Failing to stop logging in a vhost device is not exactly fatal. We can
log such an error, but there is no need to abort the whole qemu process
because of it.
Signed-off-by: Hanna Czenczek <hreitz@redhat.com>
Message-Id: <20250724125928.61045-3-hreitz@redhat.com>
Reviewed-by: Manos Pitsidianakis <manos.pitsidianakis@linaro.org>
Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>
Tested-by: Lei Yang <leiyang@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Commit 3688fec892 ("memory: Add Error** argument to .log_global_start()
handler") enabled vhost_log_global_start() to return a proper error, but
did not change it to do so; instead, it still aborts the whole process
on error.
This crash can be reproduced by e.g. killing a virtiofsd daemon before
initiating migration. In such a case, qemu should not crash, but just
make the attempted migration fail.
Buglink: https://issues.redhat.com/browse/RHEL-94534
Reported-by: Tingting Mao <timao@redhat.com>
Signed-off-by: Hanna Czenczek <hreitz@redhat.com>
Message-Id: <20250724125928.61045-2-hreitz@redhat.com>
Reviewed-by: Manos Pitsidianakis <manos.pitsidianakis@linaro.org>
Reviewed-by: Stefano Garzarella <sgarzare@redhat.com>
Tested-by: Lei Yang <leiyang@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Commit b44135daa3 introduced virtqueue_ordered_fill for
VIRTIO_F_IN_ORDER support but had a few issues:
* Conditional while loop used 'steps <= max_steps' but should've been
'steps < max_steps' since reaching steps == max_steps would indicate
that we didn't find an element, which is an error. Without this
change, the code would attempt to read invalid data at an index
outside of our search range.
* Incremented 'steps' using the next chain's ndescs instead of the
current one.
This patch corrects the loop bounds and synchronizes 'steps' and index
increments.
We also add a defensive sanity check against malicious or invalid
descriptor counts to avoid a potential infinite loop and DoS.
Fixes: b44135daa3 ("virtio: virtqueue_ordered_fill - VIRTIO_F_IN_ORDER support")
Reported-by: terrynini <terrynini38514@gmail.com>
Signed-off-by: Jonah Palmer <jonah.palmer@oracle.com>
Message-Id: <20250721150208.2409779-1-jonah.palmer@oracle.com>
Reviewed-by: Si-Wei Liu <si-wei.liu@oracle.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
SPCR acpi table can now be disabled
vhost-vdpa can now report hashing capability to guest
PPTT acpi table now tells guest vCPUs are identical
vost-user-blk now shuts down faster
loongarch64 now supports bios-tables-test
intel_iommu now supports ATS
cxl now supports DCD Fabric Management Command Set
arm now supports acpi pci hotplug
fixes, cleanups
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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Merge tag 'for_upstream' of https://git.kernel.org/pub/scm/virt/kvm/mst/qemu into staging
virtio,pci,pc: features, fixes, tests
SPCR acpi table can now be disabled
vhost-vdpa can now report hashing capability to guest
PPTT acpi table now tells guest vCPUs are identical
vost-user-blk now shuts down faster
loongarch64 now supports bios-tables-test
intel_iommu now supports ATS
cxl now supports DCD Fabric Management Command Set
arm now supports acpi pci hotplug
fixes, cleanups
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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# gpg: Signature made Tue 15 Jul 2025 02:56:48 EDT
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# gpg: issuer "mst@redhat.com"
# gpg: Good signature from "Michael S. Tsirkin <mst@kernel.org>" [full]
# gpg: aka "Michael S. Tsirkin <mst@redhat.com>" [full]
# 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
* tag 'for_upstream' of https://git.kernel.org/pub/scm/virt/kvm/mst/qemu: (97 commits)
hw/cxl: mailbox-utils: 0x5605 - FMAPI Initiate DC Release
hw/cxl: mailbox-utils: 0x5604 - FMAPI Initiate DC Add
hw/cxl: Create helper function to create DC Event Records from extents
hw/cxl: mailbox-utils: 0x5603 - FMAPI Get DC Region Extent Lists
hw/cxl: mailbox-utils: 0x5602 - FMAPI Set DC Region Config
hw/mem: cxl_type3: Add DC Region bitmap lock
hw/cxl: Move definition for dynamic_capacity_uuid and enum for DC event types to header
hw/cxl: mailbox-utils: 0x5601 - FMAPI Get Host Region Config
hw/mem: cxl_type3: Add dsmas_flags to CXLDCRegion struct
hw/cxl: mailbox-utils: 0x5600 - FMAPI Get DCD Info
hw/cxl: fix DC extent capacity tracking
tests: virt: Update expected ACPI tables for virt test
hw/acpi/aml-build: Build a root node in the PPTT table
hw/acpi/aml-build: Set identical implementation flag for PPTT processor nodes
tests: virt: Allow changes to PPTT test table
qtest/bios-tables-test: Generate reference blob for DSDT.acpipcihp
qtest/bios-tables-test: Generate reference blob for DSDT.hpoffacpiindex
tests/qtest/bios-tables-test: Add aarch64 ACPI PCI hotplug test
tests/qtest/bios-tables-test: Prepare for addition of acpi pci hp tests
hw/arm/virt: Let virt support pci hotplug/unplug GED event
...
