This series intends to support dirty ring for live migration. The dirty ring use discrete buffer to track dirty pages. For ARM64, the speciality is to use backup bitmap to track dirty pages when there is no-running-vcpu context. It's known that the backup bitmap needs to be synchronized when KVM device "kvm-arm-gicv3" or "arm-its-kvm" has been enabled. The backup bitmap is collected in the last stage of migration.
PATCH[1] Synchronize linux-headers for dirty ring PATCH[2-3] Introduce indicator of the last stage migration and pass it all the way down PATCH[4-5] Introduce secondary bitmap, corresponding to the backup bitmap PATCH[6-8] Enable dirty ring for hw/arm/virt Testing ======= (1) kvm-unit-tests/its-pending-migration and kvm-unit-tests/its-migration with dirty ring or normal dirty page tracking mechanism. All test cases passed. QEMU=./qemu.main/build/qemu-system-aarch64 ACCEL=kvm \ ./its-pending-migration QEMU=./qemu.main/build/qemu-system-aarch64 ACCEL=kvm \ ./its-migration QEMU=./qemu.main/build/qemu-system-aarch64 ACCEL=kvm,dirty-ring-size=65536 \ ./its-pending-migration QEMU=./qemu.main/build/qemu-system-aarch64 ACCEL=kvm,dirty-ring-size=65536 \ ./its-migration (2) Combinations of migration, post-copy migration, e1000e and virtio-net devices. All test cases passed. -netdev tap,id=net0,script=/etc/qemu-ifup,downscript=/etc/qemu-ifdown \ -device e1000e,bus=pcie.5,netdev=net0,mac=52:54:00:f1:26:a0 -netdev tap,id=vnet0,script=/etc/qemu-ifup,downscript=/etc/qemu-ifdown \ -device virtio-net-pci,bus=pcie.6,netdev=vnet0,mac=52:54:00:f1:26:b0 Gavin Shan (8): linux-headers: Update for dirty ring memory: Add last stage indicator to global dirty log synchronization migration: Add last stage indicator to global dirty log synchronization kvm: Introduce secondary dirty bitmap kvm: Synchronize secondary bitmap in last stage kvm: Add helper kvm_dirty_ring_init() hw/arm/virt: Enable backup bitmap for dirty ring kvm: Enable dirty ring for arm64 accel/kvm/kvm-all.c | 138 ++++++++++++++++++++++++---------- hw/arm/virt.c | 26 +++++++ include/exec/memory.h | 5 +- include/sysemu/kvm_int.h | 1 + linux-headers/asm-arm64/kvm.h | 1 + linux-headers/linux/kvm.h | 2 + migration/dirtyrate.c | 4 +- migration/ram.c | 20 ++--- softmmu/memory.c | 10 +-- target/arm/kvm64.c | 25 ++++++ target/arm/kvm_arm.h | 12 +++ 11 files changed, 185 insertions(+), 59 deletions(-) -- 2.23.0