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![Fabiano Rosas](/assets/img/avatar_default.png)
Replace the return path retry logic with finishing and restarting the thread. This fixes a race when resuming the migration that leads to a segfault. Currently when doing postcopy we consider that an IO error on the return path file could be due to a network intermittency. We then keep the thread alive but have it do cleanup of the 'from_dst_file' and wait on the 'postcopy_pause_rp' semaphore. When the user issues a migrate resume, a new return path is opened and the thread is allowed to continue. There's a race condition in the above mechanism. It is possible for the new return path file to be setup *before* the cleanup code in the return path thread has had a chance to run, leading to the *new* file being closed and the pointer set to NULL. When the thread is released after the resume, it tries to dereference 'from_dst_file' and crashes: Thread 7 "return path" received signal SIGSEGV, Segmentation fault. [Switching to Thread 0x7fffd1dbf700 (LWP 9611)] 0x00005555560e4893 in qemu_file_get_error_obj (f=0x0, errp=0x0) at ../migration/qemu-file.c:154 154 return f->last_error; (gdb) bt #0 0x00005555560e4893 in qemu_file_get_error_obj (f=0x0, errp=0x0) at ../migration/qemu-file.c:154 #1 0x00005555560e4983 in qemu_file_get_error (f=0x0) at ../migration/qemu-file.c:206 #2 0x0000555555b9a1df in source_return_path_thread (opaque=0x555556e06000) at ../migration/migration.c:1876 #3 0x000055555602e14f in qemu_thread_start (args=0x55555782e780) at ../util/qemu-thread-posix.c:541 #4 0x00007ffff38d76ea in start_thread (arg=0x7fffd1dbf700) at pthread_create.c:477 #5 0x00007ffff35efa6f in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:95 Here's the race (important bit is open_return_path happening before migration_release_dst_files): migration | qmp | return path --------------------------+-----------------------------+--------------------------------- qmp_migrate_pause() shutdown(ms->to_dst_file) f->last_error = -EIO migrate_detect_error() postcopy_pause() set_state(PAUSED) wait(postcopy_pause_sem) qmp_migrate(resume) migrate_fd_connect() resume = state == PAUSED open_return_path <-- TOO SOON! set_state(RECOVER) post(postcopy_pause_sem) (incoming closes to_src_file) res = qemu_file_get_error(rp) migration_release_dst_files() ms->rp_state.from_dst_file = NULL post(postcopy_pause_rp_sem) postcopy_pause_return_path_thread() wait(postcopy_pause_rp_sem) rp = ms->rp_state.from_dst_file goto retry qemu_file_get_error(rp) SIGSEGV ------------------------------------------------------------------------------------------- We can keep the retry logic without having the thread alive and waiting. The only piece of data used by it is the 'from_dst_file' and it is only allowed to proceed after a migrate resume is issued and the semaphore released at migrate_fd_connect(). Move the retry logic to outside the thread by waiting for the thread to finish before pausing the migration. Reviewed-by: Peter Xu <peterx@redhat.com> Signed-off-by: Fabiano Rosas <farosas@suse.de> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> Message-ID: <20230918172822.19052-8-farosas@suse.de>
530 lines
18 KiB
C
530 lines
18 KiB
C
/*
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* QEMU live migration
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*
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* Copyright IBM, Corp. 2008
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*
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* Authors:
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* Anthony Liguori <aliguori@us.ibm.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2. See
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* the COPYING file in the top-level directory.
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*
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*/
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#ifndef QEMU_MIGRATION_H
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#define QEMU_MIGRATION_H
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#include "exec/cpu-common.h"
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#include "hw/qdev-core.h"
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#include "qapi/qapi-types-migration.h"
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#include "qapi/qmp/json-writer.h"
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#include "qemu/thread.h"
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#include "qemu/coroutine_int.h"
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#include "io/channel.h"
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#include "io/channel-buffer.h"
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#include "net/announce.h"
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#include "qom/object.h"
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#include "postcopy-ram.h"
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#include "sysemu/runstate.h"
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struct PostcopyBlocktimeContext;
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#define MIGRATION_RESUME_ACK_VALUE (1)
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/*
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* 1<<6=64 pages -> 256K chunk when page size is 4K. This gives us
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* the benefit that all the chunks are 64 pages aligned then the
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* bitmaps are always aligned to LONG.
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*/
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#define CLEAR_BITMAP_SHIFT_MIN 6
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/*
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* 1<<18=256K pages -> 1G chunk when page size is 4K. This is the
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* default value to use if no one specified.
