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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id E6458C43334 for ; Thu, 7 Jul 2022 17:08:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235974AbiGGRIm (ORCPT ); Thu, 7 Jul 2022 13:08:42 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49332 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231875AbiGGRIl (ORCPT ); Thu, 7 Jul 2022 13:08:41 -0400 Received: from mail-pg1-x535.google.com (mail-pg1-x535.google.com [IPv6:2607:f8b0:4864:20::535]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6A218D10F for ; Thu, 7 Jul 2022 10:08:40 -0700 (PDT) Received: by mail-pg1-x535.google.com with SMTP id bf13so6591460pgb.11 for ; Thu, 07 Jul 2022 10:08:40 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20210112; h=date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to; bh=aDwhAz56getKu/7dUfZtUNg+bMQnNfCv/r3Lo81Gt4c=; b=OKld0gkkD90FJcYLX8kyBvnUJUDj9BzEcNLpEOkQeEoIWLEfJ2D+KLUYi5d/Q8PoU7 fjQxBXgI1cNDJZYaFxlz5v1fdwQCKeXJkZtFR5RoS/IDTRWL4cuMqkcJ9PjDItMp5wWX cQfcJhh+YhR/nZj1cqhKJ2CtyJIUuzgZP9DjYym+UVyxAz73eOTRQV8nS5lt21HahXSD ECMRqQ+Wtp5dAO9uMSd2eec76gtUdPShhuNbCQQpwn+GeFn/m/DVh17yUhgN6YfG/Awq ASzsGt9WU4hHjobp076NKKcyYMpGP+arYWU6ObtfpOJF/se0lT+3Q5og9NgLxhiDiJft Vr3A== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to; bh=aDwhAz56getKu/7dUfZtUNg+bMQnNfCv/r3Lo81Gt4c=; b=kdKth/gDD4WJWbU6WsSGGKHRv0m5xXAMG+7rt9MfR7NXd+vhFW94GIt9gZFxIqJCg3 DB3gCnq786DdYAr2lfU/drziT4gZKvbKT7Luf/pERRzHaB3QbOsnCJocgAeHVGXaxHH0 tdfnPjDH1HpCuTCWzam0WocDTtrPkutg5lmQVVn5X3L1EjoV2FjvbTjWCQaUV1TARfO5 9oow8+NWphjA4885CKyACs51DWKzZZ/XjJzFgHlyWffxzJ2SVPeaae12OdTa28JzBKc/ zuItwMTiXl9bbYjg6mSuGiBlBqC2LyW8400lKdoQptKMs/WQVKRjd3mc6sLLR9kjy2Gy 4VXw== X-Gm-Message-State: AJIora/dBwpHH1mfIjNNiuoMcuICwzKBqEgHuCZIlyGXMf8miwUR2TVd 1Vb8GF/ggEz+50YNdDLQ6rvquw== X-Google-Smtp-Source: AGRyM1ufPqH2WbJJzRXHiO3zNWh9EqE5AA0H0qB0Szi3BpKm2CLKdbn8dZanOb84ZZc4TKI1GbfHAQ== X-Received: by 2002:a17:903:25d6:b0:16b:f5cd:2cc3 with SMTP id jc22-20020a17090325d600b0016bf5cd2cc3mr14214425plb.74.1657213719848; Thu, 07 Jul 2022 10:08:39 -0700 (PDT) Received: from google.com (123.65.230.35.bc.googleusercontent.com. [35.230.65.123]) by smtp.gmail.com with ESMTPSA id r20-20020a170902be1400b0016b68cf6ae5sm23565302pls.226.2022.07.07.10.08.39 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 07 Jul 2022 10:08:39 -0700 (PDT) Date: Thu, 7 Jul 2022 17:08:35 +0000 From: Sean Christopherson To: Paolo Bonzini Cc: Marc Zyngier , Gavin Shan , Catalin Marinas , will@kernel.org, linux-kernel@vger.kernel.org, eauger@redhat.com, shan.gavin@gmail.com, Jonathan.Cameron@huawei.com, vkuznets@redhat.com, shijie@amperemail.onmicrosoft.com, kvmarm@lists.cs.columbia.edu, Peter Feiner Subject: Re: [PATCH v7 00/22] Support SDEI Virtualization Message-ID: References: <20220527080253.1562538-1-gshan@redhat.com> <6bdb9280-3530-dc1f-d33e-5bc1c5ac927b@redhat.com> <87iloq2oke.wl-maz@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Jul 05, 2022, Paolo Bonzini wrote: > That said: Peter, Sean, Google uses or used postcopy extensively on GCE > (https://dl.acm.org/doi/pdf/10.1145/3296975.3186415). If it doesn't use it > on x86, do you have any insights on why? We still use postcopy, but we don't use async #PF. Async #PF is disabled (mostly?) because the x86 implementation was such a mess prior to switching to IRQ-based delivery and AFAIK we haven't re-evaluated it since that update.