'qemu-img map' provides a way to determine which extents of an image
come from the top layer vs. inherited from a backing chain. This is
useful information worth exposing over NBD. There is a proposal to
add a QMP command block-dirty-bitmap-populate which can create a dirty
bitmap that reflects allocation information, at which point the
qemu:dirty-bitmap:NAME metadata context can expose that information
via the creation of a temporary bitmap, but we can shorten the effort
by adding a new qemu:allocation-depth metadata context that does the
same thing without an intermediate bitmap (this patch does not
eliminate the need for that proposal, as it will have other uses as
well).
While documenting things, remember that although the NBD protocol has
NBD_OPT_SET_META_CONTEXT, the rest of its documentation refers to
'metadata context', which is a more apt description of what is
actually being used by NBD_CMD_BLOCK_STATUS: the user is requesting
metadata by passing one or more context names. So I also touched up
some existing wording to prefer the term 'metadata context' where it
makes sense.
Note that this patch does not actually enable any way to request a
server to enable this context; that will come in the next patch.
Signed-off-by: Eric Blake <eblake@redhat.com>
Message-Id: <20201027050556.269064-10-eblake@redhat.com>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
When checking for allocation across a chain, it's already easy to
count the depth within the chain at which the allocation is found.
Instead of throwing that information away, return it to the caller.
Existing callers only cared about allocated/non-allocated, but having
a depth available will be used by NBD in the next patch.
Signed-off-by: Eric Blake <eblake@redhat.com>
Message-Id: <20201027050556.269064-9-eblake@redhat.com>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
[eblake: rebase to master]
Signed-off-by: Eric Blake <eblake@redhat.com>
With this, 'qemu-nbd -B b0 -B b1 -f qcow2 img.qcow2' can let you sniff
out multiple bitmaps from one server. qemu-img as client can still
only read one bitmap per client connection, but other NBD clients
(hello libnbd) can now read multiple bitmaps in a single pass.
Signed-off-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Message-Id: <20201027050556.269064-8-eblake@redhat.com>
Rather than open-code the count of negotiated contexts at several
sites, embed it directly into the struct. This will make it easier
for upcoming commits to support even more simultaneous contexts.
Signed-off-by: Eric Blake <eblake@redhat.com>
Message-Id: <20201027050556.269064-7-eblake@redhat.com>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Each dirty bitmap already knows its name; by reducing the scope of the
places where we construct "qemu:dirty-bitmap:NAME" strings, tracking
the name is more localized, and there are fewer per-export fields to
worry about. This in turn will make it easier for an upcoming patch
to export more than one bitmap at once.
Signed-off-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Message-Id: <20201027050556.269064-6-eblake@redhat.com>
Since 'block-export-add' is new to 5.2, we can still tweak the
interface; there, allowing 'bitmaps':['str'] is nicer than
'bitmap':'str'. This wires up the qapi and qemu-nbd changes to permit
passing multiple bitmaps as distinct metadata contexts that the NBD
client may request, but the actual support for more than one will
require a further patch to the server.
Note that there are no changes made to the existing deprecated
'nbd-server-add' command; this required splitting the QAPI type
BlockExportOptionsNbd, which fortunately does not affect QMP
introspection.
Signed-off-by: Eric Blake <eblake@redhat.com>
Message-Id: <20201027050556.269064-5-eblake@redhat.com>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Peter Krempa <pkrempa@redhat.com>
Rather than open-coding the translation from the deprecated
NbdServerAddOptions type to the preferred BlockExportOptionsNbd, it's
better to utilize QAPI_CLONE_MEMBERS. This solves a couple of issues:
first, if we do any more refactoring of the base type (which an
upcoming patch plans to do), we don't have to revisit the open-coding.
Second, our assignment to arg->name is fishy: the generated QAPI code
for qapi_free_NbdServerAddOptions does not visit arg->name if
arg->has_name is false, but if it DID visit it, we would have
introduced a double-free situation when arg is finally freed.
Signed-off-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <20201027050556.269064-4-eblake@redhat.com>
block.c has a useful macro QAPI_LIST_ADD() for inserting at the front
of any QAPI-generated list; move it from block.c to qapi/util.h so
more places can use it, including one earlier place in block.c, and
rename it to something more obvious (since we also have a lot of
places that append, rather than prepend, to a list).
There are many more places in the codebase that can benefit from using
the macro, but converting them will be left to later patches.
