From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Google-Smtp-Source: AH8x225SPg1TH+7UtZy7Zj3diTTz9eYTy+JtDeXsXll+uAH8glEltt00EeTQpmk2HB9JjMLpcVaj ARC-Seal: i=1; a=rsa-sha256; t=1516733332; cv=none; d=google.com; s=arc-20160816; b=HWkvXMYYPicijdvwPUIENxgpdU5Eh8Ft3wuynhgjVtPzaNH2BQjCv6k0IP2Wj731S8 4aDn8Tr3B0UIHGFWwxe/SZCtsMpf7iIoJIQaEZ5WD8Ef+Yjg0D0ddK+I9MKtS51Xg1O0 YKHEMidjUg4DzXCAhBh/mdF956K3Iuf0kp25eorz6JoTs9tc9pN9Chdv8WvmLmfvRzgW vooRUk2tIWTKOSAAOU1L5m+HgmRElLrJAv9xU7rMVn0FOgKt88UEtdS0SobjWOoeVoW+ V1HRkXwW4i0xJzMhmXvtp9P7GnRtdXxr6IStDl8jR51bMRZ9eyO1tN9WGAMY7m2paXD4 0ebA== 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=eW3/m4egviWKzBj12qIxo+a/iTszTFqDXyqraWFyo3c=; b=AeDInL0fdBHR5XHHZqZHvswtJD8W7NoQlx4lEECYuHMMbMTLiQmDkkqtvsXhaKlsHE a44EthvvyPZbECVxdUY7lcgQcGy7Ih1WkUuUlmsVpbAWskRnGlIA7WAEedgB+Z2hcVu0 QtxsXkFgJDmxqMYBXKaKvpCf79QA3OxxvyJFhqaHw2PyUlHKHT7qM4kQ0liR4vHvo+4X DvDfZsyF+jYIkhgvSfbcqK4y565Ds1XcT15P8TZ1wsV9a9fnyuvuoCPBHLOva2HFqH+b +mIus7bpewalA03r/P/cgmDbj6Amsog4/V76dTSKbAc8YiGsTVvizgMd8sdoY/21siTz aSyQ== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@amazon.co.uk header.s=amazon201209 header.b=HNADX6hM; spf=pass (google.com: domain of prvs=5548949a8=dwmw@amazon.co.uk designates 207.171.184.25 as permitted sender) smtp.mailfrom=prvs=5548949a8=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=HNADX6hM; spf=pass (google.com: domain of prvs=5548949a8=dwmw@amazon.co.uk designates 207.171.184.25 as permitted sender) smtp.mailfrom=prvs=5548949a8=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="5.46,402,1511827200"; d="p7s'?scan'208";a="720691878" Content-Type: multipart/mixed; boundary="===============0105065124044881605==" 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 5/5] x86/pti: Do not enable PTI on fixed Intel processors Thread-Topic: [PATCH v2 5/5] x86/pti: Do not enable PTI on fixed Intel processors Thread-Index: AQHTlHm8M/82XonaG0upy6BGl9IV8aOBy4qA Date: Tue, 23 Jan 2018 18:44:49 +0000 Message-ID: <1516733089.9521.162.camel@amazon.co.uk> References: <1516726375-25168-1-git-send-email-dwmw@amazon.co.uk> <1516726375-25168-6-git-send-email-dwmw@amazon.co.uk> <736fa9c9-d651-b6ef-802c-d02a27c28ab9@intel.com> In-Reply-To: <736fa9c9-d651-b6ef-802c-d02a27c28ab9@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: [10.43.61.91] MIME-Version: 1.0 X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: =?utf-8?q?1590402913825670017?= X-GMAIL-MSGID: =?utf-8?q?1590410170592649318?= X-Mailing-List: linux-kernel@vger.kernel.org List-ID: --===============0105065124044881605== Content-Language: en-US Content-Type: multipart/signed; micalg=sha-256; protocol="application/x-pkcs7-signature"; boundary="=-YO4GaE/Tdn0pblbsILMu" --=-YO4GaE/Tdn0pblbsILMu Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Tue, 2018-01-23 at 10:41 -0800, Dave Hansen wrote: > On 01/23/2018 08:52 AM, David Woodhouse wrote: > > When they advertise the IA32_ARCH_CAPABILITIES MSR and it has the RDCL_= NO > > bit set, they don't need KPTI either. >=20 > Also, I hate to ask...=C2=A0 Have you tested this patch? Nope. I deliberately haven't implemented IBRS_ALL because I have no suitable hardware for that and there are some non-trivial parts, but this one really *should* be trivial so seemed OK to do without hardware. --=-YO4GaE/Tdn0pblbsILMu 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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