Currently the code that reads the qtest protocol commands insists
that every input line has a command. If it receives a line with
nothing but whitespace it will trip an assertion in
qtest_process_command().
This is a little awkward for the case where we are feeding qtest a
set of bug-reproduction commands via standard input or a file,
because it means you need to be careful not to leave a blank line at
the start or the end when cutting and pasting the command sequence
from a bug report.
Change the code to allow and ignore blank lines in the input.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Fabiano Rosas <farosas@suse.de>
Message-ID: <20251106151959.1088095-1-peter.maydell@linaro.org>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
In the qtest_event() QEMUChrEvent handler, we create a timer
and log OPENED on CHR_EVENT_OPENED, and we destroy the timer and
log CLOSED on CHR_EVENT_CLOSED. However, the chardev subsystem
can send us more than one CHR_EVENT_CLOSED if we're reading from
a file chardev:
* the first one happens when we read the last data from the file
* the second one happens when the user hits ^C to exit QEMU
and the chardev is finalized: char_fd_finalize()
This causes us to call g_timer_elapsed() with a NULL timer
(which glib complains about) and print an extra CLOSED log line
with a zero timestamp:
[I +0.063829] CLOSED
qemu-system-aarch64: GLib: g_timer_elapsed: assertion 'timer != NULL' failed
[I +0.000000] CLOSED
Avoid this by ignoring a CHR_EVENT_CLOSED if we have already
processed one.
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Laurent Vivier <lvivier@redhat.com>
Reviewed-by: Fabiano Rosas <farosas@suse.de>
Message-ID: <20251107174306.1408139-1-peter.maydell@linaro.org>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
mem + migration pull for 10.2
- Fabiano's patch to fix snapshot crash by rejecting some caps
- Marco's mapped-ram support on snapshot save/load
- Steve's cpr maintainers entry update on retirement
- Peter's coverity fixes
- Chenyi's tdx fix on hugetlbfs regression
- Peter's doc update on migrate resume flag
- Peter's doc update on HMP set parameter for cpr-exec-command's char** parsing
- Xiaoyao's guest-memfd fix for enabling shmem
- Arun's fix on error_fatal regression for migration errors
- Bin's fix on redundant error free for add block failures
- Markus's cleanup around MigMode sets
- Peter's two patches (out of loadvm threadify) to cleanup qio read peek process
- Thomas's vmstate-static-checker update for possible deprecation of argparse use
- Stefan's fix on windows deadlock by making unassigned MMIOs lockless
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# -----END PGP SIGNATURE-----
# gpg: Signature made Mon 03 Nov 2025 10:06:04 PM CET
# gpg: using EDDSA key B9184DC20CC457DACF7DD1A93B5FCCCDF3ABD706
# gpg: issuer "peterx@redhat.com"
# gpg: Good signature from "Peter Xu <xzpeter@gmail.com>" [unknown]
# gpg: aka "Peter Xu <peterx@redhat.com>" [unknown]
# gpg: WARNING: The key's User ID is not certified with a trusted signature!
# gpg: There is no indication that the signature belongs to the owner.
# Primary key fingerprint: B918 4DC2 0CC4 57DA CF7D D1A9 3B5F CCCD F3AB D706
* tag 'staging-pull-request' of https://gitlab.com/peterx/qemu: (36 commits)
migration: Introduce POSTCOPY_DEVICE state
migration: Make postcopy listen thread joinable
migration: Respect exit-on-error when migration fails before resuming
migration: Refactor all incoming cleanup info migration_incoming_destroy()
migration: Introduce postcopy incoming setup and cleanup functions
migration: Move postcopy_ram_listen_thread() to postcopy-ram.c
migration: Do not try to start VM if disk activation fails
migration: Flush migration channel after sending data of CMD_PACKAGED
system/physmem: mark io_mem_unassigned lockless
scripts/vmstate-static-checker: Fix deprecation warnings with latest argparse
migration: vmsd errp handlers: return bool
migration/vmstate: stop reporting error number for new _errp APIs
tmp_emulator: improve and fix use of errp
migration: vmstate_save_state_v(): fix error path
migration: Properly wait on G_IO_IN when peeking messages
io: Add qio_channel_wait_cond() helper
migration: Put Error **errp parameter last
migration: Use bitset of MigMode instead of variable arguments
migration: Use unsigned instead of int for bit set of MigMode
migration: Don't free the reason after calling migrate_add_blocker
...
