Received: by 2002:a25:e7d8:0:0:0:0:0 with SMTP id e207csp157646ybh; Fri, 6 Mar 2020 18:21:50 -0800 (PST) X-Google-Smtp-Source: ADFU+vviwTazKsIbGV8BJQYNljKBvL9C3s4RqJiguAQ8NBPx/Yt+GyLKL2zvOLwT0Cs6lhSdgYXF X-Received: by 2002:a9d:bf5:: with SMTP id 108mr348016oth.260.1583547709873; Fri, 06 Mar 2020 18:21:49 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; t=1583547709; cv=none; d=google.com; s=arc-20160816; b=OcQAL+SfrZSaWTOD/LS4l06doemYztFWmQrtx3mbGfki9FqwcTh9eBm8+tr/RIVyP8 tEFLq+2d6yBAphrJT8EeULrCNqrcvNT7u9ov9nLWE/ke0lvz0YFaQaCSflCVOrfxLGmP QX3tfp1sKjWTCzXP/RHcD3qu6RAlbsuTZy1VcuW+sy6Joe8s2KxWeq/KdmwsjWApU5F3 Y0x2DrdbCxOb8e3D+TTY8uAiiBzghLK1Pdme+7HEUQHN+nwvVYuNH6ZewtInNNrf6xCT o0A6LkZjKiIsgDfP68lnFl6rbrc3KWlXwbayy4CGCS93cQwrBN3Im7YGupOxRa2+hEWq Dikg== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:sender:cc:to:subject:message-id:date:from :in-reply-to:references:mime-version:dkim-signature; bh=Zax7unQnO5RcHW+FrTwe3k3gSQZdWn+nmr8JvvDRqww=; b=hqLAdhAxQmgbdibr5tFYjm51zWt8GjXS41ujP9P0P2xPfsgNEjxyIiymwZF3vUnur2 SXu2s38F7XalnwW0c61u7HV60Ayo0CPYuKvScDHYzns9Mb3XYI+LuwbsUAK9H6noZfD1 C2STTTJGW0Fy9696CpXvpEWIBaGF+mM/kNJJqGOvtAT2WDsuEMFIZl8Dya3UmD1SS823 kzfZJhlXjN432XH74/pJ7Mjisdd2RBbc5EtwYQwfYZeZtkkFIiAEGD+ks6cJ1xll529M 22Pl+de144Hmp6JyNf4lEbS783I1QWgQQQfIQ1O29IMmduwz0PVYuwtZm4h6iAZOTLkF Z+vQ== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@kernel.org header.s=default header.b=jcG2U+tA; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=kernel.org Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id e24si2349848otq.14.2020.03.06.18.21.37; Fri, 06 Mar 2020 18:21:49 -0800 (PST) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; dkim=pass header.i=@kernel.org header.s=default header.b=jcG2U+tA; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726682AbgCGCVV (ORCPT + 99 others); Fri, 6 Mar 2020 21:21:21 -0500 Received: from mail.kernel.org ([198.145.29.99]:56384 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726368AbgCGCVV (ORCPT ); Fri, 6 Mar 2020 21:21:21 -0500 Received: from mail-wr1-f51.google.com (mail-wr1-f51.google.com [209.85.221.51]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 45B3F20705 for ; Sat, 7 Mar 2020 02:21:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1583547680; bh=1hK61AOttKQjpFnefFnrB/B63DwRIlE6GKi1awj3rLE=; h=References:In-Reply-To:From:Date:Subject:To:Cc:From; b=jcG2U+tAucUJrcdf7foxLHER+S18d0t0CiE/qHc4WbCDY03zDroQZDGNTbLOwzBRZ uZwjv2VD42ADy0659mYmwE8RFkF7NCiqw9DpSMWcOTZU2OFObfl81htkDgn/JDoEWB FUktMHVUpGjvJ0eMU31YO23HcoOugstPiZbTxg9k= Received: by mail-wr1-f51.google.com with SMTP id v11so4471922wrm.9 for ; Fri, 06 Mar 2020 18:21:20 -0800 (PST) X-Gm-Message-State: ANhLgQ1GwpEsOrl9/Xc8+H0wF8XkqIvgPh8BxVhQNpR50e0ngj5gbk1m b5vqE/T04Mnpmh1FZh/Fo4ylX44hjKECwA2vllJGFw== X-Received: by 2002:a05:6000:1ca:: with SMTP id t10mr6716238wrx.75.1583547678734; Fri, 06 Mar 2020 18:21:18 -0800 (PST) MIME-Version: 1.0 References: <25d5c6de22cabf6a4ecb44ce077f33aa5f10b4d4.1583547371.git.luto@kernel.org> In-Reply-To: <25d5c6de22cabf6a4ecb44ce077f33aa5f10b4d4.1583547371.git.luto@kernel.org> From: Andy Lutomirski Date: Fri, 6 Mar 2020 18:21:07 -0800 X-Gmail-Original-Message-ID: Message-ID: Subject: Re: [PATCH] x86/kvm: Disable KVM_ASYNC_PF_SEND_ALWAYS To: Andy Lutomirski Cc: LKML , X86 ML , kvm list , Paolo Bonzini , stable Content-Type: text/plain; charset="UTF-8" Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Fri, Mar 6, 2020 at 6:16 PM Andy Lutomirski wrote: > > The ABI is broken and we cannot support it properly. Turn it off. > > If this causes a meaningful performance regression for someone, KVM > can introduce an improved ABI that is supportable. Ugh, disregard this patch. I flubbed the comment, and I'll send v2 shortly.