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vfio/container: preserve descriptors

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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>
This commit is contained in:
Steve Sistare 2025-06-10 08:39:17 -07:00 • committed by Cédric Le Goater
parent 54857b0816
commit c29a65ed68
3 changed files with 100 additions and 15 deletions
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6
include/hw/vfio/vfio-cpr.h
View file

@ -13,6 +13,7 @@
struct VFIOContainer;
struct VFIOContainerBase;
struct VFIOGroup;
typedef struct VFIOContainerCPR {
Error *blocker;
@ -30,4 +31,9 @@ bool vfio_cpr_register_container(struct VFIOContainerBase *bcontainer,
Error **errp);
void vfio_cpr_unregister_container(struct VFIOContainerBase *bcontainer);
int vfio_cpr_group_get_device_fd(int d, const char *name);
bool vfio_cpr_container_match(struct VFIOContainer *container,
struct VFIOGroup *group, int fd);
#endif /* HW_VFIO_VFIO_CPR_H */