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=-5.3 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,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 0E90DC4363D for ; Wed, 7 Oct 2020 00:04:29 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C22682054F for ; Wed, 7 Oct 2020 00:04:28 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726752AbgJGAE1 (ORCPT ); Tue, 6 Oct 2020 20:04:27 -0400 Received: from mga11.intel.com ([192.55.52.93]:4470 "EHLO mga11.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725925AbgJGAE1 (ORCPT ); Tue, 6 Oct 2020 20:04:27 -0400 IronPort-SDR: eTCcfybZeErdyzzx74hol+yEXs0/oKJOvzWyv9+Jo4nzgvT0d9vgvAXpEdWytoE57ttzWpwd3a pL8rjc/+MIqA== X-IronPort-AV: E=McAfee;i="6000,8403,9766"; a="161364552" X-IronPort-AV: E=Sophos;i="5.77,344,1596524400"; d="scan'208";a="161364552" X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga001.fm.intel.com ([10.253.24.23]) by fmsmga102.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 06 Oct 2020 17:04:26 -0700 IronPort-SDR: KmB5ByB6QIQHPVZGEN9baEpIgMmRsc5mNFre9CmO3c7LXzyQTKxygNnRE4nbJL7+TOs0tfCaYp GZdWiqfeolGA== X-IronPort-AV: E=Sophos;i="5.77,344,1596524400"; d="scan'208";a="418472064" Received: from sjchrist-coffee.jf.intel.com (HELO linux.intel.com) ([10.54.74.160]) by fmsmga001-auth.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 06 Oct 2020 17:04:26 -0700 Date: Tue, 6 Oct 2020 17:04:24 -0700 From: Sean Christopherson To: Vivek Goyal Cc: Vitaly Kuznetsov , kvm@vger.kernel.org, linux-kernel@vger.kernel.org, virtio-fs-list , pbonzini@redhat.com Subject: Re: [PATCH v4] kvm,x86: Exit to user space in case page fault error Message-ID: <20201007000424.GD28981@linux.intel.com> References: <20201006134629.GB5306@redhat.com> <877ds38n6r.fsf@vitty.brq.redhat.com> <20201006141501.GC5306@redhat.com> <874kn78l2z.fsf@vitty.brq.redhat.com> <20201006150817.GD5306@redhat.com> <871rib8ji1.fsf@vitty.brq.redhat.com> <20201006161200.GB17610@linux.intel.com> <87y2kj71gj.fsf@vitty.brq.redhat.com> <20201006171704.GC17610@linux.intel.com> <20201006173527.GG5306@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20201006173527.GG5306@redhat.com> User-Agent: Mutt/1.5.24 (2015-08-30) Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Oct 06, 2020 at 01:35:27PM -0400, Vivek Goyal wrote: > On Tue, Oct 06, 2020 at 10:17:04AM -0700, Sean Christopherson wrote: > > [..] > > > > Note, TDX doesn't allow injection exceptions, so reflecting a #PF back > > > > into the guest is not an option. > > > > > > Not even #MC? So sad :-) > > > > Heh, #MC isn't allowed either, yet... > > If #MC is not allowd, logic related to hwpoison memory will not work > as that seems to inject #MC. Yep. Piggybacking #MC is undesirable for other reasons, e.g. adds a "hardware" dependency for what is really a paravirt feature.