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Re: [Xen-devel] linux 4.4 Regression: 100% cpu usage on idle pv guest under Xen with single vcpu.

Started byDavid Vrabel <david.vrabel@citrix.com>
First post2015-12-02 15:20 +0100
Last post2015-12-02 15:20 +0100
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  Re: [Xen-devel] linux 4.4 Regression: 100% cpu usage on idle pv guest  under Xen with single vcpu. David Vrabel <david.vrabel@citrix.com> - 2015-12-02 15:20 +0100

#1281857 — Re: [Xen-devel] linux 4.4 Regression: 100% cpu usage on idle pv guest under Xen with single vcpu.

FromDavid Vrabel <david.vrabel@citrix.com>
Date2015-12-02 15:20 +0100
SubjectRe: [Xen-devel] linux 4.4 Regression: 100% cpu usage on idle pv guest under Xen with single vcpu.
Message-ID<qBgqf-8gM-33@gated-at.bofh.it>
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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