This reverts commit aff8fd18f1.
Both virtio-net and virtio-crypto do not balance
virtio_queue_set_notification() enable and disable calls. This makes
the notifications_disabled counter unreliable and Doug Goldstein
reported the following assertion failure:
#3 0x00007ffff44d1c62 in __GI___assert_fail (
assertion=assertion@entry=0x555555ae8e8a "vq->notification_disabled > 0",
file=file@entry=0x555555ae89c0 "/home/doug/work/qemu/hw/virtio/virtio.c",
line=line@entry=215,
function=function@entry=0x555555ae9630 <__PRETTY_FUNCTION__.43707>
"virtio_queue_set_notification") at assert.c:101
#4 0x00005555557f25d6 in virtio_queue_set_notification (vq=0x55555666aa90,
enable=enable@entry=1) at /home/doug/work/qemu/hw/virtio/virtio.c:215
#5 0x00005555557dc311 in virtio_net_has_buffers (q=<optimized out>,
q=<optimized out>, bufsize=102)
at /home/doug/work/qemu/hw/net/virtio-net.c:1008
#6 virtio_net_receive (nc=<optimized out>, buf=0x555557386b88 "", size=102)
at /home/doug/work/qemu/hw/net/virtio-net.c:1148
#7 0x00005555559cad33 in nc_sendv_compat (flags=<optimized out>, iovcnt=1,
iov=0x7fffead746d0, nc=0x55555788b340) at net/net.c:705
#8 qemu_deliver_packet_iov (sender=<optimized out>, flags=<optimized out>,
iov=0x7fffead746d0, iovcnt=1, opaque=0x55555788b340) at net/net.c:732
#9 0x00005555559cd929 in qemu_net_queue_deliver (size=<optimized out>,
data=<optimized out>, flags=<optimized out>, sender=<optimized out>,
queue=0x55555788b550) at net/queue.c:164
#10 qemu_net_queue_flush (queue=0x55555788b550) at net/queue.c:261
This patch is safe to revert since it's just an optimization for
virtqueue polling. The next patch will improve the situation again
without resorting to nesting.
Reported-by: Doug Goldstein <cardoe@cardoe.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Tested-by: Richard Henderson <rth@twiddle.net>
Tested-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
virtio-net-pci does not enable ioeventfd for historical reasons (and
nobody ever checked whether it should be revisited). Note that other
backends do enable ioeventfd for virtio-net.
However, it has a major effect on performance. On Windows, throughput is
_multiplied_ by 2 or 3 on TCP_STREAM (on small packets it is "only" a 30%
improvement) and a little less so on TCP_MAERTS albeit still very much
statistically significant. Latency also has a single digit improvement.
This is not visible when using vhost, which forces ioeventfd=on, but it
is substantial without vhost. In addition, also on Windows and with the
RHEL 7.3 kernel, APICv seems to slow down virtio-net performance a bit,
but the penalty with this patch goes from -25% to -7%.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This reverts commit 4ac7691073.
This fixes
http://lists.nongnu.org/archive/html/qemu-devel/2017-01/msg03062.html
While I think we could get away with relying on the undocumented
behaviour, the tcg constraint system isn't powerful enough to
properly describe the required (non-)overlap conditions.
Reported-by: Eduardo Habkost <ehabkost@redhat.com>
Signed-off-by: Richard Henderson <rth@twiddle.net>
RER and WER are privileged instructions for accessing external
registers. External register address space is local to processor core.
There's no alignment requirements, addressable units are 32-bit wide
registers.
