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Emilio G. Cota 7266ae91a1 qht: do not segfault when gathering stats from an uninitialized qht 
So far, QHT functions assume that the passed qht has previously been
initialized--otherwise they segfault.

This patch makes an exception for qht_statistics_init, with the goal
of simplifying calling code. For instance, qht_statistics_init is
called from the 'info jit' dump, and given that under KVM the TB qht
is never initialized, we get a segfault. Thus, instead of complicating
the 'info jit' code with additional checks, let's allow passing an
uninitialized qht to qht_statistics_init.

While at it, add a test for this to test-qht.

Before the patch (for $ qemu -enable-kvm [...]):
(qemu) info jit
[...]
direct jump count   0 (0%) (2 jumps=0 0%)
Program received signal SIGSEGV, Segmentation fault.

After the patch the "TB hash buckets", "TB hash occupancy"
and "TB hash avg chain" lines are omitted.
(qemu) info jit
[...]
direct jump count   0 (0%) (2 jumps=0 0%)
TB hash buckets     0/0 (-nan% head buckets used)
TB hash occupancy   nan% avg chain occ. Histogram: (null)
TB hash avg chain   nan buckets. Histogram: (null)
[...]

Reported by: Changlong Xie <xiecl.fnst@cn.fujitsu.com>
Signed-off-by: Emilio G. Cota <cota@braap.org>
Message-Id: <1469205390-14369-1-git-send-email-cota@braap.org>
[Extract printing statistics to an entirely separate function. - Paolo]
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2016-08-02 12:03:58 +02:00
..
acpi-test-data
tests: add APIC.cphp and DSDT.cphp blobs
2016-07-04 19:43:33 +03:00
data
tests: use static qga config file
2016-07-25 13:23:18 -05:00
docker
docker: pass EXECUTABLE to build script
2016-07-20 19:19:43 +08:00
guest-debug
tests/guest-debug: introduce basic gdbstub tests
2015-12-17 13:37:15 +00:00
image-fuzzer
tests: Use Python 2.6 "except E as ..." syntax
2016-02-08 17:29:54 +01:00
libqos
Clean up ill-advised or unusual header guards
2016-07-12 16:20:46 +02:00
migration
tests: introduce a framework for testing migration performance
2016-07-22 13:23:39 +05:30
multiboot
…
qapi-schema
qapi: Implement boxed types for commands/events
2016-07-19 13:21:08 +02:00
qemu-iotests
iotest: fix python based IO tests
2016-07-26 18:28:40 +02:00
rocker
…
tcg
Use #include "..." for our own headers, <...> for others
2016-07-12 16:19:16 +02:00
vmstate-static-checker-data
…
.gitignore
qapi: Add new clone visitor
2016-07-06 10:52:04 +02:00
ac97-test.c
tests: Remove unnecessary glib.h includes
2016-06-07 18:19:24 +03:00
ahci-test.c
tests: in IDE and AHCI tests perform DMA write before flushing
2016-07-18 18:19:01 -04:00
bios-tables-test.c
tests: acpi: add CPU hotplug testcase
2016-07-04 16:49:34 +03:00
boot-order-test.c
tests: Remove unnecessary glib.h includes
2016-06-07 18:19:24 +03:00
boot-sector.c
all: Clean up includes
2016-02-23 12:43:05 +00:00
boot-sector.h
Clean up ill-advised or unusual header guards
2016-07-12 16:20:46 +02:00
check-block.sh
qemu-iotests: make check-block.sh work on out-of-tree builds
2016-01-07 21:30:16 +01:00
check-qdict.c
tests: Remove unnecessary glib.h includes
2016-06-07 18:19:24 +03:00
check-qfloat.c
tests: Remove unnecessary glib.h includes
2016-06-07 18:19:24 +03:00
check-qint.c
tests: Remove unnecessary glib.h includes
2016-06-07 18:19:24 +03:00
check-qjson.c
qapi: Improve use of qmp/types.h
2016-07-06 10:52:03 +02:00
check-qlist.c
tests: Remove unnecessary glib.h includes
2016-06-07 18:19:24 +03:00
check-qnull.c
qapi: Add new visit_complete() function
2016-07-06 10:52:04 +02:00
check-qom-interface.c
tests: Remove unnecessary glib.h includes
2016-06-07 18:19:24 +03:00
