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vfio-pci: preserve MSI

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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>
This commit is contained in:
Steve Sistare 2025-07-02 14:58:38 -07:00 • committed by Cédric Le Goater
parent 3f2a36d0ef
commit 30edcb4d4e
4 changed files with 157 additions and 2 deletions
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8
include/hw/vfio/vfio-cpr.h
View file

@ -15,6 +15,7 @@
struct VFIOContainer;
struct VFIOContainerBase;
struct VFIOGroup;
struct VFIOPCIDevice;
typedef int (*dma_map_fn)(const struct VFIOContainerBase *bcontainer,
hwaddr iova, ram_addr_t size, void *vaddr,
@ -53,6 +54,13 @@ void vfio_cpr_giommu_remap(struct VFIOContainerBase *bcontainer,
bool vfio_cpr_ram_discard_register_listener(
struct VFIOContainerBase *bcontainer, MemoryRegionSection *section);
void vfio_cpr_save_vector_fd(struct VFIOPCIDevice *vdev, const char *name,
int nr, int fd);
int vfio_cpr_load_vector_fd(struct VFIOPCIDevice *vdev, const char *name,
int nr);
void vfio_cpr_delete_vector_fd(struct VFIOPCIDevice *vdev, const char *name,
int nr);
extern const VMStateDescription vfio_cpr_pci_vmstate;
#endif /* HW_VFIO_VFIO_CPR_H */