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    Subject[PATCH v1 0/3] Enable PV qspinlock for Hyper-V
    Date
    This patch adds the necessary Hyper-V specific code to allow
    PV qspinlock work on Hyper-V.

    In wait callback function, read HV_X64_MSR_GUEST_IDLE MSR
    to trigger the guest's transition to the idle power state
    which can be exited by an IPI even if IF flag is disabled.
    Beside that, make HVCALL_NOTIFY_LONG_SPIN_WAIT hypervall to
    notify the hypervisor that the calling virtual processor is
    attempting to acquire a resource that is potentially held
    by another virtual processor within the same partition. This
    scheduling hint improves the scalability of partitions with
    more than one virtual processor.

    In kick callback function, just send platform IPI to make
    waiting vcpu exit idle state.

    In vcpu_is_preempted callback function, return false directly
    because Hyper-V does not provide such interface so far.


    Cc: "K. Y. Srinivasan" <kys@microsoft.com>
    Cc: Haiyang Zhang <haiyangz@microsoft.com>
    Cc: Stephen Hemminger <sthemmin@microsoft.com>
    Cc: Jonathan Corbet <corbet@lwn.net>

    Yi Sun (3):
    X86/Hyper-V: Add Guest IDLE MSR support
    locking/pvqspinlock, hv: Enable PV qspinlock for Hyper-V
    hv: add description for hv_nopvspin

    Documentation/admin-guide/kernel-parameters.txt | 5 ++
    arch/x86/hyperv/Makefile | 2 +-
    arch/x86/hyperv/hv_spinlock.c | 99 +++++++++++++++++++++++++
    arch/x86/include/asm/hyperv-tlfs.h | 5 ++
    arch/x86/include/asm/mshyperv.h | 3 +
    arch/x86/kernel/smpboot.c | 2 +
    6 files changed, 115 insertions(+), 1 deletion(-)
    create mode 100644 arch/x86/hyperv/hv_spinlock.c

    --
    1.9.1

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