check-qom-proplist.c
tests: Remove unnecessary glib.h includes
2016-06-07 18:19:24 +03:00
check-qstring.c
tests: Remove unnecessary glib.h includes
2016-06-07 18:19:24 +03:00
crypto-tls-x509-helpers.c
tests: Clean up includes
2016-02-16 14:29:27 +00:00
crypto-tls-x509-helpers.h
crypto: add sanity checking of TLS x509 credentials
2015-09-15 15:05:09 +01:00
device-introspect-test.c
tests: Remove unnecessary glib.h includes
2016-06-07 18:19:24 +03:00
display-vga-test.c
coccinelle: Remove unnecessary variables for function return value
2016-06-20 16:38:13 +02:00
drive_del-test.c
tests: add drive_del-test to ppc/ppc64
2016-07-29 14:14:15 +10:00
ds1338-test.c
tests: Remove unnecessary glib.h includes
2016-06-07 18:19:24 +03:00
e1000-test.c
tests: Remove unnecessary glib.h includes
2016-06-07 18:19:24 +03:00
e1000e-test.c
clean-includes: run it once more
2016-06-16 18:39:03 +02:00
eepro100-test.c
tests: Remove unnecessary glib.h includes
2016-06-07 18:19:24 +03:00
endianness-test.c
coccinelle: Remove unnecessary variables for function return value
2016-06-20 16:38:13 +02:00
es1370-test.c
tests: Remove unnecessary glib.h includes
2016-06-07 18:19:24 +03:00
fdc-test.c
tests: Remove unnecessary glib.h includes
2016-06-07 18:19:24 +03:00
fw_cfg-test.c
tests: Remove unnecessary glib.h includes
2016-06-07 18:19:24 +03:00
hd-geo-test.c
tests: Remove unnecessary glib.h includes
2016-06-07 18:19:24 +03:00
i440fx-test.c
coccinelle: Remove unnecessary variables for function return value
2016-06-20 16:38:13 +02:00
i82801b11-test.c
tests: Remove unnecessary glib.h includes
2016-06-07 18:19:24 +03:00
ide-test.c
tests: in IDE and AHCI tests perform DMA write before flushing
2016-07-18 18:19:01 -04:00
intel-hda-test.c
coccinelle: Remove unnecessary variables for function return value
2016-06-20 16:38:13 +02:00
io-channel-helpers.c
include/qemu/osdep.h: Don't include qapi/error.h
2016-03-22 22:20:15 +01:00
io-channel-helpers.h
io: add QIOChannelSocket class
2015-12-18 12:18:31 +00:00
ioh3420-test.c
tests: Remove unnecessary glib.h includes
2016-06-07 18:19:24 +03:00
ipmi-bt-test.c
tests: Remove unnecessary glib.h includes
2016-06-07 18:19:24 +03:00
ipmi-kcs-test.c
tests: Remove unnecessary glib.h includes
2016-06-07 18:19:24 +03:00
ipoctal232-test.c
tests: Remove unnecessary glib.h includes
2016-06-07 18:19:24 +03:00
ivshmem-test.c
os-posix: include sys/mman.h
2016-06-16 18:39:03 +02:00
libqtest.c
tests: fix libqtest socket timeouts
2016-06-16 09:50:07 +05:30
libqtest.h
all: Clean up includes
2016-02-23 12:43:05 +00:00
m48t59-test.c
tests: Remove unnecessary glib.h includes
2016-06-07 18:19:24 +03:00
Makefile.include
tests: add drive_del-test to ppc/ppc64
2016-07-29 14:14:15 +10:00
ne2000-test.c
tests: Remove unnecessary glib.h includes
2016-06-07 18:19:24 +03:00
nvme-test.c
tests: Remove unnecessary glib.h includes
2016-06-07 18:19:24 +03:00
pc-cpu-test.c
tests: Remove unnecessary glib.h includes
2016-06-07 18:19:24 +03:00
pcnet-test.c
tests: Remove unnecessary glib.h includes
2016-06-07 18:19:24 +03:00
pkix_asn1_tab.c
tests: Clean up includes
2016-02-16 14:29:27 +00:00
postcopy-test.c
test: port postcopy test to ppc64
2016-07-29 12:02:31 +10:00
prom-env-test.c
tests/prom-env-test: increase the test timeout
2016-07-20 19:30:26 +03:00
pvpanic-test.c
tests: Remove unnecessary glib.h includes
2016-06-07 18:19:24 +03:00
pxe-test.c
tests: Remove unnecessary glib.h includes
2016-06-07 18:19:24 +03:00
q35-test.c
tests: Remove unnecessary glib.h includes
2016-06-07 18:19:24 +03:00
qemu-iotests-quick.sh
…
qht-bench.c
clean-includes: run it once more
2016-06-16 18:39:03 +02:00
qom-test.c
