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KVM: arm64: timers: Use a per-vcpu, per-timer accumulator for fractional ns

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Instead of accumulating the fractional ns value generated every time
we compute a ns delta in a global variable, use a per-vcpu, per-timer
variable. This keeps the fractional ns local to the timer instead of
contributing to any odd, unrelated timer.

Reviewed-by: Colton Lewis <coltonlewis@google.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20230330174800.2677007-2-maz@kernel.org
This commit is contained in:
Marc Zyngier 2023-03-30 18:47:41 +01:00
parent e8d018dd02
commit 0d0ae656b7
2 changed files with 2 additions and 1 deletions
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2
arch/arm64/kvm/arch_timer.c
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@ -212,7 +212,7 @@ static u64 kvm_counter_compute_delta(struct arch_timer_context *timer_ctx,
ns = cyclecounter_cyc2ns(timecounter->cc,
val - now,
timecounter->mask,
&timecounter->frac);
&timer_ctx->ns_frac);
return ns;
}

1
include/kvm/arm_arch_timer.h
View file

@ -44,6 +44,7 @@ struct arch_timer_context {
/* Emulated Timer (may be unused) */
struct hrtimer hrtimer;
u64 ns_frac;
/* Offset for this counter/timer */
struct arch_timer_offset offset;