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

Marcelo Tosatti
2011-08-04T16:30:04Z

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.