From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:34447) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1dITtr-0006BV-Bv for qemu-devel@nongnu.org; Wed, 07 Jun 2017 01:53:00 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1dITto-0006AA-A2 for qemu-devel@nongnu.org; Wed, 07 Jun 2017 01:52:59 -0400 Received: from mx1.redhat.com ([209.132.183.28]:35800) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1dITto-00069x-48 for qemu-devel@nongnu.org; Wed, 07 Jun 2017 01:52:56 -0400 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.12]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id CDB27368E5 for ; Wed, 7 Jun 2017 05:52:54 +0000 (UTC) Message-ID: <1496814770.5126.1.camel@redhat.com> From: Gerd Hoffmann Date: Wed, 07 Jun 2017 07:52:50 +0200 In-Reply-To: <20170530212614.18343-1-lersek@redhat.com> References: <20170530212614.18343-1-lersek@redhat.com> Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable Mime-Version: 1.0 Subject: Re: [Qemu-devel] [RFC] q35/mch: implement extended TSEG sizes List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Laszlo Ersek , qemu devel list Cc: "Michael S. Tsirkin" , Paolo Bonzini Hi, Patch looks sane overall. > Invent a new, QEMU-specific register in the config space of the DRAM > Controller, at offset 0x50, in order to allow guest firmware to query > the > TSEG (SMRAM) size. Hmm, 0x50 appears to be the only unused config space register in the specs. I suspect in reality it isn't unused but undocumented. I don't have a better idea though, and in practice it probably isn't much of a problem. cheers, Gerd