We are currently facing some migration failure on s390x when running
certain avocado-vt tests, e.g. when running the test
type_specific.io-github-autotest-qemu.migrate.with_reboot.exec.gzip_exec.
This test is using 'migrate -d "exec:nc localhost 5200"' for the migration.
The problem is detected at the receiving side, where the migration stream
apparently ends too early. However, the cause for the problem is at the
sending side: After writing the migration stream into the pipe to netcat,
the source QEMU calls qio_channel_command_close() which closes the pipe
and immediately (!) kills the child process afterwards (via the function
qio_channel_command_abort()). So if the sending netcat did not read the
final bytes from the pipe yet, or if it did not manage to send out all
its buffers yet, it is killed before the whole migration stream is passed
to the destination side.
QEMU can not know how much time is required by the child process to send
over all migration data, so we should not kill it, neither directly nor
after a delay. Let's simply wait for the child process to exit gracefully
instead (this was also the behaviour of pclose() that was used in "exec:"
migration before the QIOChannel rework).
Signed-off-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
Add /dev/fdset/ support to QIOChannelFile by calling qemu_open() instead
of open() and qemu_close() instead of close(). There is a subtle
semantic change since qemu_open() automatically sets O_CLOEXEC, but this
doesn't affect any of the users of the function.
Signed-off-by: Ross Lagerwall <ross.lagerwall@citrix.com>
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
If the file descriptor underlying QIOChannelFile is closed in the
io_close() method, don't close it again in the finalize() method since
the file descriptor number may have been reused in the meantime.
Signed-off-by: Ross Lagerwall <ross.lagerwall@citrix.com>
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
The code wrongly passes the mode to open() only if O_WRONLY is set.
Instead, the mode should be passed when O_CREAT is set (or O_TMPFILE on
Linux). Fix this by always passing the mode since open() will correctly
ignore the mode if it is not needed. Add a testcase which exercises this
bug and also change the existing testcase to check that the mode of the
created file is correct.
Signed-off-by: Ross Lagerwall <ross.lagerwall@citrix.com>
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
According to the current implementation of websocket protocol in QEMU,
qio_channel_websock_handshake_io tries to read handshake from the
channel to start communication over socket. But this approach
doesn't cover scenario when socket was closed while handshaking.
Therefore, if G_IO_IN is caught and qio_channel_read returns zero,
error has to be set and connection has to be done.
Such behaviour causes 100% CPU load in main QEMU loop, because main loop
poll continues to receive and handle G_IO_IN events from websocket.
Step to reproduce 100% CPU load:
1) start qemu with the simplest configuration
$ qemu -vnc [::1]:1,websocket=7500
2) open any vnc listener (which doesn't follow websocket
protocol)
$ vncviewer :7500
3) kill listener
4) qemu main thread eats 100% CPU
Signed-off-by: Edgar Kaziakhmedov <edgar.kaziakhmedov@virtuozzo.com>
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
The sources array does not escape out of qio_net_listener_wait_client, so
we have to free it.
Reported by Coverity.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
- Clean-ups by Eric Blake with regards to the global_qtest variable
- Some more test cases for the boot-serial tester
- Re-activation of the m48t59-test
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Merge remote-tracking branch 'remotes/huth/tags/pull-request-2018-02-14' into staging
Various improvements to the qtest checks:
- Clean-ups by Eric Blake with regards to the global_qtest variable
- Some more test cases for the boot-serial tester
- Re-activation of the m48t59-test
# gpg: Signature made Wed 14 Feb 2018 11:07:44 GMT
# gpg: using RSA key 2ED9D774FE702DB5
# gpg: Good signature from "Thomas Huth <th.huth@gmx.de>"
# gpg: aka "Thomas Huth <thuth@redhat.com>"
# gpg: aka "Thomas Huth <huth@tuxfamily.org>"
# gpg: aka "Thomas Huth <th.huth@posteo.de>"
# Primary key fingerprint: 27B8 8847 EEE0 2501 18F3 EAB9 2ED9 D774 FE70 2DB5
* remotes/huth/tags/pull-request-2018-02-14:
tests/m48t59: Use the m48t59 test on ppc, too
tests/Makefile: Derive check-qtest-ppc64-y from check-qtest-ppc-y
tests/m48t59: Make the test independent of global_qtest
tests/m48t59: Fix and re-enable the test for sparc
tests/boot-serial-test: Add support for the aarch64 virt machine
tests/boot-serial: Add tests for PowerPC Mac machines
tests/boot-serial: Enable the boot-serial test on SPARC machines, too
wdt_ib700-test: Drop dependence on global_qtest
tests/boot-sector: Drop dependence on global_qtest
qmp-test: Drop dependence on global_qtest
libqos: Use explicit QTestState for remaining libqos operations
libqos: Use explicit QTestState for ahci operations
libqos: Use explicit QTestState for i2c operations
libqos: Use explicit QTestState for rtas operations
libqos: Use explicit QTestState for fw_cfg operations
libqos: Track QTestState with QPCIBus
libqtest: Use qemu_strtoul()
tests: Clean up wait for event
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
The ref405ep machine has a memory-mapped m48t59 device, so
we can run the m48t59 test on this machine, too.
