From patchwork Mon May 25 08:45:11 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Hildenbrand X-Patchwork-Id: 11568289 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 F24E4912 for ; Mon, 25 May 2020 08:46:11 +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 C92EB206DD for ; Mon, 25 May 2020 08:46:11 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="LoNCfsSE" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org C92EB206DD Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Received: from localhost ([::1]:37794 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jd8kM-00047C-Uz for patchwork-qemu-devel@patchwork.kernel.org; Mon, 25 May 2020 04:46:10 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:42238) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1jd8jg-0003Cx-Ej for qemu-devel@nongnu.org; Mon, 25 May 2020 04:45:28 -0400 Received: from us-smtp-delivery-1.mimecast.com ([207.211.31.120]:42818 helo=us-smtp-1.mimecast.com) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA1:256) (Exim 4.90_1) (envelope-from ) id 1jd8je-0006Rh-NH for qemu-devel@nongnu.org; Mon, 25 May 2020 04:45:28 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1590396325; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding; bh=yx60i0P+Y5+yL9Gfm4qdTuySFgAk/O7/ZnCKS/1J1OU=; b=LoNCfsSE7agP5MUMWuqiXkuaMOWlyTQp5zykqxaRyIXnJZSrh/oKijlqU9vjb2+OqpeRFO fF2lDR1oV87DD0HD0sfJVFpu1WDKVc78ugbNZ2n5El79Ya1Dp+ebx+9/sowZcEsFTFVEVz MaKKEZXM+86/HzPUwo2xFBPpNzw7IQU= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-251-dmip5IV0P9maGeV_BwLQeQ-1; Mon, 25 May 2020 04:45:21 -0400 X-MC-Unique: dmip5IV0P9maGeV_BwLQeQ-1 Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.phx2.redhat.com [10.5.11.14]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id C705C108BD0A; Mon, 25 May 2020 08:45:19 +0000 (UTC) Received: from t480s.redhat.com (ovpn-113-237.ams2.redhat.com [10.36.113.237]) by smtp.corp.redhat.com (Postfix) with ESMTP id 006975D9C5; Mon, 25 May 2020 08:45:11 +0000 (UTC) From: David Hildenbrand To: qemu-devel@nongnu.org Subject: [PATCH v1] pc: Support coldplugging of virtio-pmem-pci devices on all buses Date: Mon, 25 May 2020 10:45:11 +0200 Message-Id: <20200525084511.51379-1-david@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Received-SPF: pass client-ip=207.211.31.120; envelope-from=david@redhat.com; helo=us-smtp-1.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/05/25 01:54:11 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001 autolearn=_AUTOLEARN 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: Pankaj Gupta , Eduardo Habkost , David Hildenbrand , "Michael S. Tsirkin" , Paolo Bonzini , Igor Mammedov , Vivek Goyal , Richard Henderson Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" E.g., with "pc-q35-4.2", trying to coldplug a virtio-pmem-pci devices results in "virtio-pmem-pci not supported on this bus" Reasons is, that the bus does not support hotplug and, therefore, does not have a hotplug handler. Let's allow coldplugging virtio-pmem devices on such buses. The hotplug order is only relevant for virtio-pmem-pci when the guest is already alive and the device is visible before memory_device_plug() wired up the memory device bits. Hotplug attempts will still fail with: "Error: Bus 'pcie.0' does not support hotplugging" Hotunplug attempts will still fail with: "Error: Bus 'pcie.0' does not support hotplugging" Reported-by: Vivek Goyal Cc: Pankaj Gupta Cc: Igor Mammedov Cc: Paolo Bonzini Cc: Richard Henderson Cc: Eduardo Habkost Cc: "Michael S. Tsirkin" Cc: Marcel Apfelbaum Signed-off-by: David Hildenbrand Reviewed-by: Pankaj Gupta --- hw/i386/pc.c | 18 ++++++++++-------- 1 file changed, 10 insertions(+), 8 deletions(-) diff --git a/hw/i386/pc.c b/hw/i386/pc.c index 2128f3d6fe..c740495eb6 100644 --- a/hw/i386/pc.c +++ b/hw/i386/pc.c @@ -1663,13 +1663,13 @@ static void pc_virtio_pmem_pci_pre_plug(HotplugHandler *hotplug_dev, HotplugHandler *hotplug_dev2 = qdev_get_bus_hotplug_handler(dev); Error *local_err = NULL; - if (!hotplug_dev2) { + if (!hotplug_dev2 && dev->hotplugged) { /* * Without a bus hotplug handler, we cannot control the plug/unplug - * order. This should never be the case on x86, however better add - * a safety net. + * order. We should never reach this point when hotplugging on x86, + * however, better add a safety net. */ - error_setg(errp, "virtio-pmem-pci not supported on this bus."); + error_setg(errp, "virtio-pmem-pci hotplug not supported on this bus."); return; } /* @@ -1678,7 +1678,7 @@ static void pc_virtio_pmem_pci_pre_plug(HotplugHandler *hotplug_dev, */ memory_device_pre_plug(MEMORY_DEVICE(dev), MACHINE(hotplug_dev), NULL, &local_err); - if (!local_err) { + if (!local_err && hotplug_dev2) { hotplug_handler_pre_plug(hotplug_dev2, dev, &local_err); } error_propagate(errp, local_err); @@ -1696,9 +1696,11 @@ static void pc_virtio_pmem_pci_plug(HotplugHandler *hotplug_dev, * device bits. */ memory_device_plug(MEMORY_DEVICE(dev), MACHINE(hotplug_dev)); - hotplug_handler_plug(hotplug_dev2, dev, &local_err); - if (local_err) { - memory_device_unplug(MEMORY_DEVICE(dev), MACHINE(hotplug_dev)); + if (hotplug_dev2) { + hotplug_handler_plug(hotplug_dev2, dev, &local_err); + if (local_err) { + memory_device_unplug(MEMORY_DEVICE(dev), MACHINE(hotplug_dev)); + } } error_propagate(errp, local_err); }