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[23.128.96.18]) by mx.google.com with ESMTP id g187si2666095pgc.217.2021.10.20.05.24.12; Wed, 20 Oct 2021 05:24:28 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; dkim=pass header.i=@gmail.com header.s=20210112 header.b=M5OAz7D3; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=QUARANTINE dis=NONE) header.from=gmail.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230160AbhJTMZT (ORCPT + 99 others); Wed, 20 Oct 2021 08:25:19 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50526 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229941AbhJTMZT (ORCPT ); Wed, 20 Oct 2021 08:25:19 -0400 Received: from mail-oo1-xc33.google.com (mail-oo1-xc33.google.com [IPv6:2607:f8b0:4864:20::c33]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E4E0EC06161C; Wed, 20 Oct 2021 05:23:04 -0700 (PDT) Received: by mail-oo1-xc33.google.com with SMTP id r4-20020a4aa2c4000000b002b6f374cac9so1952134ool.6; Wed, 20 Oct 2021 05:23:04 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=KnpSTKaVxWeLwjg6JGO5JCxJHBUSE+8ki8bjGqS/oL8=; b=M5OAz7D3STdY5Eqg6qqLhbe94UPlkuJP16z1PvrH0eg7gGN73m4BUVPD1LEmD0QCGI sFCx5+aLAfHx1a9ivYk2Q83QJCG7gQIyf8Ga1yWdJrk7pJs7ZQlMCyUl4k7O3zaJ137w GgRCFgalWPmorsJmNOV02gkdHI/ILvFuQvaPMMwY0iZCEQIAkgnK4vkun4zD7nqoRtdu v6XxV951i7bMR/OoLkEbQ1Mvq4mREZAmpxBnSyqWyv/V0EJOQbWwX48iUsG5qYxxlyMQ 5Y3pO0F2EJ+MhKH3QAcJsYO/rjMvh/I7bT6up2YcMmlvdOUA0OpBvaB0kN27B9kV4NjD Dp8w== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=KnpSTKaVxWeLwjg6JGO5JCxJHBUSE+8ki8bjGqS/oL8=; b=oN/+CHAH5elso2jSBRfABMYyUKzr6tOlQdpa7OflLhoGd8lvem2omsSucdB1zeIkjY 0ni4Nk/acjBzHvxkWJMuNswl2Fu3V+HeEGkkzU8z58YEzn6jxM+n1Lru0slFKfE+0JKD 1stHYju1upAYwBAaB8y5Mm1CegY/pD1uWg2vuDL+A2rrAUV4VltJt7v4dyQFltFvow5c K46KiZlquCR8YGExaCqPJh1z1dwhd9KhhIcLPR7nlrXqNAoHEo7HTYOy62mvAimHox0W aqkUUQNGyMQ7H8thVNgwv4+uKAQRr0YpuRZLdeJUfvhuPvuC6xXZFCCeML/wjbr3ku3p /9qw== X-Gm-Message-State: AOAM532ozf78tQgYRdWAAtPwCvhXJQgoA6CgDOF0/PPDRRThliFUYykc kG8shNUjvpN79CCQxwr+fX6kde0+aJt08hC3kEQ= X-Received: by 2002:a4a:52ce:: with SMTP id d197mr9487161oob.83.1634732584377; Wed, 20 Oct 2021 05:23:04 -0700 (PDT) MIME-Version: 1.0 References: <20211020120726.4022086-1-pizhenwei@bytedance.com> In-Reply-To: <20211020120726.4022086-1-pizhenwei@bytedance.com> From: Wanpeng Li Date: Wed, 20 Oct 2021 20:22:53 +0800 Message-ID: Subject: Re: [PATCH] x86/kvm: Introduce boot parameter no-kvm-pvipi To: zhenwei pi Cc: Paolo Bonzini , Jonathan Corbet , Wanpeng Li , Sean Christopherson , LKML , linux-doc@vger.kernel.org Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, 20 Oct 2021 at 20:08, zhenwei pi wrote: > > Although host side exposes KVM PV SEND IPI feature to guest side, > guest should still have a chance to disable it. > > A typicall case of this parameter: > If the host AMD server enables AVIC feature, the flat mode of APIC > get better performance in the guest. Hmm, I didn't find enough valuable information in your posting. We observe AMD a lot before. https://lore.kernel.org/all/CANRm+Cx597FNRUCyVz1D=B6Vs2GX3Sw57X7Muk+yMpi_hb+v1w@mail.gmail.com/T/#u Wanpeng