Merge tag 'pull-vfio-20250810' of https://github.com/legoater/qemu into staging

vfio queue:

* Add documentation for the use-legacy-x86-rom property
* Preserve pending VFIO interrupts during CPR

#

Merge tag 'pull-vfio-20250810' of https://github.com/legoater/qemu into staging

vfio queue:

* Add documentation for the use-legacy-x86-rom property
* Preserve pending VFIO interrupts during CPR

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# gpg: aka "Cédric Le Goater <clg@kaod.org>" [full]
# Primary key fingerprint: A0F6 6548 F048 95EB FE6B 0B60 51A3 43C7 CFFB ECA1

* tag 'pull-vfio-20250810' of https://github.com/legoater/qemu:
vfio: Document 'use-legacy-x86-rom' property
vfio/pci: preserve pending interrupts
vfio/pci: augment set_handler

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

show more ...

vfio/pci: preserve pending interrupts

cpr-transfer may lose a VFIO interrupt because the KVM instance is
destroyed and recreated. If an interrupt arrives in the middle, it is
dropped. To fix, stop

vfio/pci: preserve pending interrupts

cpr-transfer may lose a VFIO interrupt because the KVM instance is
destroyed and recreated. If an interrupt arrives in the middle, it is
dropped. To fix, stop pending new interrupts during cpr save, and pick
up the pieces. In more detail:

Stop the VCPUs. Call kvm_irqchip_remove_irqfd_notifier_gsi --> KVM_IRQFD to
deassign the irqfd gsi that routes interrupts directly to the VCPU and KVM.
After this call, interrupts fall back to the kernel vfio_msihandler, which
writes to QEMU's kvm_interrupt eventfd. CPR already preserves that
eventfd. When the route is re-established in new QEMU, the kernel tests
the eventfd and injects an interrupt to KVM if necessary.

Deassign INTx in a similar manner. For both MSI and INTx, remove the
eventfd handler so old QEMU does not consume an event.

If an interrupt was already pended to KVM prior to the completion of
kvm_irqchip_remove_irqfd_notifier_gsi, it will be recovered by the
subsequent call to cpu_synchronize_all_states, which pulls KVM interrupt
state to userland prior to saving it in vmstate.

Signed-off-by: Steve Sistare <steven.sistare@oracle.com>
Reviewed-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
Link: https://lore.kernel.org/qemu-devel/1752689169-233452-3-git-send-email-steven.sistare@oracle.com
Signed-off-by: Cédric Le Goater <clg@redhat.com>

show more ...

Merge tag 'pull-vfio-20250704' of https://github.com/legoater/qemu into staging

vfio queue:

* Added small cleanups for b4 and scope
* Restricted TDX build to 64-bit target
* Fixed issues introduced

Merge tag 'pull-vfio-20250704' of https://github.com/legoater/qemu into staging

vfio queue:

* Added small cleanups for b4 and scope
* Restricted TDX build to 64-bit target
* Fixed issues introduced in first part of VFIO live update support
* Added full VFIO live update support

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# gpg: aka "Cédric Le Goater <clg@kaod.org>" [full]
# Primary key fingerprint: A0F6 6548 F048 95EB FE6B 0B60 51A3 43C7 CFFB ECA1

* tag 'pull-vfio-20250704' of https://github.com/legoater/qemu: (27 commits)
vfio: doc changes for cpr
vfio/container: delete old cpr register
iommufd: preserve DMA mappings
vfio/iommufd: change process
vfio/iommufd: reconstruct hwpt
vfio/iommufd: reconstruct device
vfio/iommufd: preserve descriptors
vfio/iommufd: cpr state
migration: vfio cpr state hook
vfio/iommufd: register container for cpr
vfio/iommufd: device name blocker
vfio/iommufd: add vfio_device_free_name
vfio/iommufd: invariant device name
vfio/iommufd: use IOMMU_IOAS_MAP_FILE
physmem: qemu_ram_get_fd_offset
backends/iommufd: change process ioctl
backends/iommufd: iommufd_backend_map_file_dma
migration: cpr_get_fd_param helper
migration: close kvm after cpr
vfio-pci: preserve INTx
...