tests: Remove unnecessary glib.h includes
2016-06-07 18:19:24 +03:00
rcutorture.c
tests: Remove unnecessary glib.h includes
2016-06-07 18:19:24 +03:00
rtc-test.c
tests: Remove unnecessary glib.h includes
2016-06-07 18:19:24 +03:00
rtl8139-test.c
tests: Remove unnecessary glib.h includes
2016-06-07 18:19:24 +03:00
spapr-phb-test.c
tests: Remove unnecessary glib.h includes
2016-06-07 18:19:24 +03:00
tco-test.c
tests: Remove unnecessary glib.h includes
2016-06-07 18:19:24 +03:00
test-aio.c
tests: Remove unnecessary glib.h includes
2016-06-07 18:19:24 +03:00
test-base64.c
tests: Remove unnecessary glib.h includes
2016-06-07 18:19:24 +03:00
test-bitops.c
bitops.h: Implement half-shuffle and half-unshuffle ops
2016-06-17 15:23:51 +01:00
test-blockjob-txn.c
coroutine: move entry argument to qemu_coroutine_create
2016-07-13 13:26:02 +02:00
test-clone-visitor.c
qapi: Add new clone visitor
2016-07-06 10:52:04 +02:00
test-coroutine.c
coroutine: move entry argument to qemu_coroutine_create
2016-07-13 13:26:02 +02:00
test-crypto-afsplit.c
include/qemu/osdep.h: Don't include qapi/error.h
2016-03-22 22:20:15 +01:00
test-crypto-block.c
include/qemu/osdep.h: Don't include qapi/error.h
2016-03-22 22:20:15 +01:00
test-crypto-cipher.c
tests: Remove unnecessary glib.h includes
2016-06-07 18:19:24 +03:00
test-crypto-hash.c
crypto: implement sha224, sha384, sha512 and ripemd160 hashes
2016-07-04 15:52:36 +01:00
test-crypto-ivgen.c
include/qemu/osdep.h: Don't include qapi/error.h
2016-03-22 22:20:15 +01:00
test-crypto-pbkdf.c
include/qemu/osdep.h: Don't include qapi/error.h
2016-03-22 22:20:15 +01:00
test-crypto-secret.c
crypto: remove temp files on completion of secrets test
2016-06-13 12:41:17 +01:00
test-crypto-tlscredsx509.c
include/qemu/osdep.h: Don't include qapi/error.h
2016-03-22 22:20:15 +01:00
test-crypto-tlssession.c
include/qemu/osdep.h: Don't include qapi/error.h
2016-03-22 22:20:15 +01:00
test-crypto-xts.c
crypto: rename OUT to out in xts test to avoid clash on MinGW
2016-07-04 10:46:59 +01:00
test-cutils.c
tests: Remove unnecessary glib.h includes
2016-06-07 18:19:24 +03:00
test-filter-mirror.c
tests: Remove unnecessary glib.h includes
2016-06-07 18:19:24 +03:00
test-filter-redirector.c
coccinelle: Remove unnecessary variables for function return value
2016-06-20 16:38:13 +02:00
test-hbitmap.c
hbitmap: Use DIV_ROUND_UP
2016-06-07 18:19:25 +03:00
test-int128.c
tests: Remove unnecessary glib.h includes
2016-06-07 18:19:24 +03:00
test-io-channel-buffer.c
tests: Clean up includes
2016-02-16 14:29:27 +00:00
test-io-channel-command.c
include/qemu/osdep.h: Don't include qapi/error.h
2016-03-22 22:20:15 +01:00
test-io-channel-file.c
include/qemu/osdep.h: Don't include qapi/error.h
2016-03-22 22:20:15 +01:00
test-io-channel-socket.c
socket: unlink unix socket on remove
2016-06-29 16:49:41 +02:00
test-io-channel-tls.c
tests: Clean up includes
2016-02-16 14:29:27 +00:00
test-io-task.c
tests: Remove unnecessary glib.h includes
2016-06-07 18:19:24 +03:00
test-iov.c
tests: Remove unnecessary glib.h includes
2016-06-07 18:19:24 +03:00
test-logging.c
log: Permit -dfilter 0..0xffffffffffffffff
2016-07-04 16:49:33 +03:00
test-mul64.c
tests: Remove unnecessary glib.h includes
2016-06-07 18:19:24 +03:00
test-netfilter.c
tests: Remove unnecessary glib.h includes
2016-06-07 18:19:24 +03:00
test-opts-visitor.c
opts-visitor: Favor new visit_free() function
2016-07-06 10:52:04 +02:00
test-qdev-global-props.c
tests: Remove unnecessary glib.h includes
2016-06-07 18:19:24 +03:00
test-qdist.c
clean-includes: run it once more
2016-06-16 18:39:03 +02:00
test-qemu-opts.c
tests: Remove unnecessary glib.h includes