In theory, all QAPI list types are child classes of GenericList; but
in practice, that relationship is not explicitly spelled out in the C
type declarations (rather, it is something that happens implicitly due
to C compatible layouts), and the macro does not actually depend on
the GenericList type. We considered moving GenericList from visitor.h
into util.h to group related code; however, such a move would be
awkward if we do not also move GenericAlternate. Unfortunately,
moving GenericAlternate would introduce its own problems of
declaration circularity (qapi-builtin-types.h needs a complete
definition of QEnumLookup from util.h, but GenericAlternate needs a
complete definition of QType from qapi-builtin-types.h).
Suggested-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Signed-off-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Message-Id: <20201027050556.269064-3-eblake@redhat.com>
[eblake: s/ADD/PREPEND/ per suggestion by Markus]
There is no need to rely on the verbosity of the gcc/clang compiler
extension of g_new(typeof(X), 1) when we can instead use the standard
g_malloc(sizeof(X)). In general, we like g_new over g_malloc for
returning type X rather than void* to let the compiler catch more
potential typing mistakes, but in this particular macro, our other use
of typeof on the same line already ensures we are getting correct
results.
Suggested-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Eric Blake <eblake@redhat.com>
Message-Id: <20201027050556.269064-2-eblake@redhat.com>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Markus Armbruster <armbru@redhat.com>
nbd_server_start_unix_socket() includes an implicit nbd_server_stop(),
but we still need an explicit one at the end of the test (where there
follows no next nbd_server_start_unix_socket()), or qemu-nbd will linger
until the test exits.
This will become important when enabling this test to run on FUSE
exports, because then the export (which is the image used by qemu-nbd)
will go away before qemu-nbd exits, which will lead to qemu-nbd
complaining that it cannot flush the bitmaps in the image.
Signed-off-by: Max Reitz <mreitz@redhat.com>
Message-Id: <20201027164416.144115-3-mreitz@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Eric Blake <eblake@redhat.com>
We need to let _img_info emit the format-specific information so we get
the list of bitmaps we want, but we do not need anything but the
bitmaps. So filter out everything that is irrelevant to us. (Ideally,
this would be a generalized function in common.filters that takes a list
of things to keep, but that would require implementing an anti-bitmap
filter, which would be hard, and which we do not need here. So that is
why this function is just a local hack.)
This lets 291 pass with qcow2 options like refcount_bits or data_file
again.
Fixes: 14f16bf947
("qemu-img: Support bitmap --merge into backing image")
Signed-off-by: Max Reitz <mreitz@redhat.com>
Message-Id: <20201027164416.144115-2-mreitz@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Eric Blake <eblake@redhat.com>
- qcow2: Skip copy-on-write when allocating a zero cluster
- qemu-img: add support for rate limit in qemu-img convert/commit
- Fix deadlock when deleting a block node during drain_all
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Merge remote-tracking branch 'remotes/kevin/tags/for-upstream' into staging
Block layer patches:
- qcow2: Skip copy-on-write when allocating a zero cluster
- qemu-img: add support for rate limit in qemu-img convert/commit
- Fix deadlock when deleting a block node during drain_all
# gpg: Signature made Tue 27 Oct 2020 15:14:07 GMT
# gpg: using RSA key DC3DEB159A9AF95D3D7456FE7F09B272C88F2FD6
# gpg: issuer "kwolf@redhat.com"
# gpg: Good signature from "Kevin Wolf <kwolf@redhat.com>" [full]
# Primary key fingerprint: DC3D EB15 9A9A F95D 3D74 56FE 7F09 B272 C88F 2FD6
* remotes/kevin/tags/for-upstream:
block: End quiescent sections when a BDS is deleted
qcow2: Skip copy-on-write when allocating a zero cluster
qcow2: Report BDRV_BLOCK_ZERO more accurately in bdrv_co_block_status()
qemu-img: add support for rate limit in qemu-img convert
qemu-img: add support for rate limit in qemu-img commit
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Here's the next pull request for ppc and spapr related patches, which
should be the last things for soft freeze. Includes:
* Numerous error handling cleanups from Greg Kurz
* Cleanups to cpu realization and hotplug handling from Greg Kurz
* A handful of other small fixes and cleanups
This does include a change to pc_dimm_plug() that isn't in my normal
areas of concern. That's there as a a prerequisite for ppc specific
changes, and has an ack from Igor.