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1
iQEcBAABAgAGBQJYeOOmAAoJEPvQ2wlanipE3ZUH/Rsfpl23kXCMmqoXEIhWXy+h
yf8ARWCmpU6UKfwb+sH4vLegBfU56f62vVkGQ6oaaAbuyQ4SxCUlZGMO/rqY8/TE
m57aM+VfEE+bIdinAtLjFM24EVp/exMfkeutK7ItzLv7GwlrBos0J5veyCuyJ15q
pccV24jrpbJGilEeJ2GblKp3r2I3dInQGauOQhtoP3MNjHmYNSQD7noSbdN/JiTR
9H2eV700pg3ZPaSfO+CTVQN+cHjK1FC6qLi6916YZY9llnSOnDAegBYgbwE1RIBw
AULpWrezYveKy71eFhHVtGxnPeCJ8J4GVECMK0P0cdxzprIXFh1kZezyM4bxAGk=
=sboI
-----END PGP SIGNATURE-----
Merge remote-tracking branch 'remotes/stsquad/tags/pull-tcg-common-tlb-reset-20170113-r1' into staging
This is the same as the v3 posted except a re-base and a few extra signoffs
# gpg: Signature made Fri 13 Jan 2017 14:26:46 GMT
# gpg: using RSA key 0xFBD0DB095A9E2A44
# gpg: Good signature from "Alex Bennée (Master Work Key) <alex.bennee@linaro.org>"
# Primary key fingerprint: 6685 AE99 E751 67BC AFC8 DF35 FBD0 DB09 5A9E 2A44
* remotes/stsquad/tags/pull-tcg-common-tlb-reset-20170113-r1:
cputlb: drop flush_global flag from tlb_flush
cpu_common_reset: wrap TCG specific code in tcg_enabled()
qom/cpu: move tlb_flush to cpu_common_reset
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
CharDriverState.be should be updated to point to the current
associated backend.
Fix the regression introduced in the "mux" chardev from commit
a4afa548fc.
https://bugs.launchpad.net/bugs/1654137
Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-Id: <20170110110621.15287-1-marcandre.lureau@redhat.com>
Cc: qemu-stable@nongnu.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
rcu_read_unlock was not called if the address_space_access_valid result is
negative.
This caused (at least) a problem when qemu on PPC/E500+TAP failed to terminate
properly and instead got stuck in a deadlock.
Signed-off-by: Roman Kapl <rka@sysgo.com>
Message-Id: <20170109110921.4931-1-rka@sysgo.com>
Cc: qemu-stable@nongnu.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Split irqchip works based on the fact that we kept the first 24 gsi
routing entries inside KVM for userspace ioapic's use. When system
boot, we'll reserve these MSI routing entries before hand. However,
after migration, we forgot to re-configure it up in the destination
side. The result is, we'll get invalid gsi routing entries after
migration (all empty), and we get interrupts with vector=0, then
strange things happen, like keyboard hang.
The solution is simple - we update them after migration, which is a
one line fix.
Signed-off-by: Peter Xu <peterx@redhat.com>
Message-Id: <1483952153-7221-4-git-send-email-peterx@redhat.com>
Cc: qemu-stable@nongnu.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Peter Xu <peterx@redhat.com>
Message-Id: <1483952153-7221-3-git-send-email-peterx@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
From time to time, there are issues with ioapic, either on guest side or
on hypervisor side. Good to have some persistent traces for better
triaging and debugging.
Signed-off-by: Peter Xu <peterx@redhat.com>
Message-Id: <1483952153-7221-2-git-send-email-peterx@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Remove the colon, and add it in qemu-options-wrapper.h instead.
The introduction of @subsection also found a case where the table
was not closed and reopened around a heading, so fix it.
Reviewed-by: Markus Armbruster <armbru@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
QEMU will crash with the follow backtrace if the new created thread exited before
we call qemu_thread_set_name() for it.
