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path: root/migration.c
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2014-03-09Add a 'name' parameter to qemu_thread_createDr. David Alan Gilbert
If enabled, set the thread name at creation (on GNU systems with pthread_set_np) Fix up all the callers with a thread name Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com> Acked-by: Michael S. Tsirkin <mst@redhat.com> Reviewed-by: Laszlo Ersek <lersek@redhat.com>
2014-02-25rdma: rename 'x-rdma' => 'rdma'Michael R. Hines
As far as we can tell, all known bugs have been fixed: 1. Parallel migrations are working 2. IPv6 migration is working 3. virt-test is working I'm not comfortable sending the revised libvirt patch until this is accepted or review suggestions are addressed, (including pin-all support. It does not make sense to remove experimental for one thing and not the other. That's too many trips through the libvirt community). Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Michael R. Hines <mrhines@us.ibm.com> Signed-off-by: Juan Quintela <quintela@redhat.com>
2014-02-04XBZRLE cache size should not be larger than guest memory sizeOrit Wasserman
Signed-off-by: Orit Wasserman <owasserm@redhat.com> Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com> Signed-off-by: Juan Quintela <quintela@redhat.com>
2014-02-04migration:fix free XBZRLE decoded_buf wrongGonglei (Arei)
When qemu do live migration with xbzrle, qemu malloc decoded_buf at destination end but free it at source end. It will crash qemu by double free error in some scenarios. Splitting the XBZRLE structure for clear logic distinguishing src/dst side. Signed-off-by: ChenLiang <chenliang88@huawei.com> Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Orit Wasserman <owasserm@redhat.com> Signed-off-by: GongLei <arei.gonglei@huawei.com> Signed-off-by: Juan Quintela <quintela@redhat.com>
2014-02-04Add check for cache size smaller than page sizeOrit Wasserman
Signed-off-by: Orit Wasserman <owasserm@redhat.com> Reviewed-by: Juan Quintela <quintela@redhat.com> Signed-off-by: Juan Quintela <quintela@redhat.com>
2014-01-14Merge remote branch 'luiz/queue/qmp' into qmpqEdgar E. Iglesias
* luiz/queue/qmp: migration: qmp_migrate(): keep working after syntax error qerror: Remove assert_no_error() qemu-option: Remove qemu_opts_create_nofail target-i386: Remove assert_no_error usage hw: Remove assert_no_error usages qdev: Delete dead code error: Add error_abort monitor: add object-add (QMP) and object_add (HMP) command monitor: add object-del (QMP) and object_del (HMP) command qom: catch errors in object_property_add_child qom: fix leak for objects created with -object rng: initialize file descriptor to -1 qemu-monitor: HMP cpu-add wrapper vl: add missing transition debug->finish_migrate Message-Id: 1389045795-18706-1-git-send-email-lcapitulino@redhat.com Signed-off-by: Edgar E. Iglesias <edgar.iglesias@xilinx.com>
2014-01-13migration: Fix rate limitMatthew Garrett
The migration thread appears to want to allow writeout to occur at full speed rather than being rate limited during completion of state saving, but sets the limit to INT_MAX when xfer_limit is INT64_MAX. This causes problems if there's more than 2GB of state left to save at this point. It probably ought to just be INT64_MAX instead. Signed-off-by: Matthew Garrett <matthew.garrett@nebula.com> Reviewed-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Juan Quintela <quintela@redhat.com>
2014-01-13introduce MIG_STATE_CANCELLING stateZhanghaoyu (A)
Introduce MIG_STATE_CANCELLING state to avoid starting a new migration task while the previous one still exist. Signed-off-by: Zeng Junliang <zengjunliang@huawei.com> Signed-off-by: Zhang Haoyu <haoyu.zhang@huawei.com> Reviewed-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Juan Quintela <quintela@redhat.com>
2014-01-13avoid a bogus COMPLETED->CANCELLED transitionZhanghaoyu (A)
Avoid a bogus COMPLETED->CANCELLED transition. There is a period of time from the timing of setting COMPLETED state to that of migration thread exits, so during which it's problematic in COMPLETED->CANCELLED transition. Signed-off-by: Zeng Junliang <zengjunliang@huawei.com> Signed-off-by: Zhang Haoyu <haoyu.zhang@huawei.com> Reviewed-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Juan Quintela <quintela@redhat.com>