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Merge crypto and other misc fixes / features
* Increase minimum gnutls to 3.7.5
* Increase minimum libgcrypt to 1.9.4
* Increase minimum nettle to 3.7.3
* Drop obsolete in-tree XTS impl
* Fix memory leak when loading certificates
* Remove/reduce duplication when loading certifcates
* Fix possible crash when certificates are unloaded
while an active TLS connection is using when in a
TLS handshake operation
* Deprecate use of dh-params.pem file
* Document how to create certificates with Post-Quantum
Cryptography compliant algorithms.
* Support loading multiple certificate identities to
allow support for Post-Quantum crypto in parallel
with traditional RSA/ECC
* Add "-run-with exit-with-parent=on" parameter
* Flush pending errors when seeing ENOBUFS with
a zero-copy send attempt
* Fix data buffer parameters in hash & IO channel APIs
to use 'void *'
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# gpg: Signature made Mon 03 Nov 2025 02:37:03 PM CET
# gpg: using RSA key DAF3A6FDB26B62912D0E8E3FBE86EBB415104FDF
# gpg: Good signature from "Daniel P. Berrange <dan@berrange.com>" [unknown]
# gpg: aka "Daniel P. Berrange <berrange@redhat.com>" [unknown]
# gpg: WARNING: This key is not certified with a trusted signature!
# gpg: There is no indication that the signature belongs to the owner.
# Primary key fingerprint: DAF3 A6FD B26B 6291 2D0E 8E3F BE86 EBB4 1510 4FDF
* tag 'next-pr-pull-request' of https://gitlab.com/berrange/qemu: (32 commits)
docs: creation of x509 certs compliant with post-quantum crypto
crypto: support upto 5 parallel certificate identities
crypto: expand logic to cope with multiple certificate identities
crypto: avoid loading the identity certs twice
crypto: avoid loading the CA certs twice
crypto: deprecate use of external dh-params.pem file
crypto: make TLS credentials structs private
crypto: fix lifecycle handling of gnutls credentials objects
crypto: introduce a wrapper around gnutls credentials
crypto: introduce method for reloading TLS creds
crypto: reduce duplication in handling TLS priority strings
crypto: remove duplication loading x509 CA cert
crypto: shorten the endpoint == server check in TLS creds
crypto: move release of DH parameters into TLS creds parent
crypto: remove needless indirection via parent_obj field
crypto: use g_autofree when loading x509 credentials
crypto: move check for TLS creds 'dir' property
crypto: remove redundant access() checks before loading certs
crypto: replace stat() with access() for credential checks
crypto: add missing free of certs array
...
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
When the Bus Master bit is disabled in a PCI device's Command Register,
the device's DMA address space becomes unassigned memory (i.e. the
io_mem_unassigned MemoryRegion).
This can lead to deadlocks with IOThreads since io_mem_unassigned
accesses attempt to acquire the Big QEMU Lock (BQL). For example,
virtio-pci devices deadlock in virtio_write_config() ->
virtio_pci_stop_ioeventfd() when waiting for the IOThread while holding
the BQL. The IOThread is unable to acquire the BQL but the vcpu thread
won't release the BQL while waiting for the IOThread.
io_mem_unassigned is trivially thread-safe since it has no state, it
simply rejects all load/store accesses. Therefore it is safe to enable
lockless I/O on io_mem_unassigned to eliminate this deadlock.
