This patch adds support for ARMv7 dirty page logging. Some functions of dirty page logging have been split to generic and arch specific implementations, details below. Dirty page logging is one of serveral features required for live migration, live migration has been tested for ARMv7. Testing: - QEMU machvirt, VExpress - Exynos 5440, FastModels - lmbench + dirty guest memory cycling. - ARMv8 Foundation Model/kvmtool - Due to slight overlap in 2nd stage handlers did a basic bringup and memory test. - x86_64 QEMU basic migration on same platform. See https://github.com/mjsmar/arm-migration-howto for details testing and setup (see README). The patch affects armv7,armv8, mips, ia64, powerpc, s390, x86_64. Patch series has been compiled for affected architectures: - x86_64 - defconfig - ia64 - ia64-linux-gcc4.6.3 - defconfig, ia64 Kconfig defines BROKEN worked around that to make sure new changes don't break build. Eventually build breaks due to other reasons. - mips - mips64-linux-gcc4.6.3 - malta_kvm_defconfig - ppc - powerpc64-linux-gcc4.6.3 - pseries_defconfig - s390 - s390x-linux-gcc4.6.3 - defconfig - armv8 - aarch64-linux-gnu-gcc4.8.1 - defconfig ARMv7 Dirty page logging support overivew- - initially write protects VM RAM memory regions - 2nd stage page tables - add support to read dirty page log and again write protect the dirty pages - second stage page table for next pass. - second stage huge page are dissolved into small page tables to keep track of dirty pages at page granularity. Tracking at huge page granularity limits migration to an almost idle system. - In the event migration is canceled, normal behavior is resumed huge pages are rebuilt over time. - At this time reverse mappings are not used to for write protecting of 2nd stage tables. - Future Work o Enable diry memory logging for ARMv8 FM,FVP 9x,juno Changes since previous vesion: - Split patches into generic and architecture specific variants for TLB Flushing and dirty log read (patches 1,2 & 3,4,5,6) - rebased to 3.16.0-rc1 - Applied Christoffers comments. Mario Smarduch (6): KVM: Add architecture-specific TLB flush implementations KVM: Add generic implementation of kvm_vm_ioctl_get_dirty_log arm: KVM: Add ARMv7 API to flush TLBs arm: KVM: Add initial dirty page locking infrastructure arm: KVM: dirty log read write protect support arm: KVM: ARMv7 dirty page logging 2nd stage page fault handling support arch/arm/include/asm/kvm_asm.h | 1 + arch/arm/include/asm/kvm_host.h | 15 +++ arch/arm/include/asm/kvm_mmu.h | 20 ++++ arch/arm/include/asm/pgtable-3level.h | 1 + arch/arm/kvm/Kconfig | 1 + arch/arm/kvm/arm.c | 13 ++- arch/arm/kvm/interrupts.S | 12 +++ arch/arm/kvm/mmu.c | 195 ++++++++++++++++++++++++++++++++-- arch/arm64/include/asm/kvm_host.h | 2 + arch/arm64/kvm/Kconfig | 1 + arch/ia64/include/asm/kvm_host.h | 1 + arch/ia64/kvm/Kconfig | 1 + arch/ia64/kvm/kvm-ia64.c | 2 +- arch/mips/include/asm/kvm_host.h | 1 + arch/mips/kvm/Kconfig | 1 + arch/mips/kvm/mips.c | 2 +- arch/powerpc/include/asm/kvm_host.h | 2 + arch/powerpc/kvm/Kconfig | 1 + arch/powerpc/kvm/book3s.c | 2 +- arch/powerpc/kvm/booke.c | 2 +- arch/s390/include/asm/kvm_host.h | 2 + arch/s390/kvm/Kconfig | 1 + arch/s390/kvm/kvm-s390.c | 2 +- arch/x86/kvm/x86.c | 86 --------------- include/linux/kvm_host.h | 2 + virt/kvm/Kconfig | 6 ++ virt/kvm/kvm_main.c | 94 ++++++++++++++++ 27 files changed, 371 insertions(+), 98 deletions(-) -- 1.8.3.2 -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
