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[209.132.180.67]) by mx.google.com with ESMTP id 87si4172165pfl.300.2018.01.24.23.54.27; Wed, 24 Jan 2018 23:54:41 -0800 (PST) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; dkim=fail header.i=@infradead.org header.s=twosheds.20170209 header.b=lAcd8y4F; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751364AbeAYHxx (ORCPT + 99 others); Thu, 25 Jan 2018 02:53:53 -0500 Received: from twosheds.infradead.org ([90.155.92.209]:44386 "EHLO twosheds.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751056AbeAYHxw (ORCPT ); Thu, 25 Jan 2018 02:53:52 -0500 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=twosheds.20170209; h=Mime-Version:Date:Content-Type: References:In-Reply-To:Cc:To:From:Subject:Message-ID:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=St/2Yvn+DnIXguigAXyF4qTlYTt6jqYknmzOzmYuPnY=; b=lAcd8y4FNrEMSncNV8epVA1tb 985UiryeV2aVRfpFJrRs7ZH9Bo/C0pmdEpagMKs9xr+cn56gbU7IEweIW7S0D2ZCXTpoQ4DgQ+NzN NkR/gwtPnrnvCYr1rQ8poLQm30hc/1QHwlMfE2WJ2Tr40JK5mVwmdpMS1H0TGwoJKDVhYepQ2hUWH aPeJYyjvEcsATpu+SzLkfjGXNd7V0svso2YQutErl9w5E0yxJkyrvPZS2vwyVJwjuNkK64jMmBcj5 I2A9joYwWbNjjhjEugPjw4vl8Zcv2dUQI5TNsYPDocg1QW8VSQCUfj/cbiNx3sFCVpGE2MEhxTxVj iZYiSpP4g==; Received: from [2001:8b0:10b:1:88df:f864:4b91:a1c5] by twosheds.infradead.org with esmtpsa (Exim 4.89 #1 (Red Hat Linux)) id 1eecLb-0002UH-2Y; Thu, 25 Jan 2018 07:53:26 +0000 Message-ID: <1516866801.30244.3.camel@infradead.org> Subject: Re: tip/master falls off NOP cliff with KPTI under KVM From: David Woodhouse To: Dexuan-Linux Cui Cc: Alexey Dobriyan , pbonzini@redhat.com, rkrcmar@redhat.com, tglx@linutronix.de, mingo@redhat.com, hpa@zytor.com, dave.hansen@linux.intel.com, linux-kernel@vger.kernel.org, kvm@vger.kernel.org, x86@kernel.org, arjan@linux.intel.com, decui@microsoft.com In-Reply-To: References: <20180110220814.GA29262@avx2> <20180110223457.GA1762@avx2> <1515624823.22302.260.camel@amazon.co.uk> Face: 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 Content-Type: multipart/signed; micalg="sha-256"; protocol="application/x-pkcs7-signature"; boundary="=-MZMOeAYzoIzDtnh/WkmM" Date: Thu, 25 Jan 2018 07:53:21 +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 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --=-MZMOeAYzoIzDtnh/WkmM Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Wed, 2018-01-24 at 16:53 -0800, Dexuan-Linux Cui wrote: > On Wed, Jan 10, 2018 at 2:53 PM, Woodhouse, David wro= te: > >=20 > > On Thu, 2018-01-11 at 01:34 +0300, Alexey Dobriyan wrote: > > >=20 > > >=20 > > > Bisection points to > > >=20 > > > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0f3433c1010c6af61c9897= f0f0447f81b991feac1 is the first bad commit > > > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0commit f3433c1010c6af= 61c9897f0f0447f81b991feac1 > > > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0Author: David Woodhou= se > > > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0Date:=C2=A0=C2=A0=C2= =A0Tue Jan 9 14:43:11 2018 +0000 > > >=20 > > > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0x86/retpoline/entry: Convert entry assembler indirect jumps > > Thanks. We've fixed the underlying problem with the alternatives > > mechanism, *and* changed the retpoline code not to actually rely on > > said fix. > Hi David and all, > It looks the latest upstream tree did fix the issue. > Can you please specify the related commit(s) that fixed the issue? > I need to cherry-pick the fix. I suppose a quick reply from you would sav= e > =C2=A0me a lot of time. :-) Hi Dexuan, The above commit didn't ever make it into Linus' tree in that form; the issues were fixed beforehand. So there isn't a subsequent commit that fixes it. I think it might have just been removing some .align 16 from nospec-branch.h? The correct version has been backported to 4.9 and 4.4 releases already; if you pulled in an early version directly from tip/x86/pti then I'd recommend you drop it and pull in the real version instead. --=-MZMOeAYzoIzDtnh/WkmM 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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