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 X-Spam-Level: X-Spam-Status: No, score=-9.8 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 734C4C433DF for ; Wed, 22 Jul 2020 16:20:06 +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 3F1AA2065F for ; Wed, 22 Jul 2020 16:20:06 +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="UuwhNOcV" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 3F1AA2065F 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+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:51550 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1jyHTR-0006kT-G6 for qemu-devel@archiver.kernel.org; Wed, 22 Jul 2020 12:20:05 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:34266) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1jyHSd-0005Se-4M for qemu-devel@nongnu.org; Wed, 22 Jul 2020 12:19:15 -0400 Received: from us-smtp-delivery-1.mimecast.com ([207.211.31.120]:21937 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 1jyHSb-0004AZ-BQ for qemu-devel@nongnu.org; Wed, 22 Jul 2020 12:19:14 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1595434752; 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: in-reply-to:in-reply-to:references:references; bh=5wpmTYikSdbjcf+/JbUC0xrPOhhmaHgwKVJRyehi4Ng=; b=UuwhNOcVddSODS65h02hhqpkErKDe0ctWzd0CZf9wgmJQju2d3YiWbSFGfjt2jR4E0gJHb xUGVPpNG64GsGb7tjQlv8jbMabXizpXPs19gvzoSbyTxyYGaN2u2QZSXgLtSX+pSd5jowc X+tq66v5Hmy3tE6YWm9B+czjK5KIg7Y= 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-323-ft2Q9X6VPUi84FgixYoiVw-1; Wed, 22 Jul 2020 12:19:09 -0400 X-MC-Unique: ft2Q9X6VPUi84FgixYoiVw-1 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.phx2.redhat.com [10.5.11.16]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 9C27159; Wed, 22 Jul 2020 16:19:06 +0000 (UTC) Received: from starship (unknown [10.35.206.82]) by smtp.corp.redhat.com (Postfix) with ESMTP id 7F4965C3F8; Wed, 22 Jul 2020 16:19:02 +0000 (UTC) Message-ID: <3c4a37263eaceffec01fb00bc9b3549a3c9df90e.camel@redhat.com> Subject: Re: [PATCH 1/1] pci/pcie: refuse another hotplug/unplug event if attention button is pending From: Maxim Levitsky To: qemu-devel@nongnu.org Date: Wed, 22 Jul 2020 19:19:01 +0300 In-Reply-To: <20200722161722.51416-2-mlevitsk@redhat.com> References: <20200722161722.51416-1-mlevitsk@redhat.com> <20200722161722.51416-2-mlevitsk@redhat.com> User-Agent: Evolution 3.36.3 (3.36.3-1.fc32) MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit Received-SPF: pass client-ip=207.211.31.120; envelope-from=mlevitsk@redhat.com; helo=us-smtp-1.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/07/22 00:40:35 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -30 X-Spam_score: -3.1 X-Spam_bar: --- X-Spam_report: (-3.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-1, 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_H4=-0.01, RCVD_IN_MSPIKE_WL=-0.01, SPF_HELO_NONE=0.001, SPF_PASS=-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: "Michael S. Tsirkin" Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On Wed, 2020-07-22 at 19:17 +0300, Maxim Levitsky wrote: > Curently it is possible to hotplug a device and then immediatly > hotunplug it before the OS notices, and that will result > in missed unplug event since we can only send one attention button event. > > Moreover the device will stuck in unplugging state forever. > > Error out in such cases and rely on the caller (e.g libvirt) to retry > the unplug a bit later > > Signed-off-by: Maxim Levitsky > --- > hw/pci/pcie.c | 11 +++++++++++ > 1 file changed, 11 insertions(+) > > diff --git a/hw/pci/pcie.c b/hw/pci/pcie.c > index 5b48bae0f6..9e836cf2f4 100644 > --- a/hw/pci/pcie.c > +++ b/hw/pci/pcie.c > @@ -402,6 +402,17 @@ static void pcie_cap_slot_plug_common(PCIDevice *hotplug_dev, DeviceState *dev, > */ > error_setg_errno(errp, EBUSY, "slot is electromechanically locked"); > } > + > + if (sltsta & PCI_EXP_SLTSTA_ABP) { > + /* > + * Attention button is pressed, thus we can't send another > + * hotpplug event Typo here, forgot to refresh the commit. > + */ > + error_setg_errno(errp, EBUSY, > + "attention button is already pressed, can't " > + "send another hotplug event"); > + } > + > } > > void pcie_cap_slot_pre_plug_cb(HotplugHandler *hotplug_dev, DeviceState *dev,