From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932165AbcGDHoq (ORCPT ); Mon, 4 Jul 2016 03:44:46 -0400 Received: from mga02.intel.com ([134.134.136.20]:28246 "EHLO mga02.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752759AbcGDHoo (ORCPT ); Mon, 4 Jul 2016 03:44:44 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.26,573,1459839600"; d="scan'208";a="729261973" Subject: Re: [PATCH 0/2] KVM: MMU: support VMAs that got remap_pfn_range-ed To: Paolo Bonzini , linux-kernel@vger.kernel.org, kvm@vger.kernel.org References: <1467291711-3230-1-git-send-email-pbonzini@redhat.com> <577A049A.4000402@linux.intel.com> Cc: Kirti Wankhede , Neo Jia , Andrea Arcangeli , =?UTF-8?B?UmFkaW0gS3LEjW3DocWZ?= From: Xiao Guangrong Message-ID: <577A130A.6090504@linux.intel.com> Date: Mon, 4 Jul 2016 15:40:58 +0800 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.8.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 07/04/2016 03:38 PM, Paolo Bonzini wrote: > > > On 04/07/2016 08:39, Xiao Guangrong wrote: >> Why the memory mapped by this mmap() is not a portion of MMIO from >> underlayer physical device? If it is a valid system memory, is this >> interface >> really needed to implemented in vfio? (you at least need to set VM_MIXEDMAP >> if it mixed system memory with MMIO) > > The KVM code does not care if VM_MIXEDMAP is set or not, it works in > either case. Yes, it is. I mean nvdia's vfio patchset should use VM_MIXEDMAP if the memory is mixed. :)