Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755346Ab2HUC5R (ORCPT ); Mon, 20 Aug 2012 22:57:17 -0400 Received: from e28smtp02.in.ibm.com ([122.248.162.2]:49416 "EHLO e28smtp02.in.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754898Ab2HUC5L (ORCPT ); Mon, 20 Aug 2012 22:57:11 -0400 Message-ID: <5032F8FD.2020306@linux.vnet.ibm.com> Date: Tue, 21 Aug 2012 10:57:01 +0800 From: Xiao Guangrong User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:14.0) Gecko/20120717 Thunderbird/14.0 MIME-Version: 1.0 To: Avi Kivity CC: Marcelo Tosatti , LKML , KVM Subject: [PATCH v6 00/12] KVM: introduce readonly memslot Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit x-cbid: 12082102-5816-0000-0000-000004146435 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1037 Lines: 23 Changelog: - fix endless retrying for unhandleable instruction which accesses on readonly host memory - divide slot->flags by 16:16, the lower part is visible for userspace, the reset is internally used in kvm, and document this in the code - check slot->flags for gfn_to_hva_memslot The test case can be found at: http://lkml.indiana.edu/hypermail/linux/kernel/1207.2/00819/migrate-perf.tar.bz2 In current code, if we map a readonly memory space from host to guest and the page is not currently mapped in the host, we will get a fault-pfn and async is not allowed, then the vm will crash. As Avi's suggestion, We introduce readonly memory region to map ROM/ROMD to the guest, read access is happy for readonly memslot, write access on readonly memslot will cause KVM_EXIT_MMIO exit. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/