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Merge remote-tracking branch 'remotes/dgibson/tags/ppc-for-5.2-20201028' into staging
ppc patch queue 2020-10-28
Here's the next pull request for ppc and spapr related patches, which
should be the last things for soft freeze. Includes:
* Numerous error handling cleanups from Greg Kurz
* Cleanups to cpu realization and hotplug handling from Greg Kurz
* A handful of other small fixes and cleanups
This does include a change to pc_dimm_plug() that isn't in my normal
areas of concern. That's there as a a prerequisite for ppc specific
changes, and has an ack from Igor.
# gpg: Signature made Tue 27 Oct 2020 14:13:21 GMT
# gpg: using RSA key 75F46586AE61A66CC44E87DC6C38CACA20D9B392
# gpg: Good signature from "David Gibson <david@gibson.dropbear.id.au>" [full]
# gpg: aka "David Gibson (Red Hat) <dgibson@redhat.com>" [full]
# gpg: aka "David Gibson (ozlabs.org) <dgibson@ozlabs.org>" [full]
# gpg: aka "David Gibson (kernel.org) <dwg@kernel.org>" [unknown]
# Primary key fingerprint: 75F4 6586 AE61 A66C C44E 87DC 6C38 CACA 20D9 B392
* remotes/dgibson/tags/ppc-for-5.2-20201028:
ppc/: fix some comment spelling errors
spapr: Improve spapr_reallocate_hpt() error reporting
target/ppc: Fix kvmppc_load_htab_chunk() error reporting
spapr: Use error_append_hint() in spapr_reallocate_hpt()
spapr: Simplify error handling in spapr_memory_plug()
spapr: Pass &error_abort when getting some PC DIMM properties
spapr: Use appropriate getter for PC_DIMM_SLOT_PROP
spapr: Use appropriate getter for PC_DIMM_ADDR_PROP
pc-dimm: Drop @errp argument of pc_dimm_plug()
spapr: Simplify spapr_cpu_core_realize() and spapr_cpu_core_unrealize()
spapr: Make spapr_cpu_core_unrealize() idempotent
spapr: Drop spapr_delete_vcpu() unused argument
spapr: Unrealize vCPUs with qdev_unrealize()
spapr: Fix leak of CPU machine specific data
spapr: Move spapr_create_nvdimm_dr_connectors() to core machine code
hw/net: move allocation to the heap due to very large stack frame
ppc/spapr: re-assert IRQs during event-scan if there are pending
spapr: Clarify why DR connectors aren't user creatable
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
- add some more individual contributors
- include SDL2 in centos images
- skip checkpatch check when no commits found
- use random port for gdb reverse debugging
- make gitlab use it's own mirrors to clone
- fix detection of make -nqp
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Merge remote-tracking branch 'remotes/stsquad/tags/pull-testing-and-misc-271020-1' into staging
Testing and gitdm updates
- add some more individual contributors
- include SDL2 in centos images
- skip checkpatch check when no commits found
- use random port for gdb reverse debugging
- make gitlab use it's own mirrors to clone
- fix detection of make -nqp
# gpg: Signature made Tue 27 Oct 2020 09:55:55 GMT
# gpg: using RSA key 6685AE99E75167BCAFC8DF35FBD0DB095A9E2A44
# gpg: Good signature from "Alex Bennée (Master Work Key) <alex.bennee@linaro.org>" [full]
# Primary key fingerprint: 6685 AE99 E751 67BC AFC8 DF35 FBD0 DB09 5A9E 2A44
* remotes/stsquad/tags/pull-testing-and-misc-271020-1:
makefile: handle -n / -k / -q correctly
gitlab-ci: Clone from GitLab itself
tests/acceptance: pick a random gdb port for reverse debugging
scripts: fix error from checkpatch.pl when no commits are found
gitlab: skip checkpatch.pl checks if no commit delta on branch
tests/docker/dockerfiles/centos: Use SDL2 instead of SDL1
contrib/gitdm: Add more individual contributors
Adding ani's email as an individual contributor
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This reverts the following commits due to their basis on a bogus
linux kernel header update:
c93a656f7b ("tests/acceptance: Add virtiofs_submounts.py")
45ced7ca2f ("tests/acceptance/boot_linux: Accept SSH pubkey")
08dce386e7 ("virtiofsd: Announce sub-mount points")
eba8b096c1 ("virtiofsd: Store every lo_inode's parent_dev")
ede24b6be7 ("virtiofsd: Add fuse_reply_attr_with_flags()")
e2577435d3 ("virtiofsd: Add attr_flags to fuse_entry_param")
2f10415abf ("virtiofsd: Announce FUSE_ATTR_FLAGS")
97d741cc96 ("linux/fuse.h: Pull in from Linux")
Cc: Max Reitz <mreitz@redhat.com>
Cc: Stefan Hajnoczi <stefanha@redhat.com>
Cc: Dr. David Alan Gilbert <dgilbert@redhat.com>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Message-id: 160385090886.20017.13382256442750027666.stgit@gimli.home
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
CI jobs results:
. https://cirrus-ci.com/build/4879251751043072
. https://gitlab.com/philmd/qemu/-/pipelines/207661784
. https://travis-ci.org/github/philmd/qemu/builds/738958191
. https://app.shippable.com/github/philmd/qemu/runs/891/summary/console
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Merge remote-tracking branch 'remotes/philmd-gitlab/tags/led-api-20201026' into staging
API to model LED.
