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

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Message-ID: <565EFD0E.4020501@citrix.com>
Date:	Wed, 2 Dec 2015 14:15:42 +0000
From:	David Vrabel <david.vrabel@...rix.com>
To:	Sander Eikelenboom <linux@...elenboom.it>,
	<boris.ostrovsky@...cle.com>, <david.vrabel@...rix.com>
CC:	<linux-kernel@...r.kernel.org>, <xen-devel@...ts.xen.org>
Subject: Re: [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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