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

show more ...

vfio/container: delete old cpr register

vfio_cpr_[un]register_container is no longer used since they were
subsumed by container type-specific registration. Delete them.

Signed-off-by: Steve Sistar

vfio/container: delete old cpr register

vfio_cpr_[un]register_container is no longer used since they were
subsumed by container type-specific registration. Delete them.

Signed-off-by: Steve Sistare <steven.sistare@oracle.com>
Reviewed-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
Link: https://lore.kernel.org/qemu-devel/1751493538-202042-21-git-send-email-steven.sistare@oracle.com
Signed-off-by: Cédric Le Goater <clg@redhat.com>

show more ...

vfio/iommufd: cpr state

VFIO iommufd devices will need access to ioas_id, devid, and hwpt_id in
new QEMU at realize time, so add them to CPR state. Define CprVFIODevice
as the object which holds th

vfio/iommufd: cpr state

VFIO iommufd devices will need access to ioas_id, devid, and hwpt_id in
new QEMU at realize time, so add them to CPR state. Define CprVFIODevice
as the object which holds the state and is serialized to the vmstate file.
Define accessors to copy state between VFIODevice and CprVFIODevice.

Signed-off-by: Steve Sistare <steven.sistare@oracle.com>
Reviewed-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
Link: https://lore.kernel.org/qemu-devel/1751493538-202042-15-git-send-email-steven.sistare@oracle.com
Signed-off-by: Cédric Le Goater <clg@redhat.com>

show more ...

migration: vfio cpr state hook

Define a list of vfio devices in CPR state, in a subsection so that
older QEMU can be live updated to this version. However, new QEMU
will not be live updateable to o

migration: vfio cpr state hook

Define a list of vfio devices in CPR state, in a subsection so that
older QEMU can be live updated to this version. However, new QEMU
will not be live updateable to old QEMU. This is acceptable because
CPR is not yet commonly used, and updates to older versions are unusual.

The contents of each device object will be defined by the vfio subsystem
in a subsequent patch.

Signed-off-by: Steve Sistare <steven.sistare@oracle.com>
Reviewed-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
Link: https://lore.kernel.org/qemu-devel/1751493538-202042-14-git-send-email-steven.sistare@oracle.com
Signed-off-by: Cédric Le Goater <clg@redhat.com>

show more ...

vfio/iommufd: register container for cpr

Register a vfio iommufd container and device for CPR, replacing the generic
CPR register call with a more specific iommufd register call. Add a
blocker if t

vfio/iommufd: register container for cpr

Register a vfio iommufd container and device for CPR, replacing the generic
CPR register call with a more specific iommufd register call. Add a
blocker if the kernel does not support IOMMU_IOAS_CHANGE_PROCESS.

This is mostly boiler plate. The fields to to saved and restored are added
in subsequent patches.

Signed-off-by: Steve Sistare <steven.sistare@oracle.com>
Reviewed-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
Link: https://lore.kernel.org/qemu-devel/1751493538-202042-13-git-send-email-steven.sistare@oracle.com
Signed-off-by: Cédric Le Goater <clg@redhat.com>

show more ...

vfio/iommufd: device name blocker

If an invariant device name cannot be created, block CPR.

Signed-off-by: Steve Sistare <steven.sistare@oracle.com>
Reviewed-by: Zhenzhong Duan <zhenzhong.duan@inte

vfio/iommufd: device name blocker

If an invariant device name cannot be created, block CPR.

Signed-off-by: Steve Sistare <steven.sistare@oracle.com>
Reviewed-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
Link: https://lore.kernel.org/qemu-devel/1751493538-202042-12-git-send-email-steven.sistare@oracle.com
Signed-off-by: Cédric Le Goater <clg@redhat.com>

show more ...

migration: close kvm after cpr

cpr-transfer breaks vfio network connectivity to and from the guest, and
the host system log shows:
irq bypass consumer (token 00000000a03c32e5) registration fails:

migration: close kvm after cpr

cpr-transfer breaks vfio network connectivity to and from the guest, and
the host system log shows:
irq bypass consumer (token 00000000a03c32e5) registration fails: -16
which is EBUSY. This occurs because KVM descriptors are still open in
the old QEMU process. Close them.

