From patchwork Mon Sep 14 12:37:18 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jan Beulich X-Patchwork-Id: 11773665 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 3762B59D for ; Mon, 14 Sep 2020 12:38:12 +0000 (UTC) Received: from lists.xenproject.org (lists.xenproject.org [192.237.175.120]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 06E9220759 for ; Mon, 14 Sep 2020 12:38:11 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 06E9220759 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=suse.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=xen-devel-bounces@lists.xenproject.org Received: from localhost ([127.0.0.1] helo=lists.xenproject.org) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1kHnjW-0001X7-Bs; Mon, 14 Sep 2020 12:37:22 +0000 Received: from us1-rack-iad1.inumbo.com ([172.99.69.81]) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1kHnjV-0001X2-GY for xen-devel@lists.xenproject.org; Mon, 14 Sep 2020 12:37:21 +0000 X-Inumbo-ID: f704f0a4-ea70-49a1-b915-aa760b96f405 Received: from mx2.suse.de (unknown [195.135.220.15]) by us1-rack-iad1.inumbo.com (Halon) with ESMTPS id f704f0a4-ea70-49a1-b915-aa760b96f405; Mon, 14 Sep 2020 12:37:20 +0000 (UTC) X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.221.27]) by mx2.suse.de (Postfix) with ESMTP id 58736AF59; Mon, 14 Sep 2020 12:37:35 +0000 (UTC) To: "xen-devel@lists.xenproject.org" Cc: Andrew Cooper , Wei Liu , =?utf-8?q?Roger_Pau_Monn=C3=A9?= , George Dunlap From: Jan Beulich Subject: [PATCH 0/3] x86: shim building adjustments Message-ID: <5d86a23c-5dea-8697-9ba1-900d35b99695@suse.com> Date: Mon, 14 Sep 2020 14:37:18 +0200 User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:68.0) Gecko/20100101 Thunderbird/68.12.0 MIME-Version: 1.0 Content-Language: en-US X-BeenThere: xen-devel@lists.xenproject.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Errors-To: xen-devel-bounces@lists.xenproject.org Sender: "Xen-devel" The first change is simply addressing a build issue noticed by Andrew. The build breakage goes beyond this specific combination though - PV_SHIM_EXCLUSIVE plus HVM is similarly an issue. This is what the last patch tries to take care of, in a shape already on irc noticed to be controversial. I'm submitting the change nevertheless because for the moment there looks to be a majority in favor of going this route. One argument not voiced there yet: What good does it do to allow a user to enable HVM when then on the resulting hypervisor they still can't run HVM guests (for the hypervisor still being a dedicated PV shim one). On top of this, the alternative approach is likely going to get ugly. 1: fix build with PV_SHIM_EXCLUSIVE and SHADOW_PAGING 2: adjust Kconfig defaults 3: don't permit HVM and PV_SHIM_EXCLUSIVE at the same time Jan