Handle errors when inserting into guest_memfd's binding xarray, e.g. to
do the right thing on ENOMEM.

Patch 2 is a related cleanup to remove a superflous WRITE_ONCE() (unwinding
the slot update on insertion failure isn't an option if the slot is observable,
i.e. if the WRITE_ONCE() is actually necessary).

Sean Christopherson (2):
  KVM: guest_memfd: Gracefully handle xarray errors when binding a
    memslot
  KVM: guest_memfd: Drop superfluous WRITE_ONCE() when binding a memslot

 virt/kvm/guest_memfd.c | 15 ++++++++++++---
 1 file changed, 12 insertions(+), 3 deletions(-)


base-commit: 76671054f9a1ff6abb976583cd8da37650acdc97
-- 
2.55.0.887.g758fc8c411-goog