f5e552f5@intel.com> <1516757037.13558.65.camel@amazon.co.uk> In-Reply-To: Accept-Language: en-GB, en-US X-MS-Has-Attach: yes X-MS-TNEF-Correlator: x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [10.43.61.91] MIME-Version: 1.0 X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: =?utf-8?q?1590402900695283949?= X-GMAIL-MSGID: =?utf-8?q?1590460788587409819?= X-Mailing-List: linux-kernel@vger.kernel.org List-ID: --===============4638934728512667969== Content-Language: en-US Content-Type: multipart/signed; micalg=sha-256; protocol="application/x-pkcs7-signature"; boundary="=-Xqbl3qYx72nbiZEAlxKi" --=-Xqbl3qYx72nbiZEAlxKi Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Tue, 2018-01-23 at 17:28 -0800, Dave Hansen wrote: > On 01/23/2018 05:23 PM, Woodhouse, David wrote: > >=20 > > On Tue, 2018-01-23 at 10:43 -0800, Dave Hansen wrote: > ... > >=20 > > >=20 > > > >=20 > > > > =C2=A0 /* Intel-defined CPU features, CPUID level 0x00000007:0 (EDX= ), word 18 */ > > > > =C2=A0 #define X86_FEATURE_AVX512_4VNNIW=C2=A0=C2=A0=C2=A0=C2=A0(18= *32+ 2) /* AVX-512 Neural Network Instructions */ > > > > =C2=A0 #define X86_FEATURE_AVX512_4FMAPS=C2=A0=C2=A0=C2=A0=C2=A0(18= *32+ 3) /* AVX-512 Multiply Accumulation Single precision */ > > > > +#define X86_FEATURE_SPEC_CTRL=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0= =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0(18*32+26) /* S= peculation Control (IBRS + IBPB) */ > > > > +#define X86_FEATURE_STIBP=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0(18*32+27) /* Single Thread Indirect Branc= h Predictors */ > > > > +#define X86_FEATURE_ARCH_CAPABILITIES=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0=C2=A0=C2=A0(18*32+29) /* IA32_ARCH_CAPABILITIES MSR (Intel) */ > > > Should we be adding flags (STIBP) for which we currently have no user= in > > > the kernel? > > They're in an existing word (now) so it costs us absolutely nothing to > > do so. And they'll be exposed to KVM guests in imminent patches if > > nothing else. > > Doesn't just defining it here generate something in the tables that then > get exported in /proc/cpuinfo?=C2=A0=C2=A0That's far from our most strict= ABI, but > a single #define here can be seen by users IIRC. That's true, but still we're *working* on exposing and using these; let's not go wild adding one feature at a time and having to tweak the surrounding blacklist/enable/disable/expose logic at every step. --=-Xqbl3qYx72nbiZEAlxKi Content-Type: application/x-pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCEE4w ggUuMIIEFqADAgECAhEApEtL31g6H7ROXdOiQnA9RjANBgkqhkiG9w0BAQsFADCBlzELMAkGA1UE BhMCR0IxGzAZBgNVBAgTEkdyZWF0ZXIgTWFuY2hlc3RlcjEQMA4GA1UEBxMHU2FsZm9yZDEaMBgG A1UEChMRQ09NT0RPIENBIExpbWl0ZWQxPTA7BgNVBAMTNENPTU9ETyBSU0EgQ2xpZW50IEF1dGhl bnRpY2F0aW9uIGFuZCBTZWN1cmUgRW1haWwgQ0EwHhcNMTcxMjIxMDAwMDAwWhcNMTgxMjIxMjM1 OTU5WjAiMSAwHgYJKoZIhvcNAQkBFhFkd213QGFtYXpvbi5jby51azCCASIwDQYJKoZIhvcNAQEB BQADggEPADCCAQoCggEBAKdGKgXuwKMg2r+i/4BZZC0ddRxNq3xIKTakie/VCSzoO7P17A36ZzUc VMEYPfqDt/65xoc6Tdih+qkY2pNDppZ1DZ8mVrAX6O2O60ZhmXB60wMoDvXPZInvkMOW4drqnje/ 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