[v2,0/4] KVM: Dynamic sized memslots array

Message

Peter Xu Sept. 4, 2024, 10:35 p.m. UTC

v2:
- Reordered patches, make the fix patch cc:stable
- s/NUM/NR/ for the newly introduced macros [DavidH]
- Added kvm_slots_double() wrapper [DavidH]

v1: https://lore.kernel.org/r/[e-mail]

This series make KVM memslots to be allocated dynamically in QEMU.  It
fixes a migration performance regression that I observed, reducing precopy
dirty sync process from ~86ms to ~3ms each time.

Patch 1 is the fix to the problem, while the rest three patches are
cleanups.

Thanks,

Peter Xu (4):
  KVM: Dynamic sized kvm memslots array
  KVM: Define KVM_MEMSLOTS_NUM_MAX_DEFAULT
  KVM: Rename KVMMemoryListener.nr_used_slots to nr_slots_used
  KVM: Rename KVMState->nr_slots to nr_slots_max

 include/sysemu/kvm_int.h |   7 +--
 accel/kvm/kvm-all.c      | 111 +++++++++++++++++++++++++++++++--------
 accel/kvm/trace-events   |   1 +
 3 files changed, 93 insertions(+), 26 deletions(-)