Messages in this thread | | | From | Yi Sun <> | Subject | [PATCH v1 0/3] Enable PV qspinlock for Hyper-V | Date | Thu, 13 Sep 2018 17:13:22 +0800 |
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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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