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*/
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#define CLEAR_BITMAP_SHIFT_DEFAULT 18
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/*
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* 1<<31=2G pages -> 8T chunk when page size is 4K. This should be
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* big enough and make sure we won't overflow easily.
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*/
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#define CLEAR_BITMAP_SHIFT_MAX 31
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/* This is an abstraction of a "temp huge page" for postcopy's purpose */
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typedef struct {
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/*
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* This points to a temporary huge page as a buffer for UFFDIO_COPY. It's
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* mmap()ed and needs to be freed when cleanup.
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*/
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void *tmp_huge_page;
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/*
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* This points to the host page we're going to install for this temp page.
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* It tells us after we've received the whole page, where we should put it.
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*/
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void *host_addr;
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/* Number of small pages copied (in size of TARGET_PAGE_SIZE) */
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unsigned int target_pages;
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/* Whether this page contains all zeros */
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bool all_zero;
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} PostcopyTmpPage;
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typedef enum {
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PREEMPT_THREAD_NONE = 0,
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PREEMPT_THREAD_CREATED,
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PREEMPT_THREAD_QUIT,
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} PreemptThreadStatus;
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/* State for the incoming migration */
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struct MigrationIncomingState {
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QEMUFile *from_src_file;
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/* Previously received RAM's RAMBlock pointer */
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RAMBlock *last_recv_block[RAM_CHANNEL_MAX];
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/* A hook to allow cleanup at the end of incoming migration */
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void *transport_data;
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void (*transport_cleanup)(void *data);
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/*
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* Used to sync thread creations. Note that we can't create threads in
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* parallel with this sem.
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*/
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QemuSemaphore thread_sync_sem;
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/*
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* Free at the start of the main state load, set as the main thread finishes
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* loading state.
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*/
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QemuEvent main_thread_load_event;
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/* For network announces */
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AnnounceTimer announce_timer;
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size_t largest_page_size;
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bool have_fault_thread;
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QemuThread fault_thread;
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/* Set this when we want the fault thread to quit */
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bool fault_thread_quit;
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bool have_listen_thread;
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QemuThread listen_thread;
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/* For the kernel to send us notifications */
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int userfault_fd;
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/* To notify the fault_thread to wake, e.g., when need to quit */
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int userfault_event_fd;
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QEMUFile *to_src_file;
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QemuMutex rp_mutex; /* We send replies from multiple threads */
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/* RAMBlock of last request sent to source */
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RAMBlock *last_rb;
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/*
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* Number of postcopy channels including the default precopy channel, so
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* vanilla postcopy will only contain one channel which contain both
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* precopy and postcopy streams.
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*
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* This is calculated when the src requests to enable postcopy but before
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* it starts. Its value can depend on e.g. whether postcopy preemption is
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* enabled.
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*/
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unsigned int postcopy_channels;
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/* QEMUFile for postcopy only; it'll be handled by a separate thread */
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QEMUFile *postcopy_qemufile_dst;
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/*
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* When postcopy_qemufile_dst is properly setup, this sem is posted.
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* One can wait on this semaphore to wait until the preempt channel is
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* properly setup.
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*/
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QemuSemaphore postcopy_qemufile_dst_done;
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/* Postcopy priority thread is used to receive postcopy requested pages */
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QemuThread postcopy_prio_thread;
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/*
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* Always set by the main vm load thread only, but can be read by the
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* postcopy preempt thread. "volatile" makes sure all reads will be
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* up-to-date across cores.
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*/
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volatile PreemptThreadStatus preempt_thread_status;
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/*
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* Used to sync between the ram load main thread and the fast ram load
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* thread. It protects postcopy_qemufile_dst, which is the postcopy
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* fast channel.
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*
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* The ram fast load thread will take it mostly for the whole lifecycle
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* because it needs to continuously read data from the channel, and
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* it'll only release this mutex if postcopy is interrupted, so that
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* the ram load main thread will take this mutex over and properly
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* release the broken channel.
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*/
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QemuMutex postcopy_prio_thread_mutex;
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/*
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* An array of temp host huge pages to be used, one for each postcopy
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* channel.
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*/
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PostcopyTmpPage *postcopy_tmp_pages;
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/* This is shared for all postcopy channels */
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void *postcopy_tmp_zero_page;
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/* PostCopyFD's for external userfaultfds & handlers of shared memory */
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GArray *postcopy_remote_fds;
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QEMUBH *bh;
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int state;
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/*
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* The incoming migration coroutine, non-NULL during qemu_loadvm_state().
