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Paul Donohue fb1a3a051d qemu-timer: Call clock reset notifiers on forward jumps 
Commit 691a0c9c introduced a mechanism by which QEMU_CLOCK_HOST can
notify other parts of the emulator when the host clock has jumped
backward.  This is used to avoid stalling timers that were scheduled
based on the host clock.

However, if the host clock jumps forward, then timers that were
scheduled based on the host clock may fire rapidly and cause other
problems.  For example, the mc146818rtc periodic timer will block
execution of the VM and consume host CPU while firing every interrupt
for the time period that was skipped by the host clock.

To correct that problem, this commit fires the reset notification if the
host clock jumps forward by more than a hard-coded limit.  The limit is
currently set to a value of 60 seconds, which should be small enough to
prevent excessive timer loops, but large enough to avoid frequent resets
in idle VMs.

Signed-off-by: Paul Donohue <qemu-git@PaulSD.com>
Message-Id: <20150612140845.GD2749@TopQuark.net>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2015-06-19 12:27:14 +02:00
audio ossaudio: use trace events instead of debug config flag 2015-06-15 12:42:48 +02:00
backends Extend TPM TIS interface to support TPM 2 2015-05-31 20:29:02 +02:00
block Block layer core and image format patches 2015-06-15 10:43:06 +01:00
bsd-user target-i386: use memory API to implement SMRAM 2015-06-05 17:36:39 +02:00
default-configs virtio-gpu: pci support bits and virtio-vga. 2015-06-16 10:35:43 +01:00
disas target-mips: add MTHC0 and MFHC0 instructions 2015-06-12 09:05:31 +01:00
docs -----BEGIN PGP SIGNATURE----- 2015-06-12 15:39:05 +01:00
dtc@65cc4d2748 dtc: Update dtc / libfdt submodule to version 1.4.0 2015-06-03 23:56:49 +02:00
fpu target-s390x: define default NaN values 2015-06-05 01:37:58 +02:00
fsdev Fix typos in comments 2015-03-19 11:30:37 +03:00
gdb-xml gdb-xml: Include XML for s390 vector registers 2015-05-27 17:52:03 +02:00
hw i8254: fix out-of-bounds memory access in pit_ioport_read() 2015-06-17 16:03:47 +02:00
include qemu-timer: Call clock reset notifiers on forward jumps 2015-06-19 12:27:14 +02:00
libcacard libcacard: do not use full paths for include files in the same dir 2015-04-30 16:05:48 +03:00
libdecnumber libdecnumber: Fix warnings from smatch (missing static, boolean operations) 2014-08-24 13:21:06 +04:00
linux-headers pc, acpi, virtio 2015-06-11 15:33:38 +01:00
linux-user linux-user: ioctl() command type is int 2015-06-16 09:37:17 +03:00
migration -----BEGIN PGP SIGNATURE----- 2015-06-12 15:39:05 +01:00
net Change qemu_set_fd_handler2(..., NULL, ...) to qemu_set_fd_handler 2015-06-12 13:26:21 +01:00
pc-bios s390/bios: build with -fdelete-null-pointer-checks 2015-06-15 13:31:33 +02:00
pixman@87eea99e44 pixman: update internal copy to pixman-0.32.6 2014-09-15 08:14:19 +02:00
po po: fix conflict with %.mo rule in rules.mak 2014-09-26 13:35:08 +02:00
qapi -----BEGIN PGP SIGNATURE----- 2015-06-12 18:04:14 +01:00
qga qemu-ga: Introduce Windows MSI script 2015-06-17 16:03:47 +02:00
qobject qdict: Add qdict_{set,copy}_default() 2015-06-12 16:58:06 +02:00
qom qom: add object_property_add_const_link 2015-06-05 17:36:39 +02:00
roms virtio-vga: add vgabios configuration 2015-06-12 10:13:23 +02:00
scripts Teach analyze-migration.py about section footers 2015-06-12 06:54:01 +02:00
slirp slirp: udp: fix NULL pointer dereference because of uninitialized socket 2014-09-23 19:15:05 +01:00
stubs iohandler: Change return type of qemu_set_fd_handler to "void" 2015-06-12 13:26:21 +01:00
target-alpha Revert "target-alpha: Add vector implementation for CMPBGE" 2015-05-22 12:30:13 +01:00
