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 13C92C433FE for ; Mon, 25 Oct 2021 13:22:15 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E33F660F6F for ; Mon, 25 Oct 2021 13:22:14 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231428AbhJYNYc (ORCPT ); Mon, 25 Oct 2021 09:24:32 -0400 Received: from us-smtp-delivery-124.mimecast.com ([216.205.24.124]:32845 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230145AbhJYNYb (ORCPT ); Mon, 25 Oct 2021 09:24:31 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1635168129; 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=48+IikSlKyqTNmxyr4q4VEcqSYZJGRNhdXCK/IFcjJk=; b=KE/riBNfAXvmdioUpEupdNXCo16fRq3CU6y433SjTnpscTb3trlrymitszXrkgp+SEiGpy IGGDdOs7tgVpF7D1koLvgvjkFQKxcb+ae8BAvfZAtAiPQnnSY7t0w4DQ9M14UID9quLJ6O qMkZ0+yPB8SV6/WH/73VfrMRwVbUjyY= 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-341-eDXD6gsfP7asdDRO3bTLbA-1; Mon, 25 Oct 2021 09:22:08 -0400 X-MC-Unique: eDXD6gsfP7asdDRO3bTLbA-1 Received: by mail-ed1-f70.google.com with SMTP id f21-20020a0564021e9500b003dd77985601so561965edf.9 for ; Mon, 25 Oct 2021 06:22:07 -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=48+IikSlKyqTNmxyr4q4VEcqSYZJGRNhdXCK/IFcjJk=; b=Czv5kmWVOIOj9YVTgukc+k+KSt9tUXbjCzNGWPlwZfpZENRjQNVDIXQrznCcnB9Iqp QD4T4vD8yl9sQHIOLRSkfB+ilHJiheIG2Ajukhp2zUfZN4YyjuaKzn69sGNLGf+5ADON mRKqKyocyOTWObRHG9x3XnUQubg7RxPkbX9bREqeCNUBCJ+V8aPhfaX7Krj+18L2bv+u bd2fPKd7ejddDO0UrzKtEeckbQyhzBRk13cIuq+bUK2/AIjC+uhYs8lO98/CI+GlwFaD APTrOshlCGg0IWlk9dVy53c0k6o+xUoaBgS3Ak3VVNevrGvQaAWlJwraUwcNSy/Ydf0r yoeg== X-Gm-Message-State: AOAM531uwI7scs5wEmnhYRQv/y7+7+deNtELNcgfTfuA1GXog+0KSG96 HwUMmA39QL9oPokbjioQGoB3tGW/gJb7auLXGSiYtuRPQd4+WDawEuhA4yeBK+wC9qHaWDuSbd1 phQ2+XDP9cibYGMamR/cSmw== X-Received: by 2002:a50:d783:: with SMTP id w3mr20253049edi.380.1635168126979; Mon, 25 Oct 2021 06:22:06 -0700 (PDT) X-Google-Smtp-Source: ABdhPJzfRKsXz9JGMpnMaISmnOtZN3rndX1G8rsIOCD7EyDtzp44dz76SyjuCafVUoIKeNPaL6dxIA== X-Received: by 2002:a50:d783:: with SMTP id w3mr20253015edi.380.1635168126752; Mon, 25 Oct 2021 06:22:06 -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 j15sm9152968edl.34.2021.10.25.06.22.00 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 25 Oct 2021 06:22:06 -0700 (PDT) Message-ID: Date: Mon, 25 Oct 2021 15:21:59 +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 02/43] KVM: SVM: Ensure target pCPU is read once when signalling AVIC doorbell 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> <20211009021236.4122790-3-seanjc@google.com> From: Paolo Bonzini In-Reply-To: <20211009021236.4122790-3-seanjc@google.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-mips@vger.kernel.org On 09/10/21 04:11, Sean Christopherson wrote: > + * point, which could result in signalling the wrong/previous > + * pCPU. But if that happens the vCPU is guaranteed to do a > + * VMRUN (after being migrated) and thus will process pending > + * interrupts, i.e. a doorbell is not needed (and the spurious) ... one is harmless, I suppose. Paolo