Here is the backtrace described above:
Thread 9 (Thread 0x7fccfcdff6c0 (LWP 247832) "CPU 4/KVM"):
#0 0x00007fcd11529d46 in ppoll () from target:/lib64/libc.so.6
#1 0x000056468a1a9bad in ppoll (__fds=<optimized out>, __nfds=<optimized out>, __timeout=0x0, __ss=0x0) at /usr/include/bits/poll2.h:88
#2 0x000056468a18f9d9 in fdmon_poll_wait (ctx=0x5646c6a1dc30, ready_list=0x7fccfcdfb310, timeout=-1) at ../util/fdmon-poll.c:79
#3 0x000056468a18f14f in aio_poll (ctx=<optimized out>, blocking=blocking@entry=true) at ../util/aio-posix.c:730
#4 0x000056468a1ad842 in aio_wait_bh_oneshot (ctx=<optimized out>, cb=cb@entry=0x564689faa420 <virtio_blk_ioeventfd_stop_vq_bh>, opaque=<optimized out>) at ../util/aio-wait.c:85
#5 0x0000564689faaa89 in virtio_blk_stop_ioeventfd (vdev=0x5646c8fd7e90) at ../hw/block/virtio-blk.c:1644
#6 0x0000564689d77880 in virtio_bus_stop_ioeventfd (bus=bus@entry=0x5646c8fd7e08) at ../hw/virtio/virtio-bus.c:264
#7 0x0000564689d780db in virtio_bus_stop_ioeventfd (bus=bus@entry=0x5646c8fd7e08) at ../hw/virtio/virtio-bus.c:256
#8 0x0000564689d7d98a in virtio_pci_stop_ioeventfd (proxy=0x5646c8fcf8e0) at ../hw/virtio/virtio-pci.c:413
#9 virtio_write_config (pci_dev=0x5646c8fcf8e0, address=4, val=<optimized out>, len=<optimized out>) at ../hw/virtio/virtio-pci.c:803
#10 0x0000564689dcb45a in memory_region_write_accessor (mr=mr@entry=0x5646c6dc2d30, addr=3145732, value=value@entry=0x7fccfcdfb528, size=size@entry=2, shift=<optimized out>, mask=mask@entry=65535, attrs=...) at ../system/memory.c:491
#11 0x0000564689dcaeb0 in access_with_adjusted_size (addr=addr@entry=3145732, value=value@entry=0x7fccfcdfb528, size=size@entry=2, access_size_min=<optimized out>, access_size_max=<optimized out>, access_fn=0x564689dcb3f0 <memory_region_write_accessor>, mr=0x5646c6dc2d30, attrs=...) at ../system/memory.c:567
#12 0x0000564689dcb156 in memory_region_dispatch_write (mr=mr@entry=0x5646c6dc2d30, addr=addr@entry=3145732, data=<optimized out>, op=<optimized out>, attrs=attrs@entry=...) at ../system/memory.c:1554
#13 0x0000564689dd389a in flatview_write_continue_step (attrs=..., attrs@entry=..., buf=buf@entry=0x7fcd05b87028 "", mr_addr=3145732, l=l@entry=0x7fccfcdfb5f0, mr=0x5646c6dc2d30, len=2) at ../system/physmem.c:3266
#14 0x0000564689dd3adb in flatview_write_continue (fv=0x7fcadc0d8930, addr=3761242116, attrs=..., ptr=0xe0300004, len=2, mr_addr=<optimized out>, l=<optimized out>, mr=<optimized out>) at ../system/physmem.c:3296
#15 flatview_write (fv=0x7fcadc0d8930, addr=addr@entry=3761242116, attrs=attrs@entry=..., buf=buf@entry=0x7fcd05b87028, len=len@entry=2) at ../system/physmem.c:3327
#16 0x0000564689dd7191 in address_space_write (as=0x56468b433600 <address_space_memory>, addr=3761242116, attrs=..., buf=0x7fcd05b87028, len=2) at ../system/physmem.c:3447
#17 address_space_rw (as=0x56468b433600 <address_space_memory>, addr=3761242116, attrs=attrs@entry=..., buf=buf@entry=0x7fcd05b87028, len=2, is_write=<optimized out>) at ../system/physmem.c:3457
#18 0x0000564689ff1ef6 in kvm_cpu_exec (cpu=cpu@entry=0x5646c6dab810) at ../accel/kvm/kvm-all.c:3248
