From patchwork Wed Sep 16 13:04:06 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jan Beulich X-Patchwork-Id: 11779723 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 9CB21618 for ; Wed, 16 Sep 2020 13:05:45 +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 541C6221EB for ; Wed, 16 Sep 2020 13:05:45 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="key not found in DNS" (0-bit key) header.d=suse.com header.i=@suse.com header.b="LaV3rRSc" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 541C6221EB 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 1kIX6X-00036L-9W; Wed, 16 Sep 2020 13:04:09 +0000 Received: from us1-rack-iad1.inumbo.com ([172.99.69.81]) by lists.xenproject.org with esmtp (Exim 4.92) (envelope-from ) id 1kIX6V-00036G-KO for xen-devel@lists.xenproject.org; Wed, 16 Sep 2020 13:04:07 +0000 X-Inumbo-ID: 4b88a622-60b3-4302-826e-5288822f95a9 Received: from mx2.suse.de (unknown [195.135.220.15]) by us1-rack-iad1.inumbo.com (Halon) with ESMTPS id 4b88a622-60b3-4302-826e-5288822f95a9; Wed, 16 Sep 2020 13:04:06 +0000 (UTC) X-Virus-Scanned: by amavisd-new at test-mx.suse.de DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.com; s=cantorsusede; t=1600261446; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding; bh=rsYpQPr9XZ2jsAls9iWzS/yvMAnNrHqzeM6AwMfqFUY=; b=LaV3rRSch1qb8QH6vhsBcOKQzHPXTX3Zi2KWLaXIEn0IvLYWUc2cuGGE1bMxGjCYubEraz JcrWKTbfB5b1LLyqo8q/uF3yPM9s8zRzoPIvNW7+j6FRnMrBr3rHLKPzq2D/zwaJYRITsG KHj5Aw+nX7OC6bbw3cI8n7erjXKeI+Ela/SQDMsJnpCr4Ybt0YuOZSX/wf2jo426e6VvPa dHPAHZq3Z0cyUH2d3HDY1f6KfhC2uOn64pqAcaM5fHL5xIKc73ISWAXBzy5lsmARAYy7pQ 9woA3dmlHYPDxRJ4liqeitrdTlUgX0S7kUO5c8wNmkM12yoWVsHo4ws+JazBDA== Received: from relay2.suse.de (unknown [195.135.221.27]) by mx2.suse.de (Postfix) with ESMTP id 3E01CB2A3; Wed, 16 Sep 2020 13:04:21 +0000 (UTC) From: Jan Beulich Subject: [PATCH v2 0/4] x86: shim building adjustments (plus shadow follow-on) To: "xen-devel@lists.xenproject.org" Cc: Andrew Cooper , Wei Liu , =?utf-8?q?Roger_Pau_Monn=C3=A9?= , George Dunlap Message-ID: Date: Wed, 16 Sep 2020 15:04:06 +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 4: refactor shadow_vram_{get,put}_l1e() Jan