From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([208.118.235.92]:53099) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1SFNvM-000322-Vk for qemu-devel@nongnu.org; Wed, 04 Apr 2012 06:58:54 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1SFNvG-000878-A9 for qemu-devel@nongnu.org; Wed, 04 Apr 2012 06:58:48 -0400 Received: from goliath.siemens.de ([192.35.17.28]:34720) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1SFNvG-00086m-0P for qemu-devel@nongnu.org; Wed, 04 Apr 2012 06:58:42 -0400 Message-ID: <4F7C295D.8090202@siemens.com> Date: Wed, 04 Apr 2012 12:58:37 +0200 From: Jan Kiszka MIME-Version: 1.0 References: <1333339457-13854-1-git-send-email-david@gibson.dropbear.id.au> <4F7AA1E0.2070201@web.de> <20120404011238.GC17423@truffala.fritz.box> In-Reply-To: <20120404011238.GC17423@truffala.fritz.box> Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Subject: Re: [Qemu-devel] [PATCH, RESEND] kvm: Fix dirty tracking with large kernel page size List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: mtosatti@redhat.com, aliguori@us.ibm.com, qemu-devel@nongnu.org, Avi Kivity On 2012-04-04 03:12, David Gibson wrote: >> Also, what's about coalesced MMIO? I see that the ring definition >> depends on [TARGET_]PAGE_SIZE. What page size does the power kernel use >> for it, and does it make a relevant difference for space? > > Hr, so the HV variant of Power KVM doesn't do coalesced mmio. The PR > variant does, but I don't know enough about it to easily answer that. > If there's a bug there, it hasn't bitten yet, so how about we fix that > another day. Not really a smart approach, specifically now that we are aware of a potential problem here. Jan -- Siemens AG, Corporate Technology, CT T DE IT 1 Corporate Competence Center Embedded Linux