From patchwork Wed May 11 22:32:07 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andrea Parri X-Patchwork-Id: 12846693 X-Patchwork-Delegate: lorenzo.pieralisi@arm.com 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3E2E6C433EF for ; Wed, 11 May 2022 22:32:34 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1348793AbiEKWcd (ORCPT ); Wed, 11 May 2022 18:32:33 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59040 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1348790AbiEKWc3 (ORCPT ); Wed, 11 May 2022 18:32:29 -0400 Received: from mail-ej1-x630.google.com (mail-ej1-x630.google.com [IPv6:2a00:1450:4864:20::630]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 887666352A; Wed, 11 May 2022 15:32:28 -0700 (PDT) Received: by mail-ej1-x630.google.com with SMTP id m20so6719425ejj.10; Wed, 11 May 2022 15:32:28 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=KBRuCmP2siWBRF1mJGIqu92AfzuFsib8CXOarE94Pec=; b=n2QnsrARZfRY2HojclW+Ojnkv82EmY9t8X1xvOClhSc9hBsIdUTj18Qqr5glQ49f2u xkvhWUhbW8uUjKrlcLSeiIS6AUV2FeHJMeoL8+AICZolXzMg9dsk1nRznkSdUSqbGJwa IDgj7Qbl/PG5cyyRWLnz+FGPUIcCBvgSMOA+QJ9SRIq9NP1rmwx/onl/+JD/TXuQrSRy JEAIJOPV8vxa0OADNhYNZqgjw4Bk7PSkw6yzWPWmOwcoseXQJwmrWeS1fiZof8VqOLHR k187oZoebyLihXoeQY9krZktcX8rUHhtaml9T2qOdVyWgYRgWqJ6huJf6kyUfqOUvpNy xojw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=KBRuCmP2siWBRF1mJGIqu92AfzuFsib8CXOarE94Pec=; b=zlvFFN9tLXmg9xsB2gBNKO3skue8RMqlHX/z8hocrUaffeY8KAUeqRqxeZeeym4Z+z DGBJTjIuDieu53GCfbDMsBe0vtX3SSDHyTmIyZo8k9yeG8P+p09rV/peno/bq+LslCxp fyfAlihK5G9G2X7fIG6+QW6M3V5Gg4/Ogsm/a5H2g898Wijmvw6YeFsrz173YAlgVckI D/w7bOVgreMb91q7tMmo2EPpMRvHu+6DYUVM8lWOxvqwq46tDELDJLXfpf8yM8unNWuA u32Uh6ziekyMIE9Zo/k9yC9VWe3pTYuUEDBm3vHf35jFO3NqhaXML6XqaSkiOFFl7aiC qjkA== X-Gm-Message-State: AOAM532TDewYaQS2flcbsgaWnEXFANybRwoEnJQQWkgnRqMiIHAgOHAM RtZ9P4Aw6PCP4acMclj2IYU= X-Google-Smtp-Source: ABdhPJzvE2W+LU+8iVBW8Ghx0/iWtRXQlPYrP1RxK1o32UgdLkTxBTZlS+vImiPkDg5Ioe0IqYeYqg== X-Received: by 2002:a17:906:6a10:b0:6f5:5e4:9d5 with SMTP id qw16-20020a1709066a1000b006f505e409d5mr26598518ejc.122.1652308347095; Wed, 11 May 2022 15:32:27 -0700 (PDT) Received: from anparri.mshome.net (host-79-30-69-23.retail.telecomitalia.it. [79.30.69.23]) by smtp.gmail.com with ESMTPSA id f1-20020a1709064dc100b006fa84a0af2asm1468456ejw.16.2022.05.11.15.32.25 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 11 May 2022 15:32:26 -0700 (PDT) From: "Andrea Parri (Microsoft)" To: KY Srinivasan , Haiyang Zhang , Stephen Hemminger , Wei Liu , Dexuan Cui , Michael Kelley , Lorenzo Pieralisi , Rob Herring , Krzysztof Wilczynski , Bjorn Helgaas Cc: linux-hyperv@vger.kernel.org, linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, "Andrea Parri (Microsoft)" Subject: [PATCH v2 2/2] PCI: hv: Fix synchronization between channel callback and hv_pci_bus_exit() Date: Thu, 12 May 2022 00:32:07 +0200 Message-Id: <20220511223207.3386-3-parri.andrea@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220511223207.3386-1-parri.andrea@gmail.com> References: <20220511223207.3386-1-parri.andrea@gmail.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org [ Similarly to commit a765ed47e4516 ("PCI: hv: Fix synchronization between channel callback and hv_compose_msi_msg()"): ] The (on-stack) teardown packet becomes invalid once the completion timeout in hv_pci_bus_exit() has expired and hv_pci_bus_exit() has returned. Prevent the channel callback from accessing the invalid packet by removing the ID associated to such packet from the VMbus requestor in hv_pci_bus_exit(). Signed-off-by: Andrea Parri (Microsoft) Reviewed-by: Michael Kelley --- drivers/pci/controller/pci-hyperv.c | 26 +++++++++++++++++++------- 1 file changed, 19 insertions(+), 7 deletions(-) diff --git a/drivers/pci/controller/pci-hyperv.c b/drivers/pci/controller/pci-hyperv.c index a06e2cf946580..db814f7b93baa 100644 --- a/drivers/pci/controller/pci-hyperv.c +++ b/drivers/pci/controller/pci-hyperv.c @@ -3664,6 +3664,7 @@ static int hv_pci_probe(struct hv_device *hdev, static int hv_pci_bus_exit(struct hv_device *hdev, bool keep_devs) { struct hv_pcibus_device *hbus = hv_get_drvdata(hdev); + struct vmbus_channel *chan = hdev->channel; struct { struct pci_packet teardown_packet; u8 buffer[sizeof(struct pci_message)]; @@ -3671,13 +3672,14 @@ static int hv_pci_bus_exit(struct hv_device *hdev, bool keep_devs) struct hv_pci_compl comp_pkt; struct hv_pci_dev *hpdev, *tmp; unsigned long flags; + u64 trans_id; int ret; /* * After the host sends the RESCIND_CHANNEL message, it doesn't * access the per-channel ringbuffer any longer. */ - if (hdev->channel->rescind) + if (chan->rescind) return 0; if (!keep_devs) { @@ -3714,16 +3716,26 @@ static int hv_pci_bus_exit(struct hv_device *hdev, bool keep_devs) pkt.teardown_packet.compl_ctxt = &comp_pkt; pkt.teardown_packet.message[0].type = PCI_BUS_D0EXIT; - ret = vmbus_sendpacket(hdev->channel, &pkt.teardown_packet.message, - sizeof(struct pci_message), - (unsigned long)&pkt.teardown_packet, - VM_PKT_DATA_INBAND, - VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); + ret = vmbus_sendpacket_getid(chan, &pkt.teardown_packet.message, + sizeof(struct pci_message), + (unsigned long)&pkt.teardown_packet, + &trans_id, VM_PKT_DATA_INBAND, + VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED); if (ret) return ret; - if (wait_for_completion_timeout(&comp_pkt.host_event, 10 * HZ) == 0) + if (wait_for_completion_timeout(&comp_pkt.host_event, 10 * HZ) == 0) { + /* + * The completion packet on the stack becomes invalid after + * 'return'; remove the ID from the VMbus requestor if the + * identifier is still mapped to/associated with the packet. + * + * Cf. hv_pci_onchannelcallback(). + */ + vmbus_request_addr_match(chan, trans_id, + (unsigned long)&pkt.teardown_packet); return -ETIMEDOUT; + } return 0; }