On Wed, Nov 28, 2018 at 02:45:15PM +0000, Steven Price wrote: > This series add support for paravirtualized time for Arm64 guests and > KVM hosts following the specification in Arm's document DEN 0057A: > > https://developer.arm.com/docs/den0057/a Hi Steven, As that specification is still a draft, then I guess this series is an RFC. I just wanted to point that out, as I believe that tag should be used in future postings until the spec is approved. Regarding the spec, my understanding from kvm forum was that there was still a need to explain why kvmclock, or an extension to kvmclock, is insufficient. If there hasn't been anything written up about that yet, would you mind doing so? > > It implements support for Live Physical Time (LPT) which provides the > guest with a method to derive a stable counter of time during which the > guest is executing even when the guest is being migrated between hosts > with different physical counter frequencies. Intel has TSC scaling. Is there any reason Arm is proposing a PV solution instead of adding a similar virt extension? Thanks, drew > > It also implements support for stolen time, allowing the guest to > identify time when it is forcibly not executing. > > Patch 1 provides some documentation > Patches 2-4, 8 and 11 provide some refactoring of existing code > Patch 5 implements the new PV_FEATURES discovery mechanism > Patches 6-7 implement live physical time > Patches 9-10 implement stolen time > Patch 12 adds the 'PV_TIME' device for user space to enable the features > > Christoffer Dall (2): > KVM: arm/arm64: Factor out hypercall handling from PSCI code > KVM: Export mark_page_dirty_in_slot > > Steven Price (10): > KVM: arm64: Document PV-time interface > arm/arm64: Provide a wrapper for SMCCC 1.1 calls > arm/arm64: Make use of the SMCCC 1.1 wrapper > KVM: arm64: Implement PV_FEATURES call > KVM: arm64: Support Live Physical Time reporting > clocksource: arm_arch_timer: Use paravirtualized LPT > KVM: arm64: Support stolen time reporting via shared page > arm64: Retrieve stolen time as paravirtualized guest > KVM: Allow kvm_device_ops to be const > KVM: arm64: Provide a PV_TIME device to user space > > Documentation/virtual/kvm/arm/pvtime.txt | 169 ++++++++++++++ > arch/arm/kvm/Makefile | 2 +- > arch/arm/kvm/handle_exit.c | 2 +- > arch/arm/mm/proc-v7-bugs.c | 46 ++-- > arch/arm64/include/asm/arch_timer.h | 32 ++- > arch/arm64/include/asm/kvm_host.h | 16 ++ > arch/arm64/include/asm/kvm_mmu.h | 2 + > arch/arm64/include/asm/pvclock-abi.h | 32 +++ > arch/arm64/include/uapi/asm/kvm.h | 8 + > arch/arm64/kernel/Makefile | 1 + > arch/arm64/kernel/cpu_errata.c | 47 +--- > arch/arm64/kernel/cpuinfo.c | 2 +- > arch/arm64/kernel/kvm.c | 156 +++++++++++++ > arch/arm64/kvm/Kconfig | 1 + > arch/arm64/kvm/Makefile | 2 + > arch/arm64/kvm/handle_exit.c | 4 +- > drivers/clocksource/arm_arch_timer.c | 176 ++++++++++++++- > include/kvm/arm_arch_timer.h | 2 + > include/kvm/arm_hypercalls.h | 44 ++++ > include/kvm/arm_psci.h | 2 +- > include/kvm/arm_pv.h | 28 +++ > include/linux/arm-smccc.h | 45 ++++ > include/linux/cpuhotplug.h | 1 + > include/linux/kvm_host.h | 5 +- > include/linux/kvm_types.h | 2 + > include/uapi/linux/kvm.h | 2 + > virt/kvm/arm/arm.c | 25 +- > virt/kvm/arm/hypercalls.c | 276 +++++++++++++++++++++++ > virt/kvm/arm/mmu.c | 44 ++++ > virt/kvm/arm/psci.c | 76 +------ > virt/kvm/arm/pvtime.c | 243 ++++++++++++++++++++ > virt/kvm/kvm_main.c | 12 +- > 32 files changed, 1348 insertions(+), 157 deletions(-) > create mode 100644 Documentation/virtual/kvm/arm/pvtime.txt > create mode 100644 arch/arm64/include/asm/pvclock-abi.h > create mode 100644 arch/arm64/kernel/kvm.c > create mode 100644 include/kvm/arm_hypercalls.h > create mode 100644 include/kvm/arm_pv.h > create mode 100644 virt/kvm/arm/hypercalls.c > create mode 100644 virt/kvm/arm/pvtime.c > > -- > 2.19.2 > > _______________________________________________ > kvmarm mailing list > kvmarm@xxxxxxxxxxxxxxxxxxxxx > https://lists.cs.columbia.edu/mailman/listinfo/kvmarm _______________________________________________ kvmarm mailing list kvmarm@xxxxxxxxxxxxxxxxxxxxx https://lists.cs.columbia.edu/mailman/listinfo/kvmarm
