From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Google-Smtp-Source: AH8x225xEKL1zhCx54liBLOM8yxYGsbnf/8m1kTUC/XhseAOD1YxMkRaq4OlZVRXscue7+kv8DU0 ARC-Seal: i=1; a=rsa-sha256; t=1516874219; cv=none; d=google.com; s=arc-20160816; b=KTg8QGbw7OAse0SoNMB3tUE5vHZBsI3hz7R+co2LZqOkRjC6mJoIQxVOK7Vdqmsq15 AxbDZIHFjOzS+GHSRFfa6b7nXYd/i/c0AuRWx4RGaXvcZfRxG5mwwQtigcXPMA7BoRRz cITWIabSPkTnvNAp5xX4kX6BsgJ5sd9xZBa2WPoGXbdMYmS1+u+h8ozWmuNRoC53iB0G aHYFU1Z2rby2V3ldX68d82btBeeRTknUIvH1qJVELBDzZQzIR9SO2Lk4gUf/72d2daKp YAN8YVbMV3jsNU2g4AoyXmbwQHb+WUaFTe/gMgkdA3zv4IQurbTuY9HlyuPY2H1uy7s2 duaw== 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=Q5zqn6nZ0bmxtu3vk0dlQpAyBB4F7yKPyABcSof/Plw=; b=mH3p/MStxf+dva90Zc5Ajh4Mg3zmKV+3ajFM4lpDkv8JDTrlL5iewTkz2fqOmrAP/Y Zv7UPa2ejRwL/EywHxC5vS0CXnbO+9J7MS+al9Yd4+8WYHg4+Y8H6Aqz/MUBZwmYMXnq whXga4Jt9WG4h4rykEd/Ue7TeLftIHY3E0dcMHZqfOPokmSZ9eKsF4kFu1LjjaaGfw0P Rh93mRcMYTM1biGpl2ENsc/Ikkj52T67OKn91BxmW9SgWSBnMcmDQszv1TgMj8X6vChq 46GrpIGc4LutcHi87qYOySIJtM/LMgsbOT99NXJnFQorMneAUdtA9GT4A2QLh2iAQG3D dkGQ== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@infradead.org header.s=twosheds.20170209 header.b=jnzKIvqV; spf=pass (google.com: best guess record for domain of batv+c81c304d53d4f47de05e+5268+infradead.org+dwmw2@twosheds.srs.infradead.org designates 2001:8b0:10b:1:21d:7dff:fe04:dbe2 as permitted sender) smtp.mailfrom=BATV+c81c304d53d4f47de05e+5268+infradead.org+dwmw2@twosheds.srs.infradead.org Authentication-Results: mx.google.com; dkim=pass header.i=@infradead.org header.s=twosheds.20170209 header.b=jnzKIvqV; spf=pass (google.com: best guess record for domain of batv+c81c304d53d4f47de05e+5268+infradead.org+dwmw2@twosheds.srs.infradead.org designates 2001:8b0:10b:1:21d:7dff:fe04:dbe2 as permitted sender) smtp.mailfrom=BATV+c81c304d53d4f47de05e+5268+infradead.org+dwmw2@twosheds.srs.infradead.org Message-ID: <1516874209.30244.38.camel@infradead.org> Subject: Re: [PATCH v4 5/7] x86/pti: Do not enable PTI on processors which are not vulnerable to Meltdown From: David Woodhouse To: Peter Zijlstra Cc: arjan@linux.intel.com, tglx@linutronix.de, karahmed@amazon.de, x86@kernel.org, linux-kernel@vger.kernel.org, tim.c.chen@linux.intel.com, bp@alien8.de, pbonzini@redhat.com, ak@linux.intel.com, torvalds@linux-foundation.org, gregkh@linux-foundation.org, dave.hansen@intel.com, gnomes@lxorguk.ukuu.org.uk, ashok.raj@intel.com, mingo@kernel.org In-Reply-To: <20180125094258.GZ2228@hirez.programming.kicks-ass.net> References: <1516872189-16577-1-git-send-email-dwmw@amazon.co.uk> <1516872189-16577-6-git-send-email-dwmw@amazon.co.uk> <20180125094258.GZ2228@hirez.programming.kicks-ass.net> Face: 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 Content-Type: multipart/signed; micalg="sha-256"; protocol="application/x-pkcs7-signature"; boundary="=-WRSvXQ+Pzc7/VDbnxoXP" Date: Thu, 25 Jan 2018 09:56:49 +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?1590555846213033818?= X-GMAIL-MSGID: =?utf-8?q?1590557901609326066?= X-Mailing-List: linux-kernel@vger.kernel.org List-ID: --=-WRSvXQ+Pzc7/VDbnxoXP Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Thu, 2018-01-25 at 10:42 +0100, Peter Zijlstra wrote: > On Thu, Jan 25, 2018 at 09:23:07AM +0000, David Woodhouse wrote: > > +static bool __init early_cpu_vulnerable_meltdown(struct cpuinfo_x86 *c= ) > > +{ > > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0u64 ia32_cap =3D 0; > > + > > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0if (x86_match_cpu(cpu_no_meltdown)) > > +=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 return false; > > + > > +=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0if (cpu_has(c, X86_FEATURE_ARCH_CAPABILI= TIES)) > > +=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=A0rdmsrl(MSR_IA32_ARCH_CAPABILITIES, ia32_cap); >=20 > I think it was suggested a while back to write this like: >=20 > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0if (cpu_has(c, X86_FEATUR= E_ARCH_CAPABILITIES) && > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 !rdmsr= l_safe(MSR_IA32_ARCH_CAPABILITIES, ia32_cap)) >=20 > to deal with funny virt scenarios where they accidentally advertise the > CPUID bit but don't in fact provide the MSR. It was indeed suggested, but I was a bit confused by that. Because the CPUID bit exists *purely* to advertise the existence of that MSR; nothing more. If it doesn't exist we'll end up with zero in ia32_cap anyway, which will mean we *won't* see the RDCL_NO bit, and won't disable the Meltdown flag. --=-WRSvXQ+Pzc7/VDbnxoXP 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 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