2014-01-06migration: qmp_migrate(): keep working after syntax errorLuiz Capitulino
If a user or QMP client enter a bad syntax for the migrate command in QMP/HMP, then the migrate command will never succeed from that point on. For example, if you enter: (qemu) migrate tcp;0:4444 migrate: Parameter 'uri' expects a valid migration protocol Then the migrate command will always fail from now on: (qemu) migrate tcp:0:4444 migrate: There's a migration process in progress The problem is that qmp_migrate() sets the migration status to MIG_STATE_SETUP and doesn't reset it on syntax error. This bug was introduced by commit 29ae8a4133082e16970c9d4be09f4b6a15034617. Reviewed-by: Michael R. Hines <mrhines@us.ibm.com> Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
2013-10-05migration: Fix compiler warning ('caps' may be used uninitialized)Michael Tokarev
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru> Reviewed-by: Stefan Weil <sw@weilnetz.de>
2013-09-24migration: Fix debug print typeChristoffer Dall
The printf args are uint64_t and with -Werr QEMU doesn't compile with migration debugging turned on unless this is fixed. Fix it. Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org> Signed-off-by: Juan Quintela <quintela@redhat.com>
2013-08-22aio / timers: Switch entire codebase to the new timer APIAlex Bligh
This is an autogenerated patch using scripts/switch-timer-api. Switch the entire code base to using the new timer API. Note this patch may introduce some line length issues. Signed-off-by: Alex Bligh <alex@alex.org.uk> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2013-08-22aio / timers: Untangle include filesAlex Bligh
include/qemu/timer.h has no need to include main-loop.h and doing so causes an issue for the next patch. Unfortunately various files assume including timers.h will pull in main-loop.h. Untangle this mess. Signed-off-by: Alex Bligh <alex@alex.org.uk> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2013-08-01migration: don't use uninitialized variablesPawit Pornkitprasan
The qmp_migrate method uses the 'blk' and 'inc' parameter without checking if they're valid or not (they may be uninitialized if command is received via QMP) Signed-off-by: Pawit Pornkitprasan <p.pawit@gmail.com> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
2013-08-01migration: send total time in QMP at "completed" stagePawit Pornkitprasan
The "completed" stage sets total_time but not has_total_time and thus it is not sent via QMP reply (but sent via HMP nevertheless) Signed-off-by: Pawit Pornkitprasan <p.pawit@gmail.com> Reviewed-by: Eric Blake <eblake@redhat.com> Reviewed-by: Orit Wasserman <owasserm@redhat.com> Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
2013-07-29migration: fix spice migrationStefan Hajnoczi
Commit 29ae8a4133082e16970c9d4be09f4b6a15034617 ("rdma: introduce MIG_STATE_NONE and change MIG_STATE_SETUP state transition") changed the state transitions during migration setup. Spice used to be notified with MIG_STATE_ACTIVE and it detected this using migration_is_active(). Spice is now notified with MIG_STATE_SETUP and migration_is_active() no longer works. Replace migration_is_active() with migration_in_setup() to fix spice migration. Cc: Michael R. Hines <mrhines@us.ibm.com> Reviewed-by: Kevin Wolf <kwolf@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2013-07-29migration: notify migration state before starting threadStefan Hajnoczi
The migration thread runs outside the QEMU global mutex when possible. Therefore we must notify migration state change *before* starting the migration thread. This allows registered listeners to act before live migration iterations begin. Therefore they can get into a state that allows for live migration. When the migration thread starts everything will be ready. Without this patch there is a race condition during migration setup, depending on whether the migration thread has already transitioned from SETUP to ACTIVE state. Acked-by: Paolo Bonzini <pbonzini@redhat.com> Reviewed-by: Kevin Wolf <kwolf@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2013-07-23rdma: account for the time spent in MIG_STATE_SETUP through QMPMichael R. Hines