Signed-off-by: Thomas Huth <thuth@redhat.com>
Stop using the functions that require global_qtest here and pass
around the QTestState instead (global_qtest should finally get
removed since this causes problems with tests running in parallel).
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
The m48t59 test has been disabled in commit baeddded5f
("sparc: disable qtest in make check"), likely due to some timing issues
in the bcd_check_time tests which might fail if it gets interrupted for
too long. It should be OK to re-enable this test if we make sure that we
do not run it on timing-sensitive machines, thus it should be OK if we only
run it in the g_test_slow() mode.
Additionally, there are two other issues:
First, the test can not run so easily on sparc64 anymore, since commit
f3b18f35a2 ("sun4u: switch m48t59 NVRAM to MMIO access")
moved the m48t59 device to the ebus instead, and for this you first
have to set up the corresponding PCI device (which is currently not
possible from within the m48t59 test). So we can only re-enable this
test on sparc, but not the sparc64 target.
Second, the fuzzing test is executed before the bcd-check-time test
(due to the naming of the tests), without having the base address set
up properly, so the fuzzing test does not really check anything at all.
Fix it by setting up the base address from the main function already
and by moving the qtest_start() to the tests themselves, so that each
test starts with a clean environment (since after the fuzzing, the clock
is unusable for the bcd-check-time test).
Signed-off-by: Thomas Huth <thuth@redhat.com>
This patch adds a small binary kernel to test aarch64 virt machine's
UART.
Signed-off-by: Wei Huang <wei@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
[thuth: Fixed contextual conflicts with the hppa and sdhci patches]
Signed-off-by: Thomas Huth <thuth@redhat.com>
OpenBIOS prints out the CPU type on these machine types, so we can use
this string to test whether the CPU detection is working correctly.
Acked-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
OpenBIOS prints out the name of the detected CPU here, so looking for
this string is a nice test to verify that the CPU detection is still
working correctly.
Acked-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
As a general rule, we prefer avoiding implicit global state
because it makes code harder to safely copy and paste without
thinking about the global state. Improve this test to be
explicit about the state.
Signed-off-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
As a general rule, we prefer avoiding implicit global state
because it makes code harder to safely copy and paste without
thinking about the global state. Adjust the helper code to
use explicit state instead, and update all callers.
Fix some trailing whitespace while touching the file.
Signed-off-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
As a general rule, we prefer avoiding implicit global state
because it makes code harder to safely copy and paste without
thinking about the global state. Although qmp-test does not
maintain parallel qtest connections, it was the last test
assigning to global_qtest. It's just as easy to be explicit
about the state; once all tests have been cleaned up, a later
patch can then get rid of global_qtest and a layer of wrappers
in libqtest.
Signed-off-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
Drop one more client of global_qtest by teaching all remaining
libqos stragglers to pass in an explicit QTestState. Change the
setting of global_qtest from being implicit in libqos' call to
qtest_start() to instead be explicit in all clients that are
still relying on global_qtest.
Note that qmp_execute() can be greatly simplified in the process,
and that we also get rid of interpolation of a JSON string into a
temporary variable when qtest_qmp() can do it more reliably.
Signed-off-by: Eric Blake <eblake@redhat.com>
Acked-by: Greg Kurz <groug@kaod.org>
Reviewed-by: John Snow <jsnow@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
Drop one more client of global_qtest by teaching all ahci test
functionality to pass in an explicit QTestState. The state was
already available, so no callers had to be adjusted.
Signed-off-by: Eric Blake <eblake@redhat.com>
Reviewed-by: John Snow <jsnow@redhat.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
Drop one more client of global_qtest by teaching all i2c test
functionality to pass in an explicit QTestState, adjusting all
callers.