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Conflicts:
net/vhost-vdpa.c
vhost_vdpa_set_steering_ebpf() was removed, resolve the context
conflict.
Now that various VirtIO files don't use target specific
API anymore, we can move them to the system_ss[] source
set to build them once.
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Manos Pitsidianakis <manos.pitsidianakis@linaro.org>
Reviewed-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
Message-Id: <20250708215320.70426-9-philmd@linaro.org>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Restrict "exec/tswap.h" to the tswap*() methods,
move the load/store helpers with the other ones
declared in "qemu/bswap.h".
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
Message-Id: <20250708215320.70426-8-philmd@linaro.org>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20250708215320.70426-6-philmd@linaro.org>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This adds an ability to skip GET_VRING_BASE during device stop entirely,
and thus the expensive drain operation that this call entails as well,
which may be useful during a non-graceful shutdown in case the guest
operating system hangs or refuses to react to a previously requested
ACPI shutdown for whatever reason.
Signed-off-by: Daniil Tatianin <d-tatianin@yandex-team.ru>
Message-Id: <20250609212547.2859224-3-d-tatianin@yandex-team.ru>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
When we unplug a vhost device, we end up calling vhost_dev_cleanup()
where we do a memory_listener_unregister().
This memory_listener_unregister() call will end up disconnecting the
listener from the address space through listener_del_address_space().
In that process, we effectively communicate the removal of all memory
regions from that listener, resulting in region_del() + commit()
callbacks getting triggered.
So in case of vhost, we end up calling vhost_commit() with no remaining
memory slots (0).
In vhost_commit() we end up overwriting the global variables
used_memslots / used_shared_memslots, used for detecting the number
of free memslots. With used_memslots / used_shared_memslots set to 0
by vhost_commit() during device removal, we'll later assume that the
other vhost devices still have plenty of memslots left when calling
vhost_get_free_memslots().
Let's fix it by simply removing the global variables and depending
only on the actual per-device count.
Easy to reproduce by adding two vhost-user devices to a VM and then
hot-unplugging one of them.
While at it, detect unexpected underflows in vhost_get_free_memslots()
and issue a warning.
Reported-by: yuanminghao <yuanmh12@chinatelecom.cn>
Link: https://lore.kernel.org/qemu-devel/20241121060755.164310-1-yuanmh12@chinatelecom.cn/
Fixes: 2ce68e4cf5 ("vhost: add vhost_has_free_slot() interface")
Cc: Igor Mammedov <imammedo@redhat.com>
Cc: Michael S. Tsirkin <mst@redhat.com>
Cc: Stefano Garzarella <sgarzare@redhat.com>
Signed-off-by: David Hildenbrand <david@redhat.com>
Message-Id: <20250603111336.1858888-1-david@redhat.com>
Reviewed-by: Igor Mammedov <imammedo@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
virtio_net_pre_load_queues() inspects vdev->guest_features to tell if
VIRTIO_NET_F_RSS or VIRTIO_NET_F_MQ is enabled to infer the required
number of queues. This works for VIRTIO_NET_F_MQ but it doesn't for
VIRTIO_NET_F_RSS because only the lowest 32 bits of vdev->guest_features
is set at the point and VIRTIO_NET_F_RSS uses bit 60 while
VIRTIO_NET_F_MQ uses bit 22.