Using the previous patches, we're now able to timestamp the SETUP state. Once we have this time, let the user know about it in the schema. Reviewed-by: Juan Quintela <quintela@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Michael R. Hines <mrhines@us.ibm.com> Signed-off-by: Juan Quintela <quintela@redhat.com>
2013-07-23rdma: introduce MIG_STATE_NONE and change MIG_STATE_SETUP state transitionMichael R. Hines
As described in the previous patch, until now, the MIG_STATE_SETUP state was not really a 'formal' state. It has been used as a 'zero' state (what we're calling 'NONE' here) and QEMU has been unconditionally transitioning into this state when the QMP migration command was called. Instead we want to introduce MIG_STATE_NONE, which is our starting state in the state machine, and then immediately transition into the MIG_STATE_SETUP state when the QMP migrate command is issued. In order to do this, we must delay the transition into MIG_STATE_ACTIVE until later in the migration_thread(). This is done to be able to timestamp the amount of time spent in the SETUP state for proper accounting to the user during an RDMA migration. Furthermore, the management software, until now, has never been aware of the existence of the SETUP state whatsoever. This must change, because, timing of this state implies that the state actually exists. These two patches cannot be separated because the 'query_migrate' QMP switch statement needs to know how to handle this new state transition. Reviewed-by: Juan Quintela <quintela@redhat.com> Tested-by: Michael R. Hines <mrhines@us.ibm.com> Signed-off-by: Michael R. Hines <mrhines@us.ibm.com> Signed-off-by: Juan Quintela <quintela@redhat.com>
2013-07-23rdma: allow state transitions between other states besides ACTIVEMichael R. Hines
This patch is in preparation for the next ones: Until now the MIG_STATE_SETUP state was not really a 'formal' state. It has been used as a 'zero' state and QEMU has been unconditionally transitioning into this state when the QMP migrate command was called. In preparation for timing this state, we have to make this state a a 'real' state which actually gets transitioned from later in the migration_thread() from SETUP => ACTIVE, rather than just automatically dropping into this state at the beginninig of the migration. This means that the state transition function (migration_finish_set_state()) needs to be capable of transitioning from valid states _other_ than just MIG_STATE_ACTIVE. The function is in fact already capable of doing that, but was not allowing the old state to be a parameter specified as an input. This patch fixes that and only makes the transition if the current state matches the old state that the caller intended to transition from. Reviewed-by: Juan Quintela <quintela@redhat.com> Tested-by: Michael R. Hines <mrhines@us.ibm.com> Signed-off-by: Michael R. Hines <mrhines@us.ibm.com> Signed-off-by: Juan Quintela <quintela@redhat.com>
2013-07-23rdma: core logicMichael R. Hines
Code that does need to be visible is kept well contained inside this file and this is the only new additional file to the entire patch. This file includes the entire protocol and interfaces required to perform RDMA migration. Also, the configure and Makefile modifications to link this file are included. Full documentation is in docs/rdma.txt Reviewed-by: Paolo Bonzini <pbonzini@redhat.com> Reviewed-by: Chegu Vinod <chegu_vinod@hp.com> Tested-by: Chegu Vinod <chegu_vinod@hp.com> Tested-by: Michael R. Hines <mrhines@us.ibm.com> Signed-off-by: Michael R. Hines <mrhines@us.ibm.com> Signed-off-by: Juan Quintela <quintela@redhat.com>
2013-07-19block-migration: efficiently encode zero blocksPeter Lieven
this patch adds a efficient encoding for zero blocks by adding a new flag indicating a block is completely zero. additionally bdrv_write_zeros() is used at the destination to efficiently write these zeroes. depending on the implementation this avoids that the destination target gets fully provisioned. Signed-off-by: Peter Lieven <pl@kamp.de> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2013-07-15Merge remote-tracking branch 'quintela/migration.next' into stagingAnthony Liguori
