From patchwork Tue Sep 29 00:39:15 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Denis V. Lunev\" via" X-Patchwork-Id: 11804773 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 1B35192C for ; Tue, 29 Sep 2020 00:41:05 +0000 (UTC) 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 mail.kernel.org (Postfix) with ESMTPS id 9A65821734 for ; Tue, 29 Sep 2020 00:41:04 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=google.com header.i=@google.com header.b="HU6erWKP" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 9A65821734 Authentication-Results: mail.kernel.org; dmarc=pass (p=none dis=none) header.from=nongnu.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Received: from localhost ([::1]:40020 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1kN3hX-0003gs-JG for patchwork-qemu-devel@patchwork.kernel.org; Mon, 28 Sep 2020 20:41:03 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:55540) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from <3S4JyXwsKChw9KCAFF6EG6F8GG8D6.4GEI6EM-56N6DFGF8FM.GJ8@flex--hskinnemoen.bounces.google.com>) id 1kN3gF-0002HA-5x for qemu-devel@nongnu.org; Mon, 28 Sep 2020 20:39:43 -0400 Received: from mail-qk1-x749.google.com ([2607:f8b0:4864:20::749]:55211) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from <3S4JyXwsKChw9KCAFF6EG6F8GG8D6.4GEI6EM-56N6DFGF8FM.GJ8@flex--hskinnemoen.bounces.google.com>) id 1kN3gD-0000PV-D1 for qemu-devel@nongnu.org; Mon, 28 Sep 2020 20:39:42 -0400 Received: by mail-qk1-x749.google.com with SMTP id r184so1663085qka.21 for ; Mon, 28 Sep 2020 17:39:40 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=sender:date:in-reply-to:message-id:mime-version:references:subject :from:to:cc; bh=cQm7cQnpxJnDzr+vk7QqhOO9BS7RbVnXECEf70CLEk4=; b=HU6erWKPw9aMyTgiKxlAcd2qHr20i+LP1CvcEwXrgmv16+zZwShULOzZz/tNutSUZt 530oaldDcj8awRacuv7AyiKzGAQdLZM9UwE24th1UIvUSD6dwtRLILTxXO+/njkIqA1i ywOP7c9c2y0omiqdRTFNZ3U1T8Fxsu0px7oDXDmogJSOY7swrjbT2o5DuPE+QDMOzzo1 JxgZMaRuYSa/k2iG9JwPJf+ywvdVyxHRep0EPsZiHCqcMpcoSGKsedHySRaKUh5e4Vdy QabkwPte1fOi1jwq0AxhEZIcQ6donG8/IQrNAM6g5krup8w5yuFHpVLJnMBfWVrJYSw3 cNJA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:sender:date:in-reply-to:message-id:mime-version :references:subject:from:to:cc; bh=cQm7cQnpxJnDzr+vk7QqhOO9BS7RbVnXECEf70CLEk4=; b=nKt97U6VI1oHy/k8rZabb2BRtUNihNHNjl58BbLwHWKvZBc3ZQLzb7c6/mj5P0KjNC KN6JJDsy0FbyyQ28kVOHFeqcQKSVfWIiXVm80fHONkekVTdt0P1AwbgeDR7Ivz78/Yht 7WlVz7Wok5UO2AYYsE6t/arRnzex96bzixgKhrwXEcEYqydciCpl0g26Og0Nqr7fJb4z pgHVxoHlODSFQzI5jlhpLog5agxbK3JoM4a3sTj/k3Z3G+8R8lmJAjaEyFBkj+lj9E37 rcyYnhKILoJO/STRg1mIDBG4fbHRas3jtGY5PntHP0XSmBAW8uN/lLtG8MXMZ2W7GTNZ 9s7A== X-Gm-Message-State: AOAM53287dUGNutQuhpJWINnXhVskiOobXYxSueC9HK0QHZ/m6yh1zHj KurE03jcFZMEO5FoQc5ErfJ2noXFqcPHrMGC7uZZdWbz8OLLXLnBRMhuPBgeJ6i2oVUHvdJgN0D eHXa9iSEYzqsFA4UUy8UgtZ03/Y4RcbOmU6Mr/GU6GzphXXDHIIVgo3dkNIFL4lrwx9YW6qOa8A == X-Google-Smtp-Source: ABdhPJwcbn6pxAJejfFvxdbgXmAxP0hPbeo0iA2hBs+h4G2i5Dafpfg2tOJWLEdp/l7awGmWVQnOjXMeGdwdOPoJoA== X-Received: from skybert.c.googlers.com ([fda3:e722:ac3:10:24:72f4:c0a8:3107]) (user=hskinnemoen job=sendgmr) by 2002:ad4:4b61:: with SMTP id m1mr2320198qvx.11.1601339979400; Mon, 28 Sep 2020 17:39:39 -0700 (PDT) Date: Mon, 28 Sep 2020 17:39:15 -0700 In-Reply-To: <20200929003916.4183696-1-hskinnemoen@google.com> Message-Id: <20200929003916.4183696-3-hskinnemoen@google.com> Mime-Version: 1.0 References: <20200929003916.4183696-1-hskinnemoen@google.com> X-Mailer: git-send-email 2.28.0.709.gb0816b6eb0-goog Subject: [RFC 2/3] docs/specs: IPMI device emulation: main processor To: qemu-devel@nongnu.org Cc: Avi.Fishman@nuvoton.com, kfting@nuvoton.com, joel@jms.id.au, clg@kaod.org, venture@google.com, wuhaotsh@google.com, minyard@acm.org, Havard Skinnemoen Received-SPF: pass client-ip=2607:f8b0:4864:20::749; envelope-from=3S4JyXwsKChw9KCAFF6EG6F8GG8D6.4GEI6EM-56N6DFGF8FM.GJ8@flex--hskinnemoen.bounces.google.com; helo=mail-qk1-x749.google.com X-detected-operating-system: by eggs.gnu.org: No matching host in p0f cache. That's all we know. X-Spam_score_int: -100 X-Spam_score: -10.1 X-Spam_bar: ---------- X-Spam_report: (-10.