From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:38766) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1VWDOU-0000BP-08 for qemu-devel@nongnu.org; Tue, 15 Oct 2013 18:47:22 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1VWDOJ-0004eB-Qa for qemu-devel@nongnu.org; Tue, 15 Oct 2013 18:47:13 -0400 Received: from mail-qc0-x22e.google.com ([2607:f8b0:400d:c01::22e]:33188) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1VWDOJ-0004dv-M1 for qemu-devel@nongnu.org; Tue, 15 Oct 2013 18:47:03 -0400 Received: by mail-qc0-f174.google.com with SMTP id v1so3478997qcw.19 for ; Tue, 15 Oct 2013 15:47:02 -0700 (PDT) Sender: Richard Henderson Message-ID: <525DC5E1.3090308@twiddle.net> Date: Tue, 15 Oct 2013 15:46:57 -0700 From: Richard Henderson MIME-Version: 1.0 References: <1380713622-22325-1-git-send-email-mimu@linux.vnet.ibm.com> <1380713622-22325-5-git-send-email-mimu@linux.vnet.ibm.com> <524D84CE.1000601@twiddle.net> <20131007124753.76c5ec84@bee> In-Reply-To: <20131007124753.76c5ec84@bee> Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Subject: Re: [Qemu-devel] [PATCH RFC 04/11] s390/qemu: cpu model cpu facilitiy support List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Michael Mueller Cc: qemu-devel@nongnu.org On 10/07/2013 03:47 AM, Michael Mueller wrote: > A second reason for using 2k of memory here is to fully represent the facilities as defined > in the s390x architecture. The SIE state needs it and I want to represent it identically in user > space and KVM. Otherwise I would need a specific interface just for the facilities. If KVM needs the data in the format that you've got it in now, that's fair enough. Otherwise, 128 bits per s390 system seems nicer than 32 bits per facility. r~