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=-13.3 required=3.0 tests=BAYES_00,DKIMWL_WL_MED, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_IN_DEF_DKIM_WL 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 0791AC433ED for ; Wed, 12 May 2021 14:42:03 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C5420613E9 for ; Wed, 12 May 2021 14:42:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231218AbhELOnK (ORCPT ); Wed, 12 May 2021 10:43:10 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36904 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230202AbhELOnJ (ORCPT ); Wed, 12 May 2021 10:43:09 -0400 Received: from mail-pl1-x630.google.com (mail-pl1-x630.google.com [IPv6:2607:f8b0:4864:20::630]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D38BAC061574 for ; Wed, 12 May 2021 07:42:01 -0700 (PDT) Received: by mail-pl1-x630.google.com with SMTP id t4so12635753plc.6 for ; Wed, 12 May 2021 07:42:01 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to; bh=wxKnnXHLSQ34iKMEdRBK5f1OVmjNy6I5PUfRGXqvHB8=; b=lgF1HeKxk78Sh5QaJh95BabfBOw9mQdN47Dv/DglN2CsiJ5IZah3CZe0NGHlcvvUwD T315M+jOeTswJWnbg7FKc2JtTuuLPA1WzNzw3INIE9oGhfwoIM2bc/9Iypvee2YmXFB6 v3VBetJftdb2T4minGSdscKkZZHBYNSypYnxixXA1onKtY5vYo8WRF9YNGNetkEve+9D iuZ+k6w3fa3IMCzRfaCB5NYeYDkrsI9hLC+/dFRRoxz6RDWXUgAyXf4rODsmsOrHr1/I OSItkRJg3dRb/b9xfHOQfFL3NN8NPfCKMldNXi2kS/9WMk0VzKmOAJO1fjL4Ns9pkZkp +CWQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to; bh=wxKnnXHLSQ34iKMEdRBK5f1OVmjNy6I5PUfRGXqvHB8=; b=LD4KQW5LMDpS+NU3oCtMDsy19HUUiXyEt1F6rbmA8aC00vrAkQYwpYkNmvYqCrQ0hn cjDHFndpU4knowT3NdPUBhxiaqQ3cldrFwqddTCY4NdlbFu8/uT0+bA2e4XVkN+wUPFr C8n88CUwHXLEE8CjokjDLFGEgicpXzHzy8JapNNXL1m8PNg1nsiMlM2vWZb6m3xV+vOr iE/HgMzKKz6Q+/o5mXdjteg1F75WEC3kpsICZvodxwHo3VK5Olla/bVn3n5nntib23ql JpeAAuwZaXkJk0dYD1hYgyrVf5mRJ9ZrLVy09KAaUHg1f9psk7yu+PUgj0KSXSvx1YI4 ngXA== X-Gm-Message-State: AOAM532PitpsAMx/X2jdKklGc8jgUiujPlyxHKsp06+1zM67B+i/qqX5 aC+MzS3j5RmKkRxKYPoVQ+xXOwGP6rzcGw== X-Google-Smtp-Source: ABdhPJyX02G/Ehe0+iGqUwrV9fQJoo2Z31ZTHpkNU11jEKoGtvNI1dKljZg7sCMCQuoicrJc3uxChQ== X-Received: by 2002:a17:902:e5cb:b029:ed:64d5:afee with SMTP id u11-20020a170902e5cbb02900ed64d5afeemr35282305plf.41.1620830521252; Wed, 12 May 2021 07:42:01 -0700 (PDT) Received: from google.com (240.111.247.35.bc.googleusercontent.com. [35.247.111.240]) by smtp.gmail.com with ESMTPSA id j4sm1111598pjm.10.2021.05.12.07.42.00 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 12 May 2021 07:42:00 -0700 (PDT) Date: Wed, 12 May 2021 14:41:56 +0000 From: Sean Christopherson To: Marcelo Tosatti Cc: Peter Xu , Paolo Bonzini , kvm@vger.kernel.org, Alex Williamson , Pei Zhang Subject: Re: [patch 4/4] KVM: VMX: update vcpu posted-interrupt descriptor when assigning device Message-ID: References: <20210507220831.GA449495@fuller.cnet> <20210511145157.GC124427@fuller.cnet> <20210511171810.GA162107@fuller.cnet> <20210511235124.GA187296@fuller.cnet> <20210512000259.GA192145@fuller.cnet> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20210512000259.GA192145@fuller.cnet> Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org On Tue, May 11, 2021, Marcelo Tosatti wrote: > > The KVM_REQ_UNBLOCK patch will resume execution even any such event > > even without any such event > > > occuring. So the behaviour would be different from baremetal. I agree with Marcelo, we don't want to spuriously unhalt the vCPU. It's legal, albeit risky, to do something like hlt /* #UD to triple fault if this CPU is awakened. */ ud2 when offlining a CPU, in which case the spurious wake event will crash the guest.