[PATCH V3 00/19] qemu: support mapped-ram+directio+mulitfd

V3 series adding support for QEMU's mapped-ram stream format [1] and migration capability. The use of mapped-ram is controlled by extending save_image_format setting in qemu.conf with a new 'sparse' option. The 'raw' format continues to be the default. Also included are patches that leverage mapped-ram to add support for parallel save/restore. In one of the previous threads on this topic we discussed per-VM control of save image format by adding a 'format' parameter to virDomainSaveParams. I can do that as a followup series if folks agree its useful. Changes in V3: * Drop patch adding qemuFDPassGetId * Drop now upstream patch decomposing qemuSaveImageOpen * Add patch to get an FDPass from fdset * If qemu is still running after save, remove fdset V1: https://lists.libvirt.org/archives/list/devel@lists.libvirt.org/message/M... V2: https://lists.libvirt.org/archives/list/devel@lists.libvirt.org/message/G... [1] https://gitlab.com/qemu-project/qemu/-/blob/master/docs/devel/migration/m... Claudio Fontana (3): include: Define constants for parallel save/restore tools: add parallel parameter to virsh save command tools: add parallel parameter to virsh restore command Jim Fehlig (16): lib: virDomain{Save,Restore}Params: Ensure absolute path qemu: Add function to get FDPass object from monitor qemu: Add function to check capability in migration params qemu: Add function to get bool value from migration params qemu: Add mapped-ram migration capability qemu: Add function to get migration params for save qemu_saveimage: add "sparse" to supported save image formats qemu: Add helper function for creating save image fd qemu: Move declaration of virQEMUSaveFormat to header file qemu: Add support for mapped-ram on save qemu: Move creation of qemuProcessIncomingDef struct qemu: Apply migration parameters in qemuMigrationDstRun qemu: Add support for mapped-ram on restore qemu: Support O_DIRECT with mapped-ram on save qemu: Support O_DIRECT with mapped-ram on restore qemu: Add support for parallel save and restore docs/manpages/virsh.rst | 21 +++- include/libvirt/libvirt-domain.h | 11 ++ src/libvirt-domain.c | 95 +++++++++++--- src/qemu/qemu.conf.in | 9 +- src/qemu/qemu_driver.c | 78 +++++++++--- src/qemu/qemu_fd.c | 46 +++++++ src/qemu/qemu_fd.h | 4 + src/qemu/qemu_migration.c | 204 ++++++++++++++++++++++--------- src/qemu/qemu_migration.h | 10 +- src/qemu/qemu_migration_params.c | 92 ++++++++++++++ src/qemu/qemu_migration_params.h | 17 +++ src/qemu/qemu_monitor.c | 37 ++++++ src/qemu/qemu_monitor.h | 5 + src/qemu/qemu_process.c | 100 ++++++++++----- src/qemu/qemu_process.h | 19 ++- src/qemu/qemu_saveimage.c | 141 ++++++++++++--------- src/qemu/qemu_saveimage.h | 23 ++++ src/qemu/qemu_snapshot.c | 22 +++- tools/virsh-domain.c | 81 ++++++++++-- 19 files changed, 805 insertions(+), 210 deletions(-) -- 2.43.0