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SubjectRe: [Xen-devel] linux 4.4 Regression: 100% cpu usage on idle pv guest under Xen with single vcpu.
On 28/11/15 15:47, Sander Eikelenboom wrote:
>
> -rtc_cmos rtc_cmos: hctosys: unable to read the hardware clock
> +hctosys: unable to open rtc device (rtc0)
>
> -genirq: Flags mismatch irq 8. 00000000 (hvc_console) vs. 00000000 (rtc0)
> -hvc_open: request_irq failed with rc -16.

I have reproduced this issue. We really shouldn't have an RTC device in
a PV guest and I think this irq conflict breaks hvc0.

David


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