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* Used to wake the migration incoming coroutine from rdma code. How much is
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* it safe - it's a question.
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*/
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Coroutine *loadvm_co;
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/* The coroutine we should enter (back) after failover */
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Coroutine *colo_incoming_co;
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QemuSemaphore colo_incoming_sem;
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/*
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* PostcopyBlocktimeContext to keep information for postcopy
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* live migration, to calculate vCPU block time
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* */
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struct PostcopyBlocktimeContext *blocktime_ctx;
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/* notify PAUSED postcopy incoming migrations to try to continue */
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QemuSemaphore postcopy_pause_sem_dst;
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QemuSemaphore postcopy_pause_sem_fault;
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/*
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* This semaphore is used to allow the ram fast load thread (only when
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* postcopy preempt is enabled) fall into sleep when there's network
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* interruption detected. When the recovery is done, the main load
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* thread will kick the fast ram load thread using this semaphore.
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*/
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QemuSemaphore postcopy_pause_sem_fast_load;
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/* List of listening socket addresses */
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SocketAddressList *socket_address_list;
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/* A tree of pages that we requested to the source VM */
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GTree *page_requested;
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/*
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* For postcopy only, count the number of requested page faults that
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* still haven't been resolved.
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*/
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int page_requested_count;
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/*
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* The mutex helps to maintain the requested pages that we sent to the
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* source, IOW, to guarantee coherent between the page_requests tree and
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* the per-ramblock receivedmap. Note! This does not guarantee consistency
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* of the real page copy procedures (using UFFDIO_[ZERO]COPY). E.g., even
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* if one bit in receivedmap is cleared, UFFDIO_COPY could have happened
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* for that page already. This is intended so that the mutex won't
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* serialize and blocked by slow operations like UFFDIO_* ioctls. However
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* this should be enough to make sure the page_requested tree always
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* contains valid information.
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*/
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QemuMutex page_request_mutex;
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/*
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* If postcopy preempt is enabled, there is a chance that the main
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* thread finished loading its data before the preempt channel has
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* finished loading the urgent pages. If that happens, the two threads
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* will use this condvar to synchronize, so the main thread will always
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* wait until all pages received.
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*/
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QemuCond page_request_cond;
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/*
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* Number of devices that have yet to approve switchover. When this reaches
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* zero an ACK that it's OK to do switchover is sent to the source. No lock
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* is needed as this field is updated serially.
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*/
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unsigned int switchover_ack_pending_num;
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};
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MigrationIncomingState *migration_incoming_get_current(void);
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void migration_incoming_state_destroy(void);
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void migration_incoming_transport_cleanup(MigrationIncomingState *mis);
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/*
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* Functions to work with blocktime context
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*/
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void fill_destination_postcopy_migration_info(MigrationInfo *info);
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#define TYPE_MIGRATION "migration"
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typedef struct MigrationClass MigrationClass;
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DECLARE_OBJ_CHECKERS(MigrationState, MigrationClass,
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MIGRATION_OBJ, TYPE_MIGRATION)
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struct MigrationClass {
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/*< private >*/
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DeviceClass parent_class;
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};
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struct MigrationState {
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/*< private >*/
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DeviceState parent_obj;
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/*< public >*/
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QemuThread thread;
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QEMUBH *vm_start_bh;
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QEMUBH *cleanup_bh;
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/* Protected by qemu_file_lock */
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QEMUFile *to_dst_file;
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/* Postcopy specific transfer channel */
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QEMUFile *postcopy_qemufile_src;
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/*
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* It is posted when the preempt channel is established. Note: this is
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* used for both the start or recover of a postcopy migration. We'll
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* post to this sem every time a new preempt channel is created in the
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* main thread, and we keep post() and wait() in pair.
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*/
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QemuSemaphore postcopy_qemufile_src_sem;
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QIOChannelBuffer *bioc;
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/*
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* Protects to_dst_file/from_dst_file pointers. We need to make sure we
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* won't yield or hang during the critical section, since this lock will be
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* used in OOB command handler.
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*/
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QemuMutex qemu_file_lock;
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/*
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* Used to allow urgent requests to override rate limiting.
