Jeremy Fitzhardinge wrote:
Anthony Liguori wrote:
+static cycle_t read_hyper(void)
+{
+ struct timespec now;
+ int ret;
+
+ ret = kvm_hypercall(KVM_HYPERCALL_GET_KTIME, (u32)&now, 0, 0, 0);
+ WARN_ON(ret);
+
+ return now.tv_nsec + now.tv_sec * (cycles_t)1e9;
Hm, use of FP looks pretty odd. I guess its OK to assume the compiler
will completely remove all the FP stuff at compile time. Or you could
use NSEC_PER_SEC.
Agreed.
+}
+
+static struct clocksource clocksource_hyper = {
+ .name = "hyper",
+ .rating = 200,
We should probably standardize on this. I guess that if you're in a
paravirt environment, and there's a paravirt clocksource, that would
always be the best clocksource to use.
+ .read = read_hyper,
+ .mask = CLOCKSOURCE_MASK(64),
+ .mult = 1,
+ .shift = 0,
It would be better to use a scale and shift here, so that adjtime has
something to work with when warping time.
Okay. I may remove this patch from the patch series and attempt to sit
down next week and work out something more complete that also implements
stolen time accounting.
Regards,
Anthony Liguori
J
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