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pvclock: Add vDSO support

Description

pvclock: Add vDSO support

Add vDSO support for timekeeping devices that support the KVM/XEN
paravirtual clock API.

Also, expose, in the userspace-accessible '<machine/pvclock.h>',
definitions that will be needed by 'libc' to support
'VDSO_TH_ALGO_X86_PVCLK'.

Sponsored by: Juniper Networks, Inc.
Sponsored by: Klara, Inc.
Reviewed by: kib
Differential Revision: https://reviews.freebsd.org/D31418

(cherry picked from commit d4b2d3035a23d5dc468d41151487a8299bf45cdc)

Details

Provenance
adam_fenn.ioAuthored on Aug 7 2021, 8:10 PM
kibCommitted on Oct 12 2021, 4:01 PM
Reviewer
kib
Differential Revision
D31418: pvclock: Add vDSO support
Parents
rG6fa88a627d5e: kvm_clock: KVM paravirtual clock support
Branches
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