#19 0x0000564689ff32f5 in kvm_vcpu_thread_fn (arg=arg@entry=0x5646c6dab810) at ../accel/kvm/kvm-accel-ops.c:53
#20 0x000056468a19225c in qemu_thread_start (args=0x5646c6db6190) at ../util/qemu-thread-posix.c:393
#21 0x00007fcd114c5b68 in start_thread () from target:/lib64/libc.so.6
#22 0x00007fcd115364e4 in clone () from target:/lib64/libc.so.6
Thread 3 (Thread 0x7fcd0503a6c0 (LWP 247825) "IO iothread1"):
#0 0x00007fcd114c2d30 in __lll_lock_wait () from target:/lib64/libc.so.6
#1 0x00007fcd114c8fe2 in pthread_mutex_lock@@GLIBC_2.2.5 () from target:/lib64/libc.so.6
#2 0x000056468a192538 in qemu_mutex_lock_impl (mutex=0x56468b432e60 <bql>, file=0x56468a1e26a5 "../system/physmem.c", line=3198) at ../util/qemu-thread-posix.c:94
#3 0x0000564689dc12e2 in bql_lock_impl (file=file@entry=0x56468a1e26a5 "../system/physmem.c", line=line@entry=3198) at ../system/cpus.c:566
#4 0x0000564689ddc151 in prepare_mmio_access (mr=0x56468b433800 <io_mem_unassigned>) at ../system/physmem.c:3198
#5 address_space_lduw_internal_cached_slow (cache=<optimized out>, addr=2, attrs=..., result=0x0, endian=DEVICE_LITTLE_ENDIAN) at ../system/memory_ldst.c.inc:211
#6 address_space_lduw_le_cached_slow (cache=<optimized out>, addr=addr@entry=2, attrs=attrs@entry=..., result=result@entry=0x0) at ../system/memory_ldst.c.inc:253
#7 0x0000564689fd692c in address_space_lduw_le_cached (result=0x0, cache=<optimized out>, addr=2, attrs=...) at /var/tmp/qemu/include/exec/memory_ldst_cached.h.inc:35
#8 lduw_le_phys_cached (cache=<optimized out>, addr=2) at /var/tmp/qemu/include/exec/memory_ldst_phys.h.inc:66
#9 virtio_lduw_phys_cached (vdev=<optimized out>, cache=<optimized out>, pa=2) at /var/tmp/qemu/include/hw/virtio/virtio-access.h:166
#10 vring_avail_idx (vq=0x5646c8fe2470) at ../hw/virtio/virtio.c:396
#11 virtio_queue_split_set_notification (vq=0x5646c8fe2470, enable=0) at ../hw/virtio/virtio.c:534
#12 virtio_queue_set_notification (vq=0x5646c8fe2470, enable=0) at ../hw/virtio/virtio.c:595
#13 0x000056468a18e7a8 in poll_set_started (ctx=ctx@entry=0x5646c6c74e30, ready_list=ready_list@entry=0x7fcd050366a0, started=started@entry=true) at ../util/aio-posix.c:247
#14 0x000056468a18f2bb in poll_set_started (ctx=0x5646c6c74e30, ready_list=0x7fcd050366a0, started=true) at ../util/aio-posix.c:226
#15 try_poll_mode (ctx=0x5646c6c74e30, ready_list=0x7fcd050366a0, timeout=<synthetic pointer>) at ../util/aio-posix.c:612
#16 aio_poll (ctx=0x5646c6c74e30, blocking=blocking@entry=true) at ../util/aio-posix.c:689
#17 0x000056468a032c26 in iothread_run (opaque=opaque@entry=0x5646c69f3380) at ../iothread.c:63
#18 0x000056468a19225c in qemu_thread_start (args=0x5646c6c75410) at ../util/qemu-thread-posix.c:393
#19 0x00007fcd114c5b68 in start_thread () from target:/lib64/libc.so.6
#20 0x00007fcd115364e4 in clone () from target:/lib64/libc.so.6
Buglink: https://issues.redhat.com/browse/RHEL-71933
Reported-by: Peixiu Hou <phou@redhat.com>
Cc: Kevin Wolf <kwolf@redhat.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Link: https://lore.kernel.org/r/20251029185224.420261-1-stefanha@redhat.com