Cc: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Steve Sistare <steven.sistare@oracle.com>
Reviewed-by: Fabiano Rosas <farosas@suse.de>
Link: https://lore.kernel.org/qemu-devel/1751493538-202042-4-git-send-email-steven.sistare@oracle.com
Signed-off-by: Cédric Le Goater <clg@redhat.com>

show more ...

vfio-pci: preserve MSI

Save the MSI message area as part of vfio-pci vmstate, and preserve the
interrupt and notifier eventfd's. migrate_incoming loads the MSI data,
then the vfio-pci post_load han

vfio-pci: preserve MSI

Save the MSI message area as part of vfio-pci vmstate, and preserve the
interrupt and notifier eventfd's. migrate_incoming loads the MSI data,
then the vfio-pci post_load handler finds the eventfds in CPR state,
rebuilds vector data structures, and attaches the interrupts to the new
KVM instance.

Signed-off-by: Steve Sistare <steven.sistare@oracle.com>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
Link: https://lore.kernel.org/qemu-devel/1751493538-202042-2-git-send-email-steven.sistare@oracle.com
Signed-off-by: Cédric Le Goater <clg@redhat.com>

show more ...

vfio/container: Fix vfio_container_post_load()

When there are multiple VFIO containers, vioc->dma_map is restored
multiple times, this made only first container work and remaining
containers using v

vfio/container: Fix vfio_container_post_load()

When there are multiple VFIO containers, vioc->dma_map is restored
multiple times, this made only first container work and remaining
containers using vioc->dma_map restored by first container.

Fix it by save and restore vioc->dma_map locally. saved_dma_map in
VFIOContainerCPR becomes useless and is removed.

Fixes: 7e9f21411302 ("vfio/container: restore DMA vaddr")
Signed-off-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
Reviewed-by: Steve Sistare <steven.sistare@oracle.com>
Link: https://lore.kernel.org/qemu-devel/20250627063332.5173-3-zhenzhong.duan@intel.com
Signed-off-by: Cédric Le Goater <clg@redhat.com>

show more ...

Merge tag 'pull-vfio-20250611' of https://github.com/legoater/qemu into staging

vfio queue:

* Fixed newly added potential issues in vfio-pci
* Added support to report vfio-ap configuration changes

Merge tag 'pull-vfio-20250611' of https://github.com/legoater/qemu into staging

vfio queue:

* Fixed newly added potential issues in vfio-pci
* Added support to report vfio-ap configuration changes
* Added prerequisite support for vfio-user
* Added first part for VFIO live update support

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# gpg: aka "Cédric Le Goater <clg@kaod.org>" [full]
# Primary key fingerprint: A0F6 6548 F048 95EB FE6B 0B60 51A3 43C7 CFFB ECA1

* tag 'pull-vfio-20250611' of https://github.com/legoater/qemu: (27 commits)
vfio: improve VFIODeviceIOOps docs
vfio/pci: export MSI functions
vfio/pci: vfio_notifier_cleanup
vfio/pci: vfio_notifier_init cpr parameters
vfio/pci: pass vector to virq functions
vfio/pci: vfio_notifier_init
vfio/pci: vfio_pci_vector_init
vfio-pci: skip reset during cpr
pci: skip reset during cpr
pci: export msix_is_pending
vfio/container: recover from unmap-all-vaddr failure
vfio/container: mdev cpr blocker
vfio/container: restore DMA vaddr
vfio/container: discard old DMA vaddr
vfio/container: preserve descriptors
vfio/container: register container for cpr
migration: lower handler priority
migration: cpr helpers
vfio: mark posted writes in region write callbacks
vfio: add per-region fd support
...

