|
From: | Tony Krowiak |
Subject: | [Qemu-devel] [qemu devel] disable shared memory is not available with this QEMU binary |
Date: | Tue, 31 Mar 2015 10:21:41 -0400 |
User-agent: | Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.5.0 |
Commit 49d2e648e8087d154d8bf8b91f27c8e05e79d5a6
removed the QemuOptDesc elements from the desc field of the qemu_machine_opts array defined in vl.c. Since applying that patch to qemu on my system, I can not start a guest from libvirt when certain machine options are configured for the guest domain. For example, if I configure the following for my guest domain: <memoryBacking> ... <nosharepages> ... </memoryBacking> I get the following libvirt error when I try to start the guest: error: unsupported configuration: disable shared memory is not available with this QEMU binary The nosharepages element generates the -machine option mem-merge=off on the QEMU command line. The error is thrown by libvirt because the QMP query-command-line-options command does not return mem-merge in the machine options parameter list. In fact, if I issue the query-command-line-options command via virsh as follows: virsh qemu-monitor-command guest_c2aa '{ "execute": "query-command-line-options", "arguments": { "option": "machine" } }' No machine option parameters are returned: {"return":[{"parameters":[],"option":"machine"}],"id":"libvirt-11"} I took a look at the qmp_query_command_line_options function in util/qemu-config.c. The function derives the option parameters to return with the the query response from the QemuOptDesc elements contained in the desc field of the qemu_machine_opts array defined in vl.c. It appears that removing the QemuOptDesc elements broke the qmp_query_command_line_options function. If I restore the QemuOptDesc elements removed by commit 49d2e648e8087d154d8bf8b91f27c8e05e79d5a6, I can start the guest with nosharepages configured. It would appear that a bug was introduced with commit 49d2e648e8087d154d8bf8b91f27c8e05e79d5a6, what say you? |
[Prev in Thread] | Current Thread | [Next in Thread] |