CI jobs results:
. https://cirrus-ci.com/build/4879251751043072
. https://gitlab.com/philmd/qemu/-/pipelines/207661784
. https://travis-ci.org/github/philmd/qemu/builds/738958191
. https://app.shippable.com/github/philmd/qemu/runs/891/summary/console
# gpg: Signature made Mon 26 Oct 2020 22:03:59 GMT
# gpg: using RSA key FAABE75E12917221DCFD6BB2E3E32C2CDEADC0DE
# gpg: Good signature from "Philippe Mathieu-Daudé (F4BUG) <f4bug@amsat.org>" [full]
# Primary key fingerprint: FAAB E75E 1291 7221 DCFD 6BB2 E3E3 2C2C DEAD C0DE
* remotes/philmd-gitlab/tags/led-api-20201026:
hw/arm/tosa: Replace fprintf() calls by LED devices
hw/misc/mps2-scc: Use the LED device
hw/misc/mps2-fpgaio: Use the LED device
hw/arm/aspeed: Add the 3 front LEDs drived by the PCA9552 #1
hw/misc/led: Emit a trace event when LED intensity has changed
hw/misc/led: Allow connecting from GPIO output
hw/misc/led: Add a LED device
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
There's no reason to keep this here; the versions described are
ancient. Everything here is still mirrored on
https://wiki.qemu.org/ChangeLog/old if anyone is curious; otherwise, use
the git history.
Signed-off-by: John Snow <jsnow@redhat.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20201026195131.13848-1-jsnow@redhat.com>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
This script has not seen a patch that was specifically for this script
since it was moved to this location in 2013, and I doubt it is used. It
uses "man qmp" for its help message, which does not exist. It also
presumes there is a manual page for qmp-XXX, for each defined qmp
command XXX. I don't think that's true.
The format it expects arguments in is something like:
block-dirty-bitmap-add --node=foo --name=bar
and has no capacity to support nested JSON arguments, either.
Most developers use either qmp-shell or socat (or pasting JSON directly
into qmp stdio), so this duplication and additional alternate syntax is
not helpful.
Remove it. Leave a breadcrumb script just in case, to be removed next
release cycle.
Signed-off-by: John Snow <jsnow@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Message-Id: <20201019210430.1063390-1-jsnow@redhat.com>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
There is no "version 2" of the "Lesser" General Public License.
It is either "GPL version 2.0" or "Lesser GPL version 2.1".
This patch replaces all occurrences of "Lesser GPL version 2" with
"Lesser GPL version 2.1" in comment section.
Signed-off-by: Chetan Pant <chetan4windows@gmail.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Message-Id: <20201014133722.14041-1-chetan4windows@gmail.com>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
There is no "version 2" of the "Lesser" General Public License.
It is either "GPL version 2.0" or "Lesser GPL version 2.1".
This patch replaces all occurrences of "Lesser GPL version 2" with
"Lesser GPL version 2.1" in comment section.
Signed-off-by: Chetan Pant <chetan4windows@gmail.com>
Acked-by: Daniel P. Berrangé <berrange@redhat.com>
Message-Id: <20201014134033.14095-1-chetan4windows@gmail.com>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
cpu_remove() got superseded by cpu_remove_sync() in commit dbadee4ff4,
but its prototype wasn't removed. We could possibly keep the shorter
cpu_remove() naming but it seems better to highligth that this blocks
until the CPU thread is joined.