Instead of inferring the required number of queues from
vdev->guest_features, use the number loaded from the vm state. This
change also has a nice side effect to remove a duplicate peer queue
pair change by circumventing virtio_net_set_multiqueue().
Also update the comment in include/hw/virtio/virtio.h to prevent an
implementation of pre_load_queues() from refering to any fields being
loaded during migration by accident in the future.
Fixes: 8c49756825 ("virtio-net: Add only one queue pair when realizing")
Tested-by: Lei Yang <leiyang@redhat.com>
Cc: qemu-stable@nongnu.org
Signed-off-by: Akihiko Odaki <akihiko.odaki@daynix.com>
Signed-off-by: Jason Wang <jasowang@redhat.com>
Update ReplayRamDiscard() function to return the result and unify the
ReplayRamPopulate() and ReplayRamDiscard() to ReplayRamDiscardState() at
the same time due to their identical definitions. This unification
simplifies related structures, such as VirtIOMEMReplayData, which makes
it cleaner.
Reviewed-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Pankaj Gupta <pankaj.gupta@amd.com>
Reviewed-by: Xiaoyao Li <xiaoyao.li@intel.com>
Signed-off-by: Chenyi Qiang <chenyi.qiang@intel.com>
Link: https://lore.kernel.org/r/20250612082747.51539-4-chenyi.qiang@intel.com
Signed-off-by: Peter Xu <peterx@redhat.com>
Modify memory_region_set_ram_discard_manager() to return -EBUSY if a
RamDiscardManager is already set in the MemoryRegion. The caller must
handle this failure, such as having virtio-mem undo its actions and fail
the realize() process. Opportunistically move the call earlier to avoid
complex error handling.
This change is beneficial when introducing a new RamDiscardManager
instance besides virtio-mem. After
ram_block_coordinated_discard_require(true) unlocks all
RamDiscardManager instances, only one instance is allowed to be set for
one MemoryRegion at present.
Suggested-by: David Hildenbrand <david@redhat.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Pankaj Gupta <pankaj.gupta@amd.com>
Tested-by: Alexey Kardashevskiy <aik@amd.com>
Reviewed-by: Alexey Kardashevskiy <aik@amd.com>
Reviewed-by: Xiaoyao Li <xiaoyao.li@intel.com>
Signed-off-by: Chenyi Qiang <chenyi.qiang@intel.com>
Link: https://lore.kernel.org/r/20250612082747.51539-3-chenyi.qiang@intel.com
Signed-off-by: Peter Xu <peterx@redhat.com>
Rename the helper to memory_region_section_intersect_range() to make it
more generic. Meanwhile, define the @end as Int128 and replace the
related operations with Int128_* format since the helper is exported as
a wider API.
Suggested-by: Alexey Kardashevskiy <aik@amd.com>
Reviewed-by: Alexey Kardashevskiy <aik@amd.com>
Reviewed-by: Pankaj Gupta <pankaj.gupta@amd.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Zhao Liu <zhao1.liu@intel.com>
Reviewed-by: Xiaoyao Li <xiaoyao.li@intel.com>
Signed-off-by: Chenyi Qiang <chenyi.qiang@intel.com>
Link: https://lore.kernel.org/r/20250612082747.51539-2-chenyi.qiang@intel.com
Signed-off-by: Peter Xu <peterx@redhat.com>
Since commit 7ff9ff0393 ("meson: mitigate against use of uninitialize
stack for exploits") the -ftrivial-auto-var-init=zero compiler option is
used to zero local variables. While this reduces security risks
associated with uninitialized stack data, it introduced a measurable
bottleneck in the virtqueue_split_pop() and virtqueue_packed_pop()
functions.
These virtqueue functions are in the hot path. They are called for each
element (request) that is popped from a VIRTIO device's virtqueue. Using
__attribute__((uninitialized)) on large stack variables in these
functions improves fio randread bs=4k iodepth=64 performance from 304k
to 332k IOPS (+9%).
This issue was found using perf-top(1). virtqueue_split_pop() was one of
the top CPU consumers and the "annotate" feature showed that the memory
zeroing instructions at the beginning of the functions were hot.
Fixes: 7ff9ff0393 ("meson: mitigate against use of uninitialize stack for exploits")
Cc: Daniel P. Berrangé <berrange@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-id: 20250610123709.835102-3-berrange@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Modify memory_get_xlat_addr and vfio_get_xlat_addr to return the memory
region that the translated address is found in. This will be needed by
CPR in a subsequent patch to map blocks using IOMMU_IOAS_MAP_FILE.
