From mboxrd@z Thu Jan 1 00:00:00 1970 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 lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 08737D116F1 for ; Mon, 1 Dec 2025 14:30:38 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1vQ4un-0004K8-N1; Mon, 01 Dec 2025 09:30:09 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1vQ4ui-0004Ju-3B for qemu-devel@nongnu.org; Mon, 01 Dec 2025 09:30:04 -0500 Received: from desiato.infradead.org ([2001:8b0:10b:1:d65d:64ff:fe57:4e05]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1vQ4ue-0001nd-3w for qemu-devel@nongnu.org; Mon, 01 Dec 2025 09:30:03 -0500 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=mck1VJCxedYfJ/28tsMS4mZzMApVTeca+kVHIIjnA2Q=; b=COVnP3Qcjyq3xjXK8Wq09DDllS UDouaoilgJTD9xNG+VTV+UjBO8Ox95QevV0LkpHzEw3tKlHEMHbdtsap/EyH8BjqAcnOMt8uHZuRp cyIznqizcwsAn7MHo3M3+ymOs+nPTuCsE6hBT9MOPj7YFkvlseCZPRk6MyJzUChzNoMpt/HMyjZEe 8IOZnVKY1MS/77Lu1Yb2EQ1VHd+Iqc0bmsyz8GXMb62wJc7p47FXONBxa6wlbLeJzfK0bXONTC9X5 p7CqBIlmtOudsjq/8BwmYrsACxZppBYkDRWZ3weN/GvAkZd+9lL89uQjYduKNrCEeM8Jpr/kz9spZ acqhhQsQ==; 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 1vQ432-0000000G0gS-1os8; Mon, 01 Dec 2025 13:34:36 +0000 Message-ID: Subject: Re: [RFC PATCH 3/4] hw/acpi: add VM generation counter field to VMClock From: David Woodhouse To: "Daniel P." =?ISO-8859-1?Q?Berrang=E9?= , "Chalios, Babis" Cc: "mst@redhat.com" , "imammedo@redhat.com" , "cohuck@redhat.com" , "pbonzini@redhat.com" , "qemu-devel@nongnu.org" , "Graf (AWS), Alexander" , "mzxreary@0pointer.de" Date: Mon, 01 Dec 2025 14:29:57 +0000 In-Reply-To: References: <20251201125023.18344-1-bchalios@amazon.es> <20251201125023.18344-5-bchalios@amazon.es> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-KPW+5Qpz4YMGbULmFdVb" User-Agent: Evolution 3.52.3-0ubuntu1 MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by desiato.infradead.org. See http://www.infradead.org/rpr.html Received-SPF: none client-ip=2001:8b0:10b:1:d65d:64ff:fe57:4e05; envelope-from=BATV+cd717ce28a9accd739e3+8135+infradead.org+dwmw2@desiato.srs.infradead.org; helo=desiato.infradead.org X-Spam_score_int: -43 X-Spam_score: -4.4 X-Spam_bar: ---- X-Spam_report: (-4.4 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_MED=-2.3, SPF_HELO_NONE=0.001, SPF_NONE=0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org --=-KPW+5Qpz4YMGbULmFdVb Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Mon, 2025-12-01 at 14:12 +0000, Daniel P. Berrang=C3=A9 wrote: > From QEMU's POV, live migration and snapshots > are indistiguishable operations, both using the same functionaility. >=20 > eg > =C2=A0 $ qemu-system-x86_64 -monitor stdio -device vmclock > =C2=A0 (qemu) migrate file:snapshot.img >=20 > and >=20 > =C2=A0 $ qemu-system-x86_64 -monitor stdio -device vmclock -incoming file= :snapshot.img >=20 >=20 > and we can't check the QEMU migration target being "file:" and mgmt > apps can use the "fd:" protocol to pass in a pre-opened target which can > be a socket or pipe or file. What triggers the vmgenid to actually get updated for a snapshot? That's the condition we're after, isn't it? --=-KPW+5Qpz4YMGbULmFdVb 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 nnI9/8Lqpq79tLHYwLajotwLiGTB71AGN5xK+tzB+D4eN9lXayrjcszgbOv2ZCgzExQUAIt98mre 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