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 C4E66C64EC4 for ; Thu, 9 Mar 2023 15:46:52 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229743AbjCIPqt (ORCPT ); Thu, 9 Mar 2023 10:46:49 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:51898 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230018AbjCIPqn (ORCPT ); Thu, 9 Mar 2023 10:46:43 -0500 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E5135E6FFD; Thu, 9 Mar 2023 07:46:40 -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=+ibVpVTZ6Y/yBrYRXUv6u2tuGtLPnTL1TKLjKm7wd50=; b=oT8liR5Dej6PAtVQqbfHjpFs7S UEqmlPtjIw23FKqprP7cf/qGx46/X7qw4HIMvJKMjMwj74YXXiMek+ec/3xXX31rYBgfkk6bNk2s0 f5+jyyMM1MBb4CeL+0Z3uQ/FdkL0glZg5SLQzVxHqRn3ikNEe9TSYrNBMP36oWRQrRFB7aCIARSN/ Vbkoo8KpwRkZzsQa1stPLJHmw+RnFgLfC1mLDWtZtWCgXKAHiENihM5xkxUfgEQg9Ip/xyy7cIRi7 cK0xjNVpO6M8Z9VUCUfygeI8jF4cqfJribw7coZyb4nfB1giQspr4D9N1YbIhUy1f1f4l6JFbsJJI /NhX6rAA==; 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 1paISX-008Y5P-MP; Thu, 09 Mar 2023 15:45:38 +0000 Message-ID: Subject: Re: [PATCH v5 06/14] x86/ioremap: Support hypervisor specified range to map as encrypted From: David Woodhouse To: Borislav Petkov , =?ISO-8859-1?Q?J=F6rg_R=F6del?= , Usama Arif Cc: Tom Lendacky , 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 15:45:35 +0000 In-Reply-To: <20230309144505.GEZAnw8QpyOyMpCD4r@fat_crate.local> References: <255249f2-47af-07b7-d9d9-9edfdd108348@intel.com> <20230306215104.GEZAZgSPa4qBBu9lRd@fat_crate.local> <20230309115937.GAZAnKKRef99EwOu/S@fat_crate.local> <20230309144505.GEZAnw8QpyOyMpCD4r@fat_crate.local> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-E/M0sf9Z5+v90I47VU44" 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 --=-E/M0sf9Z5+v90I47VU44 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Thu, 2023-03-09 at 15:45 +0100, Borislav Petkov wrote: > On Thu, Mar 09, 2023 at 03:36:45PM +0100, J=C3=B6rg R=C3=B6del wrote: > > Yes, that is right. The key is mainly for the NMI entry path which can > > be performance relevant in some situations. For SEV-ES some special > > handling is needed there to re-enable NMIs and adjust the #VC stack in > > case it was raised on the VC-handlers entry path. >=20 > So the performance argument is meh. That key will be replaced by >=20 > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0if (cc_vendor =3D=3D CC_V= ENDOR_AMD && > =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 cc_pla= tform_has(CC_ATTR_GUEST_STATE_ENCRYPT) >=20 > which is something like 4 insns or so. Tops. >=20 > Haven't looked yet but it should be cheap. cc_vendor isn't yet exposed. As we discussed this in IRC, I've been updating the parallel bringup support for SEV-ES, including adding a cc_get_vendor() function, in the top of my tree at https://git.infradead.org/users/dwmw2/linux.git/commitdiff/parallel-6.2-v15 and it now looks like this: /* * 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. Parallel * startup doesn't have to be in the first round of enabling patches * for any such technology. */ if (cc_platform_has(CC_ATTR_GUEST_STATE_ENCRYPT)) { switch (cc_get_vendor()) { case CC_VENDOR_AMD: has_sev_es =3D true; break; default: pr_info("Disabling parallel bringup due to guest state encryption\n"); return false; } } Using an explicit CC_ATTR_NO_EARLY_CPUID flag instead of CC_ATTR_GUEST_STATE_ENCRYPT which is merely an approximation of that, might be interesting. --=-E/M0sf9Z5+v90I47VU44 Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCEkQw ggYQMIID+KADAgECAhBNlCwQ1DvglAnFgS06KwZPMA0GCSqGSIb3DQEBDAUAMIGIMQswCQYDVQQG EwJVUzETMBEGA1UECBMKTmV3IEplcnNleTEUMBIGA1UEBxMLSmVyc2V5IENpdHkxHjAcBgNVBAoT FVRoZSBVU0VSVFJVU1QgTmV0d29yazEuMCwGA1UEAxMlVVNFUlRydXN0IFJTQSBDZXJ0aWZpY2F0 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