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 mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id EA432C433F5 for ; Mon, 25 Oct 2021 13:48:29 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C9ED360F46 for ; Mon, 25 Oct 2021 13:48:29 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231980AbhJYNuu (ORCPT ); Mon, 25 Oct 2021 09:50:50 -0400 Received: from us-smtp-delivery-124.mimecast.com ([216.205.24.124]:54871 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230261AbhJYNut (ORCPT ); Mon, 25 Oct 2021 09:50:49 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1635169706; 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=rAI1rvJIZVwx71e91km04CwkX5jtmNRsQSKYM+y4LQM=; b=RcUN7h3/KVcwB6CG2nyXxa0de24df0g3VfDOZrfqH/ynGLyLyDFmXnYkvZkf3l/Xy192Bw RupD1Y+KicOlz2O5kjHiwx3bttaThZ8ePhvcgYr++8Hf/XUpwmyXUFODZ+DX+NCwXtd/Hm eQB4dxnagmpWvuZtwsyzT1JmL8TEMXs= Received: from mail-wm1-f69.google.com (mail-wm1-f69.google.com [209.85.128.69]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-337-C9xeyPrCMrmlJV_ui2mvyA-1; Mon, 25 Oct 2021 09:48:24 -0400 X-MC-Unique: C9xeyPrCMrmlJV_ui2mvyA-1 Received: by mail-wm1-f69.google.com with SMTP id z20-20020a05600c221400b0032cb38a76a9so2438wml.8 for ; Mon, 25 Oct 2021 06:48:24 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:message-id:date:mime-version:user-agent:subject :content-language:to:cc:references:from:in-reply-to :content-transfer-encoding; bh=rAI1rvJIZVwx71e91km04CwkX5jtmNRsQSKYM+y4LQM=; b=viwwagiRrbZJ8tcNE2oDTDH1JTm6/Skpn22jEKwhHM/8OWcwBkCb65QEkSXUBlBKTu w3iFf5zYVz7NJ4+KUBuOqYdHYtji6vJ6TzKU5JkWuKYTiuK0tku3K4UhuJIb6yeaXwYM VnF2OOv0WMpWET+hir45AlB9zjWx0YtGGBTUBH+HscLiSSF5N9gv2YxvOrjJlsLO4+/J SdnP4aLRG1pj+JQQBWw+YJJQ5NJ3TZqNigiiiXhUFysIFeukt51BajhYKtTTrVB4jQOg 7QYVeDmVI8QHq6D7uWSAcYzab861qxXzPKsc8CEK/B4OjznCnfsPPo6l40hyrHjwi0jP AmxA== X-Gm-Message-State: AOAM5334DIOzx8FGiiGs7R/yMAKvwO/bruAfcwBTv2Lv2sgpH3PIysL4 7Ylp+iSirqGpnsjo2ATIjEEYlzeTcRWoZ9Hzc/mIP+dh6D3i4rJj6zO6WKlhlcJMYi4OKs9ZsfF 9mlypzGhorxNdlB2cavHLXGCN X-Received: by 2002:adf:d1ee:: with SMTP id g14mr24355622wrd.264.1635169703586; Mon, 25 Oct 2021 06:48:23 -0700 (PDT) X-Google-Smtp-Source: ABdhPJxvh4UiZag1iqCL0Yxmhmh7ghHaPzeCY1G7nZe+NYuublJxNb7HJYi3GJafbpt4P4VqHirR5w== X-Received: by 2002:adf:d1ee:: with SMTP id g14mr24355558wrd.264.1635169703285; Mon, 25 Oct 2021 06:48:23 -0700 (PDT) Received: from ?IPV6:2001:b07:6468:f312:c8dd:75d4:99ab:290a? ([2001:b07:6468:f312:c8dd:75d4:99ab:290a]) by smtp.gmail.com with ESMTPSA id m12sm3661638wrq.69.2021.10.25.06.48.21 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 25 Oct 2021 06:48:22 -0700 (PDT) Message-ID: <1537b693-80ee-4f9e-2c4e-6e1c62ccca92@redhat.com> Date: Mon, 25 Oct 2021 15:48:20 +0200 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.1.0 Subject: Re: [PATCH v2 20/43] KVM: VMX: Skip Posted Interrupt updates if APICv is hard disabled Content-Language: en-US To: Sean Christopherson , Marc Zyngier , Huacai Chen , Aleksandar Markovic , Paul Mackerras , Anup Patel , Paul Walmsley , Palmer Dabbelt , Albert Ou , Christian Borntraeger , Janosch Frank Cc: James Morse , Alexandru Elisei , Suzuki K Poulose , Atish Patra , David Hildenbrand , Cornelia Huck , Claudio Imbrenda , Vitaly Kuznetsov , Wanpeng Li , Jim Mattson , Joerg Roedel , linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, linux-mips@vger.kernel.org, kvm@vger.kernel.org, kvm-ppc@vger.kernel.org, kvm-riscv@lists.infradead.org, linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, David Matlack , Oliver Upton , Jing Zhang References: <20211009021236.4122790-1-seanjc@google.com> <20211009021236.4122790-21-seanjc@google.com> From: Paolo Bonzini In-Reply-To: <20211009021236.4122790-21-seanjc@google.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 09/10/21 04:12, Sean Christopherson wrote: > + /* Nothing to do if PI.SN==0 and the vCPU isn't being migrated. */ > if (!pi_test_sn(pi_desc) && vcpu->cpu == cpu) > return; This does not quite say "why", so: /* Nothing to do if PI.SN and PI.NDST both have the desired value. */ Paolo