riscv/qemu: QEMU main repository: Please see https://www.qemu.org/docs/master/devel/submitting-a-patch.html for how to submit changes to QEMU. Pull Requests are ignored. Please only use release tarballs from the QEMU website. http://www.qemu.org - qemu

QEMU main repository: Please see https://www.qemu.org/docs/master/devel/submitting-a-patch.html for how to submit changes to QEMU. Pull Requests are ignored. Please only use release tarballs from the QEMU website. http://www.qemu.org

emulation kvm qemu virtualization

History

Steve Sistare 624e6e654e migration: cpr-transfer mode Add the cpr-transfer migration mode, which allows the user to transfer a guest to a new QEMU instance on the same host with minimal guest pause time, by preserving guest RAM in place, albeit with new virtual addresses in new QEMU, and by preserving device file descriptors. Pages that were locked in memory for DMA in old QEMU remain locked in new QEMU, because the descriptor of the device that locked them remains open. cpr-transfer preserves memory and devices descriptors by sending them to new QEMU over a unix domain socket using SCM_RIGHTS. Such CPR state cannot be sent over the normal migration channel, because devices and backends are created prior to reading the channel, so this mode sends CPR state over a second "cpr" migration channel. New QEMU reads the cpr channel prior to creating devices or backends. The user specifies the cpr channel in the channel arguments on the outgoing side, and in a second -incoming command-line parameter on the incoming side. The user must start old QEMU with the the '-machine aux-ram-share=on' option, which allows anonymous memory to be transferred in place to the new process by transferring a memory descriptor for each ram block. Memory-backend objects must have the share=on attribute, but memory-backend-epc is not supported. The user starts new QEMU on the same host as old QEMU, with command-line arguments to create the same machine, plus the -incoming option for the main migration channel, like normal live migration. In addition, the user adds a second -incoming option with channel type "cpr". This CPR channel must support file descriptor transfer with SCM_RIGHTS, i.e. it must be a UNIX domain socket. To initiate CPR, the user issues a migrate command to old QEMU, adding a second migration channel of type "cpr" in the channels argument. Old QEMU stops the VM, saves state to the migration channels, and enters the postmigrate state. New QEMU mmap's memory descriptors, and execution resumes. The implementation splits qmp_migrate into start and finish functions. Start sends CPR state to new QEMU, which responds by closing the CPR channel. Old QEMU detects the HUP then calls finish, which connects the main migration channel. In summary, the usage is: qemu-system-$arch -machine aux-ram-share=on ... start new QEMU with "-incoming <main-uri> -incoming <cpr-channel>" Issue commands to old QEMU: migrate_set_parameter mode cpr-transfer {"execute": "migrate", ... {"channel-type": "main"...}, {"channel-type": "cpr"...} ... } Signed-off-by: Steve Sistare <steven.sistare@oracle.com> Reviewed-by: Peter Xu <peterx@redhat.com> Acked-by: Markus Armbruster <armbru@redhat.com> Link: https://lore.kernel.org/r/1736967650-129648-17-git-send-email-steven.sistare@oracle.com Signed-off-by: Fabiano Rosas <farosas@suse.de>		1 year ago
..
block-active.c	migration/block: Rewrite disk activation	1 year ago
block-dirty-bitmap.c	include: Rename sysemu/ -> system/	1 year ago
channel-block.c	io: follow coroutine AioContext in qio_channel_yield()	3 years ago
channel-block.h	migration: introduce a QIOChannel impl for BlockDriverState VMState	4 years ago
channel.c	migration: Fix migration_channel_read_peek() error path	2 years ago
channel.h	migration: check magic value for deciding the mapping of channels	3 years ago
colo-failover.c	migration/colo: Improve an x-colo-lost-heartbeat error message	3 years ago
colo-stubs.c	migration/colo: make colo_incoming_co() return void	2 years ago
colo.c	migration/block: Rewrite disk activation	1 year ago
