Fixes a memory leak in the mdev remove callback when invoked while the mdev is in use by a KVM guest. Instead of returning -EBUSY from the callback, a full cleanup of the resources allocated to the mdev is performed because regardless of the value returned from the function, the mdev is removed from sysfs. The cleanup of resources allocated to the mdev may coincide with the interception of the PQAP(AQIC) instruction in which case data needed to handle the interception may get removed. A patch is included in this series to synchronize access to resources needed by the interception handler to protect against invalid memory accesses. Change log: v2 -> v3: -------- * Added a patch to control access to the PQAP(AQIC) hook using RCU v1 -> v2: -------- * Call vfio_ap_mdev_unset_kvm() function from the remove callback instead of merely clearing the guest's APCB. Tony Krowiak (2): s390/vfio-ap: fix memory leak in mdev remove callback s390/vfio-ap: control access to PQAP(AQIC) interception handler arch/s390/include/asm/kvm_host.h | 1 + arch/s390/kvm/priv.c | 47 +++++++++++++--------- drivers/s390/crypto/vfio_ap_ops.c | 67 +++++++++++++++++++++---------- 3 files changed, 75 insertions(+), 40 deletions(-) -- 2.30.2