2016-06-07 18:19:24 +03:00
test-qga.c
tests: use static qga config file
2016-07-25 13:23:18 -05:00
test-qht-par.c
clean-includes: run it once more
2016-06-16 18:39:03 +02:00
test-qht.c
qht: do not segfault when gathering stats from an uninitialized qht
2016-08-02 12:03:58 +02:00
test-qmp-commands.c
qapi: Implement boxed types for commands/events
2016-07-19 13:21:08 +02:00
test-qmp-event.c
tests: Remove unnecessary glib.h includes
2016-06-07 18:19:24 +03:00
test-qmp-input-strict.c
qmp-input-visitor: Favor new visit_free() function
2016-07-06 10:52:04 +02:00
test-qmp-input-visitor.c
qmp-input-visitor: Favor new visit_free() function
2016-07-06 10:52:04 +02:00
test-qmp-output-visitor.c
qapi: Add new visit_complete() function
2016-07-06 10:52:04 +02:00
test-rcu-list.c
tests: Remove unnecessary glib.h includes
2016-06-07 18:19:24 +03:00
test-rfifolock.c
tests: Remove unnecessary glib.h includes
2016-06-07 18:19:24 +03:00
test-string-input-visitor.c
string-input-visitor: Favor new visit_free() function
2016-07-06 10:52:04 +02:00
test-string-output-visitor.c
qapi: Add new visit_complete() function
2016-07-06 10:52:04 +02:00
test-thread-pool.c
coroutine: move entry argument to qemu_coroutine_create
2016-07-13 13:26:02 +02:00
test-throttle.c
Merge remote-tracking branch 'remotes/mjt/tags/pull-trivial-patches-2016-06-07' into staging
2016-06-07 16:34:45 +01:00
test-timed-average.c
tests: Remove unnecessary glib.h includes
2016-06-07 18:19:24 +03:00
test-visitor-serialization.c
qapi: Add new visit_complete() function
2016-07-06 10:52:04 +02:00
test-vmstate.c
tests: Remove unnecessary glib.h includes
2016-06-07 18:19:24 +03:00
test-write-threshold.c
tests: Remove unnecessary glib.h includes
2016-06-07 18:19:24 +03:00
test-x86-cpuid.c
tests: Remove unnecessary glib.h includes
2016-06-07 18:19:24 +03:00
test-xbzrle.c
util: move declarations out of qemu-common.h
2016-03-22 22:20:17 +01:00
tmp105-test.c
tests: Remove unnecessary glib.h includes
2016-06-07 18:19:24 +03:00
tpci200-test.c
tests: Remove unnecessary glib.h includes
2016-06-07 18:19:24 +03:00
usb-hcd-ehci-test.c
tests: Remove unnecessary glib.h includes
2016-06-07 18:19:24 +03:00
usb-hcd-ohci-test.c
tests: Remove unnecessary glib.h includes
2016-06-07 18:19:24 +03:00
usb-hcd-uhci-test.c
tests: Remove unnecessary glib.h includes
2016-06-07 18:19:24 +03:00
usb-hcd-xhci-test.c
tests: Remove unnecessary glib.h includes
2016-06-07 18:19:24 +03:00
vhost-user-bridge.c
Use #include "..." for our own headers, <...> for others
2016-07-12 16:19:16 +02:00
vhost-user-test.c
tests: fix vhost-user-test leak
2016-07-29 00:33:49 +03:00
virtio-9p-test.c
tests: Remove unnecessary glib.h includes
2016-06-07 18:19:24 +03:00
virtio-balloon-test.c
tests: Remove unnecessary glib.h includes
2016-06-07 18:19:24 +03:00
virtio-blk-test.c
Merge remote-tracking branch 'remotes/armbru/tags/pull-error-2016-06-20' into staging
2016-06-20 16:19:18 +01:00
virtio-console-test.c
coccinelle: Remove unnecessary variables for function return value
2016-06-20 16:38:13 +02:00
virtio-net-test.c
tests: plug some leaks in virtio-net-test
2016-07-29 00:33:49 +03:00
virtio-rng-test.c
tests: Remove unnecessary glib.h includes
2016-06-07 18:19:24 +03:00
virtio-scsi-test.c
Merge remote-tracking branch 'remotes/armbru/tags/pull-error-2016-06-20' into staging
2016-06-20 16:19:18 +01:00
virtio-serial-test.c
tests: Remove unnecessary glib.h includes
2016-06-07 18:19:24 +03:00
vmxnet3-test.c
tests: Remove unnecessary glib.h includes
2016-06-07 18:19:24 +03:00
wdt_ib700-test.c
coccinelle: Remove unnecessary variables for function return value
2016-06-20 16:38:13 +02:00