From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:59069) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1UjYTO-0004ry-Df for qemu-devel@nongnu.org; Mon, 03 Jun 2013 13:23:13 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1UjYTK-0007Bf-Al for qemu-devel@nongnu.org; Mon, 03 Jun 2013 13:23:10 -0400 Received: from mail-bk0-x230.google.com ([2a00:1450:4008:c01::230]:55200) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1UjYTK-0007BZ-28 for qemu-devel@nongnu.org; Mon, 03 Jun 2013 13:23:06 -0400 Received: by mail-bk0-f48.google.com with SMTP id jf20so2114026bkc.35 for ; Mon, 03 Jun 2013 10:23:05 -0700 (PDT) From: Peter Wu Date: Mon, 03 Jun 2013 19:23:01 +0200 Message-ID: <11353237.fLVsHzmD7c@al> MIME-Version: 1.0 Content-Transfer-Encoding: 7Bit Content-Type: text/plain; charset="us-ascii" Subject: [Qemu-devel] QEMU aborts since "kvm: support using KVM_MEM_READONLY flag for regions" List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: Jordan Justen , qemu-devel@nongnu.org Cc: Paolo Bonzini , Anthony Liguori , Xiao Guangrong Hi, With the current git source (f10acc8b38d65a66ffa0588a036489d7fa6a593e), `qemu-system-x86_64 -enable-kvm` fails to run with the following error: kvm_set_phys_mem: error unregistering overlapping slot: Invalid argument After this message, qemu aborts. Reverting the following commit on top of master makes the bug go away. Removing the `-enable-kvm` option also allows QEMU to operate, but without KVM. commit 235e8982ad393e5611cb892df54881c872eea9e1 Author: Jordan Justen Date: Wed May 29 01:27:26 2013 -0700 kvm: support using KVM_MEM_READONLY flag for regions For readonly memory regions and rom devices in romd_mode, we make use of the KVM_MEM_READONLY. A slot that uses KVM_MEM_READONLY can be read from and code can execute from the region, but writes will exit to qemu. For rom devices with !romd_mode, we force the slot to be removed so reads or writes to the region will exit to qemu. (Note that a memory region in this state is not executable within kvm.) QEMU was built using GCC 4.8.0, runs on Arch Linux 64-bit with a custom kernel, Linux 3.9.1. CPU: i5-460M. A backtrace is provided on the bottom of this message. If you need more details, please ask. Regards, Peter #0 0x00007ffff1a251c9 in raise () from /usr/lib/libc.so.6 #1 0x00007ffff1a265c8 in abort () from /usr/lib/libc.so.6 #2 0x00005555557dd84d in kvm_set_phys_mem (section=0x7fffe6fdca00, add=false) at /tmp/qemu/kvm-all.c:715 #3 0x00005555557e132c in address_space_update_topology_pass (as=as@entry=0x5555564dae00 , adding=adding@entry=false, old_view=..., new_view=...) at /tmp/qemu/memory.c:725 #4 0x00005555557e1f13 in address_space_update_topology (as=0x5555564dae00 ) at /tmp/qemu/memory.c:761 #5 memory_region_transaction_commit () at /tmp/qemu/memory.c:786 #6 0x00005555557dfa42 in access_with_adjusted_size (addr=addr@entry=2, value=value@entry=0x7fffe6fdcc18, size=1, access_size_min=, access_size_max=, access=access@entry=0x5555557e0000 , opaque=opaque@entry=0x55555658c238) at /tmp/qemu/memory.c:399 #7 0x00005555557e0f77 in memory_region_iorange_write (iorange=, offset=2, width=1, data=51) at /tmp/qemu/memory.c:475 #8 0x00005555557de562 in kvm_handle_io (count=1, size=1, direction=1, data=, port=3326) at /tmp/qemu/kvm-all.c:1507 #9 kvm_cpu_exec (env=env@entry=0x55555656f750) at /tmp/qemu/kvm-all.c:1659 #10 0x000055555578da05 in qemu_kvm_cpu_thread_fn (arg=0x55555656f750) at /tmp/qemu/cpus.c:759 #11 0x00007ffff6280dd2 in start_thread () from /usr/lib/libpthread.so.0 #12 0x00007ffff1ad5cdd in clone () from /usr/lib/libc.so.6