Signed-off-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
Drop one more client of global_qtest by teaching all rtas test
functionality to pass in an explicit QTestState, adjusting all
callers.
Signed-off-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
[thuth: Use nicer indentation in rtas.h]
Signed-off-by: Thomas Huth <thuth@redhat.com>
Drop one more client of global_qtest by teaching all fw_cfg test
functionality (invoked through alloc-pc) to pass in an explicit
QTestState, adjusting all callers. In particular, fw_cfg-test
had to reorder things to create the test state prior to creating
the fw_cfg (and drop a pointless strdup in the meantime), but that
test now no longer depends on global_qtest.
Signed-off-by: Eric Blake <eblake@redhat.com>
Reviewed-by: John Snow <jsnow@redhat.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
[thuth: Fixed conflict wrt pc_alloc_init() in vhost-user-test.c]
Signed-off-by: Thomas Huth <thuth@redhat.com>
When initializing a QPCIBus, track which QTestState the bus is
associated with (so that a later patch can then explicitly use
that test state for all communication on the bus, rather than
blindly relying on global_qtest). Update the initialization
functions to take another parameter, and update all callers to
pass in state (for now, most callers get away with passing the
current global_qtest as the current state, although this required
fixing the order of initialization to ensure qtest_start() is
called before qpci_init*() in rtl8139-test, and provided an
opportunity to pass in the allocator in e1000e-test).
Touch up some allocations to use g_new0() rather than g_malloc()
while in the area, and simplify some code (all implementations
of QOSOps provide a .init_allocator() that never fails).
Signed-off-by: Eric Blake <eblake@redhat.com>
Reviewed-by: John Snow <jsnow@redhat.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
[thuth: Removed hunk from vhost-user-test.c that is not required anymore,
fixed conflict in qtest_vboot() and adjusted qpci_init_pc() in sdhci-test]
Signed-off-by: Thomas Huth <thuth@redhat.com>
This patch implements movep instruction. It moves data between a data register
and alternate bytes within the address space starting at the location
specified and incrementing by two.
It was designed for the original 68000 and used in firmwares for
interfacing the 8-bit peripherals through the 16-bit data bus.
Without this patch opcode for this instruction is recognized as some bitop.
Signed-off-by: Pavel Dovgalyuk <pavel.dovgaluk@ispras.ru>
Signed-off-by: Mihail Abakumov <mikhail.abakumov@ispras.ru>
Tested-by: Laurent Vivier <laurent@vivier.eu>
Reviewed-by: Laurent Vivier <laurent@vivier.eu>
Message-Id: <20180206124431.31433.91946.stgit@pasha-VirtualBox>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
This will keep checkpatch happy when the next patch does code motion.
Fix the include order to match HACKING when adding the needed header.
Signed-off-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>
We still use hacks like qmp("") to wait for an event, even though we
have qmp_eventwait() since commit 8fe941f, and qmp_eventwait_ref()
since commit 7ffe312. Both commits neglected to convert all the
existing hacks. Make up what they missed.
Bonus: gets rid of empty format strings. A step towards compile-time
format string checking without triggering -Wformat-zero-length.
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Eric Blake <eblake@redhat.com>
[thuth: dropped the hunks from the usb tests - not needed anymore]
Signed-off-by: Thomas Huth <thuth@redhat.com>
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Merge remote-tracking branch 'remotes/kevin/tags/for-upstream' into staging
Block layer patches
# gpg: Signature made Tue 13 Feb 2018 17:03:11 GMT
# gpg: using RSA key 7F09B272C88F2FD6
# gpg: Good signature from "Kevin Wolf <kwolf@redhat.com>"
# Primary key fingerprint: DC3D EB15 9A9A F95D 3D74 56FE 7F09 B272 C88F 2FD6
* remotes/kevin/tags/for-upstream: (55 commits)
iotests: Add l2-cache-entry-size to iotest 137
iotests: Test downgrading an image using a small L2 slice size
iotests: Test valid values of l2-cache-entry-size
qcow2: Allow configuring the L2 slice size
qcow2: Rename l2_table in count_cow_clusters()
qcow2: Rename l2_table in count_contiguous_clusters_unallocated()
qcow2: Rename l2_table in count_contiguous_clusters()
qcow2: Rename l2_table in qcow2_alloc_compressed_cluster_offset()
qcow2: Update qcow2_truncate() to support L2 slices
qcow2: Update expand_zero_clusters_in_l1() to support L2 slices
qcow2: Prepare expand_zero_clusters_in_l1() for adding L2 slice support
qcow2: Read refcount before L2 table in expand_zero_clusters_in_l1()
qcow2: Update qcow2_update_snapshot_refcount() to support L2 slices
qcow2: Prepare qcow2_update_snapshot_refcount() for adding L2 slice support
qcow2: Update zero_single_l2() to support L2 slices
qcow2: Update discard_single_l2() to support L2 slices
qcow2: Update handle_alloc() to support L2 slices
qcow2: Update handle_copied() to support L2 slices
qcow2: Update qcow2_alloc_cluster_link_l2() to support L2 slices
qcow2: Update qcow2_get_cluster_offset() to support L2 slices
...