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*/
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QemuSemaphore rate_limit_sem;
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/* pages already send at the beginning of current iteration */
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uint64_t iteration_initial_pages;
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/* pages transferred per second */
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double pages_per_second;
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/* bytes already send at the beginning of current iteration */
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uint64_t iteration_initial_bytes;
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/* time at the start of current iteration */
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int64_t iteration_start_time;
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/*
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* The final stage happens when the remaining data is smaller than
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* this threshold; it's calculated from the requested downtime and
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* measured bandwidth
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*/
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int64_t threshold_size;
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/* params from 'migrate-set-parameters' */
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MigrationParameters parameters;
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int state;
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/* State related to return path */
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struct {
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/* Protected by qemu_file_lock */
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QEMUFile *from_dst_file;
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QemuThread rp_thread;
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bool error;
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/*
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* We can also check non-zero of rp_thread, but there's no "official"
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* way to do this, so this bool makes it slightly more elegant.
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* Checking from_dst_file for this is racy because from_dst_file will
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* be cleared in the rp_thread!
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*/
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bool rp_thread_created;
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QemuSemaphore rp_sem;
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/*
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* We post to this when we got one PONG from dest. So far it's an
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* easy way to know the main channel has successfully established
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* on dest QEMU.
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*/
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QemuSemaphore rp_pong_acks;
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} rp_state;
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double mbps;
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/* Timestamp when recent migration starts (ms) */
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int64_t start_time;
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/* Total time used by latest migration (ms) */
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int64_t total_time;
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/* Timestamp when VM is down (ms) to migrate the last stuff */
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int64_t downtime_start;
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int64_t downtime;
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int64_t expected_downtime;
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bool capabilities[MIGRATION_CAPABILITY__MAX];
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int64_t setup_time;
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/*
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* State before stopping the vm by vm_stop_force_state().
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* If migration is interrupted by any reason, we need to continue
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* running the guest on source if it was running or restore its stopped
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* state.
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*/
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RunState vm_old_state;
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/* Flag set once the migration has been asked to enter postcopy */
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bool start_postcopy;
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/* Flag set after postcopy has sent the device state */
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bool postcopy_after_devices;
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/* Flag set once the migration thread is running (and needs joining) */
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bool migration_thread_running;
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/* Flag set once the migration thread called bdrv_inactivate_all */
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bool block_inactive;
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/* Migration is waiting for guest to unplug device */
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QemuSemaphore wait_unplug_sem;
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/* Migration is paused due to pause-before-switchover */
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QemuSemaphore pause_sem;
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/* The semaphore is used to notify COLO thread that failover is finished */
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QemuSemaphore colo_exit_sem;
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/* The event is used to notify COLO thread to do checkpoint */
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QemuEvent colo_checkpoint_event;
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int64_t colo_checkpoint_time;
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QEMUTimer *colo_delay_timer;
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/* The first error that has occurred.
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We used the mutex to be able to return the 1st error message */
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Error *error;
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/* mutex to protect errp */
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QemuMutex error_mutex;
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/* Do we have to clean up -b/-i from old migrate parameters */
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/* This feature is deprecated and will be removed */
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bool must_remove_block_options;
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/*
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* Global switch on whether we need to store the global state
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* during migration.
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*/
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bool store_global_state;
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/* Whether we send QEMU_VM_CONFIGURATION during migration */
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bool send_configuration;
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/* Whether we send section footer during migration */
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bool send_section_footer;
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/* Needed by postcopy-pause state */
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QemuSemaphore postcopy_pause_sem;
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/*
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* Whether we abort the migration if decompression errors are
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* detected at the destination. It is left at false for qemu
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* older than 3.0, since only newer qemu sends streams that
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* do not trigger spurious decompression errors.
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*/
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bool decompress_error_check;
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/*
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* This variable only affects behavior when postcopy preempt mode is
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* enabled.
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*
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* When set:
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*
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* - postcopy preempt src QEMU instance will generate an EOS message at
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* the end of migration to shut the preempt channel on dest side.
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*
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* - postcopy preempt channel will be created at the setup phase on src
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QEMU.
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*
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* When clear:
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*
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* - postcopy preempt src QEMU instance will _not_ generate an EOS
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* message at the end of migration, the dest qemu will shutdown the
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* channel itself.
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*
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* - postcopy preempt channel will be created at the switching phase
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* from precopy -> postcopy (to avoid race condition of misordered
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* creation of channels).
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*
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* NOTE: See message-id <ZBoShWArKDPpX/D7@work-vm> on qemu-devel
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* mailing list for more information on the possible race. Everyone
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* should probably just keep this value untouched after set by the
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* machine type (or the default).
