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migration: fix spice migration
Commit 29ae8a4133082e16970c9d4be09f4b6a15034617 ("rdma: introduceMIG_STATE_NONE and change MIG_STATE_SETUP state transition") changed thestate transitions during migration setup.
Spice used to be notified with MIG_STATE_ACTIVE and it detected this...
rdma: account for the time spent in MIG_STATE_SETUP through QMP
Using the previous patches, we're now able to timestamp the SETUPstate. Once we have this time, let the user know about it in theschema.
Reviewed-by: Juan Quintela <quintela@redhat.com>Reviewed-by: Eric Blake <eblake@redhat.com>...
rdma: core logic
Code that does need to be visible is keptwell contained inside this file and this is the onlynew additional file to the entire patch.
This file includes the entire protocol and interfacesrequired to perform RDMA migration.
Also, the configure and Makefile modifications to link...
rdma: introduce ram_handle_compressed()
This gives RDMA shared access to madvise() on the destination sidewhen an entire chunk is found to be zero.
Reviewed-by: Juan Quintela <quintela@redhat.com>Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>Reviewed-by: Chegu Vinod <chegu_vinod@hp.com>...
block-migration: efficiently encode zero blocks
this patch adds a efficient encoding for zero blocks byadding a new flag indicating a block is completely zero.
additionally bdrv_write_zeros() is used at the destinationto efficiently write these zeroes. depending on the implementation...
Add 'auto-converge' migration capability
The auto-converge migration capability allows the user to specify if theychoose live migration seqeunce to automatically detect and force convergence.
Signed-off-by: Chegu Vinod <chegu_vinod@hp.com>Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>...
rdma: export throughput w/ MigrationStats QMP
This exposes throughput (in megabits/sec) through QMP.
Reviewed-by: Juan Quintela <quintela@redhat.com>Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>Reviewed-by: Chegu Vinod <chegu_vinod@hp.com>Tested-by: Chegu Vinod <chegu_vinod@hp.com>...
rdma: new QEMUFileOps hooks
These are the prototypes and implementation of new hooks thatRDMA takes advantage of to perform dynamic page registration.
An optional hook is also introduced for a custom functionto be able to override the default save_page function....
rdma: introduce capability x-rdma-pin-all
This capability allows you to disable dynamic chunk registrationfor better throughput on high-performance links.
For example, using an 8GB RAM virtual machine with all 8GB of memory inactive use and the VM itself is completely idle using a 40 gbps infiniband link:...
rdma: introduce qemu_update_position()
RDMA writes happen asynchronously, and thus the performance accountingalso needs to be able to occur asynchronously. This allows anybodyto call into savevm.c to update both f->pos as well as into arch_init.cto update the acct_info structure with up-to-date values when...
migration: do not sent zero pages in bulk stage
during bulk stage of ram migration if a page is azero page do not send it at all.the memory at the destination reads as zero anyway.
even if there is an madvise with QEMU_MADV_DONTNEEDat the target upon receipt of a zero page I have observed...
migration: eliminate s->migration_file
The indirection is useless now. Backends can open s->file directly.
Reviewed-by: Orit Wasserman <owasserm@redhat.com>Reviewed-by: Juan Quintela <quintela@redhat.com>Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>...
migration: yay, buffering is gone
Buffering was needed because blocking writes could take a long timeand starve other threads seeking to grab the big QEMU mutex.
Now that all writes (except within _complete callbacks) are doneoutside the big QEMU mutex, we do not need buffering at all....
migration: use QEMUFile for migration channel lifetime
As a start, use QEMUFile to store the destination and close it.qemu_get_fd gets a file descriptor that will be used by the writecallbacks.
Reviewed-by: Orit Wasserman <owasserm@redhat.com>Reviewed-by: Juan Quintela <quintela@redhat.com>...
migration: use QEMUFile for writing outgoing migration data
Second, drop the file descriptor indirection, and write directly to theQEMUFile.
migration: simplify error handling
Always use qemu_file_get_error to detect errors, since that is howQEMUFile itself drops I/O after an error occurs. There is no needto propagate and check return values all the time.
Also remove the "complete" member, since we know that it is set (via...
migration: cleanup migration (including thread) in the iothread
Perform final cleanup in a bottom half, and add joining the thread tothe series of cleanup actions.
migrate_fd_error remains for connection error, but it doesn't needto cleanup anything anymore....
migration: calculate expected_downtime
We removed the calculation in commit e4ed1541ac9413eac494a03532e34beaf8a7d1c5
Now we add it back. We need to create dirty_bytes_rate because wecan't include cpu-all.h from migration.c, and there is no other way to...
migration: move beginning stage to the migration thread
Signed-off-by: Juan Quintela <quintela@redhat.com>
Reviewed-by: Reviewed-by: Eric Blake <eblake@redhat.com>Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
migration: make function static
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>Signed-off-by: Juan Quintela <quintela@redhat.com>
Reviewed-by: Reviewed-by: Eric Blake <eblake@redhat.com>
migration: merge QEMUFileBuffered into MigrationState
Avoid splitting the state of outgoing migration, more or less arbitrarily,between two data structures. QEMUFileBuffered anyway is used only duringmigration.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>...
migration: move migration_fd_put_ready()
Put it near its use and un-export it.
migration: Inline qemu_fopen_ops_buffered into migrate_fd_connect
migration: move buffered_file.c code into migration.c
This only moves the code (also from buffered_file.h to migration.h).Fix whitespace until checkpatch is happy.
migration: make qemu_fopen_ops_buffered() return void
We want the file assignment to happen before the thread is created toavoid locking, so we just do it before creating the thread.
Reviewed-by: Orit Wasserman <owasserm@redhat.com>
migration: move migration thread init code to migrate_fd_put_ready
This way everything related with migration is run on the migrationthread and no locking is needed.
migration: remove unfreeze logic
Now that we have a thread, and blocking writes, we don't need it.
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
savevm: New save live migration method: pending
Code just now does (simplified for clarity)
if (qemu_savevm_state_iterate(s->file) == 1) { vm_stop_force_state(RUN_STATE_FINISH_MIGRATE); qemu_savevm_state_complete(s->file); }
Problem here is that qemu_savevm_state_iterate() returns 1 when it...
misc: move include files to include/qemu/
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
migration: move include files to include/migration/