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
- new stats in virtio balloon
- virtio eventfd rework for boot speedup
- vhost memory rework for boot speedup
- fixes and cleanups all over the place
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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Merge remote-tracking branch 'remotes/mst/tags/for_upstream' into staging
virtio,vhost,pci,pc: features, fixes and cleanups
- new stats in virtio balloon
- virtio eventfd rework for boot speedup
- vhost memory rework for boot speedup
- fixes and cleanups all over the place
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
# gpg: Signature made Tue 13 Feb 2018 16:29:55 GMT
# gpg: using RSA key 281F0DB8D28D5469
# gpg: Good signature from "Michael S. Tsirkin <mst@kernel.org>"
# gpg: aka "Michael S. Tsirkin <mst@redhat.com>"
# Primary key fingerprint: 0270 606B 6F3C DF3D 0B17 0970 C350 3912 AFBE 8E67
# Subkey fingerprint: 5D09 FD08 71C8 F85B 94CA 8A0D 281F 0DB8 D28D 5469
* remotes/mst/tags/for_upstream: (22 commits)
virtio-balloon: include statistics of disk/file caches
acpi-test: update FADT
lpc: drop pcie host dependency
tests: acpi: fix FADT not being compared to reference table
hw/pci-bridge: fix pcie root port's IO hints capability
libvhost-user: Support across-memory-boundary access
libvhost-user: Fix resource leak
virtio-balloon: unref the memory region before continuing
pci: removed the is_express field since a uniform interface was inserted
virtio-blk: enable multiple vectors when using multiple I/O queues
pci/bus: let it has higher migration priority
pci-bridge/i82801b11: clear bridge registers on platform reset
vhost: Move log_dirty check
vhost: Merge and delete unused callbacks
vhost: Clean out old vhost_set_memory and friends
vhost: Regenerate region list from changed sections list
vhost: Merge sections added to temporary list
vhost: Simplify ring verification checks
vhost: Build temporary section list and deref after commit
virtio: improve virtio devices initialization time
...
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Tomáš Golembiovský <tgolembi@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Previous commit ("tests: acpi: fix FADT not being compared to reference table")
started tracking changes to the FADT. Generate the expected FACP files -
apparently these weren't updated since 2013.
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
It turns out that FADT isn't actually tested for changes
against reference table, since it happens to be the 1st
table in RSDT which is currently ignored.
Fix it by making sure that all tables from RSDT are added
to test list.
NOTE: FADT contains guest allocated pointers to FACS/DSDT,
zero them out so that possible FACS/DSDT address change
won't affect test results.
Signed-off-by: Igor Mammedov <imammedo@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
The gen_pcie_root_port mem-reserve and pref32-reserve properties are
defined as size (so uint64_t), but passed as uint32_t when building
the 'IO hints' vendor specific capability.
Passing 4G (or more) gets truncated and passed as a zero reservation.
Is not a huge issue since the guest firmware will always compare the
hints with the default value and take the maximum.
Fix it by passing the values as uint64_t and failing to init the
gen_pcie_root_port id invalid values are used.
Signed-off-by: Marcel Apfelbaum <marcel@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
The sg list/indirect descriptor table may be contigious
in GPA but not in HVA address space. But libvhost-user
wasn't aware of that. This would cause out-of-bounds
access. Even a malicious guest could use it to get
information from the vhost-user backend.
Introduce a plen parameter in vu_gpa_to_va() so we can
handle this case, returning the actual mapped length.
Signed-off-by: Yongji Xie <xieyongji@baidu.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Maxime Coquelin <maxime.coquelin@redhat.com>
Free the mmaped memory when we need to mmap new memory
space on vu_set_mem_table_exec() and vu_set_log_base_exec() to
avoid memory leak.
