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=-7.3 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 53284C43461 for ; Thu, 8 Apr 2021 12:37:54 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2861A610CF for ; Thu, 8 Apr 2021 12:37:54 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231352AbhDHMiD (ORCPT ); Thu, 8 Apr 2021 08:38:03 -0400 Received: from us-smtp-delivery-124.mimecast.com ([216.205.24.124]:25852 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231158AbhDHMiC (ORCPT ); Thu, 8 Apr 2021 08:38:02 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1617885470; 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=69zA1bhHptdUoU8kGQcTxZKNjzEk/X7EQu4AbY435gw=; b=JgWb/lOOMHWA5V3U+B+xDkfP86hjxDxD7hYxCElBE2F2k/Zd8EszgoAdaD5CaPc7CabIT0 xilmywEsPS+GK+Frhm0U/+Yo2dS8zx4Xx4cJbAewaBQQwOejCC8BCqVcQ1PAusr/q6yW0L JLUTB9JGrzRJ4LNbLhrEFSMoKtGs/eI= Received: from mail-ed1-f69.google.com (mail-ed1-f69.google.com [209.85.208.69]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-467-FIEg1IUaPDqmkbFW4Dq2-g-1; Thu, 08 Apr 2021 08:37:49 -0400 X-MC-Unique: FIEg1IUaPDqmkbFW4Dq2-g-1 Received: by mail-ed1-f69.google.com with SMTP id l11so966842edb.2 for ; Thu, 08 Apr 2021 05:37:48 -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=69zA1bhHptdUoU8kGQcTxZKNjzEk/X7EQu4AbY435gw=; b=h9vMvLwknWXODyP6jU0r+L6mrHiBvRpBLDE3yrPbgDaQ3YmWVzkX2OVAa9rtMuwKjd UASxYhS43t2CXQvAIJ1+I7udm1J/ymHJDkBKq5C9BsmQQr/aeElnqhwe0B2pa48Wn0ne 6Fpa0VxguMjHwNV2ZcJh+pi/3XwQd5jr5L1Ef6b0/ZtHojxDHmwlOhPdUithgMp+BER2 0sJLjgQno6kT6bU/0SsINnS4PqCNtvgz2mfr4Bqx/l9Rs8CkVppQyYHy8TCxK6/qkztE gNpgpC4p2P4Zu0STTcJ+uL36bcFw7RD5T+G/LOgiAywDhza6iGQSjnKqdvepsNXEMvdL kgQQ== X-Gm-Message-State: AOAM530y8sg1OlX0p7UsChW04o+zMRFVo6osJs3bpPqqHP8vKVHvpxXk uCLM4nMA5nAzQnWobQ7ztG/nYnCj68io6i97GRjI9J33slYxfg4M1n5I0BRWzFCeclIs8EIwnSr ZCZjFLG1Z2cLIBJiwQkFs9xyI X-Received: by 2002:a05:6402:8d0:: with SMTP id d16mr11466691edz.188.1617885467876; Thu, 08 Apr 2021 05:37:47 -0700 (PDT) X-Google-Smtp-Source: ABdhPJw76kziLfjbuXhsqlp1TrtaLd1hK1hbVJFzsqDBDTZxforS60mer4C1Apk6o11RACcFo9O6+w== X-Received: by 2002:a05:6402:8d0:: with SMTP id d16mr11466668edz.188.1617885467742; Thu, 08 Apr 2021 05:37:47 -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 v8sm17388506edc.30.2021.04.08.05.37.46 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 08 Apr 2021 05:37:47 -0700 (PDT) Subject: Re: [PATCH 3/4] KVM: x86: kvm_hv_flush_tlb use inputs from XMM registers To: Vitaly Kuznetsov , Siddharth Chandrasekaran Cc: Alexander Graf , Evgeny Iakovlev , kvm@vger.kernel.org, linux-kernel@vger.kernel.org, Sean Christopherson , Wanpeng Li , Jim Mattson , Joerg Roedel , Thomas Gleixner , Ingo Molnar , Borislav Petkov , x86@kernel.org, "H. Peter Anvin" References: <20210407211954.32755-1-sidcha@amazon.de> <20210407211954.32755-4-sidcha@amazon.de> <87eefl7zp4.fsf@vitty.brq.redhat.com> From: Paolo Bonzini Message-ID: <01fc0ac9-f159-d3df-6c8c-8f8122fe31ea@redhat.com> Date: Thu, 8 Apr 2021 14:37:45 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.7.0 MIME-Version: 1.0 In-Reply-To: <87eefl7zp4.fsf@vitty.brq.redhat.com> 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 08/04/21 14:01, Vitaly Kuznetsov wrote: > > Also, we can probably defer kvm_hv_hypercall_read_xmm() until we know > how many regs we actually need to not read them all (we will always > need xmm[0] I guess so we can as well read it here). The cost is get/put FPU, so I think there's not much to gain from that. Paolo