This series enables the ring-based dirty memory tracking for ARM64. The feature has been available and enabled on x86 for a while. It is beneficial when the number of dirty pages is small in a checkpointing system or live migration scenario. More details can be found from fb04a1eddb1a ("KVM: X86: Implement ring-based dirty memory tracking").
The generic part has been comprehensive enough, meaning there isn't too much work, needed to extend it to ARM64.
- PATCH[1] enables the feature on ARM64 - PATCH[2-5] improves kvm/selftests/dirty_log_test
Testing =======
- kvm/selftests/dirty_log_test - Live migration by QEMU - Host with 4KB or 64KB base page size
Gavin Shan (5): KVM: arm64: Enable ring-based dirty memory tracking KVM: selftests: Use host page size to map ring buffer in dirty_log_test KVM: selftests: Dirty host pages in dirty_log_test KVM: selftests: Clear dirty ring states between two modes in dirty_log_test KVM: selftests: Automate choosing dirty ring size in dirty_log_test
Documentation/virt/kvm/api.rst | 2 +- arch/arm64/include/uapi/asm/kvm.h | 1 + arch/arm64/kvm/Kconfig | 1 + arch/arm64/kvm/arm.c | 8 ++ tools/testing/selftests/kvm/dirty_log_test.c | 101 ++++++++++++++----- tools/testing/selftests/kvm/lib/kvm_util.c | 2 +- 6 files changed, 88 insertions(+), 27 deletions(-)