linux-kernel - Re: [RFC PATCH 0/3] Avoid soft lockup message when KVM is stopped by host

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Message-ID: <20110804162902.GA27692@amt.cnet>
Date:	Thu, 4 Aug 2011 13:29:02 -0300
From:	Marcelo Tosatti <mtosatti@...hat.com>
To:	Eric B Munson <emunson@...bm.net>
Cc:	kvm@...r.kernel.org, kvm-ia64@...r.kernel.org,
	kvm-ppc@...r.kernel.org, avi@...hat.com, riel@...hat.com,
	glommer@...hat.com, linux-kernel@...r.kernel.org,
	aliguori@...ibm.com, raharper@...ibm.com
Subject: Re: [RFC PATCH 0/3] Avoid soft lockup message when KVM is stopped by
 host

On Wed, Aug 03, 2011 at 10:24:58AM -0400, Eric B Munson wrote:
> This set is just a rough first pass at avoiding soft lockup warnings when a host
> pauses the execution of a guest.  A flag is set by the host in the shared page
> used for the pvclock when the host goes to stop the guest.  When the guest
> resumes and detects a soft lockup, this flag is checked and cleared and the soft
> lockup message is skipped.
> 
> This currently breaks the build for non-x86 architectures but part of what I am
> looking for here is how to go about adding the function stubs for everything
> else.

To fix this, you can save/restore the offset added to kvmclock on
vmstop/vmstart. See hw/kvmclock.c in the qemu source tree.

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