cpr-transfer.c	migration: cpr-transfer save and load	1 year ago
cpr.c	migration: cpr-transfer mode	1 year ago
cpu-throttle.c	include: Rename sysemu/ -> system/	1 year ago
dirtyrate.c	include: Rename sysemu/ -> system/	1 year ago
dirtyrate.h	include: Rename sysemu/ -> system/	1 year ago
exec.c	migration: simplify exec migration functions	2 years ago
exec.h	migration: convert exec backend to accept MigrateAddress.	2 years ago
fd.c	migration: Allow pipes to keep working for fd migrations	1 year ago
fd.h	migration: Revert mapped-ram multifd support to fd: URI	2 years ago
file.c	migration/multifd: Pass in MultiFDPages_t to file_write_ramblock_iov	2 years ago
file.h	migration/multifd: Pass in MultiFDPages_t to file_write_ramblock_iov	2 years ago
global_state.c	include: Rename sysemu/ -> system/	1 year ago
meson.build	migration: cpr-transfer save and load	1 year ago
migration-hmp-cmds.c	include: Rename sysemu/ -> system/	1 year ago
migration-stats.c	migration: migration_rate_limit_reset() don't need the QEMUFile	2 years ago
migration-stats.h	migration: Remove transferred atomic counter	2 years ago
migration.c	migration: cpr-transfer mode	1 year ago
migration.h	migration: cpr-transfer mode	1 year ago
multifd-nocomp.c	multifd: bugfix for migration using compression methods	1 year ago
multifd-qatzip.c	multifd: bugfix for incorrect migration data with qatzip compression	1 year ago
multifd-qpl.c	multifd: bugfix for incorrect migration data with QPL compression	1 year ago
multifd-uadk.c	migration/multifd: Fix compile error caused by page_size usage	1 year ago
multifd-zero-page.c	migration/multifd: Move pages accounting into multifd_send_zero_page_detect()	2 years ago
multifd-zlib.c	migration/multifd: Make MultiFDMethods const	2 years ago
multifd-zstd.c	migration/multifd: Fix loop conditions in multifd_zstd_send_prepare and multifd_zstd_recv	2 years ago
multifd.c	migration/multifd: Fix compat with QEMU < 9.0	1 year ago
multifd.h	migration/multifd: Cleanup src flushes on condition check	1 year ago
options.c	migration: cpr-transfer mode	1 year ago
options.h	migration: Use device_class_set_props_n	1 year ago
page_cache.c	migration: Fix cache_init()'s "Failed to allocate" error messages	5 years ago
page_cache.h	migration: Clean up signed vs. unsigned XBZRLE cache-size	5 years ago
postcopy-ram.c	include: Rename sysemu/ -> system/	1 year ago
postcopy-ram.h	migration/postcopy: Add postcopy-recover-setup phase	2 years ago
qemu-file.c	migration: SCM_RIGHTS for QEMUFile	1 year ago
qemu-file.h	migration: SCM_RIGHTS for QEMUFile	1 year ago
ram.c	migration: cpr-transfer mode	1 year ago
ram.h	migration/ram: Move RAM_SAVE_FLAG* into ram.h	1 year ago
rdma.c	migration/rdma: Fix a memory issue for migration	2 years ago
rdma.h	migration/ram: Move RAM_SAVE_FLAG* into ram.h	1 year ago
savevm.c	migration: fix -Werror=maybe-uninitialized	1 year ago
savevm.h	migration: Add Error** argument to qemu_savevm_state_setup()	2 years ago
socket.c	migration: Remove unused socket_send_channel_create_sync	1 year ago
socket.h	migration: Remove unused socket_send_channel_create_sync	1 year ago
target.c	migration: Add migration prefix to functions in target.c	3 years ago
threadinfo.c	migration/multifd: Protect accesses to migration_threads	3 years ago
threadinfo.h	migration/multifd: Protect accesses to migration_threads	3 years ago
tls.c	migration: Drop unused parameter for migration_tls_client_create()	3 years ago
tls.h	migration: Drop unused parameter for migration_tls_client_create()	3 years ago
trace-events	migration: cpr-transfer save and load	1 year ago
trace.h	trace: switch position of headers to what Meson requires	6 years ago
vmstate-types.c	migration: cpr-transfer mode	1 year ago
vmstate.c	migration: Fix arrays of pointers in JSON writer	1 year ago
xbzrle.c	migration/xbzrle: Use i386 host/cpuinfo.h	3 years ago
xbzrle.h	migration/xbzrle: Use i386 host/cpuinfo.h	3 years ago
yank_functions.c	migration/yank: Use channel features	2 years ago
yank_functions.h	migration: Move the yank unregister of channel_close out	5 years ago