Also return the xlat offset, so we can simplify the interface by removing
the out parameters that can be trivially derived from mr and xlat.
Lastly, rename the functions to to memory_translate_iotlb() and
vfio_translate_iotlb().
Signed-off-by: Steve Sistare <steven.sistare@oracle.com>
Acked-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
Reviewed-by: John Levon <john.levon@nutanix.com>
Acked-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
Link: https://lore.kernel.org/qemu-devel/1747661203-136490-1-git-send-email-steven.sistare@oracle.com
Signed-off-by: Cédric Le Goater <clg@redhat.com>
vhost will now no longer set a call notifier if unused
some work towards loongarch testing based on bios-tables-test
some core pci work for SVM support in vtd
vhost vdpa init has been optimized for response time to QMP
A couple more fixes
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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Merge tag 'for_upstream' of https://git.kernel.org/pub/scm/virt/kvm/mst/qemu into staging
virtio,pci,pc: features, fixes, tests
vhost will now no longer set a call notifier if unused
some work towards loongarch testing based on bios-tables-test
some core pci work for SVM support in vtd
vhost vdpa init has been optimized for response time to QMP
A couple more fixes
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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* tag 'for_upstream' of https://git.kernel.org/pub/scm/virt/kvm/mst/qemu: (26 commits)
hw/i386/pc_piix: Fix RTC ISA IRQ wiring of isapc machine
vdpa: move memory listener register to vhost_vdpa_init
vdpa: move iova_tree allocation to net_vhost_vdpa_init
vdpa: reorder listener assignment
vdpa: add listener_registered
vdpa: set backend capabilities at vhost_vdpa_init
vdpa: reorder vhost_vdpa_set_backend_cap
vdpa: check for iova tree initialized at net_client_start
vhost: Don't set vring call if guest notifier is unused
tests/qtest/bios-tables-test: Use MiB macro rather hardcode value
tests/data/uefi-boot-images: Add ISO image for LoongArch system
uefi-test-tools:: Add LoongArch64 support
pci: Add a PCI-level API for PRI
pci: Add a pci-level API for ATS
pci: Add a pci-level initialization function for IOMMU notifiers
memory: Store user data pointer in the IOMMU notifiers
pci: Add an API to get IOMMU's min page size and virtual address width
pci: Cache the bus mastering status in the device
pcie: Helper functions to check to check if PRI is enabled
pcie: Add a helper to declare the PRI capability for a pcie device
...
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Current memory operations like pinning may take a lot of time at the
destination. Currently they are done after the source of the migration is
stopped, and before the workload is resumed at the destination. This is a
period where neigher traffic can flow, nor the VM workload can continue
(downtime).
We can do better as we know the memory layout of the guest RAM at the
destination from the moment that all devices are initializaed. So
moving that operation allows QEMU to communicate the kernel the maps
while the workload is still running in the source, so Linux can start
mapping them.
As a small drawback, there is a time in the initialization where QEMU
cannot respond to QMP etc. By some testing, this time is about
0.2seconds. This may be further reduced (or increased) depending on the
vdpa driver and the platform hardware, and it is dominated by the cost
of memory pinning.
This matches the time that we move out of the called downtime window.
The downtime is measured as the elapsed trace time between the last
vhost_vdpa_suspend on the source and the last vhost_vdpa_set_vring_enable_one
on the destination. In other words, from "guest CPUs freeze" to the
instant the final Rx/Tx queue-pair is able to start moving data.
Using ConnectX-6 Dx (MLX5) NICs in vhost-vDPA mode with 8 queue-pairs,
the series reduces guest-visible downtime during back-to-back live
migrations by more than half:
- 39G VM: 4.72s -> 2.09s (-2.63s, ~56% improvement)
- 128G VM: 14.72s -> 5.83s (-8.89s, ~60% improvement)
Tested-by: Lei Yang <leiyang@redhat.com>
Reviewed-by: Si-Wei Liu <si-wei.liu@oracle.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: Eugenio Pérez <eperezma@redhat.com>
Signed-off-by: Jonah Palmer <jonah.palmer@oracle.com>
Message-Id: <20250522145839.59974-8-jonah.palmer@oracle.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Since commit f6fe3e333f ("vdpa: move memory listener to
vhost_vdpa_shared") this piece of code repeatedly assign
shared->listener members. This was not a problem as it was not used
until device start.
