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 016D0D116F1 for ; Mon, 1 Dec 2025 14:27:26 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1vQ4ry-0003m4-8P; Mon, 01 Dec 2025 09:27:14 -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 1vQ4rv-0003lM-D4 for qemu-devel@nongnu.org; Mon, 01 Dec 2025 09:27:11 -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 1vQ4rr-0001QZ-J0 for qemu-devel@nongnu.org; Mon, 01 Dec 2025 09:27:11 -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=l4KZSIH8XyHR8x2G6CzvraJaHHQB+OqJSq+t93DZiwM=; b=RSxijtNkVtqaPQFkwKfFoRLgJj PwvWTJJWrgWxCLBz4C5wZW68MtizaqR7JJRT5WajvUuYTdTVA0IqfLv/MJ/hF/JKLDSEAZNj9g9U9 x8KsWuabOAMtblsebKVpNJfYi9+TQKAjCX3TnczwHeIpsyZyXKUqYfRbj6UlIO5zE0lLkPRNgTSH4 pHcAyksr1qRzvz+MAMbRbtCsg6ScvltRb8NKLqtpKvQ9QaM/whO/Sfj041UrvG+YztAlTegfRtu2d ft1U/VTVJoHT8Qw8ZVl2l5DSB5IPG7ZzSmPMPnbkWPrK1fP2WbBjUvCFQwBSoBIalphblsG5AxjlX l78hQUbw==; 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 1vQ40C-0000000G0Su-1gIH; Mon, 01 Dec 2025 13:31:40 +0000 Message-ID: <8e8ab56ce4f8f2a0f0c084bd4e48958a441b40f1.camel@infradead.org> Subject: Re: [RFC PATCH 2/4] hw/acpi: add new fields in VMClock ABI From: David Woodhouse To: Cornelia Huck , "Chalios, Babis" , "mst@redhat.com" , "imammedo@redhat.com" , "pbonzini@redhat.com" Cc: "qemu-devel@nongnu.org" , "Graf (AWS), Alexander" , "mzxreary@0pointer.de" Date: Mon, 01 Dec 2025 14:27:00 +0000 In-Reply-To: <87ldjmnwyt.fsf@redhat.com> References: <20251201125023.18344-1-bchalios@amazon.es> <20251201125023.18344-4-bchalios@amazon.es> <87qztenykd.fsf@redhat.com> <196b8afa77ec3253006dcde712b07f4e9c70de30.camel@infradead.org> <87ldjmnwyt.fsf@redhat.com> Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-RQSwJ6P6u57FGIPijfem" 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 --=-RQSwJ6P6u57FGIPijfem Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Mon, 2025-12-01 at 14:38 +0100, Cornelia Huck wrote: > On Mon, Dec 01 2025, David Woodhouse wrote: >=20 > > On Mon, 2025-12-01 at 14:04 +0100, Cornelia Huck wrote: > > > On Mon, Dec 01 2025, "Chalios, Babis" wrote: > > >=20 > > > > VMClock now supports a vm_generation_counter field in the struct it > > > > exposes to userspace. The field signals a disruption that happened = due > > > > to a guest loaded from a snapshot. > > > >=20 > > > > Moreover, VMClock now optionally supports device notifications when= the > > > > seq_count changes to a new even value. > > > >=20 > > > > Signed-off-by: Babis Chalios > > > > --- > > > > =C2=A0include/standard-headers/linux/vmclock-abi.h | 20 +++++++++++= +++++++++ > > > > =C2=A01 file changed, 20 insertions(+) > > >=20 > > > Please either do a full linux-headers update against a specific Linux > > > kernel version, or mark this as a placeholder patch if the code is no= t > > > yet merged. > >=20 > > The Linux patches are being posted simultaneously, so they'll be in > > Linux 6.20 (7.0?) at the earliest. We'll want to ingest the update > > before then. > >=20 > > The intent is not for the Linux source to be the canonical definition > > of the data structure; we *are* working on publishing the spec, and > > Babis referenced the current draft. It isn't in the form of C source > > code though, so I suspect it makes sense to keep including the Linux > > header? >=20 > Oh, including the Linux header sounds fine; but as long as the code has > not yet been merged there, this needs to be marked as not yet ready to > merge on the QEMU side. (And it needs to be updated by a full headers > update when merged.) That's exactly what we *don't* want, and why we say that the canonical definition of this structure is the actual specification. There's no need for QEMU to only ever follow Linux. In that case, probably best *not* to use the Linux header and instead to build our own specifically for QEMU based on the specification. 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