# By Chegu Vinod # Via Juan Quintela * quintela/migration.next: Force auto-convegence of live migration Add 'auto-converge' migration capability Introduce async_run_on_cpu() Message-id: 1373664508-5404-1-git-send-email-quintela@redhat.com Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2013-07-15migration: Fail migration on bdrv_flush_all() errorKevin Wolf
If bdrv_flush_all() returns an error, there is an inconsistency in the view of an image file between the source and the destination host. Completing the migration would lead to corruption. Better abort migration in this case. To reproduce this case, try the following (ensures that there is something to flush, and then fails that flush): $ qemu-img create -f qcow2 test.qcow2 1G $ cat blkdebug.cfg [inject-error] event = "flush_to_os" errno = "5" $ qemu-system-x86_64 -hda blkdebug:blkdebug.cfg:test.qcow2 -monitor stdio (qemu) qemu-io ide0-hd0 "write 0 4k" (qemu) migrate ... Signed-off-by: Kevin Wolf <kwolf@redhat.com> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
2013-07-12Add 'auto-converge' migration capabilityChegu Vinod
The auto-converge migration capability allows the user to specify if they choose 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> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Juan Quintela <quintela@redhat.com>
2013-07-04add a header file for atomic operationsPaolo Bonzini
We're already using them in several places, but __sync builtins are just too ugly to type, and do not provide seqcst load/store operations. Reviewed-by: Richard Henderson <rth@twiddle.net> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2013-06-27rdma: introduce capability x-rdma-pin-allMichael R. Hines
This capability allows you to disable dynamic chunk registration for better throughput on high-performance links. For example, using an 8GB RAM virtual machine with all 8GB of memory in active use and the VM itself is completely idle using a 40 gbps infiniband link: 1. x-rdma-pin-all disabled total time: approximately 7.5 seconds @ 9.5 Gbps 2. x-rdma-pin-all enabled total time: approximately 4 seconds @ 26 Gbps These numbers would of course scale up to whatever size virtual machine you have to migrate using RDMA. Enabling this feature does *not* have any measurable affect on migration *downtime*. This is because, without this feature, all of the memory will have already been registered already in advance during the bulk round and does not need to be re-registered during the successive iteration rounds. Reviewed-by: Juan Quintela <quintela@redhat.com> Reviewed-by: Paolo Bonzini <pbonzini@redhat.com> Reviewed-by: Chegu Vinod <chegu_vinod@hp.com> Reviewed-by: Eric Blake <eblake@redhat.com> Tested-by: Chegu Vinod <chegu_vinod@hp.com> Tested-by: Michael R. Hines <mrhines@us.ibm.com> Signed-off-by: Michael R. Hines <mrhines@us.ibm.com> Signed-off-by: Juan Quintela <quintela@redhat.com>
2013-06-27rdma: export throughput w/ MigrationStats QMPMichael R. Hines
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> Tested-by: Michael R. Hines <mrhines@us.ibm.com> Signed-off-by: Michael R. Hines <mrhines@us.ibm.com> Signed-off-by: Juan Quintela <quintela@redhat.com>
2013-06-01migration: Remove duplicate bandwidth_limit setLei Li
bandwidth_limit is double set in migrate_init(), remove one. Signed-off-by: Lei Li <lilei@linux.vnet.ibm.com> Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
2013-05-17Revert "migration: don't account sleep time for calculating bandwidth"Michael Roth
