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2014-02-08vmstate: Add uint32 2D-array supportChristoffer Dall
Add support for saving VMState of 2D arrays of uint32 values. Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org> Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2014-02-04Don't abort on memory allocation errorOrit Wasserman
It is better to fail migration in case of failure to allocate new cache item 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>
2014-02-04vmstate: Make VMSTATE_STRUCT_POINTER take type, not ptr-to-typePeter Maydell
The VMSTATE_STRUCT_POINTER macros are a bit odd in that they must be passed an argument "FooType *" rather than just taking the FooType. They're only used in one place, so it's easy to tidy this up. This also lets us use the macro to replace the hand-rolled VMSTATE_PTIMER. Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Signed-off-by: Juan Quintela <quintela@redhat.com>
2014-01-13migration: Move QEMU_VM_* defines to migration/migration.hEduardo Habkost
The VMState code will be moved to vmstate.c and it uses some of the QEMU_VM_* constants, so move it to a header. Signed-off-by: Eduardo Habkost <ehabkost@redhat.com> Reviewed-by: Orit Wasserman <owasserm@redhat.com> Signed-off-by: Juan Quintela <quintela@redhat.com>
2014-01-13qemu-file: Make a few functions non-staticEduardo Habkost
The QEMUFile code will be moved to qemu-file.c. This will require making the following functions non-static because they are used by the savevm.c code: * qemu_peek_byte() * qemu_peek_buffer() * qemu_file_skip() * qemu_file_set_error() Signed-off-by: Eduardo Habkost <ehabkost@redhat.com> Reviewed-by: Orit Wasserman <owasserm@redhat.com> Signed-off-by: Juan Quintela <quintela@redhat.com>
2013-12-17vmstate: Add support for an array of ptimer_state *Peter Maydell
Add support for defining a vmstate field which is an array of pointers to structures, and use this to define a VMSTATE_PTIMER_ARRAY() which allows an array of ptimer_state* to be used by devices. Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Message-id: 1387159292-10436-2-git-send-email-lig.fnst@cn.fujitsu.com
2013-09-24migration: add version supporting macros for struct pointerAlexey Kardashevskiy
This adds version supporting macros VMSTATE_STRUCT_POINTER_TEST_V and VMSTATE_STRUCT_POINTER_V in addition to the already existing VMSTATE_STRUCT_POINTER and VMSTATE_STRUCT_POINTER_TEST macros. Cc: Andreas Färber <afaerber@suse.de> Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru> Signed-off-by: Juan Quintela <quintela@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>
2013-07-23rdma: 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: 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>
2013-07-23rdma: introduce ram_handle_compressed()Michael R. Hines
This gives RDMA shared access to madvise() on the destination side when 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> 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>
2013-07-12Add '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>
2013-06-27linux-user: Fix compilation failurePeter Maydell
Fix compilation failures for linux-user targets following recent migration related commits bd2fa51fcd and 43487c67. Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Message-id: 1372362818-4740-1-git-send-email-peter.maydell@linaro.org Signed-off-by: Anthony Liguori <aliguori@us.ibm.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: new QEMUFileOps hooksMichael R. Hines
These are the prototypes and implementation of new hooks that RDMA takes advantage of to perform dynamic page registration. An optional hook is also introduced for a custom function to be able to override the default save_page function. Also included are the prototypes and accessor methods used by arch_init.c which invoke funtions inside savevm.c to call out to the hooks that may or may not have been overridden inside of QEMUFileOps. 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>
2013-06-27rdma: export qemu_fflush()Michael R. Hines
RDMA uses this to flush the control channel before sending its own message to handle page registrations. 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>
2013-06-27rdma: introduce qemu_file_mode_is_not_valid()Michael R. Hines
QEMUFileRDMA also has read and write modes. This function is now shared to reduce code duplication. 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>
2013-06-27rdma: 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>
2013-06-27rdma: introduce qemu_update_position()Michael R. Hines
RDMA writes happen asynchronously, and thus the performance accounting also needs to be able to occur asynchronously. This allows anybody to call into savevm.c to update both f->pos as well as into arch_init.c to update the acct_info structure with up-to-date values when the RDMA transfer actually completes. Reviewed-by: Juan Quintela <quintela@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>
2013-04-15savevm: Implement block_writev_buffer()Kevin Wolf
Instead of breaking up RAM state into many small chunks, pass the iovec to the block layer for better performance. Signed-off-by: Kevin Wolf <kwolf@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
2013-04-05vmstate: Add support for two dimensional arraysPeter Maydell
Add support for migrating two dimensional arrays, by defining a set of new macros VMSTATE_*_2DARRAY paralleling the existing VMSTATE_*_ARRAY macros. 2D arrays are handled the same for actual state serialization; the only difference is that the type check has to change for a 2D array. Signed-off-by: Peter Maydell <peter.maydell@linaro.org> Reviewed-by: Igor Mitsyanko <i.mitsyanko@gmail.com> Message-id: 1363975375-3166-2-git-send-email-peter.maydell@linaro.org
2013-04-05vmstate.h: introduce VMSTATE_BUFFER_POINTER_UNSAFE macroIgor Mitsyanko
Macro could be used to migrate a dynamically allocated buffer of known size. Signed-off-by: Igor Mitsyanko <i.mitsyanko@gmail.com> Reviewed-by: Peter Maydell <peter.maydell@linaro.org> Message-id: 1362923278-4080-2-git-send-email-i.mitsyanko@gmail.com Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
2013-03-26Add qemu_put_buffer_asyncOrit Wasserman
