From patchwork Wed Sep 16 06:13:29 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Ani Sinha X-Patchwork-Id: 1364956 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org (client-ip=209.51.188.17; helo=lists.gnu.org; envelope-from=qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org; receiver=) Authentication-Results: ozlabs.org; dmarc=none (p=none dis=none) header.from=anisinha.ca Authentication-Results: ozlabs.org; dkim=fail reason="signature verification failed" (2048-bit key; unprotected) header.d=anisinha-ca.20150623.gappssmtp.com header.i=@anisinha-ca.20150623.gappssmtp.com header.a=rsa-sha256 header.s=20150623 header.b=j4uNYF1L; dkim-atps=neutral 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 ozlabs.org (Postfix) with ESMTPS id 4Brqjk0YXYz9sTv for ; Wed, 16 Sep 2020 16:21:14 +1000 (AEST) Received: from localhost ([::1]:57788 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1kIQoZ-0000oJ-Nq for incoming@patchwork.ozlabs.org; Wed, 16 Sep 2020 02:21:11 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:59476) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1kIQhu-0001ul-Na for qemu-devel@nongnu.org; Wed, 16 Sep 2020 02:14:18 -0400 Received: from mail-pf1-x42b.google.com ([2607:f8b0:4864:20::42b]:43856) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.90_1) (envelope-from ) id 1kIQhr-0005lV-AQ for qemu-devel@nongnu.org; Wed, 16 Sep 2020 02:14:18 -0400 Received: by mail-pf1-x42b.google.com with SMTP id f18so3335930pfa.10 for ; Tue, 15 Sep 2020 23:14:14 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=anisinha-ca.20150623.gappssmtp.com; s=20150623; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=Q9e5WoPP1IxGkMk/UfsIYmbQR1ZYEM3M7sDwaoDUZm8=; b=j4uNYF1LKs7De9YVYy3TSc0dYYH7KLOD6hX2jOcuqePBg47UCEoSxuruXCf9pZxi7v 82eB/tJ4hDq+OOj9BDW8AQ+SZLWwLG6+z7aFGu9VzAXFbmy6USO2vkkmLUDP2dErDcdB bXSP4nKuy5xhZJnld+41cjzUDPXajp57LtO2KLRqIRcnIWZhL/J4dwNZm6VLzT7HXvRu h8D4PqO2Jn7z+BjWvlyLBlEsfGbqRWhwMcbnYShACOzE0vt3pGfBo6XBUNsNB7At7nbp /FgrXiqUS1HlTW3bgw1lx8pNAXlJ8QGBjcAOHDNDRpKOcTKOzwMG7t01YFreNyYFoHea Eiwg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=Q9e5WoPP1IxGkMk/UfsIYmbQR1ZYEM3M7sDwaoDUZm8=; b=An1VVnm/MBBbdbCbi2VLMBAlxCS71vF9n3voRlDM16PwKsVv4yV8pc+0k+XsVXVwZS WKF9k7sU4HU1qQfZnrkkTvG2DxdTGZn3s0uS4EBGKYDikl8Zw2tTzopz/oC0SpQJ22Me 4QLM47PDkwnmIa0trMMuKL9yVQ09H9tFI6igLNvvCcgD5xYln7Di6dy4sK+3E314AdYu K7FkUno4car8SK0wcU81VdfY9lSOGZgUxGVKVCx+7g55CwA9aQaqwvGdL9AnS4FSvJYY oAXcwK8rLDrmoGrWecy4YlTznPmYVoWd9Kza3loMTHYtBUZS2RXnqDE3Iw8bzHKOVpm1 kHBw== X-Gm-Message-State: AOAM533EMb57U3btq+5Z/+5QwHPmqtRgkPOvRxWLRg8SEmyvIdtfPlFE zaZSTYe5wN8eYr7xzJfa8okhM+U2MRwSIleT X-Google-Smtp-Source: ABdhPJwkNQvagdECH5/v3VzLffJt760XTVppSAaQcv7pJttCmfCcyJ0ERSSvaZkDx5Mp7mEyhCwd2A== X-Received: by 2002:a63:1c4e:: with SMTP id c14mr16848858pgm.98.1600236853419; Tue, 15 Sep 2020 23:14:13 -0700 (PDT) Received: from localhost.localdomain ([203.163.234.244]) by smtp.googlemail.com with ESMTPSA id c20sm583164pfc.209.2020.09.15.23.14.09 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 15 Sep 2020 23:14:12 -0700 (PDT) From: Ani Sinha To: qemu-devel@nongnu.org Subject: [PATCH v4 05/11] i440fx/acpi: do not add hotplug related amls for cold plugged bridges Date: Wed, 16 Sep 2020 11:43:29 +0530 Message-Id: <20200916061335.14045-6-ani@anisinha.ca> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200916061335.14045-1-ani@anisinha.ca> References: <20200916061335.14045-1-ani@anisinha.ca> Received-SPF: none client-ip=2607:f8b0:4864:20::42b; envelope-from=ani@anisinha.ca; helo=mail-pf1-x42b.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: -18 X-Spam_score: -1.9 X-Spam_bar: - X-Spam_report: (-1.9 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, 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: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Eduardo Habkost , "Michael S. Tsirkin" , jusual@redhat.com, =?utf-8?q?Philipp?