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

show more ...

vfio-pci: skip reset during cpr

Do not reset a vfio-pci device during CPR, and do not complain if the
kernel's PCI config space changes for non-emulated bits between the
vmstate save and load, which

vfio-pci: skip reset during cpr

Do not reset a vfio-pci device during CPR, and do not complain if the
kernel's PCI config space changes for non-emulated bits between the
vmstate save and load, which can happen due to ongoing interrupt activity.

Signed-off-by: Steve Sistare <steven.sistare@oracle.com>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
Link: https://lore.kernel.org/qemu-devel/1749569991-25171-12-git-send-email-steven.sistare@oracle.com
Signed-off-by: Cédric Le Goater <clg@redhat.com>

show more ...

vfio/container: recover from unmap-all-vaddr failure

If there are multiple containers and unmap-all fails for some container, we
need to remap vaddr for the other containers for which unmap-all succ

vfio/container: recover from unmap-all-vaddr failure

If there are multiple containers and unmap-all fails for some container, we
need to remap vaddr for the other containers for which unmap-all succeeded.
Recover by walking all address ranges of all containers to restore the vaddr
for each. Do so by invoking the vfio listener callback, and passing a new
"remap" flag that tells it to restore a mapping without re-allocating new
userland data structures.

Signed-off-by: Steve Sistare <steven.sistare@oracle.com>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
Link: https://lore.kernel.org/qemu-devel/1749569991-25171-9-git-send-email-steven.sistare@oracle.com
Signed-off-by: Cédric Le Goater <clg@redhat.com>

show more ...

vfio/container: mdev cpr blocker

During CPR, after VFIO_DMA_UNMAP_FLAG_VADDR, the vaddr is temporarily
invalid, so mediated devices cannot be supported. Add a blocker for them.
This restriction wil

vfio/container: mdev cpr blocker

During CPR, after VFIO_DMA_UNMAP_FLAG_VADDR, the vaddr is temporarily
invalid, so mediated devices cannot be supported. Add a blocker for them.
This restriction will not apply to iommufd containers when CPR is added
for them in a future patch.

Signed-off-by: Steve Sistare <steven.sistare@oracle.com>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
Link: https://lore.kernel.org/qemu-devel/1749569991-25171-8-git-send-email-steven.sistare@oracle.com
[ clg: Fixed context change in VFIODevice ]
Signed-off-by: Cédric Le Goater <clg@redhat.com>

show more ...

vfio/container: restore DMA vaddr

In new QEMU, do not register the memory listener at device creation time.
Register it later, in the container post_load handler, after all vmstate
that may affect r

vfio/container: restore DMA vaddr

In new QEMU, do not register the memory listener at device creation time.
Register it later, in the container post_load handler, after all vmstate
that may affect regions and mapping boundaries has been loaded. The
post_load registration will cause the listener to invoke its callback on
each flat section, and the calls will match the mappings remembered by the
kernel.

The listener calls a special dma_map handler that passes the new VA of each
section to the kernel using VFIO_DMA_MAP_FLAG_VADDR. Restore the normal
handler at the end.

Signed-off-by: Steve Sistare <steven.sistare@oracle.com>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
Link: https://lore.kernel.org/qemu-devel/1749569991-25171-7-git-send-email-steven.sistare@oracle.com
Signed-off-by: Cédric Le Goater <clg@redhat.com>

show more ...

vfio/container: preserve descriptors

At vfio creation time, save the value of vfio container, group, and device
descriptors in CPR state. On qemu restart, vfio_realize() finds and uses
the saved de

vfio/container: preserve descriptors

At vfio creation time, save the value of vfio container, group, and device
descriptors in CPR state. On qemu restart, vfio_realize() finds and uses
the saved descriptors.

During reuse, device and iommu state is already configured, so operations
in vfio_realize that would modify the configuration, such as vfio ioctl's,
are skipped. The result is that vfio_realize constructs qemu data
structures that reflect the current state of the device.

