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/20220926145120.27974-1-maz@xxxxxxxxxx
v5: https://lore.kernel.org/all/20221005004154.83502-1-gshan@xxxxxxxxxx/
v4: https://lore.kernel.org/kvmarm/20220927005439.21130-1-gshan@xxxxxxxxxx/
v3: https://lore.kernel.org/r/20220922003214.276736-1-gshan@xxxxxxxxxx
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
=========
v6:
* Add CONFIG_HAVE_KVM_DIRTY_RING_WITH_BITMAP, for arm64
to advertise KVM_CAP_DIRTY_RING_WITH_BITMAP in
PATCH[v6 3/8] (Oliver/Peter)
* Add helper kvm_dirty_ring_exclusive() to check if
traditional bitmap-based dirty log tracking is
exclusive to dirty-ring in PATCH[v6 3/8] (Peter)
* Enable KVM_CAP_DIRTY_RING_WITH_BITMAP in PATCH[v6 5/8] (Gavin)
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 (8):
KVM: x86: Introduce KVM_REQ_RING_SOFT_FULL
KVM: x86: Move declaration of kvm_cpu_dirty_log_size() to
kvm_dirty_ring.h
KVM: Add support for using dirty ring in conjunction with bitmap
KVM: arm64: Enable ring-based dirty memory tracking
KVM: selftests: Enable KVM_CAP_DIRTY_LOG_RING_WITH_BITMAP if possible
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 | 2 +
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 | 15 +++---
include/linux/kvm_host.h | 2 +
include/uapi/linux/kvm.h | 1 +
tools/testing/selftests/kvm/dirty_log_test.c | 53 ++++++++++++++------
tools/testing/selftests/kvm/lib/kvm_util.c | 5 +-
virt/kvm/Kconfig | 8 +++
virt/kvm/dirty_ring.c | 24 ++++++++-
virt/kvm/kvm_main.c | 34 +++++++++----
14 files changed, 132 insertions(+), 52 deletions(-)
--
2.23.0
_______________________________________________
kvmarm mailing list
kvmarm@xxxxxxxxxxxxxxxxxxxxx
https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
