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[209.132.180.67]) by mx.google.com with ESMTP id o1-v6si232088plk.621.2018.02.02.14.18.52; Fri, 02 Feb 2018 14:19:07 -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=ZLH67+3a; 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 S1752007AbeBBUQd (ORCPT + 99 others); Fri, 2 Feb 2018 15:16:33 -0500 Received: from twosheds.infradead.org ([90.155.92.209]:51024 "EHLO twosheds.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751589AbeBBUQ1 (ORCPT ); Fri, 2 Feb 2018 15:16:27 -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=XX0eL7A2dKTSFK68FlS67OuPz+mpjnt/wA+e63rlV+M=; b=ZLH67+3a3OAAub5KZcR0Ubs20 POcKZu2OOBTm7qGglzHBiDsO+mgkjPXwlFPqcbHHBpY7VFbgDqhW/NiONP7lOEyy1R4SjbMVHPNbF H08pMGQ/iFwHc3Fz0YFtoviQ1ENezALHV6Wv65seLSm76itc5muTaa2aFwOasjNbxgsDw1XuQmJ8c bWi4Hieu8rHyKuK9UgG1s8vQD3Ynlf65+l0qGuPPYwXDl/NTmJdatIb4B3SniiJvIW8HfJRkl27qb +s7+iQuQ8PNbUkOJ/N/0D4oZYXQqIexQ6ksAi3L2T10DFRXN8QaAWPZ6vwMloJXsH6r7xd+14k6n5 PS0MEoH8w==; Received: from [2001:8b0:10b:1:d1d9:ea07:dbdf:a8a4] by twosheds.infradead.org with esmtpsa (Exim 4.89 #1 (Red Hat Linux)) id 1ehhkt-0006O8-Po; Fri, 02 Feb 2018 20:16:17 +0000 Message-ID: <1517602575.31953.74.camel@infradead.org> Subject: Re: [PATCH v6 2/5] KVM: x86: Add IBPB support From: David Woodhouse To: Konrad Rzeszutek Wilk Cc: KarimAllah Ahmed , kvm@vger.kernel.org, linux-kernel@vger.kernel.org, x86@kernel.org, Ashok Raj , Asit Mallick , Dave Hansen , Arjan Van De Ven , Tim Chen , Linus Torvalds , Andrea Arcangeli , Andi Kleen , Thomas Gleixner , Dan Williams , Jun Nakajima , Andy Lutomirski , Greg KH , Paolo Bonzini , Peter Zijlstra In-Reply-To: <20180202195601.GD28192@char.us.oracle.com> References: <1517522386-18410-1-git-send-email-karahmed@amazon.de> <1517522386-18410-3-git-send-email-karahmed@amazon.de> <20180202174932.GR28192@char.us.oracle.com> <1517594544.31953.62.camel@infradead.org> <20180202195601.GD28192@char.us.oracle.com> Face: 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 Content-Type: multipart/signed; micalg="sha-256"; protocol="application/x-pkcs7-signature"; boundary="=-5+WHAbVQ6Ye7/qx5Y3Ht" Date: Fri, 02 Feb 2018 20:16:15 +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 --=-5+WHAbVQ6Ye7/qx5Y3Ht Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Fri, 2018-02-02 at 14:56 -0500, Konrad Rzeszutek Wilk wrote: > On Fri, Feb 02, 2018 at 06:02:24PM +0000, David Woodhouse wrote: > >=20 > > On Fri, 2018-02-02 at 12:49 -0500, Konrad Rzeszutek Wilk wrote: > > >=20 > > > >=20 > > > > @@ -625,7 +629,12 @@ static inline int __do_cpuid_ent(struct > > > > kvm_cpuid_entry2 *entry, u32 function, > > > > =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=C2=A0if (!g_phys_as) > > > > =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=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2= =A0=C2=A0g_phys_as =3D phys_as; > > > > =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=C2=A0entry->eax =3D g_phys_as | (virt_as << = 8); > > > > -=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=A0entry->ebx =3D entry->edx =3D 0; > > > > +=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=A0entry->edx =3D 0; > > > > +=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/* IBPB isn't necessarily present in hardware cpuid= >=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=C2=A0if (boot_cpu_has(X86_FEATURE_IBPB)) > > > > +=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=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0ent= ry->ebx |=3D F(IBPB); > > > > +=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=A0entry->ebx &=3D kvm_cpuid_8000_0008_ebx_x86_feature= s; > > > > +=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=A0cpuid_mask(&entry->ebx, CPUID_8000_0008_EBX); > > > It is with x86/pti nowadays. I think you can remove that comment. > > In this code we use the actual CPUID instruction, then filter stuff out > > of it (with &=3D kvm_cpuid_XXX_x86_features and then cpuid_mask() to tu= rn > > off any bits which were otherwise present in the hardware and *would* > > have been supported by KVM, but which the kernel has decided to pretend > > are not present. > >=20 > > Nothing would *set* the IBPB bit though, since that's a "virtual" bit > > on Intel hardware. The comment explains why we have that |=3D F(IBPB), > > and if the comment wasn't true, we wouldn't need that code either. > > But this seems wrong. That is on Intel CPUs we will advertise on > AMD leaf that the IBPB feature is available. >=20 > Shouldn't we just check to see if the machine is AMD before advertising > this bit? No. The AMD feature bits give us more fine-grained support for exposing IBPB or IBRS alone, so we expose those bits on Intel too. --=-5+WHAbVQ6Ye7/qx5Y3Ht 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 5PqFmWkbehLaEvbpNY7dmEAAeKh4klTzJzrr5AAzaCQ32cA2e3+DEIv5O5l9ViMIjy/JM+xMQrfX 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