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_VENDOR_HYP_KVM_PTP_FUNC_ID¶
Retrieve current time information for the specific counter. There are no endianness restrictions.
| Presence: | Optional | ||
| Calling convention: | HVC32 | ||
| Function ID: | (uint32) | 0x86000001 | |
| Arguments: | (uint32) | R1 | 
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| Return Values: | (int32) | R0 | 
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| (uint32) | R1 | Lower 32 bits of wall clock time | |
| (uint32) | R2 | Upper 32 bits of counter | |
| (uint32) | R3 | Lower 32 bits of counter | |