linux-kernel - Re: [PATCH 0/5 V5] Avoid soft lockup message when KVM is stopped by host

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Message-ID: <4EE9E023.4000904@redhat.com>
Date:	Thu, 15 Dec 2011 13:55:15 +0200
From:	Avi Kivity <avi@...hat.com>
To:	Amit Shah <amit.shah@...hat.com>
CC:	Eric B Munson <emunson@...bm.net>, mingo@...hat.com, hpa@...or.com,
	arnd@...db.de, ryanh@...ux.vnet.ibm.com, aliguori@...ibm.com,
	mtosatti@...hat.com, jeremy.fitzhardinge@...rix.com,
	levinsasha928@...il.com, Jan Kiszka <jan.kiszka@...mens.com>,
	kvm@...r.kernel.org, linux-arch@...r.kernel.org, x86@...nel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/5 V5] Avoid soft lockup message when KVM is stopped
 by host

On 12/08/2011 01:34 PM, Amit Shah wrote:
> On (Mon) 05 Dec 2011 [15:18:59], Eric B Munson wrote:
> > When a guest kernel is stopped by the host hypervisor it can look like a soft
> > lockup to the guest kernel.  This false warning can mask later soft lockup
> > warnings which may be real.  This patch series adds a method for a host
> > hypervisor to communicate to a guest kernel that it is being stopped.  The
> > final patch in the series has the watchdog check this flag when it goes to
> > issue a soft lockup warning and skip the warning if the guest knows it was
> > stopped.
>
> Guest S4 would need similar treatment, and I think the code in the two
> approaches can be shared.  Just something to consider.
>

Why does S4 need any treatment?  The guest is aware that it's sleeping,
unlike the other cases treated here.

-- 
error compiling committee.c: too many arguments to function

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