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*/
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bool preempt_pre_7_2;
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/*
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* flush every channel after each section sent.
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*
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* This assures that we can't mix pages from one iteration through
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* ram pages with pages for the following iteration. We really
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* only need to do this flush after we have go through all the
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* dirty pages. For historical reasons, we do that after each
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* section. This is suboptimal (we flush too many times).
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* Default value is false. (since 8.1)
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*/
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bool multifd_flush_after_each_section;
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/*
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* This decides the size of guest memory chunk that will be used
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* to track dirty bitmap clearing. The size of memory chunk will
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* be GUEST_PAGE_SIZE << N. Say, N=0 means we will clear dirty
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* bitmap for each page to send (1<<0=1); N=10 means we will clear
|
|
* dirty bitmap only once for 1<<10=1K continuous guest pages
|
|
* (which is in 4M chunk).
|
|
*/
|
|
uint8_t clear_bitmap_shift;
|
|
|
|
/*
|
|
* This save hostname when out-going migration starts
|
|
*/
|
|
char *hostname;
|
|
|
|
/* QEMU_VM_VMDESCRIPTION content filled for all non-iterable devices. */
|
|
JSONWriter *vmdesc;
|
|
|
|
/*
|
|
* Indicates whether an ACK from the destination that it's OK to do
|
|
* switchover has been received.
|
|
*/
|
|
bool switchover_acked;
|
|
};
|
|
|
|
void migrate_set_state(int *state, int old_state, int new_state);
|
|
|
|
void migration_fd_process_incoming(QEMUFile *f, Error **errp);
|
|
void migration_ioc_process_incoming(QIOChannel *ioc, Error **errp);
|
|
void migration_incoming_process(void);
|
|
|
|
bool migration_has_all_channels(void);
|
|
|
|
uint64_t migrate_max_downtime(void);
|
|
|
|
void migrate_set_error(MigrationState *s, const Error *error);
|
|
|
|
void migrate_fd_connect(MigrationState *s, Error *error_in);
|
|
|
|
bool migration_is_setup_or_active(int state);
|
|
bool migration_is_running(int state);
|
|
|
|
int migrate_init(MigrationState *s, Error **errp);
|
|
bool migration_is_blocked(Error **errp);
|
|
/* True if outgoing migration has entered postcopy phase */
|
|
bool migration_in_postcopy(void);
|
|
MigrationState *migrate_get_current(void);
|
|
|
|
uint64_t ram_get_total_transferred_pages(void);
|
|
|
|
/* Sending on the return path - generic and then for each message type */
|
|
void migrate_send_rp_shut(MigrationIncomingState *mis,
|
|
uint32_t value);
|
|
void migrate_send_rp_pong(MigrationIncomingState *mis,
|
|
uint32_t value);
|
|
int migrate_send_rp_req_pages(MigrationIncomingState *mis, RAMBlock *rb,
|
|
ram_addr_t start, uint64_t haddr);
|
|
int migrate_send_rp_message_req_pages(MigrationIncomingState *mis,
|
|
RAMBlock *rb, ram_addr_t start);
|
|
void migrate_send_rp_recv_bitmap(MigrationIncomingState *mis,
|
|
char *block_name);
|
|
void migrate_send_rp_resume_ack(MigrationIncomingState *mis, uint32_t value);
|
|
int migrate_send_rp_switchover_ack(MigrationIncomingState *mis);
|
|
|
|
void dirty_bitmap_mig_before_vm_start(void);
|
|
void dirty_bitmap_mig_cancel_outgoing(void);
|
|
void dirty_bitmap_mig_cancel_incoming(void);
|
|
bool check_dirty_bitmap_mig_alias_map(const BitmapMigrationNodeAliasList *bbm,
|
|
Error **errp);
|
|
|
|
void migrate_add_address(SocketAddress *address);
|
|
|
|
int foreach_not_ignored_block(RAMBlockIterFunc func, void *opaque);
|
|
|
|
#define qemu_ram_foreach_block \
|
|
#warning "Use foreach_not_ignored_block in migration code"
|
|
|
|
void migration_make_urgent_request(void);
|
|
void migration_consume_urgent_request(void);
|
|
bool migration_rate_limit(void);
|
|
void migration_cancel(const Error *error);
|
|
|
|
void migration_populate_vfio_info(MigrationInfo *info);
|
|
void migration_reset_vfio_bytes_transferred(void);
|
|
void postcopy_temp_page_reset(PostcopyTmpPage *tmp_page);
|
|
|
|
#endif
|