target-arm target-arm: Correct "preferred return address" for cpreg access exceptions 2015-06-15 18:06:11 +01:00
target-cris cris: remove unused cris_cond15 declarations 2015-03-19 11:11:55 +03:00
target-i386 migration: Use normal VMStateDescriptions for Subsections 2015-06-12 06:53:57 +02:00
target-lm32 tcg: Change translator-side labels to a pointer 2015-03-13 12:28:18 -07:00
target-m68k tcg: Change translator-side labels to a pointer 2015-03-13 12:28:18 -07:00
target-microblaze microblaze: cpu: Delete MMAP_SHIFT definition 2015-06-03 14:21:23 +03:00
target-mips target-mips: enable XPA and LPA features 2015-06-12 09:06:03 +01:00
target-moxie target-moxie: Fix warnings from Sparse (one-bit signed bitfield) 2015-03-19 11:11:55 +03:00
target-openrisc openrisc: cpu: Remove unused cpu_get_pc 2015-04-30 16:06:18 +03:00
target-ppc migration: Use normal VMStateDescriptions for Subsections 2015-06-12 06:53:57 +02:00
target-s390x s390x/kvm/watchdog 2015-06-15 13:24:51 +01:00
target-sh4 target-sh4: remove dead code 2015-06-12 12:02:48 +02:00
target-sparc tcg: Change translator-side labels to a pointer 2015-03-13 12:28:18 -07:00
target-tricore target-tricore: fix BOL_ST_H_LONGOFF using ld 2015-05-30 16:49:19 +02:00
target-unicore32 tcg: Change translator-side labels to a pointer 2015-03-13 12:28:18 -07:00
target-xtensa tcg: Change translator-side labels to a pointer 2015-03-13 12:28:18 -07:00
tcg tcg/optimize: rename tcg_constant_folding 2015-06-09 07:00:56 -07:00
tests tests: virtio-scsi: Add test for unaligned WRITE SAME 2015-06-19 12:27:12 +02:00
trace Remove superfluous '\n' around error_report() 2015-03-10 08:15:33 +03:00
ui Change qemu_set_fd_handler2(..., NULL, ...) to qemu_set_fd_handler 2015-06-12 13:26:21 +01:00
util -----BEGIN PGP SIGNATURE----- 2015-06-12 18:04:14 +01:00
.exrc qemu: add .exrc 2012-09-07 09:02:44 +03:00
.gitignore gitignore: Ignore more .pod files. 2015-04-04 09:45:59 +03:00
.gitmodules PPC: Add u-boot firmware for e500 2014-06-16 13:24:35 +02:00
.mailmap Update mailmap 2013-09-05 09:40:31 -05:00
.travis.yml .travis.yml: Add "--enable-modules" 2015-01-26 12:27:05 +01:00
accel.c accel: Create accel object when initializing machine 2014-10-09 15:36:14 +02:00
aio-posix.c AioContext: acquire/release AioContext during aio_poll 2015-04-28 15:36:08 +02:00
aio-win32.c AioContext: acquire/release AioContext during aio_poll 2015-04-28 15:36:08 +02:00
arch_init.c migration: reduce include files 2015-06-12 06:42:34 +02:00
async.c Revert "iothread: release iothread around aio_poll" 2015-06-12 13:58:33 +01:00
balloon.c balloon: improve error msg when adding second device 2015-04-24 14:18:05 -04:00
block.c Block layer core and image format patches 2015-06-15 10:43:06 +01:00
blockdev-nbd.c Change qemu_set_fd_handler2(..., NULL, ...) to qemu_set_fd_handler 2015-06-12 13:26:21 +01:00
blockdev.c Block layer core and image format patches 2015-06-15 10:43:06 +01:00
blockjob.c blockjob: Allow nested pause 2015-04-28 15:36:09 +02:00
bootdevice.c misc: fix typos in copyright declaration 2015-03-26 14:21:43 +01:00
bt-host.c sysemu: avoid proliferation of include/ subdirectories 2013-04-15 18:19:25 +02:00
bt-vhci.c sysemu: avoid proliferation of include/ subdirectories 2013-04-15 18:19:25 +02:00
Changelog Use qemu-project.org domain name 2013-10-11 09:34:56 -07:00
CODING_STYLE CODING_STYLE: Section about conditional statement 2014-08-15 18:54:06 +04:00
configure qemu-ga: Building Windows MSI installation with configure/Makefile 2015-06-17 16:03:47 +02:00
COPYING
COPYING.LIB
coroutine-gthread.c glib-compat.h: add new thread API emulation on top of pre-2.31 API 2014-06-10 07:44:01 +02:00
coroutine-sigaltstack.c coroutine-sigaltstack: Change jmp_buf to sigjmp_buf 2014-11-11 11:07:55 +03:00
