Messages in this thread | | | Subject | Re: [PATCH v19 6/7] KVM: arm64: Add support for the KVM PTP service | From | Zenghui Yu <> | Date | Sat, 17 Apr 2021 16:59:39 +0800 |
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On 2021/3/30 22:54, Marc Zyngier wrote: > +PTP_KVM support for arm/arm64 > +============================= > + > +PTP_KVM is used for high precision time sync between host and guests. > +It relies on transferring the wall clock and counter value from the > +host to the guest using a KVM-specific hypercall. > + > +* ARM_SMCCC_HYP_KVM_PTP_FUNC_ID: 0x86000001
Per include/linux/arm-smccc.h, this should be ARM_SMCCC_VENDOR_HYP_KVM_PTP_FUNC_ID.
> + > +This hypercall uses the SMC32/HVC32 calling convention: > + > +ARM_SMCCC_HYP_KVM_PTP_FUNC_ID
ditto
> + ============= ========== ========== > + Function ID: (uint32) 0x86000001 > + Arguments: (uint32) KVM_PTP_VIRT_COUNTER(0) > + KVM_PTP_PHYS_COUNTER(1)
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