= =?utf-8?q?e_Mathieu-Daud=C3=A9?= , Aleksandar Markovic , Paolo Bonzini , Ani Sinha , Igor Mammedov , Aurelien Jarno , Richard Henderson Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" Cold plugged bridges are not hot unpluggable, even when their hotplug property (acpi-pci-hotplug-with-bridge-support) is turned off. Please see the function acpi_pcihp_pc_no_hotplug() (thanks Julia). However, with the current implementaton, windows would try to hot-unplug a pci bridge when it's hotplug switch is off. This is regardless of whether there are devices attached to the bridge. This is because we add amls like _EJ0 etc for the pci slot where the bridge is cold plugged. We have a demo video here: https://youtu.be/pME2sjyQweo In this fix, we identify a cold plugged bridge and for cold plugged bridges, we do not add the appropriate amls and acpi methods that are used by the OS to identify a hot-pluggable/unpluggable pci device. After this change, Windows does not show an option to eject the PCI bridge. A demo video is here: https://youtu.be/kbgej5B9Hgs As a result of the patch, the following are the changes to the DSDT ACPI table: @@ -858,38 +858,33 @@ Return (Zero) } Method (_S2D, 0, NotSerialized) // _S2D: S2 Device State { Return (Zero) } Method (_S3D, 0, NotSerialized) // _S3D: S3 Device State { Return (Zero) } } Device (S18) { - Name (_SUN, 0x03) // _SUN: Slot User Number Name (_ADR, 0x00030000) // _ADR: Address - Method (_EJ0, 1, NotSerialized) // _EJx: Eject Device - { - PCEJ (BSEL, _SUN) - } } Device (S20) { Name (_SUN, 0x04) // _SUN: Slot User Number Name (_ADR, 0x00040000) // _ADR: Address Method (_EJ0, 1, NotSerialized) // _EJx: Eject Device { PCEJ (BSEL, _SUN) } } Device (S28) { Name (_SUN, 0x05) // _SUN: Slot User Number Name (_ADR, 0x00050000) // _ADR: Address @@ -1148,37 +1143,32 @@ PCEJ (BSEL, _SUN) } } Device (SF8) { Name (_SUN, 0x1F) // _SUN: Slot User Number Name (_ADR, 0x001F0000) // _ADR: Address Method (_EJ0, 1, NotSerialized) // _EJx: Eject Device { PCEJ (BSEL, _SUN) } } Method (DVNT, 2, NotSerialized) { - If ((Arg0 & 0x08)) - { - Notify (S18, Arg1) - } - If ((Arg0 & 0x10)) { Notify (S20, Arg1) } If ((Arg0 & 0x20)) { Notify (S28, Arg1) } If ((Arg0 & 0x40)) { Notify (S30, Arg1) } If ((Arg0 & 0x80)) While at it, I have also updated a stale comment. This change is tested with a Windows 2012R2 guest image and Windows 2019 server guest image running on Ubuntu 18.04 host. This change is based off of upstream qemu master branch tag v5.1.0. Signed-off-by: Ani Sinha --- hw/i386/acpi-build.c | 12 ++++++------ 1 file changed, 6 insertions(+), 6 deletions(-) diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c index 7a5a8b3521..e079b686f5 100644 --- a/hw/i386/acpi-build.c +++ b/hw/i386/acpi-build.c @@ -359,6 +359,7 @@ static void build_append_pci_bus_devices(Aml *parent_scope, PCIBus *bus, int slot = PCI_SLOT(i); bool hotplug_enabled_dev; bool bridge_in_acpi; + bool cold_plugged_bridge; if (!pdev) { if (bsel) { /* add hotplug slots for non present devices */ @@ -380,15 +381,14 @@ static void build_append_pci_bus_devices(Aml *parent_scope, PCIBus *bus, pc = PCI_DEVICE_GET_CLASS(pdev); dc = DEVICE_GET_CLASS(pdev); - /* When hotplug for bridges is enabled, bridges are - * described in ACPI separately (see build_pci_bus_end). - * In this case they aren't themselves hot-pluggable. + /* + * Cold plugged bridges aren't themselves hot-pluggable. * Hotplugged bridges *are* hot-pluggable. */ - bridge_in_acpi = pc->is_bridge && pcihp_bridge_en && - !DEVICE(pdev)->hotplugged; + cold_plugged_bridge = pc->is_bridge && !DEVICE(pdev)->hotplugged; + bridge_in_acpi = cold_plugged_bridge && pcihp_bridge_en; - hotplug_enabled_dev = bsel && dc->hotpluggable && !bridge_in_acpi; + hotplug_enabled_dev = bsel && dc->hotpluggable && !cold_plugged_bridge; if (pc->class_id == PCI_CLASS_BRIDGE_ISA) { continue;