Signed-off-by: Peter Xu <peterx@redhat.com>
Currently, CoCo VMs can perform conversion at the base page granularity,
which is the granularity that has to be tracked. In relevant setups, the
target page size is assumed to be equal to the host page size, thus
fixing the block size to the host page size.
However, since private memory and shared memory have different backend
at present, users can specify shared memory with a hugetlbfs backend
while private memory with guest_memfd backend only supports 4K page
size. In this scenario, ram_block->page_size is different from the host
page size which will trigger an assertion when retrieving the block
size.
To address this, return the host page size directly to relax the
restriction. This changes fixes a regression of using hugetlbfs backend
for shared memory within CoCo VMs, with or without VFIO devices' presence.
Acked-by: David Hildenbrand <david@redhat.com>
Tested-by: Farrah Chen <farrah.chen@intel.com>
Signed-off-by: Chenyi Qiang <chenyi.qiang@intel.com>
Link: https://lore.kernel.org/r/20251023095526.48365-2-chenyi.qiang@intel.com
[peterx: fix subject, per david]
Cc: qemu-stable <qemu-stable@nongnu.org>
Signed-off-by: Peter Xu <peterx@redhat.com>
QEMU has a per-thread "bql_locked" variable stored in TLS section, showing
whether the current thread is holding the BQL lock.
It's a pretty handy variable. Function-wise, QEMU have codes trying to
conditionally take bql, relying on the var reflecting the locking status
(e.g. BQL_LOCK_GUARD), or in a GDB debugging session, we could also look at
the variable (in reality, co_tls_bql_locked), to see which thread is
currently holding the bql.
When using that as a debugging facility, sometimes we can observe multiple
threads holding bql at the same time. It's because QEMU's condvar APIs
bypassed the bql_*() API, hence they do not update bql_locked even if they
have released the mutex while waiting.
It can cause confusion if one does "thread apply all p co_tls_bql_locked"
and see multiple threads reporting true.
Fix this by moving the bql status updates into the mutex debug hooks. Now
the variable should always reflect the reality.
Signed-off-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Message-ID: <20250904223158.1276992-1-peterx@redhat.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
cpus_kick_thread() is called via cpu_exit() -> qemu_cpu_kick(),
and also via gdb_syscall_handling(). Access the CPUState field
using atomic accesses. See commit 8ac2ca02744 ("accel: use atomic
accesses for exit_request") for rationale.
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Manos Pitsidianakis <manos.pitsidianakis@linaro.org>
Message-Id: <20250925025520.71805-3-philmd@linaro.org>
Libguestfs wants to use qemu to run a captive appliance. When the
program linked to libguestfs exits, we want qemu to be cleaned up.
Libguestfs goes to great lengths to do this at the moment: it either
forks a separate process to ensure clean-up is done, or it asks
libvirt to clean up the qemu process. However this is complicated and
not totally reliable.
