From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Google-Smtp-Source: AH8x227CjnpxmNqU/IBcB0dJ/EDmhEQLsuOj4ANnVIFPk73eDdEV+crgYPstnNymeD2D2vM/wDSq ARC-Seal: i=1; a=rsa-sha256; t=1516479308; cv=none; d=google.com; s=arc-20160816; b=JSTxPM1BTaO480X4zN9KtgLv6qHI3lphVBjZK6KirsH7ABYnrLOJKfjVHmeZiE8MsW 3JI2X9Tljdb1N23tIePmfv+mgvtcK9UgHp3ZAjfVCC4cgi8debflvo6T6J0szRawsnpw sPgz4iqOZ8MCTYV/so/d/gBXKT5OSCTvOcCZwbja8buvLJiHjMWMUQN6UNISEBrCbPF5 he9Y0sovqTyvlUdd+jdy7/iEh55CEoLeiPdettqa7rzVFlkY+owURMyODkOCNClp9Z2a sE0HqHzXFrMQ6gLhOksJr3OnIu68dSYSiXVTM+DPUpeJGurI2MQBPAA9rJ84Wjsm+xFO qnlQ== 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:cc:to:from :mime-version:dkim-signature:arc-authentication-results; bh=CtUP0jq8IgAePHPSY3WkrDSLRTFKmrSgDcB8vwHTuyo=; b=ga6bh8VnU7UQT3ywKmluD05L0FOSZqzf1UdfVvDi6mL8VDyLDz7A/ZGYOk0Tjk/ELw UOUbCAy47CXTeVJ1bn+mhaa4uczwe8Zc0YRkHASJki4tqW5s32BC/nCzjVSowLa9NeHt WL2jf7pxrhRrcPUMD0HyoALuU49UHrwvalMw+0uhdog5eNN4LztjFm0X8E7O1bOd9Igc AIcRW9FixwtnfTrui0K1J6Plh9g8M32dj99uVl/giw2KUqIimSIB2iGu3E0SuePj0g15 BwsWJTZ6aPzxDdoJJJ9e1to3uoeBxEUmLhMMVddhXXyk3gwBZjLtQ01L93aujdLXoDtg 6POA== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@amazon.co.uk header.s=amazon201209 header.b=Yqkqmc8c; spf=pass (google.com: domain of prvs=551c774c9=dwmw@amazon.co.uk designates 207.171.184.25 as permitted sender) smtp.mailfrom=prvs=551c774c9=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=Yqkqmc8c; spf=pass (google.com: domain of prvs=551c774c9=dwmw@amazon.co.uk designates 207.171.184.25 as permitted sender) smtp.mailfrom=prvs=551c774c9=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="5.46,387,1511827200"; d="p7s'?scan'208";a="720492842" Content-Type: multipart/mixed; boundary="===============5444684697652294469==" MIME-Version: 1.0 From: "Woodhouse, David" To: "tglx@linutronix.de" CC: "linux-kernel@vger.kernel.org" , "peterz@infradead.org" , "arjan@linux.intel.com" , "Raslan, KarimAllah" , "torvalds@linux-foundation.org" , "tim.c.chen@linux.intel.com" , "ak@linux.intel.com" , "x86@kernel.org" , "pbonzini@redhat.com" , "bp@alien8.de" , "gregkh@linux-foundation.org" Subject: Re: [PATCH 4/4] x86/pti: Do not enable PTI on fixed Intel processors Thread-Topic: [PATCH 4/4] x86/pti: Do not enable PTI on fixed Intel processors Thread-Index: AQHTkipp7yHJ4tP1G0Suy5MxICy8J6N9MduA Date: Sat, 20 Jan 2018 20:13:12 +0000 Message-ID: <1516479191.9814.4.camel@amazon.co.uk> References: <1516449813-7654-1-git-send-email-dwmw@amazon.co.uk> <1516449813-7654-5-git-send-email-dwmw@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: [10.43.62.4] MIME-Version: 1.0 X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: =?utf-8?q?1590113012988085522?= X-GMAIL-MSGID: =?utf-8?q?1590143808142218717?= X-Mailing-List: linux-kernel@vger.kernel.org List-ID: --===============5444684697652294469== Content-Language: en-US Content-Type: multipart/signed; micalg=sha-256; protocol="application/x-pkcs7-signature"; boundary="=-NNHBiLJsXTugH2StvaPK" --=-NNHBiLJsXTugH2StvaPK Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Sat, 2018-01-20 at 21:08 +0100, Thomas Gleixner wrote: > On Sat, 20 Jan 2018, David Woodhouse wrote: >=20 > > When they advertise the IA32_ARCH_CAPABILITIES MSR and it has the RDCL_= NO > > bit set, they don't need KPTI either. >=20 > Do they exist today? And do we have documentation for that new MSR alread= y? No and yes: https://software.intel.com/sites/default/files/managed/c5/63/336996-Specula= tive-Execution-Side-Channel-Mitigations.pdf --=-NNHBiLJsXTugH2StvaPK 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/ 7/NOypn/XQAY+ln4KT+3tHG3TfryyJFMedqC/r29KJlCeeCxIzdtq2j5mN42tvPVv4+p+Kr77uui 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