From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Google-Smtp-Source: AH8x226BHGDM5s1W/FllyXthhPplxK5AwCO5F41oa8yWRFBeUjhQI/pp6HJyQuf5MqKsiScI+kkI ARC-Seal: i=1; a=rsa-sha256; t=1516757049; cv=none; d=google.com; s=arc-20160816; b=rZXTo3fqo/0UXe/SYiO0HBKOnADdVxc7/HTVMhPKijB5PI3io9icO2HHQQWPJLAHM5 Y+ONpknsMGkNTsQ4ubup8S0ngoteBlDgrOQjg6bVhetGE0f6MfGvrvohqoYKwYdlKnXD 5k39Cqq76zy5+HbPET+HaNPSlPX3H0XAB+qUOkwlHDtfzn6HxJNjEth8fjKyrEzWUnx2 Yy8hEDUaE0lJvm/hwT9IGpTd1iZgPVJXPGRkM94eCcs3ZsXAwB/XJ8Ob1I/VU5M3gAUj 5aX3l+0QsnFJ63LjOph1owD8bwgxUToevkxkWtv/D3ApzR/ZHOC8WyNUsPOPBqmCzWgh c8Mg== 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=7nWxN6EB1xjJs/gMw6QfSa9qYH+2NqYrpNw4bEc7BZE=; b=LpAbdstfGZbrl3JfgoljwugglB+mVipeeHY+q3t6N0RiEtMtwtVGLkZleh1qrlQPUW TIz2KDAGw6UjoY43tpub90w6cdtci+8h1aLSs85VBEwXm9RLb304/4WMr3BKuEJmo2sN FbspW8bdM9hp3f0AV0US1/LjFp+Blm5c/83EZJ3kPuS8miS+XltvtU/nABXRLqiotf+B a/Tta5JQuFHgl+HjNDS5dOPuPBC1I8mnRiSRAaWPyQT1dFx3gVSFdpm/05DcRbbAqpT/ j9anzlHPocwn6QGD+SkO2/+jcJYrmv7FF1al3IKqxdVNE1IbmQhWjiHfPSSoe/kGajZu qpfg== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@amazon.co.uk header.s=amazon201209 header.b=Vpc9kVh+; spf=pass (google.com: domain of prvs=555ed1b39=dwmw@amazon.co.uk designates 207.171.184.29 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=Vpc9kVh+; spf=pass (google.com: domain of prvs=555ed1b39=dwmw@amazon.co.uk designates 207.171.184.29 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="5.46,404,1511827200"; d="p7s'?scan'208";a="589326968" Content-Type: multipart/mixed; boundary="===============7733866197323546756==" MIME-Version: 1.0 From: "Woodhouse, David" To: "linux-kernel@vger.kernel.org" , "tim.c.chen@linux.intel.com" , "arjan@linux.intel.com" , "Raslan, KarimAllah" , "peterz@infradead.org" , "torvalds@linux-foundation.org" , "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: AQHTlHoEhKppnUcSsk6waSUDNqO386OCOw6A Date: Wed, 24 Jan 2018 01:23:58 +0000 Message-ID: <1516757037.13558.65.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> In-Reply-To: <3ebee57a-b116-68f6-0421-0640f5e552f5@intel.com> Accept-Language: en-GB, en-US X-MS-Has-Attach: yes X-MS-TNEF-Correlator: x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [10.43.62.4] MIME-Version: 1.0 X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: =?utf-8?q?1590402900695283949?= X-GMAIL-MSGID: =?utf-8?q?1590435039589981940?= X-Mailing-List: linux-kernel@vger.kernel.org List-ID: --===============7733866197323546756== Content-Language: en-US Content-Type: multipart/signed; micalg=sha-256; protocol="application/x-pkcs7-signature"; boundary="=-kIDUQebA7FyCSXRbaZri" --=-kIDUQebA7FyCSXRbaZri Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Tue, 2018-01-23 at 10:43 -0800, Dave Hansen wrote: > On 01/23/2018 08:52 AM, David Woodhouse wrote: > >=C2=A0 > > diff --git a/arch/x86/include/asm/cpufeatures.h b/arch/x86/include/asm/= cpufeatures.h > > index 7b25cf3..0a51070 100644 > > --- a/arch/x86/include/asm/cpufeatures.h > > +++ b/arch/x86/include/asm/cpufeatures.h > > @@ -320,6 +320,9 @@ > >=C2=A0 /* Intel-defined CPU features, CPUID level 0x00000007:0 (EDX), wo= rd 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) /* Spec= ulation 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 Branch Pred= ictors */ > > +#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) */ >=20 > 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. 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