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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>
88 lines
2.9 KiB
C
88 lines
2.9 KiB
C
/*
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* VFIO CPR
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*
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* Copyright (c) 2025 Oracle and/or its affiliates.
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*
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* SPDX-License-Identifier: GPL-2.0-or-later
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*/
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#ifndef HW_VFIO_VFIO_CPR_H
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#define HW_VFIO_VFIO_CPR_H
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#include "migration/misc.h"
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#include "system/memory.h"
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struct VFIOContainer;
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struct VFIOContainerBase;
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struct VFIOGroup;
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struct VFIODevice;
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struct VFIOPCIDevice;
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struct VFIOIOMMUFDContainer;
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struct IOMMUFDBackend;
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typedef int (*dma_map_fn)(const struct VFIOContainerBase *bcontainer,
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hwaddr iova, ram_addr_t size, void *vaddr,
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bool readonly, MemoryRegion *mr);
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typedef struct VFIOContainerCPR {
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Error *blocker;
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bool vaddr_unmapped;
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NotifierWithReturn transfer_notifier;
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MemoryListener remap_listener;
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} VFIOContainerCPR;
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typedef struct VFIODeviceCPR {
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Error *mdev_blocker;
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Error *id_blocker;
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uint32_t hwpt_id;
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uint32_t ioas_id;
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} VFIODeviceCPR;
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typedef struct VFIOPCICPR {
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NotifierWithReturn transfer_notifier;
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} VFIOPCICPR;
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bool vfio_legacy_cpr_register_container(struct VFIOContainer *container,
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Error **errp);
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void vfio_legacy_cpr_unregister_container(struct VFIOContainer *container);
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int vfio_cpr_reboot_notifier(NotifierWithReturn *notifier, MigrationEvent *e,
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Error **errp);
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bool vfio_iommufd_cpr_register_container(struct VFIOIOMMUFDContainer *container,
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Error **errp);
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void vfio_iommufd_cpr_unregister_container(
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struct VFIOIOMMUFDContainer *container);
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bool vfio_iommufd_cpr_register_iommufd(struct IOMMUFDBackend *be, Error **errp);
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void vfio_iommufd_cpr_unregister_iommufd(struct IOMMUFDBackend *be);
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void vfio_iommufd_cpr_register_device(struct VFIODevice *vbasedev);
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void vfio_iommufd_cpr_unregister_device(struct VFIODevice *vbasedev);
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void vfio_cpr_load_device(struct VFIODevice *vbasedev);
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int vfio_cpr_group_get_device_fd(int d, const char *name);
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bool vfio_cpr_container_match(struct VFIOContainer *container,
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struct VFIOGroup *group, int fd);
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void vfio_cpr_giommu_remap(struct VFIOContainerBase *bcontainer,
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MemoryRegionSection *section);
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bool vfio_cpr_ram_discard_register_listener(
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struct VFIOContainerBase *bcontainer, MemoryRegionSection *section);
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void vfio_cpr_save_vector_fd(struct VFIOPCIDevice *vdev, const char *name,
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int nr, int fd);
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int vfio_cpr_load_vector_fd(struct VFIOPCIDevice *vdev, const char *name,
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int nr);
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void vfio_cpr_delete_vector_fd(struct VFIOPCIDevice *vdev, const char *name,
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int nr);
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extern const VMStateDescription vfio_cpr_pci_vmstate;
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extern const VMStateDescription vmstate_cpr_vfio_devices;
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void vfio_cpr_add_kvm_notifier(void);
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void vfio_cpr_pci_register_device(struct VFIOPCIDevice *vdev);
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void vfio_cpr_pci_unregister_device(struct VFIOPCIDevice *vdev);
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#endif /* HW_VFIO_VFIO_CPR_H */
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