Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 51B96C6FD1C for ; Thu, 9 Mar 2023 13:02:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231342AbjCINC5 (ORCPT ); Thu, 9 Mar 2023 08:02:57 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41038 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231348AbjCINC3 (ORCPT ); Thu, 9 Mar 2023 08:02:29 -0500 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1DAF4E6DB9; Thu, 9 Mar 2023 05:01:34 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=MIME-Version:Content-Type:References: In-Reply-To:Date:Cc:To:From:Subject:Message-ID:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=GdmYzzdYXqiQfqATchXktX5WQbFzBfed2pjASkC2ktg=; b=fpla+EajZ2b7b0aRGcnsdESTgQ VDX60AgJ4ewqI2vws1uTyQ0gfeRHUT4ut//XAIcOjzWwg/ujK5wgDa5RGpdco5lUJoFkSdkkSK2ph C2GLomnOtsTFxAjL7PzmEOARgu1qDPw/BWaxXXhqnXvjvCTlesRDKRtcJh7KerPjuGwC3qZZK8AnT oz4EBqLUO4S5Ai/OBle1Dl+qwBFwkIN1hP5KMttXBEViSbAMCryVbS+sNWKp1imD3nqXvNglh8S2y pzU3Knt8nFnUqP6tGGRxA/QNefqj4TExApd0ofY0/5LIEuj9J69NW2AbaghrP4K6tcjjNqQ+XsI0A wOKAFzGg==; Received: from [2001:8b0:10b:5:e62f:87cb:46b1:1399] (helo=u3832b3a9db3152.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1paFss-008QZg-MB; Thu, 09 Mar 2023 13:00:39 +0000 Message-ID: <35bc1f658d1774ad2ea7a38b3874cebff58f7d49.camel@infradead.org> Subject: Re: [PATCH v5 06/14] x86/ioremap: Support hypervisor specified range to map as encrypted From: David Woodhouse To: Borislav Petkov , "thomas.lendacky@amd.com" , =?ISO-8859-1?Q?J=F6rg_R=F6del?= Cc: Dave Hansen , "Michael Kelley (LINUX)" , Sean Christopherson , "hpa@zytor.com" , KY Srinivasan , Haiyang Zhang , "wei.liu@kernel.org" , Dexuan Cui , "luto@kernel.org" , "peterz@infradead.org" , "davem@davemloft.net" , "edumazet@google.com" , "kuba@kernel.org" , "pabeni@redhat.com" , "lpieralisi@kernel.org" , "robh@kernel.org" , "kw@linux.com" , "bhelgaas@google.com" , "arnd@arndb.de" , "hch@lst.de" , "m.szyprowski@samsung.com" , "robin.murphy@arm.com" , "brijesh.singh@amd.com" , "tglx@linutronix.de" , "mingo@redhat.com" , "dave.hansen@linux.intel.com" , Tianyu Lan , "kirill.shutemov@linux.intel.com" , "sathyanarayanan.kuppuswamy@linux.intel.com" , "ak@linux.intel.com" , "isaku.yamahata@intel.com" , "dan.j.williams@intel.com" , "jane.chu@oracle.com" , "tony.luck@intel.com" , "x86@kernel.org" , "linux-kernel@vger.kernel.org" , "linux-hyperv@vger.kernel.org" , "netdev@vger.kernel.org" , "linux-pci@vger.kernel.org" , "linux-arch@vger.kernel.org" , "iommu@lists.linux.dev" Date: Thu, 09 Mar 2023 13:00:36 +0000 In-Reply-To: <20230309115937.GAZAnKKRef99EwOu/S@fat_crate.local> References: <255249f2-47af-07b7-d9d9-9edfdd108348@intel.com> <20230306215104.GEZAZgSPa4qBBu9lRd@fat_crate.local> <20230309115937.GAZAnKKRef99EwOu/S@fat_crate.local> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-gKJpathxkcv3F4u4ZN3q" User-Agent: Evolution 3.44.4-0ubuntu1 MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --=-gKJpathxkcv3F4u4ZN3q Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Thu, 2023-03-09 at 12:59 +0100, Borislav Petkov wrote: >=20 > So looking at sev_es_init_vc_handling() where we set that key, I'm > *thinking* that key can be removed now and the code should check >=20 > =C2=A0 cc_platform_has(CC_ATTR_GUEST_STATE_ENCRYPT) >=20 > instead. >=20 > Because if some of the checks in that function below fail, the guest > will terminate anyway. >=20 > J=C3=B6rg, Tom? Hrm... the implication of that is that I should do something like this in my own code. Is this really your intent? diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c index b4265c5b46da..7ac4ec6415de 100644 --- a/arch/x86/kernel/smpboot.c +++ b/arch/x86/kernel/smpboot.c @@ -1519,24 +1519,17 @@ void __init smp_prepare_cpus_common(void) */ static bool prepare_parallel_bringup(void) { - bool has_sev_es =3D sev_es_active(); + /* + * The "generic" CC_ATTR_GUEST_STATE_ENCRYPT actually means specifically + * SEV-ES, and only SEV-ES, and always shall mean that. If it's present, + * that means the AP startup code should use the hard-coded SEV-ES GHCB + * call to find its APIC ID (STARTUP_APICID_SEV_ES). + */ + bool has_sev_es =3D cc_platform_has(CC_ATTR_GUEST_STATE_ENCRYPT); =20 if (IS_ENABLED(CONFIG_X86_32)) return false; =20 - /* - * Encrypted guests other than SEV-ES (in the future) will need to - * implement an early way of finding the APIC ID, since they will - * presumably block direct CPUID too. Be kind to our future selves - * by warning here instead of just letting them break. 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