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=-8.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,NICE_REPLY_A,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=no 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 493B6C433ED for ; Tue, 4 May 2021 21:25:33 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 232D1613CB for ; Tue, 4 May 2021 21:25:33 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232897AbhEDV00 (ORCPT ); Tue, 4 May 2021 17:26:26 -0400 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]:33967 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232684AbhEDV0Y (ORCPT ); Tue, 4 May 2021 17:26:24 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1620163528; 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=Fsp3FlXsqJBpt92Hz6adn7ap1GpuklGqqHiakX9gLLU=; b=KKA1QlhzWAhKdgS/4OWOZMoHaa+1O83Ebs414k/RRjrCspfdjLvxapvYd8S82P9QNRpaes JbhNCkt9CbaBEg3fQF0IW4G3kaRoyV6mcua1I+COW27B56E6FL2ZJ5iGja2z8yFBpo0A/Y BgrkA26jNcyjpDXxTCqk6kCiupAE8HQ= Received: from mail-ed1-f70.google.com (mail-ed1-f70.google.com [209.85.208.70]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-236-XiD8hpiSO9enG_DZwbIKSw-1; Tue, 04 May 2021 17:25:27 -0400 X-MC-Unique: XiD8hpiSO9enG_DZwbIKSw-1 Received: by mail-ed1-f70.google.com with SMTP id f8-20020a0564020688b029038840895df2so7039681edy.17 for ; Tue, 04 May 2021 14:25:27 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:subject:to:cc:references:from:message-id:date :user-agent:mime-version:in-reply-to:content-language :content-transfer-encoding; bh=Fsp3FlXsqJBpt92Hz6adn7ap1GpuklGqqHiakX9gLLU=; b=eTmJW47gfFr8v2iFOV8ErAaj5zP9xewOn1afd4qr9VKtBEfsEHAfdGHRmI+oDDHwbZ 8AxkLv4cYYYOr1upQiMujQcgN4jIB9uSeji+bzcC3mCSEMiP3RvUpJIR5cFelPp1m+Zg ZtP6jFSP7pwH2XFUqhH7M5YZfeLWWnCRaNszSuHj1IaDq+70jF15TW+LSByM0Ykz4MhW aOK/5f7qmVeglldcgwSqLF8yGsCpcTQAEJawjXGk8XD3r9vOySDJRdgKpcbHFzn7beZo ErqvHTIUZJ2pP5yYxct06WBs9lfmZzBdDorsaaDOPTTdjVDapBctPQjx8iquofGzD5kU Az5w== X-Gm-Message-State: AOAM533CXYhmbdA/C9Yy3hCiMxgkyWGD+j44FsDz5ACMNRDY/zePZN4O P3/qjy2TGRKktAc/IwF5DspF9LUb23VOZy1UyvrLD0nSF2CoBhgI0ERJEtu+/LmH6r/Mjp95UBr +mGLbTeKC4EAidev0wMmSyziD X-Received: by 2002:a17:906:edc7:: with SMTP id sb7mr23622779ejb.443.1620163526309; Tue, 04 May 2021 14:25:26 -0700 (PDT) X-Google-Smtp-Source: ABdhPJzNdRsSLIeqH6Uw0edbDZemsL8P5hNANy2svhJza8YxUf7uijluasL2a4SVjIMTg7/VSGYCKQ== X-Received: by 2002:a17:906:edc7:: with SMTP id sb7mr23622750ejb.443.1620163526099; Tue, 04 May 2021 14:25:26 -0700 (PDT) Received: from ?IPv6:2001:b07:6468:f312:5e2c:eb9a:a8b6:fd3e? ([2001:b07:6468:f312:5e2c:eb9a:a8b6:fd3e]) by smtp.gmail.com with ESMTPSA id ck4sm13977457edb.56.2021.05.04.14.25.24 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 04 May 2021 14:25:25 -0700 (PDT) Subject: Re: [PATCH] KVM/VMX: Invoke NMI non-IST entry instead of IST entry To: Andy Lutomirski , Sean Christopherson Cc: Maxim Levitsky , Thomas Gleixner , Lai Jiangshan , linux-kernel@vger.kernel.org, Lai Jiangshan , Steven Rostedt , Andi Kleen , Andy Lutomirski , Vitaly Kuznetsov , Wanpeng Li , Jim Mattson , Joerg Roedel , Josh Poimboeuf , Uros Bizjak , Ingo Molnar , Borislav Petkov , x86@kernel.org, "H. Peter Anvin" , Peter Zijlstra , Alexandre Chartre , Juergen Gross , Joerg Roedel , Jian Cai References: <38B9D60F-F24F-4910-B2DF-2A57F1060452@amacapital.net> From: Paolo Bonzini Message-ID: <625057c7-ea40-4f37-8bea-cddecfe1b855@redhat.com> Date: Tue, 4 May 2021 23:25:23 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.8.1 MIME-Version: 1.0 In-Reply-To: <38B9D60F-F24F-4910-B2DF-2A57F1060452@amacapital.net> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 04/05/21 23:23, Andy Lutomirski wrote: >> On May 4, 2021, at 2:21 PM, Sean Christopherson wrote: >> FWIW, NMIs are masked if the VM-Exit was due to an NMI. Huh, indeed: "An NMI causes subsequent NMIs to be blocked, but only after the VM exit completes". > Then this whole change is busted, since nothing will unmask NMIs. Revert it? Looks like the easiest way out indeed. Paolo