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 D72C7C61DA4 for ; Wed, 22 Feb 2023 10:26:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231876AbjBVK0m (ORCPT ); Wed, 22 Feb 2023 05:26:42 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33058 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229726AbjBVK0l (ORCPT ); Wed, 22 Feb 2023 05:26:41 -0500 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 8E78336096 for ; Wed, 22 Feb 2023 02:26:40 -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=kMYqcVwJx/iP4jsYzL3AvQK5L2FlQeKCE+KazAWIy3k=; b=fMoQWb2zu1zy8zQSiAhA98UVWf 1OCURigMKBb8r+XK2P/SPzj+2yzw36VAXELSLQDLTSg3CYZPfDarGCO3Q4p+bB5YB7UjMEFBLxg77 iGU0RzfHR1ln85BFj6dY9xu9hYuDO6fdcVTCKh2TxcwTYTn5NNbjBHKm29cwHTkrh0A+iYfdDkPRJ TQAVGI6IrJu4mccFjNgVMINZJ9v2J7/J8J1Csrxw69mhPCymxna+HLc3ZNqESYmEwEZTuhPCcylN+ gG+DN8b9AgRRspOuCM466LhIYiJcg0K9XzpI58I8D7tFE+I3alNHHe7PVFfo4sI94pdwnjiyd7nky mGpydWAA==; Received: from [2001:8b0:10b:5::bb3] (helo=u3832b3a9db3152.ant.amazon.com) by casper.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1pUmKM-00DNyG-VL; Wed, 22 Feb 2023 10:26:23 +0000 Message-ID: <6b09a3505bf3deaa11906a2ecb9d15c4ec427ea2.camel@infradead.org> Subject: Re: [PATCH 0/2] Kexec enabling in TDX guest From: David Woodhouse To: "Kirill A. Shutemov" , Dave Hansen , Borislav Petkov Cc: Kuppuswamy Sathyanarayanan , Thomas Gleixner , Isaku Yamahata , x86@kernel.org, linux-coco@lists.linux.dev, kexec@lists.infradead.org, linux-kernel@vger.kernel.org Date: Wed, 22 Feb 2023 10:26:22 +0000 In-Reply-To: <20230213234836.3683-1-kirill.shutemov@linux.intel.com> References: <20230213234836.3683-1-kirill.shutemov@linux.intel.com> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-2FkNtV6wNwFOCt0s3bH1" 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 --=-2FkNtV6wNwFOCt0s3bH1 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Tue, 2023-02-14 at 02:48 +0300, Kirill A. Shutemov wrote: > The patch brings basic enabling of kexec in TDX guests. >=20 > By "basic enabling" I mean, kexec in the guests with a single CPU. > TDX guests use ACPI MADT MPWK to bring up secondary CPUs. The mechanism > doesn't allow to put a CPU back offline if it has woken up. >=20 > We are looking into this, but it might take time. Can't we park the secondary CPUs in a purgatory-like thing of their own and wake them from there when we want them? Patches for that were floating around once, although the primary reason then was latency, and we decided to address that differently by doing the bringup in parallel instead. --=-2FkNtV6wNwFOCt0s3bH1 Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCEkQw ggYQMIID+KADAgECAhBNlCwQ1DvglAnFgS06KwZPMA0GCSqGSIb3DQEBDAUAMIGIMQswCQYDVQQG EwJVUzETMBEGA1UECBMKTmV3IEplcnNleTEUMBIGA1UEBxMLSmVyc2V5IENpdHkxHjAcBgNVBAoT FVRoZSBVU0VSVFJVU1QgTmV0d29yazEuMCwGA1UEAxMlVVNFUlRydXN0IFJTQSBDZXJ0aWZpY2F0 aW9uIEF1dGhvcml0eTAeFw0xODExMDIwMDAwMDBaFw0zMDEyMzEyMzU5NTlaMIGWMQswCQYDVQQG EwJHQjEbMBkGA1UECBMSR3JlYXRlciBNYW5jaGVzdGVyMRAwDgYDVQQHEwdTYWxmb3JkMRgwFgYD VQQKEw9TZWN0aWdvIExpbWl0ZWQxPjA8BgNVBAMTNVNlY3RpZ28gUlNBIENsaWVudCBBdXRoZW50 aWNhdGlvbiBhbmQgU2VjdXJlIEVtYWlsIENBMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKC 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