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In preparation for a follow-up revision wherein kvmclock may export timekeeping info to userspace even in the absence of AMDID_RDTSCP, fall back to using rdtsc when rdtscp isn't available. This mimics pvclock_read_time_info() in the kernel. Reviewed by: kib Tested by: Shrikanth R Kamath <kshrikanth@juniper.net> MFC after: 2 weeks Sponsored by: Klara, Inc. Sponsored by: Juniper Networks, Inc. Differential Revision: https://reviews.freebsd.org/D38341 |
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