On Linux, FreeBSD and macOS, there are mechanisms to ensure a signal
or message is delivered to a process when its parent process goes
away. The qemu test suite even uses this mechanism on Linux (see
PR_SET_PDEATHSIG in tests/qtest/libqtest.c).
In nbdkit we have long had the concept of running nbdkit captively,
and we have the nbdkit --exit-with-parent flag to help
(https://libguestfs.org/nbdkit-captive.1.html#EXIT-WITH-PARENT)
This commit adds the same mechanism. The syntax is:
qemu -run-with exit-with-parent=on [...]
This is not a feature that most typical users of qemu (for running
general purpose, long-lived VMs) should use, so it defaults to off.
The exit-with-parent.[ch] files are copied from nbdkit, where they
have a 3-clause BSD license which is compatible with qemu:
https://gitlab.com/nbdkit/nbdkit/-/tree/master/common/utils?ref_type=heads
Thanks: Daniel P. Berrangé <berrange@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Signed-off-by: Richard W.M. Jones <rjones@redhat.com>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
All the functions are about "-audio model=" handling, a simpler
way to setup audio. Rename functions/variables to reflect this better.
audio_register_model_with_cb() dropped "pci" from the name, since it
will be generalized next.
deprecated_register_soundhw() was actually not a function to be
removed since it's used for "-audio model=" aliasing.
Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
* char: rename CharBackend->CharFrontend
* esp: fix esp_cdb_ready() FIFO wraparound limit calculation
* isapc: warn rather than reject modern x86 CPU models
* mshv: fix Coverity issues
* qdev: Change PropertyInfo method print() to return malloc'ed string
* qobject: make refcount atomic
* rcu: make synchronize_rcu() more efficient
* rust: cleanup glib_sys bindings
* rust: Convert bit value to u8 within #[property]
* rust: only leave leaf crates as workspace members
* scripts: clean up meson-buildoptions.py
* scsi: make refcount atomic
* target/i386: Init SMM cpu address space for hotplugged CPUs
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# gpg: Signature made Wed 29 Oct 2025 10:24:21 AM CET
# gpg: using RSA key F13338574B662389866C7682BFFBD25F78C7AE83
# gpg: issuer "pbonzini@redhat.com"
# gpg: Good signature from "Paolo Bonzini <bonzini@gnu.org>" [unknown]
# gpg: aka "Paolo Bonzini <pbonzini@redhat.com>" [unknown]
# gpg: WARNING: The key's User ID is not certified with a trusted signature!
# gpg: There is no indication that the signature belongs to the owner.
# Primary key fingerprint: 46F5 9FBD 57D6 12E7 BFD4 E2F7 7E15 100C CD36 69B1
# Subkey fingerprint: F133 3857 4B66 2389 866C 7682 BFFB D25F 78C7 AE83
* tag 'for-upstream' of https://gitlab.com/bonzini/qemu:
rust: migration: allow passing ParentField<> to vmstate_of!
target/i386: clear CPU_INTERRUPT_SIPI for all accelerators
docs/about/deprecated.rst: document isapc deprecation for modern x86 CPU models
hw/i386/isapc.c: warn rather than reject modern x86 CPU models
qdev: Change PropertyInfo method print() to return malloc'ed string
scsi: make SCSIRequest refcount atomic
rust/qemu-macros: Convert bit value to u8 within #[property]
qtest/am53c974-test: add additional test for cmdfifo overflow
esp.c: fix esp_cdb_ready() FIFO wraparound limit calculation
accel/mshv: use return value of handle_pio_str_read
accel/mshv: initialize thread name
char: rename CharBackend->CharFrontend
qobject: make refcount atomic
rust: only leave leaf crates as workspace members
rust: remove useless glib_sys bindings
rcu: Unify force quiescent state
i386/kvm/cpu: Init SMM cpu address space for hotplugged CPUs
scripts: clean up meson-buildoptions.py
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
