Hi, I am aware that Xen via libvirt is in the group C support for openstack but since I am not able to install xenserver iso at compute machines I have, I have to consider to use xen with libvirt (xcp-xapi is not available for ubuntu14.04). I have three nodes, each one running ubuntu 14.04. I follow the instruction to install juno in ubuntu 14.04 and it works (I can create instances from openstack GUI - horizon) when I use kvm as the hypervisor at the compute node . However, if I switch to use xen as the hypervisor by installing xen-hypervisor-amd64 or nova-compute-xen, it will fail to create instances. It complained "backend for qemu disk is not ready". I checked and did not find qemu process running in dom0. I could not find /etc/init.d/xencommons either. Then, I compiled and installed xen-4.4 from source code and I got xencommons in /etc/init.d. qemu process is running in dom0. However, the dom0 kernel crashes this time when I try to launch an instance from openstack GUI. I am able to create a xen guest with virt-install from command line, with the following command.
"$ virt-install --connect=xen:/// --name u14.04.3 --ram 1024 --disk u14.04.3.img,size=4,driver_name=qemu --location http://ftp.ubuntu.com/ubuntu/dists/trusty/main/installer-amd64/ --network bridge=virbr0" dmesg: [ 9443.130600] blkfront: xvda: flush diskcache: enabled; persistent grants: enabled; indirect descriptors: disabled; [ 9443.132818] xvda: xvda1 [ 9444.604489] xen:grant_table: WARNING: g.e. 0x30 still in use! [ 9444.604496] deferring g.e. 0x30 (pfn 0xffffffffffffffff) [ 9444.604499] xen:grant_table: WARNING: g.e. 0x31 still in use! [ 9444.604502] deferring g.e. 0x31 (pfn 0xffffffffffffffff) [ 9444.604505] xen:grant_table: WARNING: g.e. 0x32 still in use! [ 9444.604508] deferring g.e. 0x32 (pfn 0xffffffffffffffff) ==== lots of them==== [ 9444.604719] xen:grant_table: WARNING: g.e. 0xe still in use! [ 9444.604721] deferring g.e. 0xe (pfn 0xffffffffffffffff) [ 9444.604723] xen:grant_table: WARNING: g.e. 0xd still in use! [ 9444.604725] deferring g.e. 0xd (pfn 0xffffffffffffffff) [ 9448.325408] ------------[ cut here ]------------ [ 9448.325421] WARNING: CPU: 5 PID: 19902 at /build/buildd/linux-3.13.0/arch/x86/xen/multicalls.c:129 xen_mc_flush+0x 1a9/0x1b0() [ 9448.325492] CPU: 5 PID: 19902 Comm: sudo Tainted: GF O 3.13.0-33-generic #58-Ubuntu [ 9448.325494] Hardware name: Dell Inc. PowerEdge R710/00W9X3, BIOS 2.1.15 09/02/2010 [ 9448.325497] 0000000000000009 ffff8802d13d9aa8 ffffffff8171bd04 0000000000000000 [ 9448.325501] ffff8802d13d9ae0 ffffffff810676cd 0000000000000000 0000000000000001 [ 9448.325505] ffff88030418ffe0 ffff88031d6ab180 0000000000000010 ffff8802d13d9af0 [ 9448.325509] Call Trace: [ 9448.325518] [<ffffffff8171bd04>] dump_stack+0x45/0x56 [ 9448.325523] [<ffffffff810676cd>] warn_slowpath_common+0x7d/0xa0 [ 9448.325526] [<ffffffff810677aa>] warn_slowpath_null+0x1a/0x20 [ 9448.325530] [<ffffffff81004e99>] xen_mc_flush+0x1a9/0x1b0 [ 9448.325534] [<ffffffff81006b99>] xen_set_pud_hyper+0x109/0x110 [ 9448.325538] [<ffffffff81006c3b>] xen_set_pud+0x9b/0xb0 [ 9448.325543] [<ffffffff81177f06>] __pmd_alloc+0xd6/0x110 [ 9448.325548] [<ffffffff81182218>] move_page_tables+0x678/0x720 [ 9448.325552] [<ffffffff8117ddb7>] ? vma_adjust+0x337/0x7d0 [ 9448.325557] [<ffffffff811c23fd>] shift_arg_pages+0xbd/0x1b0 [ 9448.325560] [<ffffffff81181671>] ? mprotect_fixup+0x151/0x290 [ 9448.325564] [<ffffffff811c26cb>] setup_arg_pages+0x1db/0x200 [ 9448.325570] [<ffffffff81213edc>] load_elf_binary+0x41c/0xd80 [ 9448.325576] [<ffffffff8131d503>] ? ima_get_action+0x23/0x30 [ 9448.325579] [<ffffffff8131c7e2>] ? process_measurement+0x82/0x2c0 [ 9448.325584] [<ffffffff811c2f7f>] search_binary_handler+0x8f/0x1b0 [ 9448.325587] [<ffffffff811c44f7>] do_execve_common.isra.22+0x5a7/0x7e0 [ 9448.325591] [<ffffffff811c49c6>] SyS_execve+0x36/0x50 [ 9448.325596] [<ffffffff8172cc99>] stub_execve+0x69/0xa0 [ 9448.325599] ---[ end trace 53ac16782e751c0a ]--- [ 9448.347994] ------------[ cut here ]------------ [ 9448.348004] WARNING: CPU: 1 PID: 19902 at /build/buildd/linux-3.13.0/mm/mmap.c:2736 exit_mmap+0x16b/0x170() ==== more message ignored ==== I sent emails to the openstack mailing list and they gave me a few suggestions. At last, Bob Ball suggested I should probably ask this question on xen-devel mailing list. Any help will be highly appreciated! Thanks, Original discussion on openstack mailing list: http://www.gossamer-threads.com/lists/openstack/dev/42337 -Xing
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