This reverts commit 7161082c8d8cf167c508976887a0a63f4db92b51. Reverting this patch fixes a divide-by-zero error in qemu that can be fairly reliably triggered by doing block migration. In this case, the configuration/error was: source: temp/x86_64-softmmu/qemu-system-x86_64 -enable-kvm -L temp-bios -M pc-i440fx-1.4 -m 512M -kernel boot/vmlinuz-x86_64 -initrd boot/test-initramfs-x86_64.img.gz -vga std -append seed=1234 -drive file=disk1.img,if=virtio -drive file=disk2.img,if=virtio -device virtio-net-pci,netdev=net0 -netdev user,id=net0 -monitor unix:/tmp/vm-hmp.sock,server,nowait -qmp unix:/tmp/vm-qmp.sock,server,nowait -vnc :100 16837 Floating point exception(core dumped) target: temp/x86_64-softmmu/qemu-system-x86_64 -enable-kvm -L temp-bios -M pc-i440fx-1.4 -m 512M -kernel boot/vmlinuz-x86_64 -initrd boot/test-initramfs-x86_64.img.gz -vga std -append seed=1234 -drive file=target_disk1.img,if=virtio -drive file=target_disk2.img,if=virtio -device virtio-net-pci,netdev=net0 -netdev user,id=net0 -incoming unix:/tmp/migrate.sock -monitor unix:/tmp/vm-hmp-incoming.sock,server,nowait -qmp unix:/tmp/vm-qmp-incoming.sock,server,nowait -vnc :101 Receiving block device images 20 % 21 % load of migration failed This revert potentially re-introduces a bug that was present in 1.4, but fixes a prevalent issue with block migration so we should revert it for now and take an updated patch later. Conflicts: migration.c * fixed up to remove logic introduced in 7161082c while leaving changes in HEAD intact Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com> Message-id: 1368739544-31021-1-git-send-email-mdroth@linux.vnet.ibm.com Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2013-04-17migration: reflect incoming failure to shellEric Blake
Management apps like libvirt don't know to pay attention to stderr unless there is a non-zero exit status. * migration.c (process_incoming_migration_co): Exit with non-zero status on failure. Signed-off-by: Eric Blake <eblake@redhat.com> Message-id: 1366149041-626-1-git-send-email-eblake@redhat.com Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
2013-04-02oslib-posix: rename socket_set_nonblock() to qemu_set_nonblock()Stefan Hajnoczi
The fcntl(fd, F_SETFL, O_NONBLOCK) flag is not specific to sockets. Rename to qemu_set_nonblock() just like qemu_set_cloexec(). Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
2013-03-26migration: do not sent zero pages in bulk stagePeter Lieven
during bulk stage of ram migration if a page is a zero 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_DONTNEED at the target upon receipt of a zero page I have observed that the target starts swapping if the memory is overcommitted. it seems that the pages are dropped asynchronously. this patch also updates QMP to return the number of skipped pages in MigrationStats. Signed-off-by: Peter Lieven <pl@kamp.de> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Juan Quintela <quintela@redhat.com>
2013-03-11migration: inline migrate_fd_closePaolo Bonzini
Reviewed-by: Orit Wasserman <owasserm@redhat.com> Reviewed-by: Juan Quintela <quintela@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Juan Quintela <quintela@redhat.com>
2013-03-11migration: eliminate s->migration_filePaolo Bonzini
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> Signed-off-by: Juan Quintela <quintela@redhat.com>
2013-03-11migration: move contents of migration_close to migrate_fd_cleanupPaolo Bonzini
With this patch, the migration_file is not needed anymore. Reviewed-by: Orit Wasserman <owasserm@redhat.com> Reviewed-by: Juan Quintela <quintela@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Juan Quintela <quintela@redhat.com>
2013-03-11migration: move rate limiting to QEMUFilePaolo Bonzini
Rate limiting is now simply a byte counter; client call qemu_file_rate_limit() manually to determine if they have to exit. So it is possible and simple to move the functionality to QEMUFile. This makes the remaining functionality of s->file redundant; in the next patch we can remove it and write directly to s->migration_file. Reviewed-by: Orit Wasserman <owasserm@redhat.com> Reviewed-by: Juan Quintela <quintela@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Juan Quintela <quintela@redhat.com>
2013-03-11migration: small changes around rate-limitingPaolo Bonzini
This patch extracts a few small changes from the next patch, which are unrelated to adding generic rate-limiting functionality to QEMUFile. Make migration_set_rate_limit a simple accessor, and use qemu_file_set_rate_limit consistently. Also fix a typo where INT_MAX should have been SIZE_MAX. Reviewed-by: Orit Wasserman <owasserm@redhat.com> Reviewed-by: Juan Quintela <quintela@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Juan Quintela <quintela@redhat.com>
