In qemu-server, we already allocate 2 * $mem_size + 500 MiB for driver
state (which was 32 MiB long ago according to git history). It seems
likely that the 30 MiB cutoff in the savevm-async implementation was
chosen based on that.
In bug #4476 [0], another issue caused the iteration to not make any
progress and the state file filled up all the way to the 30 MiB +
pending_size cutoff. Since the guest is not stopped immediately after
the check, it can still dirty some RAM and the current cutoff is not
enough for a reproducer VM (was done while bug #4476 still was not
fixed), dirtying memory with
> stress-ng -B 2 --bigheap-growth 64.0M'
After entering the final stage, savevm actually filled up the state
file completely, leading to an I/O error. It's probably the same
scenario as reported in the bug report, the error message was fixed in
commit a020815 ("savevm-async: fix function name in error message")
after the bug report.
If not for the bug, the cutoff will only be reached by a VM that's
dirtying RAM faster than can be written to the storage, so increase
the cutoff to 100 MiB to have a bigger chance to finish successfully,
while still trying to not increase downtime too much for
non-hibernation snapshots.
[0]: https://bugzilla.proxmox.com/show_bug.cgi?id=4476
Signed-off-by: Fiona Ebner <f.ebner@proxmox.com>
when pend_postcopy is large. By definition, pend_postcopy won't
decrease when iterating, so a value larger than the cutoff of 400000
would lead to essentially empty iterations, filling up the state file
until only 30 MiB + pending_size remain and the second half of the
check would trigger.
Avoid this, by not considering pend_postcopy for the cutoff to enter
the final phase.
Signed-off-by: Fiona Ebner <f.ebner@proxmox.com>
Avoids a patch and is required to compile when not all patches are
applied. No functional change is intended.
Signed-off-by: Fiona Ebner <f.ebner@proxmox.com>
User-facing breaking change:
The slirp submodule for user networking got removed. It would be
necessary to add the --enable-slirp option to the build and/or install
the appropriate library to continue building it. Since PVE is not
explicitly supporting it, it would require additionally installing the
libslirp0 package on all installations and there is *very* little
mention on the community forum when searching for "slirp" or
"netdev user", the plan is to only enable it again if there is some
real demand for it.
Notable changes:
* The big change for this release is the rework of job locking, using
a job mutex and introducing _locked() variants of job API functions
moving away from call-side AioContext locking. See (in the qemu
submodule) commit 6f592e5aca ("job.c: enable job lock/unlock and
remove Aiocontext locks") and previous commits for context.
Changes required for the backup patches:
* Use WITH_JOB_LOCK_GUARD() and call the _locked() variant of job
API functions where appropriate (many are only availalbe as
a _locked() variant).
* Remove acquiring/releasing AioContext around functions taking the
job mutex lock internally.
The patch introducing sequential transaction support for jobs needs
to temporarily unlock the job mutex to call job_start() when
starting the next job in the transaction.
* The zeroinit block driver now marks its child as primary.
The documentation in include/block/block-common.h states:
> Filter node has exactly one FILTERED|PRIMARY child, and may have
> other children which must not have these bits
Without this, an assert will trigger when copying to a zeroinit target
with qemu-img convert, because bdrv_child_cb_attach() expects any
non-PRIMARY child to be not FILTERED:
> qemu-img convert -n -p -f raw -O raw input.raw zeroinit:output.raw
> qemu-img: ../block.c:1476: bdrv_child_cb_attach: Assertion
> `!(child->role & BDRV_CHILD_FILTERED)' failed.
Signed-off-by: Fiona Ebner <f.ebner@proxmox.com>
The documentation in include/io/channel.h states that -1 or
QIO_CHANNEL_ERR_BLOCK should be returned upon error. Simply passing
along the return value from the blk-functions has the potential to
confuse the call sides. Non-blocking mode is not implemented
currently, so -1 it is.
The "return ret" was mistakenly left over from the previous
QEMUFileOps based implementation. Also, use error_setg_errno(), since
the blk(_co)_p{readv,writev} functions return errno codes.
Signed-off-by: Fiona Ebner <f.ebner@proxmox.com>
to be in-line with what other implementations in QEMU do. Commit
1d39c7098bbfa6862cb96066c4f8f6735ea397c5 mentions the EIO bit and
the function is expected to return 0 upon success (see other
implementations).
Signed-off-by: Fiona Ebner <f.ebner@proxmox.com>
Notable changes:
* The only big change is the switch to using a custom QIOChannel for
savevm-async, because the previously used QEMUFileOps was dropped.