However next patches move the listener registration to this
vhost_vdpa_init function. When the listener is registered it is added
to an embedded linked list, so setting its members again will cause
memory corruption to the linked list node.
Do the right thing and only set it in the first vdpa device.
Tested-by: Lei Yang <leiyang@redhat.com>
Reviewed-by: Si-Wei Liu <si-wei.liu@oracle.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: Eugenio Pérez <eperezma@redhat.com>
Signed-off-by: Jonah Palmer <jonah.palmer@oracle.com>
Message-Id: <20250522145839.59974-6-jonah.palmer@oracle.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Check if the listener has been registered or not, so it needs to be
registered again at start.
Tested-by: Lei Yang <leiyang@redhat.com>
Reviewed-by: Si-Wei Liu <si-wei.liu@oracle.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: Eugenio Pérez <eperezma@redhat.com>
Signed-off-by: Jonah Palmer <jonah.palmer@oracle.com>
Message-Id: <20250522145839.59974-5-jonah.palmer@oracle.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
The backend does not reset them until the vdpa file descriptor is closed
so there is no harm in doing it only once.
This allows the destination of a live migration to premap memory in
batches, using VHOST_BACKEND_F_IOTLB_BATCH.
Tested-by: Lei Yang <leiyang@redhat.com>
Reviewed-by: Si-Wei Liu <si-wei.liu@oracle.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: Eugenio Pérez <eperezma@redhat.com>
Signed-off-by: Jonah Palmer <jonah.palmer@oracle.com>
Message-Id: <20250522145839.59974-4-jonah.palmer@oracle.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
It will be used directly by vhost_vdpa_init.
Tested-by: Lei Yang <leiyang@redhat.com>
Reviewed-by: Si-Wei Liu <si-wei.liu@oracle.com>
Acked-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: Eugenio Pérez <eperezma@redhat.com>
Signed-off-by: Jonah Palmer <jonah.palmer@oracle.com>
Message-Id: <20250522145839.59974-3-jonah.palmer@oracle.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
The vring call fd is set even when the guest does not use MSI-X (e.g., in the
case of virtio PMD), leading to unnecessary CPU overhead for processing
interrupts.
The commit 96a3d98d2c("vhost: don't set vring call if no vector") optimized the
case where MSI-X is enabled but the queue vector is unset. However, there's an
additional case where the guest uses INTx and the INTx_DISABLED bit in the PCI
config is set, meaning that no interrupt notifier will actually be used.
In such cases, the vring call fd should also be cleared to avoid redundant
interrupt handling.
Fixes: 96a3d98d2c("vhost: don't set vring call if no vector")
Reported-by: Zhiyuan Yuan <yuanzhiyuan@chinatelecom.cn>
Signed-off-by: Jidong Xia <xiajd@chinatelecom.cn>
Signed-off-by: Huaitong Han <hanht2@chinatelecom.cn>
Message-Id: <20250522100548.212740-1-hanht2@chinatelecom.cn>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
virtio processes indirect descriptors even if the respected
feature VIRTIO_RING_F_INDIRECT_DESC was not negotiated.
If qemu is used with reduced set of features to emulate the
hardware device that does not support indirect descriptors,
the will probably trigger problematic flows on the hardware
setup but do not reveal the mistake on qemu.
Add LOG_GUEST_ERROR for such case. This will issue logs with
'-d guest_errors' in the command line
Signed-off-by: Yuri Benditovich <yuri.benditovich@daynix.com>
Message-Id: <20250515063237.808293-1-yuri.benditovich@daynix.com>
Signed-off-by: Yuri Benditovich <yuri.benditovich@daynix.com>
VIRTIO_PCI_FLAG_DISABLE_PCIE was only used by the hw_compat_2_4[]
array, via the 'x-disable-pcie=false' property. We removed all
machines using that array, lets remove all the code around
VIRTIO_PCI_FLAG_DISABLE_PCIE (see commit 9a4c0e220d for similar
VIRTIO_PCI_FLAG_* enum removal).