Fixes: dbadee4ff4 ("cpus: join thread when removing a vCPU")
Cc: pbonzini@redhat.com
Signed-off-by: Greg Kurz <groug@kaod.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Message-Id: <160268285707.1107461.15035929822602623985.stgit@bahia.lan>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
The code base has some C source and header files that don't get indexed
because their name ends with .inc:
$ git ls-files "*.[ch].inc" | wc -l
66
Add them to the list.
Signed-off-by: Greg Kurz <groug@kaod.org>
Message-Id: <160258069310.900922.1495166540282536628.stgit@bahia.lan>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
The 'kdgb' is allocating memory in get_kdbg(), but it is not freed
in both fill_header() and fill_context() failed branches, fix it.
Signed-off-by: AlexChen <alex.chen@huawei.com>
Reviewed-by: Li Qiang <liq3ea@gmail.com>
Reviewed-by: Viktor Prutyanov <viktor.prutyanov@phystech.edu>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Message-Id: <5F463659.8080101@huawei.com>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
The SRST protocol states that after diagnostics are complete and the
status is posted, we should clear the SRST bit if it should so happen to
be set.
The reset method itself should handle this, but just in case -- make our
intention explicit here.
Signed-off-by: John Snow <jsnow@redhat.com>
Tested-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Message-id: 20201020200242.1497705-4-jsnow@redhat.com
Signed-off-by: John Snow <jsnow@redhat.com>
We don't need to wait for the falling edge. We can set BSY as
soon as possible and begin immediately resetting the drive. Devices
don't appear to need to take any specific action on the falling edge.
Signed-off-by: John Snow <jsnow@redhat.com>
Tested-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Message-id: 20201020200242.1497705-3-jsnow@redhat.com
Signed-off-by: John Snow <jsnow@redhat.com>
Software reset (SRST) should cause the diagnostic command to be run. Make an
explicit call to that routine.
Reported-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Tested-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Signed-off-by: John Snow <jsnow@redhat.com>
Message-id: 20201020200242.1497705-2-jsnow@redhat.com
Fixes: 55adb3c456
Fixes: https://bugs.launchpad.net/bugs/1900155
Tested-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Signed-off-by: John Snow <jsnow@redhat.com>
Misono
Set default log level to info
Explicit build option for virtiofsd
Me
xattr name mapping
Stefan
Alternative chroot sandbox method
Max
Submount mechanism
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
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Merge remote-tracking branch 'remotes/dgilbert-gitlab/tags/pull-virtiofs-20201026' into staging
virtiofsd pull 2020-10-26
Misono
Set default log level to info
Explicit build option for virtiofsd
Me
xattr name mapping
Stefan
Alternative chroot sandbox method
Max
Submount mechanism
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
# gpg: Signature made Mon 26 Oct 2020 18:41:36 GMT
# gpg: using RSA key 45F5C71B4A0CB7FB977A9FA90516331EBC5BFDE7
# gpg: Good signature from "Dr. David Alan Gilbert (RH2) <dgilbert@redhat.com>" [full]
# Primary key fingerprint: 45F5 C71B 4A0C B7FB 977A 9FA9 0516 331E BC5B FDE7
* remotes/dgilbert-gitlab/tags/pull-virtiofs-20201026:
tests/acceptance: Add virtiofs_submounts.py
tests/acceptance/boot_linux: Accept SSH pubkey
virtiofsd: Announce sub-mount points
virtiofsd: Store every lo_inode's parent_dev
virtiofsd: Add fuse_reply_attr_with_flags()
virtiofsd: Add attr_flags to fuse_entry_param
virtiofsd: Announce FUSE_ATTR_FLAGS
linux/fuse.h: Pull in from Linux
tools/virtiofsd: xattr name mappings: Simple 'map'
tools/virtiofsd: xattr name mapping examples
tools/virtiofsd: xattr name mappings: Map server xattr names
tools/virtiofsd: xattr name mappings: Map client xattr names
tools/virtiofsd: xattr name mappings: Add option
virtiofsd: add container-friendly -o sandbox=chroot option
virtiofsd: passthrough_ll: set FUSE_LOG_INFO as default log_level
configure: add option for virtiofsd
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
If a BDS gets deleted during blk_drain_all(), it might miss a
call to bdrv_do_drained_end(). This means missing a call to
aio_enable_external() and the AIO context remains disabled for
ever. This can cause a device to become irresponsive and to
disrupt the guest execution, ie. hang, loop forever or worse.