Changes to the current implementation:
* Switch to vector based methods as required for an IO channel. For
short reads the passed-in IO vector is stuffed with zeroes at the
end, just to be sure.
* For reading: The documentation in include/io/channel.h states that
at least one byte should be read, so also error out when whe are
at the very end instead of returning 0.
* For reading: Fix off-by-one error when request goes beyond end.
The wrong code piece was:
if ((pos + size) > maxlen) {
size = maxlen - pos - 1;
}
Previously, the last byte would not be read. It's actually
possible to get a snapshot .raw file that has content all the way
up the final 512 byte (= BDRV_SECTOR_SIZE) boundary without any
trailing zero bytes (I wrote a script to do it).
Luckily, it didn't cause a real issue, because qemu_loadvm_state()
is not interested in the final (i.e. QEMU_VM_VMDESCRIPTION)
section. The buffer for reading it is simply freed up afterwards
and the function will assume that it read the whole section, even
if that's not the case.
* For writing: Make use of the generated blk_pwritev() wrapper
instead of manually wrapping the coroutine to simplify and save a
few lines.
* Adapt to changed interfaces for blk_{pread,pwrite}:
* a9262f551e ("block: Change blk_{pread,pwrite}() param order")
* 3b35d4542c ("block: Add a 'flags' param to blk_pread()")
* bf5b16fa40 ("block: Make blk_{pread,pwrite}() return 0 on success")
Those changes especially affected the qemu-img dd patches, because
the context also changed, but also some of our block drivers used
the functions.
* Drop qemu-common.h include: it got renamed after essentially
everything was moved to other headers. The only remaining user I
could find for things dropped from the header between 7.0 and 7.1
was qemu_get_vm_name() in the iscsi-initiatorname patch, but it
already includes the header to which the function was moved.
Signed-off-by: Fiona Ebner <f.ebner@proxmox.com>
Without this change, it's necessary to send a second savevm-end QMP
command after aborting a snaphsot, before a new savevm-start QMP
command can succeed.
In process_savevm_finalize(), no longer set an error in the abort
scenario. If there already is another error, there's no need to
override it. If canceling was done intentionally, qmp_savevm_end()
is responsible for setting the state now.
Reported-by: Mira Limbeck <m.limbeck@proxmox.com>
Signed-off-by: Fiona Ebner <f.ebner@proxmox.com>
Reported in the community forum[0].
For 6.1.0, there were a few changes to the coroutine-sleep API, but
the adaptations in f376b2b ("update and rebase to QEMU v6.1.0") made
a mistake.
Currently, target_close_wait is NULL when passed to
qemu_co_sleep_ns_wakeable(), which further passes it to
qemu_co_sleep(), but there, it is dereferenced when trying to access
the 'to_wake' member:
> Thread 1 "kvm" received signal SIGSEGV, Segmentation fault.
> qemu_co_sleep (w=0x0) at ../util/qemu-coroutine-sleep.c:57
To fix it, create a proper struct and pass its address instead. Also
call qemu_co_sleep_wake unconditionally, because the NULL check (for
the 'to_wake' member) is done inside the function itself.
This patch is based on what the QEMU commits introducing the changes
to the coroutine-sleep API did to the callers in QEMU:
eaee072085 ("coroutine-sleep: allow qemu_co_sleep_wake that wakes nothing")
29a6ea24eb ("coroutine-sleep: replace QemuCoSleepState pointer with struct in the API")
[0]: https://forum.proxmox.com/threads/112130/
Tested-by: Mira Limbeck <m.limbeck@proxmox.com>
Signed-off-by: Fiona Ebner <f.ebner@proxmox.com>
Only very minor changes needed:
* Most patches in extra (or some version of them) are part of 7.0.0.
* aio_set_fd_handler got an extra parameter, but can just pass NULL
like we did for the related 'poll' parameter. See QEMU commit
826cc32423db2a99d184dbf4f507c737d7e7a4ae for more.
* Add include for qemu/memalign.h in vma.c and vma-writer.c.
* Add reverts for fixups of already reverted 0347a8fd4c ("block/rbd:
implement bdrv_co_block_status") that came in with 7.0.0. Those
fixups are not enough, see Proxmox bugzilla #4047.
* Two trivial context changes for bitmap-mirror patches.
* block_int.h got split up into multiple headers.
* Some context changes in configure and meson.build.
* Used the oppurtunity to squash fixup of bdrv_backuo_dump_create typo
in a later patch into the patch introducing the function (had to
move code to new header during rebase).