Also close the corresponding fd after mmap() on
vu_set_log_base_exec() to avoid fd leak.
Signed-off-by: Yongji Xie <xieyongji@baidu.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Signed-off-by: Tiwei Bie <tiwei.bie@intel.com>
Cc: qemu-stable@nongnu.org
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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Merge remote-tracking branch 'mreitz/tags/pull-block-2018-02-13' into queue-block
Block patches for the block queue
# gpg: Signature made Tue Feb 13 17:00:13 2018 CET
# gpg: using RSA key F407DB0061D5CF40
# gpg: Good signature from "Max Reitz <mreitz@redhat.com>"
# Primary key fingerprint: 91BE B60A 30DB 3E88 57D1 1829 F407 DB00 61D5 CF40
* mreitz/tags/pull-block-2018-02-13: (40 commits)
iotests: Add l2-cache-entry-size to iotest 137
iotests: Test downgrading an image using a small L2 slice size
iotests: Test valid values of l2-cache-entry-size
qcow2: Allow configuring the L2 slice size
qcow2: Rename l2_table in count_cow_clusters()
qcow2: Rename l2_table in count_contiguous_clusters_unallocated()
qcow2: Rename l2_table in count_contiguous_clusters()
qcow2: Rename l2_table in qcow2_alloc_compressed_cluster_offset()
qcow2: Update qcow2_truncate() to support L2 slices
qcow2: Update expand_zero_clusters_in_l1() to support L2 slices
qcow2: Prepare expand_zero_clusters_in_l1() for adding L2 slice support
qcow2: Read refcount before L2 table in expand_zero_clusters_in_l1()
qcow2: Update qcow2_update_snapshot_refcount() to support L2 slices
qcow2: Prepare qcow2_update_snapshot_refcount() for adding L2 slice support
qcow2: Update zero_single_l2() to support L2 slices
qcow2: Update discard_single_l2() to support L2 slices
qcow2: Update handle_alloc() to support L2 slices
qcow2: Update handle_copied() to support L2 slices
qcow2: Update qcow2_alloc_cluster_link_l2() to support L2 slices
qcow2: Update qcow2_get_cluster_offset() to support L2 slices
...
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This test tries reopening a qcow2 image with valid and invalid
options. This patch adds l2-cache-entry-size to the set.
Signed-off-by: Alberto Garcia <berto@igalia.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Message-id: 3d3b7d2dbfc020deaef60fb58739b0801eb9517c.1517840877.git.berto@igalia.com
Signed-off-by: Max Reitz <mreitz@redhat.com>
expand_zero_clusters_in_l1() is used when downgrading qcow2 images
from v3 to v2 (compat=0.10). This is one of the functions that needed
more changes to support L2 slices, so this patch extends iotest 061 to
test downgrading a qcow2 image using a smaller slice size.
Signed-off-by: Alberto Garcia <berto@igalia.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Message-id: 3e5662dce5e4926c8fabbad4c0b9142b2a506dd4.1517840877.git.berto@igalia.com
Signed-off-by: Max Reitz <mreitz@redhat.com>
The l2-cache-entry-size setting can only contain values that are
powers of two between 512 and the cluster size.
Signed-off-by: Alberto Garcia <berto@igalia.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Message-id: bd3547b670b8d0af11480c760991a22bcae5b48c.1517840877.git.berto@igalia.com
[mreitz: Changed non-power-of-two test value from 300 to 4242]
Signed-off-by: Max Reitz <mreitz@redhat.com>
Now that the code is ready to handle L2 slices we can finally add an
option to allow configuring their size.
An L2 slice is the portion of an L2 table that is read by the qcow2
cache. Until now the cache was always reading full L2 tables, and
since the L2 table size is equal to the cluster size this was not very
efficient with large clusters. Here's a more detailed explanation of
why it makes sense to have smaller cache entries in order to load L2
data:
https://lists.gnu.org/archive/html/qemu-block/2017-09/msg00635.html
This patch introduces a new command-line option to the qcow2 driver
named l2-cache-entry-size (cf. l2-cache-size). The cache entry size
has the same restrictions as the cluster size: it must be a power of
two and it has the same range of allowed values, with the additional
requirement that it must not be larger than the cluster size.
The L2 cache entry size (L2 slice size) remains equal to the cluster
size for now by default, so this feature must be explicitly enabled.
Although my tests show that 4KB slices consistently improve
performance and give the best results, let's wait and make more tests
with different cluster sizes before deciding on an optimal default.