(gdb) bt
#0 0x00007f9a68b095d7 in __GI_raise (sig=sig@entry=6) at ../nptl/sysdeps/unix/sysv/linux/raise.c:56
#1 0x00007f9a68b0acc8 in __GI_abort () at abort.c:90
#2 0x00007f9a69cda389 in PAT_abort () from /usr/lib64/libuvpuserhotfix.so
#3 0x00007f9a69cdda0d in patchIllInsHandler () from /usr/lib64/libuvpuserhotfix.so
#4 <signal handler called>
#5 pthread_setname_np (th=140298470549248, name=name@entry=0x8cc74a "io-task-worker") at ../nptl/sysdeps/unix/sysv/linux/pthread_setname.c:49
#6 0x00000000007f5f20 in qemu_thread_set_name (thread=thread@entry=0x7ffd2ac09680, name=name@entry=0x8cc74a "io-task-worker") at util/qemu_thread_posix.c:459
#7 0x00000000007f679e in qemu_thread_create (thread=thread@entry=0x7ffd2ac09680, name=name@entry=0x8cc74a "io-task-worker",start_routine=start_routine@entry=0x7c1300 <qio_task_thread_worker>, arg=arg@entry=0x7f99b8001720, mode=mode@entry=1) at util/qemu_thread_posix.c:498
#8 0x00000000007c15b6 in qio_task_run_in_thread (task=task@entry=0x7f99b80033d0, worker=worker@entry=0x7bd920 <qio_channel_socket_connect_worker>, opaque=0x7f99b8003370, destroy=0x7c6220 <qapi_free_SocketAddress>) at io/task.c:133
#9 0x00000000007bda04 in qio_channel_socket_connect_async (ioc=0x7f99b80014c0, addr=0x37235d0, callback=callback@entry=0x54ad00 <qemu_chr_socket_connected>, opaque=opaque@entry=0x38118b0, destroy=destroy@entry=0x0) at io/channel_socket.c:191
#10 0x00000000005487f6 in socket_reconnect_timeout (opaque=0x38118b0) at qemu_char.c:4402
#11 0x00007f9a6a1533b3 in g_timeout_dispatch () from /usr/lib64/libglib-2.0.so.0
#12 0x00007f9a6a15299a in g_main_context_dispatch () from /usr/lib64/libglib-2.0.so.0
#13 0x0000000000747386 in glib_pollfds_poll () at main_loop.c:227
#14 0x0000000000747424 in os_host_main_loop_wait (timeout=404000000) at main_loop.c:272
#15 0x0000000000747575 in main_loop_wait (nonblocking=nonblocking@entry=0) at main_loop.c:520
#16 0x0000000000557d31 in main_loop () at vl.c:2170
#17 0x000000000041c8b7 in main (argc=<optimized out>, argv=<optimized out>, envp=<optimized out>) at vl.c:5083
Let's detach the new thread after calling qemu_thread_set_name().
Signed-off-by: Caoxinhua <caoxinhua@huawei.com>
Signed-off-by: zhanghailiang <zhang.zhanghailiang@huawei.com>
Message-Id: <1483493521-9604-1-git-send-email-zhang.zhanghailiang@huawei.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
The serial_exit_core function doesn't free some resources.
This can lead memory leak when hotplug and unplug. This
patch avoid this.
Signed-off-by: Li Qiang <liqiang6-s@360.cn>
Message-Id: <586cb5ab.f31d9d0a.38ac3.acf2@mx.google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
The direction is wrong; scsi_block_is_passthrough returns
false for commands that *can* use sglists.
Reported-by: Zhang Qian <zhangqian@sangfor.com.cn>
Fixes: 8fdc7839e4
Cc: qemu-stable@nongnu.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
'hotplugged' propperty is meant to be used on migration side when migrating
source with hotplugged devices.
However though it not exacly correct usage of 'hotplugged' property
it's possible to set generic hotplugged property for CPU using
-cpu foo,hotplugged=on
or
-global foo.hotplugged=on
in this case qemu crashes with following backtrace:
...
because pc_cpu_plug() assumes that hotplugged CPU could appear only after
rtc/fw_cfg are initialized.
Fix crash by replacing assumption with explicit checks of rtc/fw_cfg
and updating them only if they were initialized.
Cc: qemu-stable@nongnu.org
Reported-by: Eduardo Habkost <ehabkost@redhat.com>
Reviewed-by: Eduardo Habkost <ehabkost@redhat.com>
Signed-off-by: Igor Mammedov <imammedo@redhat.com>
Message-Id: <1483108391-199542-1-git-send-email-imammedo@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Copy the mechanism of hw/smbios/smbios-stub.c to implement an ACPI-stub
instead, so that -acpitable can be later extended to ARM.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Remove the useless is_external argument. Since the iohandler
AioContext is never used for block devices, aio_disable_external
is never called on it. This lets us remove stubs/iohandler.c.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Some stubs are used for user-mode emulation only; they are not
needed by tools. Move them out of stubs/.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
They are small, it is not worth stubbing them. Just include them
in user-mode emulators and unit tests as well.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
monitor_cur_is_qmp was previously used by other stubs, but it's not
since 397d30e ("qemu-error: remove dependency of stubs on monitor",
2016-11-01).