Signed-off-by: Steve Sistare <steven.sistare@oracle.com>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
Reviewed-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
Link: https://lore.kernel.org/qemu-devel/1749569991-25171-5-git-send-email-steven.sistare@oracle.com
Signed-off-by: Cédric Le Goater <clg@redhat.com>

show more ...

vfio/container: register container for cpr

Register a legacy container for cpr-transfer, replacing the generic CPR
register call with a more specific legacy container register call. Add a
blocker i

vfio/container: register container for cpr

Register a legacy container for cpr-transfer, replacing the generic CPR
register call with a more specific legacy container register call. Add a
blocker if the kernel does not support VFIO_UPDATE_VADDR or VFIO_UNMAP_ALL.

This is mostly boiler plate. The fields to to saved and restored are added
in subsequent patches.

Signed-off-by: Steve Sistare <steven.sistare@oracle.com>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
Link: https://lore.kernel.org/qemu-devel/1749569991-25171-4-git-send-email-steven.sistare@oracle.com
Signed-off-by: Cédric Le Goater <clg@redhat.com>

show more ...

Merge tag 'pull-vfio-20250605' of https://github.com/legoater/qemu into staging

vfio queue:

* Fixed OpRegion detection in IGD
* Added prerequisite rework for IOMMU nesting support
* Added prerequis

Merge tag 'pull-vfio-20250605' of https://github.com/legoater/qemu into staging

vfio queue:

* Fixed OpRegion detection in IGD
* Added prerequisite rework for IOMMU nesting support
* Added prerequisite rework for vfio-user
* Added prerequisite rework for VFIO live update
* Modified memory_get_xlat_addr() to return a MemoryRegion

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# -----END PGP SIGNATURE-----
# gpg: Signature made Thu 05 Jun 2025 04:40:56 EDT
# gpg: using RSA key A0F66548F04895EBFE6B0B6051A343C7CFFBECA1
# gpg: Good signature from "Cédric Le Goater <clg@redhat.com>" [full]
# gpg: aka "Cédric Le Goater <clg@kaod.org>" [full]
# Primary key fingerprint: A0F6 6548 F048 95EB FE6B 0B60 51A3 43C7 CFFB ECA1

* tag 'pull-vfio-20250605' of https://github.com/legoater/qemu:
vfio: move vfio-cpr.h
vfio: vfio_find_ram_discard_listener
MAINTAINERS: Add reviewer for CPR
vfio/iommufd: Save vendor specific device info
vfio/iommufd: Implement [at|de]tach_hwpt handlers
vfio/iommufd: Add properties and handlers to TYPE_HOST_IOMMU_DEVICE_IOMMUFD
backends/iommufd: Add a helper to invalidate user-managed HWPT
vfio/container: pass MemoryRegion to DMA operations
vfio: return mr from vfio_get_xlat_addr
vfio/igd: Fix incorrect error propagation in vfio_pci_igd_opregion_detect()
vfio/iommufd: Add comment emphasizing no movement of hiod->realize() call
vfio: refactor out IRQ signalling setup
vfio: move config space read into vfio_pci_config_setup()
vfio: move more cleanup into vfio_pci_put_device()
vfio: add more VFIOIOMMUClass docs
vfio/igd: OpRegion not found fix error typo

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

show more ...

vfio: move vfio-cpr.h

Move vfio-cpr.h to include/hw/vfio, because it will need to be included by
other files there.

Signed-off-by: Steve Sistare <steven.sistare@oracle.com>
Reviewed-by: Cédric Le G

vfio: move vfio-cpr.h

Move vfio-cpr.h to include/hw/vfio, because it will need to be included by
other files there.

Signed-off-by: Steve Sistare <steven.sistare@oracle.com>
Reviewed-by: Cédric Le Goater <clg@redhat.com>
Reviewed-by: Zhenzhong Duan <zhenzhong.duan@intel.com>
Link: https://lore.kernel.org/qemu-devel/1748546679-154091-9-git-send-email-steven.sistare@oracle.com
Signed-off-by: Cédric Le Goater <clg@redhat.com>

show more ...