Now that the cache entry size is not necessarily equal to the cluster
size we need to reflect that in the MIN_L2_CACHE_SIZE documentation.
That minimum value is a requirement of the COW algorithm: we need to
read two L2 slices (and not two L2 tables) in order to do COW, see
l2_allocate() for the actual code.
Signed-off-by: Alberto Garcia <berto@igalia.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Message-id: c73e5611ff4a9ec5d20de68a6c289553a13d2354.1517840877.git.berto@igalia.com
Signed-off-by: Max Reitz <mreitz@redhat.com>
This function doesn't need any changes to support L2 slices, but since
it's now dealing with slices intead of full tables, the l2_table
variable is renamed for clarity.
Signed-off-by: Alberto Garcia <berto@igalia.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Message-id: 6107001fc79e6739242f1de7d191375e4f130aac.1517840877.git.berto@igalia.com
Signed-off-by: Max Reitz <mreitz@redhat.com>
This function doesn't need any changes to support L2 slices, but since
it's now dealing with slices instead of full tables, the l2_table
variable is renamed for clarity.
Signed-off-by: Alberto Garcia <berto@igalia.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Message-id: 78bcc54bc632574dd0b900a77a00a1b6ffc359e6.1517840877.git.berto@igalia.com
Signed-off-by: Max Reitz <mreitz@redhat.com>
This function doesn't need any changes to support L2 slices, but since
it's now dealing with slices intead of full tables, the l2_table
variable is renamed for clarity.
Signed-off-by: Alberto Garcia <berto@igalia.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Message-id: 812b0c3505bb1687e51285dccf1a94f0cecb1f74.1517840877.git.berto@igalia.com
Signed-off-by: Max Reitz <mreitz@redhat.com>
This function doesn't need any changes to support L2 slices, but since
it's now dealing with slices instead of full tables, the l2_table
variable is renamed for clarity.
Signed-off-by: Alberto Garcia <berto@igalia.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Message-id: 0c5d4b9bf163aa3b49ec19cc512a50d83563f2ad.1517840877.git.berto@igalia.com
Signed-off-by: Max Reitz <mreitz@redhat.com>
The qcow2_truncate() code is mostly independent from whether
we're using L2 slices or full L2 tables, but in full and
falloc preallocation modes new L2 tables are allocated using
qcow2_alloc_cluster_link_l2(). Therefore the code needs to be
modified to ensure that all nb_clusters that are processed in each
call can be allocated with just one L2 slice.
Signed-off-by: Alberto Garcia <berto@igalia.com>
Message-id: 1fd7d272b5e7b66254a090b74cf2bed1cc334c0e.1517840877.git.berto@igalia.com
Reviewed-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Max Reitz <mreitz@redhat.com>
expand_zero_clusters_in_l1() expands zero clusters as a necessary step
to downgrade qcow2 images to a version that doesn't support metadata
zero clusters. This function takes an L1 table (which may or may not
be active) and iterates over all its L2 tables looking for zero
clusters.
Since we'll be loading L2 slices instead of full tables we need to add
an extra loop that iterates over all slices of each L2 table, and we
should also use the slice size when allocating the buffer used when
the L1 table is not active.
This function doesn't need any additional changes so apart from that
this patch simply updates the variable name from l2_table to l2_slice.
Finally, and since we have to touch the bdrv_read() / bdrv_write()
calls anyway, this patch takes the opportunity to replace them with
the byte-based bdrv_pread() / bdrv_pwrite().
Signed-off-by: Alberto Garcia <berto@igalia.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Message-id: 43590976f730501688096cff103f2923b72b0f32.1517840877.git.berto@igalia.com
Signed-off-by: Max Reitz <mreitz@redhat.com>
Adding support for L2 slices to expand_zero_clusters_in_l1() needs
(among other things) an extra loop that iterates over all slices of
each L2 table.
Putting all changes in one patch would make it hard to read because
all semantic changes would be mixed with pure indentation changes.
To make things easier this patch simply creates a new block and
changes the indentation of all lines of code inside it. Thus, all
modifications in this patch are cosmetic. There are no semantic
changes and no variables are renamed yet. The next patch will take
care of that.
Signed-off-by: Alberto Garcia <berto@igalia.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Message-id: c2ae9f31ed5b6e591477ad4654448badd1c89d73.1517840877.git.berto@igalia.com
Signed-off-by: Max Reitz <mreitz@redhat.com>