coroutine-ucontext.c coroutine-ucontext: use __thread 2015-01-13 13:43:28 +00:00
coroutine-win32.c coroutine-win32.c: Add noinline attribute to work around gcc bug 2014-06-26 14:08:14 +01:00
cpu-exec.c - vhost-scsi: add bootindex property 2015-02-24 13:58:18 +00:00
cpus.c migration: Use normal VMStateDescriptions for Subsections 2015-06-12 06:53:57 +02:00
cputlb.c memory: replace cpu_physical_memory_reset_dirty() with test-and-clear 2015-06-05 17:10:00 +02:00
device_tree.c device-tree: Make a common-obj 2015-06-03 14:21:24 +03:00
device-hotplug.c pci-hotplug-old: Has been dead for five major releases, bury 2015-03-01 12:37:54 +01:00
disas.c monitor: QEMU Monitor Instruction Disassembly Incorrect for PowerPC LE Mode 2014-06-16 13:24:26 +02:00
dma-helpers.c range: remove useless inclusions 2015-04-30 16:05:48 +03:00
dump.c dump: Fix dump-guest-memory termination and use-after-close 2014-11-02 10:04:34 +03:00
exec.c qemu_ram_foreach_block: pass up error value, and down the ramblock name 2015-06-12 06:54:01 +02:00
gdbstub.c Revert "gdbstub: Do not kill target in system emulation mode" 2015-05-28 16:57:35 +01:00
HACKING HACKING: Document vaddr type usage 2013-07-23 02:41:31 +02:00
hmp-commands.hx qmp/hmp: add rocker device support 2015-06-12 13:42:17 +01:00
hmp.c -----BEGIN PGP SIGNATURE----- 2015-06-12 18:04:14 +01:00
hmp.h qmp/hmp: add rocker device support 2015-06-12 13:42:17 +01:00
iohandler.c iohandler: Change return type of qemu_set_fd_handler to "void" 2015-06-12 13:26:21 +01:00
ioport.c - miscellaneous cleanups for TCG (Emilio) and NBD (Bogdan) 2015-04-30 12:04:11 +01:00
iothread.c Revert "iothread: release iothread around aio_poll" 2015-06-12 13:58:33 +01:00
kvm-all.c kvm: remove special handling of DIRTY_MEMORY_MIGRATION in the dirty log mask 2015-06-05 17:09:59 +02:00
kvm-stub.c pc: kvm: check if KVM has free memory slots to avoid abort() 2014-11-23 12:11:29 +02:00
LICENSE vfio: move hw/misc/vfio.c to hw/vfio/pci.c Move vfio.h into include/hw/vfio 2014-12-19 15:24:06 -07:00
main-loop.c Change qemu_set_fd_handler2(..., NULL, ...) to qemu_set_fd_handler 2015-06-12 13:26:21 +01:00
MAINTAINERS MAINTAINERS: Add myself as ARM ACPI Subsystem maintainer 2015-06-15 18:06:08 +01:00
Makefile qemu-ga: Building Windows MSI installation with configure/Makefile 2015-06-17 16:03:47 +02:00
Makefile.objs device-tree: Make a common-obj 2015-06-03 14:21:24 +03:00
Makefile.target migration: move savevm.c inside migration/ 2015-06-12 06:42:30 +02:00
memory_mapping.c Add skip_dump flag to ignore memory region during dump 2014-10-31 11:29:01 +01:00
memory.c memory: use mr->ram_addr in "is this RAM?" assertions 2015-06-05 17:10:00 +02:00
module-common.c module: implement module loading 2014-02-20 13:14:18 +01:00
monitor.c audio: remove LOG_TO_MONITOR along with default_mon 2015-06-15 12:42:48 +02:00
nbd.c qemu-nbd: only send a limited number of errno codes on the wire 2015-05-08 14:45:11 +02:00
numa.c QemuOpts: Convert qemu_opts_foreach() to Error 2015-06-09 07:37:37 +02:00
os-posix.c rcu: do not create thread in pthread_atfork callback 2015-04-01 10:06:38 +02:00
os-win32.c pidfile: stop making pidfile error a special case 2014-11-02 10:04:34 +03:00
page_cache.c xbzrle: rebuild the cache_is_cached function 2015-01-15 17:49:43 +05:30
qapi-schema.json s390x/kvm/watchdog 2015-06-15 13:24:51 +01:00
qdev-monitor.c QemuOpts: Convert qemu_opt_foreach() to Error 2015-06-09 07:40:23 +02:00
qdict-test-data.txt
qemu-bridge-helper.c qemu-bridge-helper: Fix fd leak in main() 2014-06-27 10:39:10 +02:00
qemu-char.c qemu-char: remove unused list node from FDCharDriver 2015-04-30 16:05:49 +03:00
qemu-coroutine-io.c coroutine-io: Return -errno in case of error 2015-03-18 12:07:21 +01:00