2013-03-11migration: use qemu_ftell to compute bandwidthPaolo Bonzini
Prepare for when s->bytes_xfer will be removed. Reviewed-by: Orit Wasserman <owasserm@redhat.com> Reviewed-by: Juan Quintela <quintela@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Juan Quintela <quintela@redhat.com>
2013-03-11migration: use QEMUFile for writing outgoing migration dataPaolo Bonzini
Second, drop the file descriptor indirection, and write directly to the QEMUFile. Reviewed-by: Orit Wasserman <owasserm@redhat.com> Reviewed-by: Juan Quintela <quintela@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Juan Quintela <quintela@redhat.com>
2013-03-11migration: use QEMUFile for migration channel lifetimePaolo Bonzini
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 write callbacks. Reviewed-by: Orit Wasserman <owasserm@redhat.com> Reviewed-by: Juan Quintela <quintela@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Juan Quintela <quintela@redhat.com>
2013-03-11migration: use qemu_file_rate_limit consistentlyPaolo Bonzini
Reviewed-by: Orit Wasserman <owasserm@redhat.com> Reviewed-by: Juan Quintela <quintela@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Juan Quintela <quintela@redhat.com>
2013-03-11migration: remove useless qemu_file_get_error checkPaolo Bonzini
migration_put_buffer is never called if there has been an error. Reviewed-by: Orit Wasserman <owasserm@redhat.com> Reviewed-by: Juan Quintela <quintela@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Juan Quintela <quintela@redhat.com>
2013-03-11migration: detect error before sleepingPaolo Bonzini
Reviewed-by: Orit Wasserman <owasserm@redhat.com> Reviewed-by: Juan Quintela <quintela@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Juan Quintela <quintela@redhat.com>
2013-03-11migration: eliminate last_roundPaolo Bonzini
We will go around the loop exactly once after setting last_round. Eliminate the variable altogether. Reviewed-by: Orit Wasserman <owasserm@redhat.com> Reviewed-by: Juan Quintela <quintela@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Juan Quintela <quintela@redhat.com>
2013-03-11Rename buffered_ to migration_Juan Quintela
This is consistent once that we have moved everything to migration.c Reviewed-by: Orit Wasserman <owasserm@redhat.com> Reviewed-by: Juan Quintela <quintela@redhat.com> Signed-off-by: Juan Quintela <quintela@redhat.com>
2013-03-11migration: yay, buffering is gonePaolo Bonzini
Buffering was needed because blocking writes could take a long time and starve other threads seeking to grab the big QEMU mutex. Now that all writes (except within _complete callbacks) are done outside the big QEMU mutex, we do not need buffering at all. Reviewed-by: Orit Wasserman <owasserm@redhat.com> Reviewed-by: Juan Quintela <quintela@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Juan Quintela <quintela@redhat.com>
2013-03-11migration: run setup callbacks out of big lockPaolo Bonzini
Only the migration_bitmap_sync() call needs the iothread lock. Reviewed-by: Orit Wasserman <owasserm@redhat.com> Reviewed-by: Juan Quintela <quintela@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Juan Quintela <quintela@redhat.com>
2013-03-11migration: run pending/iterate callbacks out of big lockPaolo Bonzini
This makes it possible to do blocking writes directly to the socket, with no buffer in the middle. For RAM, only the migration_bitmap_sync() call needs the iothread lock. For block migration, it is needed by the block layer (including bdrv_drain_all and dirty bitmap access), but because some code is shared between iterate and complete, all of mig_save_device_dirty is run with the lock taken. In the savevm case, the iterate callback runs within the big lock. This is annoying because it complicates the rules. Luckily we do not need to do anything about it: the RAM iterate callback does not need the iothread lock, and block migration never runs during savevm. Reviewed-by: Orit Wasserman <owasserm@redhat.com> Reviewed-by: Juan Quintela <quintela@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Juan Quintela <quintela@redhat.com>
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