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: Zhao Liu <zhao1.liu@intel.com>
Reviewed-by: Xiaoyao Li <xiaoyao.li@intel.com>
Message-ID: <20250512083948.39294-9-philmd@linaro.org>
Signed-off-by: Thomas Huth <thuth@redhat.com>
VIRTIO_PCI_FLAG_MIGRATE_EXTRA was only used by the
hw_compat_2_4[] array, via the 'migrate-extra=true'
property. We removed all machines using that array,
lets remove all the code around VIRTIO_PCI_FLAG_MIGRATE_EXTRA.
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: Zhao Liu <zhao1.liu@intel.com>
Message-ID: <20250512083948.39294-8-philmd@linaro.org>
Signed-off-by: Thomas Huth <thuth@redhat.com>
Move virtio_reset() to a later part of the file to remove the forward
declaration of virtio_set_features_nocheck() and to prepare the
situation that we need more operations to perform during reset.
Signed-off-by: Akihiko Odaki <akihiko.odaki@daynix.com>
Message-Id: <20250421-reset-v2-2-e4c1ead88ea1@daynix.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
virtio-net expects set_features() will be called when the feature set
used by the guest changes to update the number of virtqueues but it is
not called during reset, which will clear all features, leaving the
queues added for VIRTIO_NET_F_MQ or VIRTIO_NET_F_RSS. Not only these
extra queues are visible to the guest, they will cause segmentation
fault during migration.
Call set_features() during reset to remove those queues for virtio-net
as we call set_status(). It will also prevent similar bugs for
virtio-net and other devices in the future.
Fixes: f9d6dbf0bf ("virtio-net: remove virtio queues if the guest doesn't support multiqueue")
Buglink: https://issues.redhat.com/browse/RHEL-73842
Cc: qemu-stable@nongnu.org
Signed-off-by: Akihiko Odaki <akihiko.odaki@daynix.com>
Message-Id: <20250421-reset-v2-1-e4c1ead88ea1@daynix.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Live migration should be terminated if the vhost-user backend crashes
before the migration completes.
Specifically, since the vhost device will be stopped when VM is stopped
before the end of the live migration, in current implementation if the
backend crashes, vhost-user device set_status() won't return failure,
live migration won't perceive the disconnection between QEMU and the
backend.
When the VM is migrated to the destination, the inflight IO will be
resubmitted, and if the IO was completed out of order before, it will
cause IO error.
To fix this issue:
1. Add the return value to set_status() for VirtioDeviceClass.
a. For the vhost-user device, return failure when the backend crashes.
b. For other virtio devices, always return 0.
2. Return failure if vhost_dev_stop() failed for vhost-user device.
If QEMU loses connection with the vhost-user backend, virtio set_status()
can return failure to the upper layer, migration_completion() can handle
the error, terminate the live migration, and restore the VM, so that
inflight IO can be completed normally.
Signed-off-by: Haoqian He <haoqian.he@smartx.com>
Message-Id: <20250416024729.3289157-4-haoqian.he@smartx.com>
Tested-by: Lei Yang <leiyang@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This patch captures the error of vhost_virtqueue_stop() in vhost_dev_stop()
and returns the error upward.
Specifically, if QEMU is disconnected from the vhost backend, some actions
in vhost_dev_stop() will fail, such as sending vhost-user messages to the
backend (GET_VRING_BASE, SET_VRING_ENABLE) and vhost_reset_status.
Considering that both set_vring_enable and vhost_reset_status require setting
the specific virtio feature bit, we can capture vhost_virtqueue_stop()'s
error to indicate that QEMU has lost connection with the backend.
This patch is the pre patch for 'vhost-user: return failure if backend crashes
when live migration', which makes the live migration aware of the loss of
connection with the vhost-user backend and aborts the live migration.
Signed-off-by: Haoqian He <haoqian.he@smartx.com>
Message-Id: <20250416024729.3289157-3-haoqian.he@smartx.com>
Tested-by: Lei Yang <leiyang@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This patch adds the new VM state change cb type `VMChangeStateHandlerWithRet`,
which has return value for `VMChangeStateEntry`.
Thus, we can register a new VM state change cb with return value for device.
Note that `VMChangeStateHandler` and `VMChangeStateHandlerWithRet` are mutually
exclusive and cannot be provided at the same time.