Signed-off-by: Fabian Ebner <f.ebner@proxmox.com>
Signed-off-by: Wolfgang Bumiller <w.bumiller@proxmox.com>
Introduce a new map line for skipping a certain drive, of the form
skip=drive-scsi0
Since in PVE, most archives are compressed and piped to vma for
restore, it's not easily possible to skip reads.
For the reader, a new skip flag for VmaRestoreState is added and the
target is allowed to be NULL if skip is specified when registering.
If
the skip flag is set, no writes will be made as well as no check for
duplicate clusters. Therefore, the flag is not set for verify.
Originally-by: Fabian Ebner <f.ebner@proxmox.com>
Signed-off-by: Fabian Ebner <f.ebner@proxmox.com>
Acked-by: Wolfgang Bumiller <w.bumiller@proxmox.com>
Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>
This is necessary for multi-disk backups where not all jobs are
immediately started after they are created. QEMU commit
06e0a9c16405c0a4c1eca33cf286cc04c42066a2 did already part of the work,
ensuring that new writes after job creation don't pass through to the
backup, but not yet for the MIRROR_SYNC_MODE_BITMAP case which is used
for PBS.
Signed-off-by: Fabian Ebner <f.ebner@proxmox.com>
Signed-off-by: Wolfgang Bumiller <w.bumiller@proxmox.com>
Notable changes:
* bdrv_co_p{discard,readv,writev,write_zeroes} function signatures
changed, to using int64_t for offsets/bytes and some still had int
rather than BrdvRequestFlags for the flags.
* job_cancel_sync now has a force parameter. Commit messages in
73895f3838cd7fdaf185cf1dbc47be58844a966f
4cfb3f05627ad82af473e7f7ae113c3884cd04e3
sound like using force=true makes more sense.
* Added 3 patches coming in via qemu-stable tag, most important one is
to work around a librbd issue.
* Added another 3 patches from qemu-devel to fix issue leading to
crash when live migrating with iothread.
* cluster_size calculation helper changed (see patch pve/0026).
* QAPI's if conditionals now use 'CONFIG_FOO' rather than
'defined(CONFIG_FOO)'
Signed-off-by: Fabian Ebner <f.ebner@proxmox.com>
Otherwise, the header might already get written by a coroutine and
registering further streams will fail after that.
Also adds a missing g_list_free call for the other GList that's used.
Reported in the community forum:
https://forum.proxmox.com/threads/104744/
Reproducer script (increase beyond 30 if the issue isn't triggered yet):
> #!/usr/bin/perl
>
> my $dir = "./vma-create-bug";
> mkdir $dir;
>
> my $archive_path = "$dir/vzdump-qemu-104-2202_02_02-00_00_00.vma";
> unlink $archive_path;
>
> my $cmd = "vma create $archive_path -v";
> for (my $i = 0; $i < 30; $i++) {
> system("truncate -s 1M $dir/drive-virtio$i.img");
> $cmd .= " drive-virtio$i=$dir/drive-virtio$i.img";
> }
> system($cmd);
Signed-off-by: Fabian Ebner <f.ebner@proxmox.com>
both of them depend on generated header files, so we have to specify
them as sources. Otherwise, it happens (at least on some machines)
that they will be compiled before the headers are generated, aborting
the build.
Signed-off-by: Dominik Csapak <d.csapak@proxmox.com>
libguestfs starts their helper VMs with `-machine accel=..` without a
machine type, and our pve version suffix handling would segfault in that
case. there might be other scripted use cases that are affected as well.
this regression was introduced with the rebase of our patch set on top
of 6.1.0
Fixes: f376b2b9e2
Signed-off-by: Fabian Grünbichler <f.gruenbichler@proxmox.com>
Very clean rebase, only the +pve version handling needed manual fixing.
Drops two applied patches from extra/ and adds one new from upstream
(extra/0001*, fixes VNC over unix sockets) as well as 3 of my own for
allowing password changes on custom VNC displays again (as seen and
reviewed upstream, but not yet applied).
Signed-off-by: Stefan Reiter <s.reiter@proxmox.com>
This drops debian/patches/pve/0005-PVE-Config-smm_available-false.patch
(and renumbers the remaining patches)
From what I could gather, this patch was originally added
due to issues with old kernels. Now we have users which
seem to run into issues *with* the patch.
All this does is toggle an option, and it's available via a
qemu CLI option anyway, so if dropping this patch causes
issues for some people we can just add an option to
qemu-server & UI control smm explicitly.
Signed-off-by: Wolfgang Bumiller <w.bumiller@proxmox.com>
Cc: Alexandre Derumier <aderumier@odiso.com>
Tested-by: Stefan Reiter <s.reiter@proxmox.com>
Mostly minor changes, bigger ones summarized:
* QEMU's internal backup code now uses a new async system, which allows
parallel requests - the default max_workers settings is 64, I chose
less, since 64 put enough stress on QEMU that the guest became
practically unusable during the backup, and 16 still shows quite a
nice measureable performance improvement. Little code changes for us
though.
* 'malformed' QAPI parameters/functions are now a build error (i.e.
using '_' vs '-'), I chose to just whitelist our calls in the name of
backwards compatibility.
* monitor OOB race fix now uses the upstream variant, cherry-picked from
origin/master since it's not in 6.0 by default
* last patch fixes a bug with snapshot rollback related to the new yank
system
Signed-off-by: Stefan Reiter <s.reiter@proxmox.com>
ran into this when live-restoring a backup configured for IO-threads,
got the good ol':
> qemu: qemu_mutex_unlock_impl: Operation not permitted
error.
Checking out the history of the related bdrv_backup_top_drop(*bs)
method, we can see that it used to do the AIO context acquiring too,
but in the backup path this was problematic and was changed to be
higher up in the call path in a upstream series from Stefan[0].
That said, this is a completely different code path and it is safe to
do so here. We always run from the main threads's AIO context here
and we call it only indirectly once, guarded by checking for
`s->drop_state == DropNone` and set `s->drop_state = DropRequested`
shortly before we schedule the track_drop() in a bh.
[0]: https://lists.gnu.org/archive/html/qemu-devel/2020-03/msg09139.html
Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>
Reads just nicer with a drain begin *and* end call. Also clearing the
backing link of the alloc track BDS makes it closer to
bdrv_backup_top_drop() with which this driver has a bit in common.
Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>
See added patches for more info, overview:
0044: slightly increase PBS performance by reducing allocations
0045: slightly increase block-stream performance for Ceph
0046: don't crash with block-stream on RBD
0047: add alloc-track driver for live restore
Signed-off-by: Stefan Reiter <s.reiter@proxmox.com>
Saving dirty bitmaps from our savevm-async code didn't work, since we
use a coroutine which holds the iothread mutex already (upstream savevm
is sync, migration uses a thread). Release the mutex before calling the
one function that (according to it's documentation) requires the lock to
*not* be held: qemu_savevm_state_pending.
Additionally, loading dirty bitmaps requires a call to
dirty_bitmap_mig_before_vm_start after "loadvm", which the upstream
savevm does explicitly afterwards - do that too.
This is exposed via the query-proxmox-support property
"pbs-dirty-bitmap-savevm".
Signed-off-by: Stefan Reiter <s.reiter@proxmox.com>
...instead of having them in the middle of the backup related patches.
These might (hopefully) become upstream at some point as well.
Signed-off-by: Stefan Reiter <s.reiter@proxmox.com>
Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>
Use blk_unref to drop the last reference, which will close the block
backend and flush all caches and outstanding writes.
This is especially important for restoring to Ceph, as the userspace
librbd caches will not be flushed if the application exits immediately,
leading to potentially incomplete restores.
Reported-by: Eneko Lacunza <elacunza@binovo.es>
Signed-off-by: Stefan Reiter <s.reiter@proxmox.com>
Lots of patches touched and some slight changes to the build process
since QEMU switched to meson as their build system. Functionality-wise
very little rebasing required.
New patches introduced:
* pve/0058: to fix VMA backups and clean up some code in general with
new 5.2 features now available to us (namely coroutine-enabled QMP).
* extra/0002: don't build man pages for guest agent when disabled
* extra/0003: fix live-migration with hugepages
* 0017 and 0018 are adjusted to fix snapshot abort and improve
snap performance a bit
Signed-off-by: Stefan Reiter <s.reiter@proxmox.com>
Fixes vma restore when the target is an iSCSI storage which expects that
initiatorname. Also avoids the need to always explicitly set the initiatorname
in PVE code, thus fixing moving efidisks from and to such iSCSI storages.
Signed-off-by: Fabian Ebner <f.ebner@proxmox.com>
Signed-off-by: Stefan Reiter <s.reiter@proxmox.com>
bump build-dependency on libproxmox-backup-qemu0-dev with version query
support
Signed-off-by: Fabian Grünbichler <f.gruenbichler@proxmox.com>