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_MED=-0.468, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, USER_IN_DEF_DKIM_WL=-7.5 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" Reply-to: Havard Skinnemoen X-Patchwork-Original-From: Havard Skinnemoen via From: "Denis V. Lunev\" via" This document is an attempt to briefly document the existing IPMI emulation support on the main processor. It provides the necessary background for the BMC-side IPMI emulation proposed by the next patch. Signed-off-by: Havard Skinnemoen --- docs/specs/index.rst | 1 + docs/specs/ipmi.rst | 100 +++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 101 insertions(+) create mode 100644 docs/specs/ipmi.rst diff --git a/docs/specs/index.rst b/docs/specs/index.rst index 1b0eb979d5..9fdb94a578 100644 --- a/docs/specs/index.rst +++ b/docs/specs/index.rst @@ -14,5 +14,6 @@ Contents: ppc-spapr-xive ppc-spapr-numa acpi_hw_reduced_hotplug + ipmi tpm acpi_hest_ghes diff --git a/docs/specs/ipmi.rst b/docs/specs/ipmi.rst new file mode 100644 index 0000000000..e0f9ab20ba --- /dev/null +++ b/docs/specs/ipmi.rst @@ -0,0 +1,100 @@ +===================== +IPMI device emulation +===================== + +QEMU supports emulating many types of machines. This includes machines that may +serve as the main processor in an IPMI system, e.g. x86 or POWER server +processors, as well as machines emulating ARM-based Baseband Management +Controllers (BMCs), e.g. AST2xxx or NPCM7xxx systems-on-chip. + +Main processor emulation +======================== + +A server platform may include one of the following system interfaces for +communicating with a BMC: + +* A Keyboard Controller Style (KCS) Interface, accessible via ISA + (``isa-ipmi-kcs``) or PCI (``pci-ipmi-kcs``). +* A Block Transfer (BT) Interface, accessible via ISA (``isa-ipmi-bt``) or PCI + (``pci-ipmi-bt``). +* An SMBus System Interface (SSIF; ``smbus-ipmi``). + +These interfaces can all be emulated by QEMU. To emulate the behavior of the +BMC, the messaging interface emulators use one of the following backends: + +* A BMC simulator running within the QEMU process (``ipmi-bmc-sim``). +* An external BMC simulator or emulator, connected over a chardev + (``ipmi-bmc-extern``). `ipmi_sim + `_ + from OpenIPMI is an example external BMC emulator. + +The following diagram shows how these entities relate to each other. + +.. blockdiag:: + + blockdiag main_processor_ipmi { + orientation = portrait + default_group_color = "none"; + class msgif [color = lightblue]; + class bmc [color = salmon]; + + ipmi_sim [color="aquamarine", label="External BMC"] + ipmi-bmc-extern <-> ipmi_sim [label="chardev"]; + + group { + orientation = portrait + + ipmi-interface <-> ipmi-bmc; + + group { + orientation = portrait + + ipmi-interface [class = "msgif"]; + isa-ipmi-kcs [class="msgif", stacked]; + + ipmi-interface <- isa-ipmi-kcs [hstyle = generalization]; + } + + + group { + orientation = portrait + + ipmi-bmc [class = "bmc"]; + ipmi-bmc-sim [class="bmc"]; + ipmi-bmc-extern [class="bmc"]; + + ipmi-bmc <- ipmi-bmc-sim [hstyle = generalization]; + ipmi-bmc <- ipmi-bmc-extern [hstyle = generalization]; + } + + } + } + +IPMI System Interfaces +---------------------- + +The system software running on the main processor may use a *system interface* +to communicate with the BMC. These are hardware devices attached to an ISA, PCI +or i2c bus, and in QEMU, they all need to implement ``ipmi-interface``. +This allows a BMC implementation to interact with the system interface in a +standard way. + +IPMI BMC +-------- + +The system interface devices delegate emulation of BMC behavior to a BMC +device, that is a subclass of ``ipmi-bmc``. This type of device is called +a BMC because that's what it looks like to the main processor guest software. + +The BMC behavior may be simulated within the qemu process (``ipmi-bmc-sim``) or +further delegated to an external emulator, or a real BMC. The +``ipmi-bmc-extern`` device has a required ``chardev`` property which specifies +the communications channel to the external BMC. + +Wire protocol +============= + +The wire protocol used between ``ipmi-bmc-extern`` and the external BMC +emulator is defined by `README.vm +`_ from +the OpenIPMI project.