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, meaning there isn't too much
work, needed to extend it to ARM64.
PATCH[1] introduces KVM_REQ_RING_SOFT_FULL for x86
PATCH[2] moves declaration of kvm_cpu_dirty_log_size()
PATCH[3] enables the feature on ARM64
PATCH[4-6] improves kvm/selftests/dirty_log_test
v2: https://lore.kernel.org/lkml/YyiV%2Fl7O23aw5aaO@xz-m1.local/T/
v1: https://lore.kernel.org/lkml/20220819005601.198436-1-gshan@xxxxxxxxxx
Testing
=======
(1) kvm/selftests/dirty_log_test
(2) Live migration by QEMU
Changelog
=========
v3:
* Check KVM_REQ_RING_SOFT_RULL inside kvm_request_pending() (Peter)
* Move declaration of kvm_cpu_dirty_log_size() (test-robot)
v2:
* Introduce KVM_REQ_RING_SOFT_FULL (Marc)
* Changelog improvement (Marc)
* Fix dirty_log_test without knowing host page size (Drew)
Gavin Shan (6):
KVM: x86: Introduce KVM_REQ_RING_SOFT_FULL
KVM: x86: Move declaration of kvm_cpu_dirty_log_size() to
kvm_dirty_ring.h
KVM: arm64: Enable ring-based dirty memory tracking
KVM: selftests: Use host page size to map ring buffer 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 +++
arch/x86/include/asm/kvm_host.h | 2 -
arch/x86/kvm/mmu/mmu.c | 2 +
arch/x86/kvm/x86.c | 19 +++----
include/linux/kvm_dirty_ring.h | 1 +
include/linux/kvm_host.h | 1 +
tools/testing/selftests/kvm/dirty_log_test.c | 53 ++++++++++++++------
tools/testing/selftests/kvm/lib/kvm_util.c | 2 +-
virt/kvm/dirty_ring.c | 4 ++
12 files changed, 69 insertions(+), 27 deletions(-)
--
2.23.0