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
-smbios command line options were accepted but silently ignored on
TARGET_ARM, due to a test for TARGET_I386 in arch_init.c.
Copy the mechanism of hw/pci/pci-stub.c to implement an smbios-stub
instead, enabled for all targets without CONFIG_SMBIOS.
Signed-off-by: Leif Lindholm <leif.lindholm@linaro.org>
Message-Id: <20161222151828.28292-1-leif.lindholm@linaro.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
"qom-list-types abstract=false" currently returns all interface
types, as if they were not abstract. Fix this by making sure all
interface types are abstract.
All interface types have instance_size == 0, so we can use
it to set abstract=true on type_initialize().
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
Message-Id: <1481567461-2341-1-git-send-email-ehabkost@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
If the guest sets the sglist size to a value >=2GB, megasas_handle_dcmd
will return MFI_STAT_MEMORY_NOT_AVAILABLE without freeing the memory.
Avoid this by returning only the status from map_dcmd, and loading
cmd->iov_size in the caller.
Reported-by: Li Qiang <liqiang6-s@360.cn>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
reset mc146818rtc device when RESET event happens.
Fix the problem:
1. Guest boot the second cpu, set CMOS_RESET_CODE 0x0a to protect selfboot;
2. VM being reset by others, hmp_system_reset;
3. seabios resume check the CMOS_RESET_CODE, if 0x0a, jump to the BDA
resume execution by jump via 40h:0067h;
4. Guest halt;
Signed-off-by: hangaohuai <hangaohuai@huawei.com>
Message-Id: <20161219060336.10176-1-hangaohuai@huawei.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
We need to disable per-vCPU events on a vCPU that is hot-unplugged to
keep the dynamic event state global counters consistent.
Signed-off-by: Lluís Vilanova <vilanova@ac.upc.edu>
Message-id: 148278748055.1404.1570530281528619895.stgit@fimbulvetr.bsc.es
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Fixes potential corruption when a vCPU is hot-(un)plugged while
initializing the current one.
Signed-off-by: Lluís Vilanova <vilanova@ac.upc.edu>
Message-id: 148278747515.1404.6538173443841279200.stgit@fimbulvetr.bsc.es
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Avoid entering the slow path of qemu_lockcnt_dec_and_lock if
no bottom half has to be deleted.
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Fam Zheng <famz@redhat.com>
Message-id: 20170112180800.21085-11-pbonzini@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Preparing for the following patch, use QLIST_FOREACH_SAFE and
modify the placement of walking_handlers increment/decrement.
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Fam Zheng <famz@redhat.com>
Message-id: 20170112180800.21085-7-pbonzini@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This simplifies the handling of dispatch_fds.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Fam Zheng <famz@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-id: 20170112180800.21085-6-pbonzini@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This is complex, but I think it is reasonably documented in the source.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Fam Zheng <famz@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-id: 20170112180800.21085-5-pbonzini@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This will make it possible to walk the list of bottom halves without
holding the AioContext lock---and in turn to call bottom half
handlers without holding the lock.
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Fam Zheng <famz@redhat.com>
Message-id: 20170112180800.21085-4-pbonzini@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
A QemuLockCnt comprises a counter and a mutex, with primitives
to increment and decrement the counter, and to take and release the
mutex. It can be used to do lock-free visits to a data structure
whenever mutexes would be too heavy-weight and the critical section
is too long for RCU.
This could be implemented simply by protecting the counter with the
mutex, but QemuLockCnt is harder to misuse and more efficient.
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Fam Zheng <famz@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-id: 20170112180800.21085-3-pbonzini@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This will be used for AioHandlers too. There is going to be little
or no contention, so it is better to reuse the same lock.
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Fam Zheng <famz@redhat.com>
Message-id: 20170112180800.21085-2-pbonzini@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Stefan Hajnoczi