This scenario is quite easy to encounter with virtio-scsi
on POWER when punching multiple blockdev-create QMP commands
while the guest is booting and it is still running the SLOF
firmware. This happens because SLOF disables/re-enables PCI
devices multiple times via IO/MEM/MASTER bits of PCI_COMMAND
register after the initial probe/feature negotiation, as it
tends to work with a single device at a time at various stages
like probing and running block/network bootloaders without
doing a full reset in-between. This naturally generates many
dataplane stops and starts, and thus many drain sections that
can race with blockdev_create_run(). In the end, SLOF bails
out.
It is somehow reproducible on x86 but it requires to generate
articial dataplane start/stop activity with stop/cont QMP
commands. In this case, seabios ends up looping for ever,
waiting for the virtio-scsi device to send a response to
a command it never received.
Add a helper that pairs all previously called bdrv_do_drained_begin()
with a bdrv_do_drained_end() and call it from bdrv_close().
While at it, update the "/bdrv-drain/graph-change/drain_all"
test in test-bdrv-drain so that it can catch the issue.
BugId: https://bugzilla.redhat.com/show_bug.cgi?id=1874441
Signed-off-by: Greg Kurz <groug@kaod.org>
Message-Id: <160346526998.272601.9045392804399803158.stgit@bahia.lan>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Since commit c8bb23cbdb when a write
request results in a new allocation QEMU first tries to see if the
rest of the cluster outside the written area contains only zeroes.
In that case, instead of doing a normal copy-on-write operation and
writing explicit zero buffers to disk, the code zeroes the whole
cluster efficiently using pwrite_zeroes() with BDRV_REQ_NO_FALLBACK.
This improves performance very significantly but it only happens when
we are writing to an area that was completely unallocated before. Zero
clusters (QCOW2_CLUSTER_ZERO_*) are treated like normal clusters and
are therefore slower to allocate.
This happens because the code uses bdrv_is_allocated_above() rather
bdrv_block_status_above(). The former is not as accurate for this
purpose but it is faster. However in the case of qcow2 the underlying
call does already report zero clusters just fine so there is no reason
why we cannot use that information.
After testing 4KB writes on an image that only contains zero clusters
this patch results in almost five times more IOPS.
Signed-off-by: Alberto Garcia <berto@igalia.com>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Message-Id: <6d77cab968c501c44d6e1089b9bc91b04170b49e.1603731354.git.berto@igalia.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
If a BlockDriverState supports backing files but has none then any
unallocated area reads back as zeroes.
bdrv_co_block_status() is only reporting this is if want_zero is true,
but this is an inexpensive test and there is no reason not to do it in
all cases.
Suggested-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Signed-off-by: Alberto Garcia <berto@igalia.com>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Message-Id: <66fa0914a0e2b727ab6d1b63ca773d7cd29a9a9e.1603731354.git.berto@igalia.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
add support for rate limit in qemu-img convert.
Signed-off-by: Zhengui <lizhengui@huawei.com>
Message-Id: <1603205264-17424-3-git-send-email-lizhengui@huawei.com>
Reviewed-by: Alberto Garcia <berto@igalia.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
add support for rate limit in qemu-img commit.
Signed-off-by: Zhengui <lizhengui@huawei.com>
Message-Id: <1603205264-17424-2-git-send-email-lizhengui@huawei.com>
Reviewed-by: Alberto Garcia <berto@igalia.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
I found that there are many spelling errors in the comments of qemu/target/ppc.
I used spellcheck to check the spelling errors and found some errors in the folder.
Signed-off-by: zhaolichang <zhaolichang@huawei.com>
Reviewed-by: David Edmondson <david.edmondson@oracle.com>
Message-Id: <20201009064449.2336-3-zhaolichang@huawei.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: Greg Kurz <groug@kaod.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
spapr_reallocate_hpt() has three users, two of which pass &error_fatal
and the third one, htab_load(), passes &local_err, uses it to detect
failures and simply propagates -EINVAL up to vmstate_load(), which will
cause QEMU to exit. It is thus confusing that spapr_reallocate_hpt()
doesn't return right away when an error is detected in some cases. Also,
the comment suggesting that the caller is welcome to try to carry on
seems like a remnant in this respect.
