Re: [PATCH v2 0/6] VFIO: cpr-transfer fixes

["Cédric Le Goater" <clg@redhat.com>]

On 9/28/25 10:54, Zhenzhong Duan wrote:
> Hi,
> 
> Patch1: fixed an error restore path when virtio-mem is configured.
> Patch2: fixed assert failure on error restore path, this issue happens
> no matter if virtio-mem is configured.
> Some trick is played to trigger the error path,
> see https://github.com/yiliu1765/qemu/commit/494d19e7f7242dbc47d7f236937cde0c396a4a7c
> 
> Patch3-4: issue only happens with two or more VFIO devices, no issue
> if only one VFIO device.
> 
> Patch5: fix a bug that impact "query-balloon" execution
> 
> Patch6: SIGSEGV if I send "query-balloon" to source qmp monitor,
> I'm not quite sure if it's deserved to be fixed, as guest has been
> migrated to destination, it's not a big issue for source qemu to
> SIGSEGV?
> 
> Thanks
> Zhenzhong
> 
> Changelog:
> v2:
> - minor polishment to commit log (Steve)
> - keep kvm_state so "query-balloon" could work after CPR-transfer (Markus)
> - add a fix which is found during "query-balloon" execution
> - rebased to master
> 
> Zhenzhong Duan (6):
>    vfio/container: Remap only populated parts in a section
>    vfio/cpr-legacy: drop an erroneous assert
>    vfio/iommufd: Set cpr.ioas_id on source side for CPR transfer
>    vfio/iommufd: Restore vbasedev's reference to hwpt after CPR transfer
>    accel/kvm: Fix an erroneous check on coalesced_mmio_ring
>    accel/kvm: Fix SIGSEGV when execute "query-balloon" after CPR transfer
> 
>   include/hw/vfio/vfio-cpr.h |  2 +-
>   accel/kvm/kvm-all.c        | 14 ++++++--------
>   hw/vfio/cpr-legacy.c       | 22 +++++++++++++++-------
>   hw/vfio/iommufd.c          |  8 ++++----
>   hw/vfio/listener.c         |  4 ++--
>   5 files changed, 28 insertions(+), 22 deletions(-)
> 


Applied patches 1-5 to vfio-next.

Thanks,

C.