This patch is the pre patch for 'vhost-user: return failure if backend crashes
when live migration', which makes the live migration aware of the loss of
connection with the vhost-user backend and aborts the live migration.
Virtio device will use VMChangeStateHandlerWithRet.
Signed-off-by: Haoqian He <haoqian.he@smartx.com>
Message-Id: <20250416024729.3289157-2-haoqian.he@smartx.com>
Tested-by: Lei Yang <leiyang@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
A virtio-net device can be added as a SR-IOV VF to another virtio-pci
device that will be the PF.
Signed-off-by: Akihiko Odaki <akihiko.odaki@daynix.com>
Message-Id: <20250314-sriov-v9-7-57dae8ae3ab5@daynix.com>
Tested-by: Yui Washizu <yui.washidu@gmail.com>
Tested-by: Pasha Tatashin <pasha.tatashin@soleen.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Allow user to attach SR-IOV VF to a virtio-pci PF.
Signed-off-by: Akihiko Odaki <akihiko.odaki@daynix.com>
Message-Id: <20250314-sriov-v9-6-57dae8ae3ab5@daynix.com>
Tested-by: Yui Washizu <yui.washidu@gmail.com>
Tested-by: Pasha Tatashin <pasha.tatashin@soleen.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
In commit 98ed8ecfc9 ("exec: introduce target_words_bigendian()
helper") target_words_bigendian() was matching the definition it
was depending on (TARGET_WORDS_BIGENDIAN). Later in commit
ee3eb3a7ce ("Replace TARGET_WORDS_BIGENDIAN") the definition was
renamed as TARGET_BIG_ENDIAN but we didn't update the helper.
Do it now mechanically using:
$ sed -i -e s/target_words_bigendian/target_big_endian/g \
$(git grep -wl target_words_bigendian)
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
Message-Id: <20250417210025.68322-1-philmd@linaro.org>
All callers now correctly expect a const class data.
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20250424194905.82506-5-philmd@linaro.org>
Mechanical change using gsed, then style manually adapted
to pass checkpatch.pl script.
Suggested-by: Richard Henderson <richard.henderson@linaro.org>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20250424194905.82506-4-philmd@linaro.org>
A few functions now end with a label. The next commit will clean them
up.
Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-ID: <20250407082643.2310002-3-armbru@redhat.com>
[Straightforward conflict with commit 988ad4cceb (hw/loongarch/virt:
Fix cpuslot::cpu set at last in virt_cpu_plug()) resolved]
Convert the existing includes with sed.
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Convert the existing includes with sed.
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Convert the existing includes with sed.
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
Convert the existing includes with
sed -i ,exec/memory.h,system/memory.h,g
Move the include within cpu-all.h into a !CONFIG_USER_ONLY block.
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
For the s390x target, it's possible to build the QEMU binary without
CONFIG_VIRTIO_PCI and only have the virtio-mem device via the ccw
transport. In that case, QEMU currently fails to link correctly:
/usr/bin/ld: libqemu-s390x-softmmu.a.p/hw_s390x_s390-virtio-ccw.c.o: in function `s390_machine_device_pre_plug':
../hw/s390x/s390-virtio-ccw.c:579:(.text+0x1e96): undefined reference to `virtio_md_pci_pre_plug'
/usr/bin/ld: libqemu-s390x-softmmu.a.p/hw_s390x_s390-virtio-ccw.c.o: in function `s390_machine_device_plug':
../hw/s390x/s390-virtio-ccw.c:608:(.text+0x21a4): undefined reference to `virtio_md_pci_plug'
/usr/bin/ld: libqemu-s390x-softmmu.a.p/hw_s390x_s390-virtio-ccw.c.o: in function `s390_machine_device_unplug_request':
../hw/s390x/s390-virtio-ccw.c:622:(.text+0x2334): undefined reference to `virtio_md_pci_unplug_request'
/usr/bin/ld: libqemu-s390x-softmmu.a.p/hw_s390x_s390-virtio-ccw.c.o: in function `s390_machine_device_unplug':
../hw/s390x/s390-virtio-ccw.c:633:(.text+0x2436): undefined reference to `virtio_md_pci_unplug'
clang: error: linker command failed with exit code 1 (use -v to see invocation)
We also need to include the stubs when CONFIG_VIRTIO_PCI is missing.