This can be improved:
- change spapr_reallocate_hpt() to always report a negative errno on
failure, either as reported by KVM or -ENOSPC if the HPT is smaller
than what was asked,
- use that to detect failures in htab_load() which is preferred over
checking &local_err,
- propagate this negative errno to vmstate_load() because it is more
accurate than propagating -EINVAL for all possible errors.
[dwg: Fix compile error due to omitted prelim patch]
Signed-off-by: Greg Kurz <groug@kaod.org>
Message-Id: <160371605460.305923.5890143959901241157.stgit@bahia.lan>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
If kvmppc_load_htab_chunk() fails, its return value is propagated up
to vmstate_load(). It should thus be a negative errno, not -1 (which
maps to EPERM and would lure the user into thinking that the problem
is necessarily related to a lack of privilege).
Return the error reported by KVM or ENOSPC in case of short write.
While here, propagate the error message through an @errp argument
and have the caller to print it with error_report_err() instead
of relying on fprintf().
Signed-off-by: Greg Kurz <groug@kaod.org>
Message-Id: <160371604713.305923.5264900354159029580.stgit@bahia.lan>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Hints should be added with the dedicated error_append_hint() API
because we don't want to print them when using QMP. This requires
to insert ERRP_GUARD as explained in "qapi/error.h".
Signed-off-by: Greg Kurz <groug@kaod.org>
Message-Id: <160371604030.305923.17464161378167312662.stgit@bahia.lan>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
As recommended in "qapi/error.h", add a bool return value to
spapr_add_lmbs() and spapr_add_nvdimm(), and use them instead
of local_err in spapr_memory_plug().
This allows to get rid of the error propagation overhead.
Signed-off-by: Greg Kurz <groug@kaod.org>
Message-Id: <160309734178.2739814.3488437759887793902.stgit@bahia.lan>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Both PC_DIMM_SLOT_PROP and PC_DIMM_ADDR_PROP are defined in the
default property list of the PC DIMM device class:
DEFINE_PROP_UINT64(PC_DIMM_ADDR_PROP, PCDIMMDevice, addr, 0),
DEFINE_PROP_INT32(PC_DIMM_SLOT_PROP, PCDIMMDevice, slot,
PC_DIMM_UNASSIGNED_SLOT),
They should thus be always gettable for both PC DIMMs and NVDIMMs.
An error in getting them can only be the result of a programming
error. It doesn't make much sense to propagate the error in this
case. Abort instead.
Signed-off-by: Greg Kurz <groug@kaod.org>
Message-Id: <160309732180.2739814.7243774674998010907.stgit@bahia.lan>
Reviewed-by: Igor Mammedov <imammedo@redhat.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
The PC_DIMM_SLOT_PROP property is defined as:
DEFINE_PROP_INT32(PC_DIMM_SLOT_PROP, PCDIMMDevice, slot,
PC_DIMM_UNASSIGNED_SLOT),
Use object_property_get_int() instead of object_property_get_uint().
Since spapr_memory_plug() only gets called if pc_dimm_pre_plug()
succeeded, we expect to have a valid >= 0 slot number, either because
the user passed a valid slot number or because pc_dimm_get_free_slot()
picked one up for us.
Signed-off-by: Greg Kurz <groug@kaod.org>
Message-Id: <160309730758.2739814.15821922745424652642.stgit@bahia.lan>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
The PC_DIMM_ADDR_PROP property is defined as:
DEFINE_PROP_UINT64(PC_DIMM_ADDR_PROP, PCDIMMDevice, addr, 0),
Use object_property_get_uint() instead of object_property_get_int().
Signed-off-by: Greg Kurz <groug@kaod.org>
Message-Id: <160309729609.2739814.4996614957953215591.stgit@bahia.lan>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
pc_dimm_plug() doesn't use it. It only aborts on error.
Drop @errp and adapt the callers accordingly.
[dwg: Removed unused label to fix compile]
Signed-off-by: Greg Kurz <groug@kaod.org>
Message-Id: <160309728447.2739814.12831204841251148202.stgit@bahia.lan>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Igor Mammedov <imammedo@redhat.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Now that the error path of spapr_cpu_core_realize() is just to call
idempotent spapr_cpu_core_unrealize() for rollback, no need to create
and realize the vCPUs in two separate loops.
Merge them and do them same in spapr_cpu_core_unrealize() for symmetry.
Signed-off-by: Greg Kurz <groug@kaod.org>
Message-Id: <160279673321.1808373.2248221100790367912.stgit@bahia.lan>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