qemu-coroutine-lock.c coroutine: remove unnecessary parentheses in qemu_co_queue_empty 2015-04-30 16:05:49 +03:00
qemu-coroutine-sleep.c coroutine: Drop co_sleep_ns 2014-08-29 10:46:58 +01:00
qemu-coroutine.c coroutine: Clean up qemu_coroutine_enter() 2015-03-09 11:11:59 +01:00
qemu-doc.texi raw-posix: Deprecate host floppy passthrough 2015-03-19 11:43:02 +01:00
qemu-img-cmds.hx qemu-img: Add progress output for amend 2014-11-03 11:41:48 +00:00
qemu-img.c util: move read_password method out of qemu-img into osdep/oslib 2015-05-22 17:08:01 +02:00
qemu-img.texi qemu-img: Add progress output for amend 2014-11-03 11:41:48 +00:00
qemu-io-cmds.c qemu-io: Use getopt() correctly 2015-05-22 17:08:01 +02:00
qemu-io.c qemu-io: prompt for encryption keys when required 2015-05-22 17:08:01 +02:00
qemu-log.c qemu-log: Correct help text of 'log cpu_reset' 2015-02-10 09:27:20 +03:00
qemu-nbd.c qemu-nbd: Switch to qemu_set_fd_handler 2015-06-05 17:09:58 +02:00
qemu-nbd.texi nbd: Miscellaneous typo fixes. 2014-05-24 00:07:29 +04:00
qemu-options-wrapper.h
qemu-options.h
qemu-options.hx virtio-gpu: pci support bits and virtio-vga. 2015-06-16 10:35:43 +01:00
qemu-seccomp.c seccomp: add mlockall to whitelist 2015-01-23 14:07:08 +01:00
qemu-tech.texi qemu-tech.texi: update implemented xtensa features list 2012-11-29 13:00:52 -06:00
qemu-timer.c qemu-timer: Call clock reset notifiers on forward jumps 2015-06-19 12:27:14 +02:00
qemu.nsi nsis: Improved support for parallel installation of 32 and 64 bit code 2013-11-07 07:02:44 +01:00
qemu.sasl sasl: Avoid 'Could not find keytab file' in syslog 2014-03-15 13:54:18 +04:00
qjson.c QJSON: Use OBJECT_CHECK 2015-05-11 08:59:07 -04:00
qmp-commands.hx -----BEGIN PGP SIGNATURE----- 2015-06-12 18:04:14 +01:00
qmp.c qapi: Drop inline nested struct in query-version 2015-05-05 18:39:02 +02:00
qtest.c qtest: pre-buffer hex nibs 2015-05-22 15:58:22 -04:00
README Use qemu-project.org domain name 2013-10-11 09:34:56 -07:00
rules.mak rules.mak: Force CFLAGS for all objects in DSO 2015-05-08 14:45:11 +02:00
softmmu_template.h softmmu: Add probe_write() 2015-06-11 10:13:28 +01:00
spice-qemu-char.c spice: fix spice_chr_add_watch() pre-condition 2015-05-29 09:56:01 +02:00
tcg-runtime.c tcg: Push tcg-runtime routines into exec/helper-* 2014-05-28 09:33:54 -07:00
tci.c tcg: Mask TCGMemOp appropriately for indexing 2015-06-09 06:35:29 -07:00
thread-pool.c thread-pool: clean up thread_pool_completion_bh() 2015-04-28 15:36:09 +02:00
thunk.c linux-user: Allocate thunk size dynamically 2015-06-15 11:36:58 +03:00
tpm.c QemuOpts: Convert qemu_opts_foreach() to Error 2015-06-09 07:37:37 +02:00
trace-events ossaudio: use trace events instead of debug config flag 2015-06-15 12:42:48 +02:00
translate-all.c translate-all: make less of tb_invalidate_phys_page_range depend on is_cpu_write_access 2015-06-05 17:09:59 +02:00
translate-all.h translate-all: remove unnecessary argument to tb_invalidate_phys_range 2015-06-05 17:09:59 +02:00
user-exec.c exec: move functions to translate-all.h 2015-06-05 17:09:59 +02:00
VERSION Open 2.4 development tree 2015-04-25 22:05:07 +01:00
version.rc Use qemu-project.org domain name 2013-10-11 09:34:56 -07:00
vl.c qemu-log: Open file for logging when specified 2015-06-17 16:03:46 +02:00
xen-common-stub.c accel: Move Xen registration code to xen-common.c 2014-10-04 08:59:15 +02:00
xen-common.c accel: Pass MachineState object to accel init functions 2014-10-09 12:57:10 +02:00
xen-hvm-stub.c xen: Remove xen_cmos_set_s3_resume() 2015-03-10 08:15:33 +03:00
xen-hvm.c memory: prepare for multiple bits in the dirty log mask 2015-06-05 17:09:59 +02:00
xen-mapcache.c xen: add a lock for the mapcache 2015-01-20 14:24:17 +00:00

README 

Read the documentation in qemu-doc.html or on http://wiki.qemu-project.org

- QEMU team