On 03/18/2013 09:18 PM, Jiri Denemark wrote:

Commit 82d5fe543720da6d83c1d6bfa1c347d7d9fda278

qemu: check backing chains even when cgroup is omitted

added backing file checks just before the code that removes optional disks if they are not present. However, the backing chain code fails in case the disk file does not exist, which makes qemuProcessStart fail regardless on configured startupPolicy.

Note that startupPolicy implementation is still wrong after this patch since it only check the first file in a possible chain. It should rather check the complete backing chain. But this is an existing limitation that can be solved later. After all, startupPolicy is most useful for CDROM images and they won't make use of backing files in most cases. --- src/qemu/qemu_process.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/src/qemu/qemu_process.c b/src/qemu/qemu_process.c index 1941d4e..3d2b7d6 100644 --- a/src/qemu/qemu_process.c +++ b/src/qemu/qemu_process.c @@ -3621,14 +3621,15 @@ int qemuProcessStart(virConnectPtr conn, goto cleanup;

VIR_DEBUG("Checking for CDROM and floppy presence"); + if (qemuDomainCheckDiskPresence(driver, vm, + flags & VIR_QEMU_PROCESS_START_COLD) < 0) + goto cleanup; + for (i = 0; i < vm->def->ndisks ; i++) { if (qemuDomainDetermineDiskChain(driver, vm->def->disks[i], false) < 0) goto cleanup; } - if (qemuDomainCheckDiskPresence(driver, vm, - flags & VIR_QEMU_PROCESS_START_COLD) < 0) - goto cleanup;

/* Get the advisory nodeset from numad if 'placement' of * either <vcpu> or <numatune> is 'auto'.

This fix is also in my patch set, so I give ACK. https://www.redhat.com/archives/libvir-list/2013-March/msg00990.html Guannan