On Fri, 2026-05-15 at 12:19 -0700, Sean Christopherson wrote: > Register the Hyper-V reference counter (refcounter) callbacks for saving > and restoring its PV sched_clock, if and only if the refcounter is > actually being used for sched_clock. Currently, Hyper-V overrides the > save/restore hooks if the reference TSC available, whereas the Hyper-V > refcounter code only overrides sched_clock if the reference TSC is > available *and* it's not invariant. The flaw is effectively papered over > by invoking the "old" save/restore callbacks as part of save/restore, but > that's unnecessary and fragile. > > To avoid introducing more complexity, and to allow for additional cleanups > of the PV sched_clock code, move the save/restore hooks and logic into > hyperv_timer.c and simply wire up the hooks when overriding sched_clock > itself. > > Note, while the Hyper-V refcounter code is intended to be architecture > neutral, CONFIG_PARAVIRT is firmly x86-only, i.e. adding a small amount of > x86 specific code (which will be reduced in future cleanups) doesn't > meaningfully pollute generic code. > > Reviewed-by: Michael Kelley <[email protected]> > Tested-by: Michael Kelley <[email protected]> > Signed-off-by: Sean Christopherson <[email protected]>
Reviewed-by: David Woodhouse <[email protected]>
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