[v5,0/7] KVM: arm64: Enable ring-based dirty memory tracking

Message

Gavin Shan Oct. 5, 2022, 12:41 a.m. UTC

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").

This series is applied on top of Marc's v2 series [0], fixing dirty-ring
ordering issue. This series is going to land on v6.1.rc0 pretty soon.

[0] https://lore.kernel.org/kvmarm/[e-mail]

v4: https://lore.kernel.org/kvmarm/[e-mail]/
v3: https://lore.kernel.org/r/[e-mail]
v2: https://lore.kernel.org/lkml/[e-mail]/T/
v1: https://lore.kernel.org/lkml/[e-mail]

Testing
=======
(1) kvm/selftests/dirty_log_test
(2) Live migration by QEMU

Changelog
=========
v5:
  * Drop empty stub kvm_dirty_ring_check_request()             (Marc/Peter)
  * Add PATCH[v5 3/7] to allow using bitmap, indicated by
    KVM_CAP_DIRTY_LOG_RING_ALLOW_BITMAP                        (Marc/Peter)
v4:
  * Commit log improvement                                     (Marc)
  * Add helper kvm_dirty_ring_check_request()                  (Marc)
  * Drop ifdef for kvm_cpu_dirty_log_size()                    (Marc)
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 (7):
  KVM: x86: Introduce KVM_REQ_RING_SOFT_FULL
  KVM: x86: Move declaration of kvm_cpu_dirty_log_size() to
    kvm_dirty_ring.h
  KVM: x86: Allow to use bitmap in ring-based dirty page tracking
  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               | 19 ++++---
 arch/arm64/include/uapi/asm/kvm.h            |  1 +
 arch/arm64/kvm/Kconfig                       |  1 +
 arch/arm64/kvm/arm.c                         |  3 ++
 arch/x86/include/asm/kvm_host.h              |  2 -
 arch/x86/kvm/x86.c                           | 15 +++---
 include/linux/kvm_dirty_ring.h               |  9 ++--
 include/linux/kvm_host.h                     |  1 +
 include/uapi/linux/kvm.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                        | 19 ++++++-
 virt/kvm/kvm_main.c                          | 24 ++++-----
 13 files changed, 92 insertions(+), 58 deletions(-)