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[209.132.180.67]) by mx.google.com with ESMTP id q127si2936012pga.660.2018.01.30.09.37.31; Tue, 30 Jan 2018 09:37:45 -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=asazFq7L; 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 S1753588AbeA3RO1 (ORCPT + 99 others); Tue, 30 Jan 2018 12:14:27 -0500 Received: from twosheds.infradead.org ([90.155.92.209]:45962 "EHLO twosheds.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751853AbeA3RO0 (ORCPT ); Tue, 30 Jan 2018 12:14:26 -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=dNknBGf70mrvBs0FVsLf46WDqeRW3iVNsGRctpZ2zZA=; b=asazFq7L4UL76uLZCQfz53RiZ 7nmGNDZO3ZmUCe3lCBI+aJUMetsVdc0odb2B1V39emXX75LI+ihnSfaAdxrIAIbV+nS950xZ6LnZG bagnsCBDAgs+hWI0Fh1vwIVsgYjAT2tAZf9bdMuniS58agbSJ9tJiVlNNhD4cMMYNtfz7qkyj1gWK PsZi5u/gtDlSc68aRnQju3v4J603jV/m1AYM9VpfYkH7pDTbSRcmr915EUrfQWoCEiwp+oNArC9HT QSnWgXdHJoqtjWjOvIQ/0c3gD8M+E5CSzesD5UOr0CmKZ4rFNNuvmzIQesNjVLHtGxlyahFxPUwLN 0Waz6l2uA==; Received: from [2001:8b0:10b:1:c46f:697a:7a7b:515e] by twosheds.infradead.org with esmtpsa (Exim 4.89 #1 (Red Hat Linux)) id 1egZU9-0003PS-SD; Tue, 30 Jan 2018 17:14:18 +0000 Message-ID: <1517332457.18619.132.camel@infradead.org> Subject: Re: [9/8] KVM: x86: limit MSR_IA32_SPEC_CTRL access based on CPUID availability From: David Woodhouse To: Jim Mattson , Mihai Carabas Cc: Paolo Bonzini , LKML , kvm list , Radim =?UTF-8?Q?Kr=C4=8Dm=C3=A1=C5=99?= , Liran Alon , Anthony Liguori , Tom Lendacky , Borislav Petkov , the arch/x86 maintainers , Konrad Rzeszutek Wilk In-Reply-To: References: <20180109120311.27565-10-pbonzini@redhat.com> <6dc02278-7004-1794-3705-69c8cad86be4@oracle.com> Face: 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 Content-Type: multipart/signed; micalg="sha-256"; protocol="application/x-pkcs7-signature"; boundary="=-XrpawYpwsMf17pj6+A/h" Date: Tue, 30 Jan 2018 17:14:17 +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 --=-XrpawYpwsMf17pj6+A/h Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Tue, 2018-01-30 at 08:57 -0800, Jim Mattson wrote: > It's really hard to tell which patches are being proposed for which > repositories, but assuming that everything else is correct, I don't > think your condition is adequate. What if the physical CPU and the > virtual CPU both have CPUID.(EAX=3D7H,ECX=3D0):EDX[26], but only the > physical CPU has CPUID.(EAX=3D7H,ECX=3D0):EDX[27]? If the guest has write > access to MSR_IA32_SPEC_CTRL, it can set MSR_IA32_SPEC_CTRL[1] > (STIBP), even though setting that bit in the guest should raise #GP. Everything we're talking about here is for tip/x86/pti. Which I note has just updated to be 4.15-based, although I thought it was going to stay on 4.14 for now. So I've updated my tree at http://git.infradead.org/linux-retpoline.git/shortlog/refs/heads/ibpb accordingly. You can always write to the STIBP bit without a #GP even when it's not advertised/available. There's a possibility that we'll want to always trap and *prevent* that, instead of passing through =E2=80=94 because doing so will also have = an effect on the HT siblings. But as discussed, I wanted to get the basics working before exploring the complex IBRS/STIBP interactions. This much should be OK to start with. --=-XrpawYpwsMf17pj6+A/h 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 3PZ0chY1PaVWjg59d4Uno+5LRDbgCnPkKJX4ysBGadibjBGQGJEZCjh94iiEebn2KsRLvtrJ72Ph 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