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SubjectRe: [PATCH 0/4 V13] Avoid soft lockup message when KVM is stopped by host
On Wed, 08 Feb 2012, 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.
>
> It was attempted to solve this in Qemu, but the side effects of saving and
> restoring the clock and tsc for each vcpu put the wall clock of the guest behind
> by the amount of time of the pause. This forces a guest to have ntp running
> in order to keep the wall clock accurate.

Avi,

Is this set fit for merging or is there something else you want changed?

Eric

>
> Cc: mingo@redhat.com
> Cc: hpa@zytor.com
> Cc: ryanh@linux.vnet.ibm.com
> Cc: aliguori@us.ibm.com
> Cc: mtosatti@redhat.com
> Cc: kvm@vger.kernel.org
> Cc: linux-arch@vger.kernel.org
> Cc: x86@kernel.org
> Cc: linux-kernel@vger.kernel.org
>
> Eric B Munson (4):
> