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>
cherry-picked cleanly from 6.0 development tree, fixes an issue with
resizing RBD drives (and reportedly also on krbd or potentially other
storage backends) with iothreads.
Signed-off-by: Stefan Reiter <s.reiter@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>
The idea in general is to migrate all the state, which is small for
us, in a single step once. But, QEMU only calls save state if we
return active true.
Hardcoding is-active to return true, like done initially, makes the
migration freeze, as QEMU thinks this is never done, and only stops
calling us and finishes after a few seconds.
So, add a state with an "active" boolean, set to true when
initializing a migration, and set it to false when the state was
saved.
Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>
With the transaction patches, patch 0026-PVE-Backup-modify-job-api.patch
is no longer necessary, so drop it and rebase all following patches on
top.
Signed-off-by: Stefan Reiter <s.reiter@proxmox.com>
Prints QEMU errors that occur *after* the "-daemonize" fork to the
systemd journal, instead of pushing them into /dev/null like before.
Signed-off-by: Stefan Reiter <s.reiter@proxmox.com>
this is needed for template backups with PBS until we have the backup
equivalent of 'pbs-restore'.
Signed-off-by: Fabian Grünbichler <f.gruenbichler@proxmox.com>
No major semantic changes, mostly just deprecations and changed function
signatures. Drop the extra/ patches, as they have been applied upstream.
The added extra/ patch was accepted upstream[0] but has not been picked
up for 5.1. It is required for non-4M aligned backups to work with PBS.
[0] https://lists.gnu.org/archive/html/qemu-devel/2020-08/msg01671.html
Signed-off-by: Stefan Reiter <s.reiter@proxmox.com>
fixes an assertion failure in qemu network packet processing, which can
lead to DOS'ing the qemu process on the host. this affects 'e1000e' and
'vmxnet3' network devices.
patch is cherry-picked from the commit mentioned in the oss-security email.
more info on oss-security [0]
[0]: https://www.openwall.com/lists/oss-security/2020/08/10/1
Signed-off-by: Oguz Bektas <o.bektas@proxmox.com>
"PVE backup: rename incremental to use-dirty-bitmap" merged two
variables (use_dirty_bitmap and incremental) into one, but they served
two different purposes. Rename the original use_dirty_bitmap to
"expect_only_dirty" so the new one doesn't conflict, and rework "PVE:
use proxmox_backup_check_incremental" around that semantic.
In practice, this had the effect that only one disk at a time would
have a bitmap added, as after the first "use_dirty_bitmap" would be set
to one and the rest would behave as if the QMP parameter of the same
name was unset.
Signed-off-by: Stefan Reiter <s.reiter@proxmox.com>
* rename "incremental" param to "use-dirty-bitmap", avoids confusion
as the backup can be incrementally also with that param set to
false.
* use new proxmox_backup_check_incremental
* fix setting dirty counter and adapt to new connect API semantic
Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>
Add trailing newline to two error messages, and drop an extra
unconditional `qdict_put_str(options, "driver", format);`
Besides that it's just formatting.
Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>
Move qemu_savevm_state_{header,setup} into the main loop and
the rest of the iteration into a coroutine. The former need
to lock the iothread (and we can't unlock it in the
coroutine), and the latter can't deal with being in a
separate thread, so a coroutine it must be.
Signed-off-by: Wolfgang Bumiller <w.bumiller@proxmox.com>
Release the lock on qemu_coroutine_yield, so coroutines don't
deadlock.
Originally-by: Stefan Reiter <s.reiter@proxmox.com>
Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>
the first two patches were mistakenly left out during the 4.2 qemu
rebase.
also adds another patch for issue CVE-2019-14378 (heap-based BOF)
Signed-off-by: Oguz Bektas <o.bektas@proxmox.com>
The long overdue nice rebase+cleanup was done by Dietmar
Originally-by: Dietmar Maurer <dietmar@proxmox.com>
Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>
original commits and email can be found here[0]
A out-of-bounds heap buffer access issue was found in the SLiRP
networking implementation of the QEMU emulator. It occurs in tcp_emu()
routine while emulating IRC and other protocols due to unsafe usage of
snprintf(3) function.
A user/process could use this flaw to crash the Qemu process on the host
resulting in DoS or potentially execute arbitrary code with privileges
of the QEMU process on the host.
[0]: https://seclists.org/oss-sec/2020/q1/64
Signed-off-by: Oguz Bektas <o.bektas@proxmox.com>
Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>
oss-security email can be found here[0]
upstream commit here[1]
this effects our vncproxy. dominik and me tested if the issue is present
on our branch and it appears that it is.
in essence when we disconnect from a vnc connection, the memory isn't
free'd afterwards which causes the qemu process to use more and more
memory with each disconnect, which could lead to a dos scenario.
we tested the patch and it seems to mitigate the problem.
[0]: https://seclists.org/oss-sec/2020/q1/105
[1]: https://git.qemu.org/?p=qemu.git;a=commitdiff;h=6bf21f3d83e95bcc4ba35a7a07cc6655e8b010b0
Tested-by: Dominik Csapak <d.csapak@proxmox.com>
Signed-off-by: Oguz Bektas <o.bektas@proxmox.com>
* Fix VMA tool build
* Change PVE code to new blockjob API
* Acquire missing lock for block_job_add_bdrv
Signed-off-by: Stefan Reiter <s.reiter@proxmox.com>
fixes for:
* CVE-2018-12126
* CVE-2018-12127
* CVE-2018-12130
* CVE-2019-11091
adds the md-clear cpuflag.
Not included by default in any Intel CPU model.
Must be explicitly turned on for all Intel CPU models.
Requires the host CPU microcode to support this feature before it
can be used for guest CPUs.
Signed-off-by: Oguz Bektas <o.bektas@proxmox.com>
