From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from desiato.infradead.org (desiato.infradead.org [90.155.92.199]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 592C729D29E; Fri, 27 Mar 2026 09:17:26 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=90.155.92.199 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774603051; cv=none; b=ZcvvwH2RViVUItrtk5hp9GSWtHOeCfv1hG/BIDBWKwl5fpggbwE06/cV/W8QCyVjUL3AOPt9Hzct4T0kyrQVf//ak+kVllQC0qxa3tQBPsrQdctsXKOl1MXuJuhar1iO2Z7+lzxmqXRQ8cjS5ZvfVJcbICDAYS25jdIEAKsrMRE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774603051; c=relaxed/simple; bh=ukPPOOuGq4b2VRwVBu5ddSBOMBbqpYz6x4E8Bm5FfJM=; h=Message-ID:Subject:From:To:Cc:Date:In-Reply-To:References: Content-Type:MIME-Version; b=UNqnBKasyqlyMJHGRZ8Uycn3LiPlfwzbHTzS4InaXJKF3JyjslGXxim6k/MBo7AgU9hm1BqZtZlcC/ioX1HM+bt2fjjn+be3Cc88/8Mo+DxXmPyCWzRm4WkEiThGHdWxOFUpZrhBg/J8o+YrXN2wkHcleVZ5jpvMrgoPHw2Wlrk= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=infradead.org; spf=none smtp.mailfrom=desiato.srs.infradead.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b=PkOMfS5D; arc=none smtp.client-ip=90.155.92.199 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=infradead.org Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=desiato.srs.infradead.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="PkOMfS5D" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=desiato.20200630; 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=ukPPOOuGq4b2VRwVBu5ddSBOMBbqpYz6x4E8Bm5FfJM=; b=PkOMfS5D0QdJ7CmvZzsZL1/Cxq cpaJYliN6G1EibLhQmwLi2IcmO8QP/P6g4+Lla345p+QeuodgoMv67TUcBaj6ampa9Qf2BvmKs2qE J1/7X2F7YlgKHBIGnx2gqJPvNsG83P5orpB2uQbbQfgncV7DkXw6wY++qSlVOjPhB4H0Hm+rJIh0M 6xYNNQZKyXRfwQxeHDXqG6VR/YlDKdFUetyb7WGyUmiB0YAcQrRqYnaqIhg/B29Eb0LSyk1qDnh0q v5oG1/K+W9lwxNvOWVeqLe/eoaRKgg1XgZ5BnHxVShxamxPpCJSJ/1+43ixMVuKNxYv9grym/LST7 2Bwbybtw==; Received: from [172.31.31.148] (helo=u09cd745991455d.lumleys.internal) by desiato.infradead.org with esmtpsa (Exim 4.98.2 #2 (Red Hat Linux)) id 1w63JX-0000000A3Jn-3hI6; Fri, 27 Mar 2026 09:17:12 +0000 Message-ID: <646c19398708901454c7336e408d80f8695060fe.camel@infradead.org> Subject: Re: [ANNOUNCE] x86-cpuid-db: Release v3.0 From: David Woodhouse To: "Ahmed S. Darwish" , Borislav Petkov , Dave Hansen , Ingo Molnar Cc: Thomas Gleixner , Andrew Cooper , "H. Peter Anvin" , Sean Christopherson , Peter Zijlstra , Christian Ludloff , Sohil Mehta , Maciej Wieczor-Retman , John Ogness , x86@kernel.org, x86-cpuid@lists.linux.dev, LKML Date: Fri, 27 Mar 2026 09:17:11 +0000 In-Reply-To: References: Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-uMc2wrwJ3le0ZDFRy/oX" User-Agent: Evolution 3.52.3-0ubuntu1.1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by desiato.infradead.org. See http://www.infradead.org/rpr.html --=-uMc2wrwJ3le0ZDFRy/oX Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Fri, 2026-03-27 at 04:05 +0100, Ahmed S. Darwish wrote: > Hi, >=20 > I'm happy to announce release 3.0 of the x86-cpuid-db project: >=20 > =C2=A0=C2=A0 https://gitlab.com/x86-cpuid.org/x86-cpuid-db > =C2=A0=C2=A0 https://gitlab.com/x86-cpuid.org/x86-cpuid-db/-/releases/v3.= 0 It still doesn't iterate over the hypervisor blocks at 0x4000_0x00 and find all of them. Both Xen and KVM will advertise the Hyper-V leaves at 0x4000_0000 and then their own get shifted to 0x4000_0100. And now we can host HyperV-enlightened Xen guests under KVM, perhaps we could do HyperV, then Xen, then KVM at 0x4000_0200? I was checking to see if it has all the ways to detect the Extended Destination ID enlightenment documented in the last page ("Hypervisor detection via CPUID") of https://david.woodhou.se/ExtDestId.pdf=20 I think I see the Xen and KVM bits there, and I guess reporting them with different strings in feature.c is kind of OK? The Bhyve and Viridian bits are missing. Also, the leaf at 0x40000010 isn't necessarily VMware-specific; it's seen elsewhere too. At least EC2 exposes it under KVM. See thread at about https://lore.kernel.org/all/aLDo3F3KKW0MzlcH@google.com/=20 --=-uMc2wrwJ3le0ZDFRy/oX Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExDzANBglghkgBZQMEAgEFADCABgkqhkiG9w0BBwEAAKCCD9Aw ggSOMIIDdqADAgECAhAOmiw0ECVD4cWj5DqVrT9PMA0GCSqGSIb3DQEBCwUAMGUxCzAJBgNVBAYT AlVTMRUwEwYDVQQKEwxEaWdpQ2VydCBJbmMxGTAXBgNVBAsTEHd3dy5kaWdpY2VydC5jb20xJDAi BgNVBAMTG0RpZ2lDZXJ0IEFzc3VyZWQgSUQgUm9vdCBDQTAeFw0yNDAxMzAwMDAwMDBaFw0zMTEx MDkyMzU5NTlaMEExCzAJBgNVBAYTAkFVMRAwDgYDVQQKEwdWZXJva2V5MSAwHgYDVQQDExdWZXJv a2V5IFNlY3VyZSBFbWFpbCBHMjCCASIwDQYJKoZIhvcNAQEBBQADggEPADCCAQoCggEBAMjvgLKj jfhCFqxYyRiW8g3cNFAvltDbK5AzcOaR7yVzVGadr4YcCVxjKrEJOgi7WEOH8rUgCNB5cTD8N/Et GfZI+LGqSv0YtNa54T9D1AWJy08ZKkWvfGGIXN9UFAPMJ6OLLH/UUEgFa+7KlrEvMUupDFGnnR06 aDJAwtycb8yXtILj+TvfhLFhafxroXrflspavejQkEiHjNjtHnwbZ+o43g0/yxjwnarGI3kgcak7 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