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Description of problem:
When VIR_MIGRATE_RDMA_PIN_ALL flag is used to enable rdma-pin-all migration capability in QEMU and migration fails, there's no way to turn rdma-pin-all off and retry without it (even calling a migration API without VIR_MIGRATE_RDMA_PIN_ALL flag does not help).
Version-Release number of selected component (if applicable):
libvirt-1.2.8-6.el7
How reproducible:
100%
Steps to Reproduce:
1. misconfigure domain to be unusable with rdma-pin-all:
<memory unit='KiB'>1048576</memory>
<memtune>
<hard_limit unit='KiB'>1048576</hard_limit>
<swap_hard_limit unit='KiB'>1048576</swap_hard_limit>
</memtune>
2. virsh migrate --live --rdma-pin-all --migrateuri rdma://... $DOM
3. virsh migrate --live --migrateuri rdma://... $DOM
Actual results:
Step 2 fails immediately and QEMU log on destination host shows something like the following:
source_resolve_host RDMA Device opened: kernel name mlx4_0 uverbs device name
uverbs0, infiniband_verbs class device path
/sys/class/infiniband_verbs/uverbs0, infiniband class device path
/sys/class/infiniband/mlx4_0, transport: (2) Ethernet
Failed to register local dest ram block!
: Cannot allocate memory
RDMA ERROR: receiving remote info!
Step 3 fails in exactly the same way and
virsh qemu-monitor-command $DOM '{"execute":"query-migrate-capabilities"}'
shows rdma-pin-all is still enabled.
Expected results:
Step 3 should either succeed or fail later and if it fails, query-migrate-capabilities should report rdma-pin-all as disabled.
Additional info:
Fixed upstream by v1.2.10-103-gab39338:
commit ab393383c84eb049fc2d75c3e79249ca58062887
Author: Jiri Denemark <jdenemar>
Date: Mon Nov 10 14:46:26 2014 +0100
qemu: Always set migration capabilities
We used to set migration capabilities only when a user asked for them in
flags. This is fine when migration succeeds since the QEMU process is
killed in the end but in case migration fails or if it's cancelled, some
capabilities may remain turned on with no way to turn them off. To fix
that, migration capabilities have to be turned on if requested but
explicitly turned off in case they were not requested but QEMU supports
them.
https://bugzilla.redhat.com/show_bug.cgi?id=1163953
Signed-off-by: Jiri Denemark <jdenemar>
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory, and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.
https://rhn.redhat.com/errata/RHSA-2015-0323.html
Description of problem: When VIR_MIGRATE_RDMA_PIN_ALL flag is used to enable rdma-pin-all migration capability in QEMU and migration fails, there's no way to turn rdma-pin-all off and retry without it (even calling a migration API without VIR_MIGRATE_RDMA_PIN_ALL flag does not help). Version-Release number of selected component (if applicable): libvirt-1.2.8-6.el7 How reproducible: 100% Steps to Reproduce: 1. misconfigure domain to be unusable with rdma-pin-all: <memory unit='KiB'>1048576</memory> <memtune> <hard_limit unit='KiB'>1048576</hard_limit> <swap_hard_limit unit='KiB'>1048576</swap_hard_limit> </memtune> 2. virsh migrate --live --rdma-pin-all --migrateuri rdma://... $DOM 3. virsh migrate --live --migrateuri rdma://... $DOM Actual results: Step 2 fails immediately and QEMU log on destination host shows something like the following: source_resolve_host RDMA Device opened: kernel name mlx4_0 uverbs device name uverbs0, infiniband_verbs class device path /sys/class/infiniband_verbs/uverbs0, infiniband class device path /sys/class/infiniband/mlx4_0, transport: (2) Ethernet Failed to register local dest ram block! : Cannot allocate memory RDMA ERROR: receiving remote info! Step 3 fails in exactly the same way and virsh qemu-monitor-command $DOM '{"execute":"query-migrate-capabilities"}' shows rdma-pin-all is still enabled. Expected results: Step 3 should either succeed or fail later and if it fails, query-migrate-capabilities should report rdma-pin-all as disabled. Additional info: