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

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On 08/03/2011 05:24 PM, 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.

While this will cover the case were the host stops a guest, there will be other plain cases where the host is just over committed and will cause a softlockup false positive on the guest.

Softlockup should use stolen time that makes use of the guest running info would cover both cases


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.

Eric B Munson (3):
   Add flag to indicate that a vm was stopped by the host
   Add functions to check if the host has stopped the vm
   Add check for suspended vm in softlockup detector

  arch/x86/include/asm/pvclock-abi.h |    1 +
  arch/x86/include/asm/pvclock.h     |    3 +++
  arch/x86/kernel/kvmclock.c         |   12 ++++++++++++
  kernel/watchdog.c                  |   11 +++++++++++
  4 files changed, 27 insertions(+), 0 deletions(-)


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