This allows us to add a buffer to the iovec to send without copying it into the static buffer, the buffer will be sent later when qemu_fflush is called. Signed-off-by: Orit Wasserman <owasserm@redhat.com> Signed-off-by: Juan Quintela <quintela@redhat.com>
2013-03-26Add QemuFileWritevBuffer QemuFileOpsOrit Wasserman
This will allow us to write an iovec Signed-off-by: Orit Wasserman <owasserm@redhat.com> Reviewed-by: Juan Quintela <quintela@redhat.com> Signed-off-by: Juan Quintela <quintela@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>
2013-03-26savevm: Fix bugs in the VMSTATE_VBUFFER_MULTIPLY definitionDavid Gibson
The VMSTATE_BUFFER_MULTIPLY macro is misnamed - it actually specifies a variably sized buffer with VMS_VBUFFER, so should be named VMSTATE_VBUFFER_MULTIPLY. This patch fixes this (the macro had no current users under either name). In addition, unlike the other VMSTATE_VBUFFER variants, this macro did not specify VMS_POINTER. This patch fixes this bug as well. Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Juan Quintela <quintela@redhat.com>
2013-03-26savevm: Add VMSTATE_STRUCT_VARRAY_POINTER_UINT32David Gibson
Currently the savevm code contains a VMSTATE_STRUCT_VARRAY_POINTER_INT32 helper (a variably sized array with the number of elements in an int32_t), but not VMSTATE_STRUCT_VARRAY_POINTER_UINT32 (... with the number of elements in a uint32_t). This patch (trivially) fixes the deficiency. Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Juan Quintela <quintela@redhat.com>
2013-03-26savevm: Add VMSTATE_FLOAT64 helpersDavid Gibson
The current savevm code includes VMSTATE helpers for a number of commonly used data types, but not for the float64 type used by the internal floating point emulation code. This patch fixes the deficiency. Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Juan Quintela <quintela@redhat.com>
2013-03-26savevm: Add VMSTATE_UINTTL_EQUAL helperDavid Gibson
This adds an _EQUAL VMSTATE helper for target_ulongs, defined in terms of VMSTATE_UINT32_EQUAL or VMSTATE_UINT64_EQUAL as appropriate. Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Juan Quintela <quintela@redhat.com>
2013-03-26savevm: Add VMSTATE_UINT64_EQUAL helpersDavid Gibson
The savevm code already includes a number of *_EQUAL helpers which act as sanity checks verifying that the configuration of the saved state matches that of the machine we're loading into to work. Variants already exist for 8 bit 16 bit and 32 bit integers, but not 64 bit integers. This patch fills that hole, adding a UINT64 version. Signed-off-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Juan Quintela <quintela@redhat.com>
2013-03-12stubs: Add a vmstate_dummy struct for CONFIG_USER_ONLYAndreas Färber
Reviewed-by: Juan Quintela <quintela@redhat.com> Reviewed-by: Eduardo Habkost <ehabkost@redhat.com> Signed-off-by: Andreas Färber <afaerber@suse.de>
2013-03-12vmstate: Make vmstate_register() static inlineAndreas Färber
This avoids adding a duplicate stub for CONFIG_USER_ONLY. Suggested-by: Eduardo Habkost <ehabkost@redhat.com> Reviewed-by: Eduardo Habkost <ehabkost@redhat.com> Reviewed-by: Juan Quintela <quintela@redhat.com> Signed-off-by: Andreas Färber <afaerber@suse.de>
2013-03-11page_cache: dup memory on insertPeter Lieven
The page cache frees all data on finish, on resize and if there is collision on insert. So it should be the caches responsibility to dup the data that is stored in the cache. Signed-off-by: Peter Lieven <pl@kamp.de> Signed-off-by: Orit Wasserman <owasserm@redhat.com> Reviewed-by: Peter Maydell <peter.maydell@linaro.org> 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 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: 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>
2013-03-11qemu-file: add writable socket QEMUFilePaolo 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: merge qemu_popen_cmd with qemu_popenPaolo Bonzini
There is no reason for outgoing exec migration to do popen manually anymore (the reason used to be that we needed the FILE* to make it non-blocking). Use qemu_popen_cmd. 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>
2013-03-11qemu-file: make qemu_fflush and qemu_file_set_error private againPaolo 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: 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>
2013-03-11migration: reorder SaveVMHandlers membersPaolo Bonzini
This groups together the callbacks that later will have similar locking rules. 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: cleanup migration (including thread) in the iothreadPaolo Bonzini
Perform final cleanup in a bottom half, and add joining the thread to the series of cleanup actions. migrate_fd_error remains for connection error, but it doesn't need to cleanup anything 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: simplify error handlingPaolo Bonzini
Always use qemu_file_get_error to detect errors, since that is how QEMUFile itself drops I/O after an error occurs. There is no need to propagate and check return values all the time. Also remove the "complete" member, since we know that it is set (via migrate_fd_cleanup) only when the state changes. 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>
2013-03-11qemu-file: temporarily expose qemu_file_set_error and qemu_fflushPaolo Bonzini
Right now, migration cannot entirely rely on QEMUFile's automatic drop of I/O after an error, because it does its "real" I/O outside the put_buffer callback. To fix this until buffering is gone, expose qemu_file_set_error which we will use in buffered_flush. Similarly, buffered_flush is not a complete flush because some data may still reside in the QEMUFile's own buffer. This somewhat complicates the process of closing the migration thread. Again, when buffering is gone buffered_flush will disappear and calling qemu_fflush will not be needed; in the meanwhile, we expose the function for use in migration.c. 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>
2013-03-01hw: move fifo.[ch] to libqemuutilPaolo Bonzini
fifo.c is generic code that can be easily unit tested. So it belongs in libqemuutil. Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
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