Fixes: aa910c20ec ("s390x: virtio-mem support")
Message-ID: <20250313063522.1348288-1-thuth@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Thomas Huth <thuth@redhat.com>
The code that builds an array of AioContext pointers indexed by the
virtqueue is not specific to virtio-blk. virtio-scsi will need to do the
same thing, so extract the functions.
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Message-ID: <20250311132616.1049687-11-stefanha@redhat.com>
Tested-by: Peter Krempa <pkrempa@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Rather than checking ACPI availability at compile time by
checking the CONFIG_ACPI definition from CONFIG_DEVICES,
check at runtime via acpi_builtin().
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
Message-Id: <20250307223949.54040-5-philmd@linaro.org>
The pm_cap on the PCIExpressDevice object can be distilled down
to the new instance on the PCIDevice object.
Cc: Michael S. Tsirkin <mst@redhat.com>
Cc: Marcel Apfelbaum <marcel.apfelbaum@gmail.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Link: https://lore.kernel.org/qemu-devel/20250225215237.3314011-5-alex.williamson@redhat.com
Signed-off-by: Cédric Le Goater <clg@redhat.com>
Switch callers directly initializing the PCI PM capability with
pci_add_capability() to use pci_pm_init().
Cc: Dmitry Fleytman <dmitry.fleytman@gmail.com>
Cc: Akihiko Odaki <akihiko.odaki@daynix.com>
Cc: Jason Wang <jasowang@redhat.com>
Cc: Stefan Weil <sw@weilnetz.de>
Cc: Sriram Yagnaraman <sriram.yagnaraman@ericsson.com>
Cc: Keith Busch <kbusch@kernel.org>
Cc: Klaus Jensen <its@irrelevant.dk>
Cc: Jesper Devantier <foss@defmacro.it>
Cc: Michael S. Tsirkin <mst@redhat.com>
Cc: Marcel Apfelbaum <marcel.apfelbaum@gmail.com>
Cc: Cédric Le Goater <clg@redhat.com>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Reviewed-by: Akihiko Odaki <akihiko.odaki@daynix.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Link: https://lore.kernel.org/qemu-devel/20250225215237.3314011-3-alex.williamson@redhat.com
Signed-off-by: Cédric Le Goater <clg@redhat.com>
Features:
SR-IOV emulation for pci
virtio-mem-pci support for s390
interleave support for cxl
big endian support for vdpa svq
new QAPI events for vhost-user
Also vIOMMU reset order fixups are in.
Fixes, cleanups all over the place.
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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Merge tag 'for_upstream' of https://git.kernel.org/pub/scm/virt/kvm/mst/qemu into staging
virtio,pc,pci: features, fixes, cleanups
Features:
SR-IOV emulation for pci
virtio-mem-pci support for s390
interleave support for cxl
big endian support for vdpa svq
new QAPI events for vhost-user
Also vIOMMU reset order fixups are in.
Fixes, cleanups all over the place.
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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* tag 'for_upstream' of https://git.kernel.org/pub/scm/virt/kvm/mst/qemu: (41 commits)
docs/devel/reset: Document reset expectations for DMA and IOMMU
hw/vfio/common: Add a trace point in vfio_reset_handler
hw/arm/smmuv3: Move reset to exit phase
hw/i386/intel-iommu: Migrate to 3-phase reset
hw/virtio/virtio-iommu: Migrate to 3-phase reset
vhost-user-snd: correct the calculation of config_size
net: vhost-user: add QAPI events to report connection state
hw/virtio/virtio-nsm: Respond with correct length
vdpa: Fix endian bugs in shadow virtqueue
MAINTAINERS: add more files to `vhost`
cryptodev/vhost: allocate CryptoDevBackendVhost using g_mem0()
vhost-iova-tree: Update documentation
vhost-iova-tree, svq: Implement GPA->IOVA & partial IOVA->HVA trees
vhost-iova-tree: Implement an IOVA-only tree
amd_iommu: Use correct bitmask to set capability BAR
amd_iommu: Use correct DTE field for interrupt passthrough
hw/virtio: reset virtio balloon stats on machine reset
mem/cxl_type3: support 3, 6, 12 and 16 interleave ways
hw/mem/cxl_type3: Ensure errp is set on realization failure
hw/mem/cxl_type3: Fix special_ops memory leak on msix_init_exclusive_bar() failure
...
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
