[libvirt RFCv5 00/27] multifd save restore prototype
Claudio Fontana
cfontana at suse.de
Sat Apr 30 14:15:35 UTC 2022
This is the multifd save prototype in semi-functional state,
with both save and restore minimally functional.
There are still quite a few rough edges.
KNOWN ISSUES:
1) this applies only to virsh save and virsh restore for now
(no managed save etc).
2) error handling is not good yet, especially during resume,
errors may leave behind a qemu process and such.
May need some help find all of these cases
3) the compression part is demonstrative only, there needs
to be more attention to compression options, and detecting
the compression used to store the multifd saves.
...
changes from v4:
* runIO renamed to virFileDiskCopy and rethought arguments
* renamed new APIs from ...ParametersFlags to ...Params
* introduce the new virDomainSaveParams and virDomainRestoreParams
without any additional parameters, so they can be upstreamed first.
* solved the issue in the gendispatch.pl script generating code that
was missing the conn parameter.
---
changes from v3:
* reordered series to have all helper-related change at the start
* solved all reported issues from ninja test, including documentation
* fixed most broken migration capabilities code (still imperfect likely)
* added G_GNUC_UNUSED as needed
* after multifd restore, added what I think were the missing operations:
qemuProcessRefreshState(),
qemuProcessStartCPUs() - most importantly,
virDomainObjSave()
The domain now starts running after restore without further encouragement
* removed the sleep(10) from the multifd-helper
changes from v2:
* added ability to restore the VM from disk using multifd
* fixed the multifd-helper to work in both directions,
assuming the need to listen for save, and connect for restore.
* fixed a large number of bugs, and probably introduced some :-)
Thanks for your thoughts,
Claudio
Claudio Fontana (27):
iohelper: introduce new struct to carry copy operation parameters
iohelper: refactor copy operation as a separate function
iohelper: move runIO function to virfile.c
virfile: rename runIO to virFileDiskCopy
virfile: change virFileDiskCopy arguments to extend beyond stdin,
stdout
virfile: add comment about the use of SEEK_END in virFileDiskCopy
multifd-helper: new helper for parallel save/restore
libvirt: introduce virDomainSaveParams public API
libvirt: introduce virDomainRestoreParams public API
remote: Add RPC support for the virDomainSaveParams API
gendispatch: add DomainRestoreParams as requiring conn argument
remote: Add RPC support for the virDomainRestoreParams API
qemu: add implementation for virDomainSaveParams API
qemu: add implementation for virDomainRestoreParams API
libvirt: add new VIR_DOMAIN_SAVE_PARALLEL flag and parameter
qemu: add stub support for VIR_DOMAIN_SAVE_PARALLEL in save
qemu: add stub support for VIR_DOMAIN_SAVE_PARALLEL in restore
qemu: saveimage: introduce virQEMUSaveFd
qemu: wire up saveimage code with the multifd helper
qemu: capabilities: add multifd to the probed migration capabilities
qemu: implement qemuMigrationSrcToFilesMultiFd
qemu: add parameter to qemuMigrationDstRun to skip waiting
qemu: implement qemuSaveImageLoadMultiFd
tools: add parallel parameter to virsh save command
tools: add parallel parameter to virsh restore command
docs: update refs to virDomainSaveParams and virDomainRestoreParams
qemu: add migration parameter multifd-compression
docs/formatsnapshot.rst | 5 +-
docs/manpages/virsh.rst | 34 +-
include/libvirt/libvirt-domain.h | 49 ++
po/POTFILES.in | 1 +
src/driver-hypervisor.h | 14 +
src/libvirt-domain.c | 99 +++-
src/libvirt_private.syms | 1 +
src/libvirt_public.syms | 6 +
src/qemu/qemu_capabilities.c | 6 +
src/qemu/qemu_capabilities.h | 4 +
src/qemu/qemu_driver.c | 239 +++++++--
src/qemu/qemu_migration.c | 155 ++++--
src/qemu/qemu_migration.h | 16 +-
src/qemu/qemu_migration_params.c | 71 ++-
src/qemu/qemu_migration_params.h | 15 +
src/qemu/qemu_process.c | 3 +-
src/qemu/qemu_process.h | 5 +-
src/qemu/qemu_saveimage.c | 496 ++++++++++++++----
src/qemu/qemu_saveimage.h | 49 +-
src/qemu/qemu_snapshot.c | 6 +-
src/remote/remote_driver.c | 2 +
src/remote/remote_protocol.x | 29 +-
src/remote_protocol-structs | 17 +
src/rpc/gendispatch.pl | 5 +-
src/util/iohelper.c | 162 +-----
src/util/meson.build | 19 +
src/util/multifd-helper.c | 249 +++++++++
src/util/virfile.c | 218 ++++++++
src/util/virfile.h | 2 +
src/util/virthread.c | 5 +
src/util/virthread.h | 1 +
.../caps_4.0.0.aarch64.xml | 1 +
.../qemucapabilitiesdata/caps_4.0.0.ppc64.xml | 1 +
.../caps_4.0.0.riscv32.xml | 1 +
.../caps_4.0.0.riscv64.xml | 1 +
.../qemucapabilitiesdata/caps_4.0.0.s390x.xml | 1 +
.../caps_4.0.0.x86_64.xml | 1 +
.../caps_4.1.0.x86_64.xml | 1 +
.../caps_4.2.0.aarch64.xml | 1 +
.../qemucapabilitiesdata/caps_4.2.0.ppc64.xml | 1 +
.../qemucapabilitiesdata/caps_4.2.0.s390x.xml | 1 +
.../caps_4.2.0.x86_64.xml | 1 +
.../caps_5.0.0.aarch64.xml | 2 +
.../qemucapabilitiesdata/caps_5.0.0.ppc64.xml | 2 +
.../caps_5.0.0.riscv64.xml | 2 +
.../caps_5.0.0.x86_64.xml | 2 +
.../qemucapabilitiesdata/caps_5.1.0.sparc.xml | 2 +
.../caps_5.1.0.x86_64.xml | 2 +
.../caps_5.2.0.aarch64.xml | 2 +
.../qemucapabilitiesdata/caps_5.2.0.ppc64.xml | 2 +
.../caps_5.2.0.riscv64.xml | 2 +
.../qemucapabilitiesdata/caps_5.2.0.s390x.xml | 2 +
.../caps_5.2.0.x86_64.xml | 2 +
.../caps_6.0.0.aarch64.xml | 2 +
.../qemucapabilitiesdata/caps_6.0.0.s390x.xml | 2 +
.../caps_6.0.0.x86_64.xml | 2 +
.../caps_6.1.0.x86_64.xml | 2 +
.../caps_6.2.0.aarch64.xml | 2 +
.../qemucapabilitiesdata/caps_6.2.0.ppc64.xml | 2 +
.../caps_6.2.0.x86_64.xml | 2 +
.../caps_7.0.0.aarch64.xml | 2 +
.../qemucapabilitiesdata/caps_7.0.0.ppc64.xml | 2 +
.../caps_7.0.0.x86_64.xml | 2 +
tools/virsh-domain.c | 96 +++-
64 files changed, 1686 insertions(+), 446 deletions(-)
create mode 100644 src/util/multifd-helper.c
--
2.34.1
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