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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 1A264C4332F for ; Mon, 17 Oct 2022 18:05:38 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230500AbiJQSFg (ORCPT ); Mon, 17 Oct 2022 14:05:36 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47862 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230022AbiJQSFe (ORCPT ); Mon, 17 Oct 2022 14:05:34 -0400 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 733C752476 for ; Mon, 17 Oct 2022 11:05:33 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1666029932; 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: in-reply-to:in-reply-to:references:references; bh=vF2sJeqK33WsJwhgwCfRKMDWgTW/4ftrca8DnXxxZ2M=; b=FUOH/PR53LEaqUKyY1Ju3zseBtwOeWVFj1C5hmpbdmJAuc4HwVh1a/bW6E5xnqPi184KON 0P9zQPxnIpPFHtU+FZ9qM7stGxmdjiBuOITHxcLBzeYWoxdcY0k91rt1K8pD2Ze+CqGhRG nHEoE8QADcGmxFgVguoXXSzr9uTQ9ns= Received: from mail-qv1-f70.google.com (mail-qv1-f70.google.com [209.85.219.70]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_128_GCM_SHA256) id us-mta-141-9hmWn5DQO7-Xyj6h_ezucA-1; Mon, 17 Oct 2022 14:05:31 -0400 X-MC-Unique: 9hmWn5DQO7-Xyj6h_ezucA-1 Received: by mail-qv1-f70.google.com with SMTP id jn13-20020ad45ded000000b004b1d055fbc7so7206161qvb.2 for ; Mon, 17 Oct 2022 11:05:31 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=in-reply-to:content-disposition:mime-version:references:message-id :subject:cc:to:from:date:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to; bh=vF2sJeqK33WsJwhgwCfRKMDWgTW/4ftrca8DnXxxZ2M=; b=CBsTNC1aOi9t1VZwKUkYLeD7PRJSqo2NpMlDQjMwH6M2JU+3y05A6K2EXw8DbvcptA gpz8gQzZjn2sOAWo4ur3Eyr7zIQdw1vb+3eblbekE3SMxlw+ji684Bh44Yopro0RLxiC g+MTrZXRkqHiLmyOfH2D4SO2QVGyi+yjdwXyTRMPIL41eSmJsqiszXP67iMrTUovqyOs XJfSOiRiRmC6g8C9mp3Hy+y1DOer3oFc30+elHmtoV3o9852RdhD5BX8/CO23My3Zj7p 8fqlzK6ePH2jYbeOG+DHztDoTeuyZpo4RkWVwRdyM9Qd1VERTlnPCdcsJT/DOg2lX8vB C7mA== X-Gm-Message-State: ACrzQf2mcE1Zj1DVA4CqBGGSwT7gFK58MdfLbImPP/nstdk8fU8Fpg92 wHwdeKrsMLm7GhVvZn2H91tu/UJYtn4tkWpKdr6tCHpAbmpcAzOOdb1PuHT4CYw6vqEovYAfHxi DzZpb/XVtqBQ7oGlK6+xB7J1a X-Received: by 2002:ac8:5712:0:b0:39c:cd48:25e4 with SMTP id 18-20020ac85712000000b0039ccd4825e4mr9992177qtw.581.1666029930688; Mon, 17 Oct 2022 11:05:30 -0700 (PDT) X-Google-Smtp-Source: AMsMyM6v13ETi7WQxtjbfJxiZi3n2hqXB77q4ok2HffXpTCqHix03f7jC+/5+q6Iuh/ZG1uAP9siBg== X-Received: by 2002:ac8:5712:0:b0:39c:cd48:25e4 with SMTP id 18-20020ac85712000000b0039ccd4825e4mr9992156qtw.581.1666029930457; Mon, 17 Oct 2022 11:05:30 -0700 (PDT) Received: from x1n (bras-base-aurron9127w-grc-46-70-31-27-79.dsl.bell.ca. [70.31.27.79]) by smtp.gmail.com with ESMTPSA id u10-20020ac8750a000000b0039764587192sm281196qtq.57.2022.10.17.11.05.29 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 17 Oct 2022 11:05:29 -0700 (PDT) Date: Mon, 17 Oct 2022 14:05:28 -0400 From: Peter Xu To: Hou Wenlong Cc: kvm@vger.kernel.org, Sean Christopherson , Paolo Bonzini , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, "H. Peter Anvin" , linux-kernel@vger.kernel.org Subject: Re: [PATCH v2 1/2] KVM: x86: Reduce refcount if single_open() fails in kvm_mmu_rmaps_stat_open() Message-ID: References: <5ddb7c97d2f1edbd000020aa842b0619374e6951.1665975828.git.houwenlong.hwl@antgroup.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <5ddb7c97d2f1edbd000020aa842b0619374e6951.1665975828.git.houwenlong.hwl@antgroup.com> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Oct 17, 2022 at 11:06:09AM +0800, Hou Wenlong wrote: > Refcount is increased before calling single_open() in > kvm_mmu_rmaps_stat_open(), If single_open() fails, refcount should be > restored, otherwise the vm couldn't be destroyed. > > Fixes: 3bcd0662d66fd ("KVM: X86: Introduce mmu_rmaps_stat per-vm debugfs file") > Signed-off-by: Hou Wenlong Reviewed-by: Peter Xu Thanks, -- Peter Xu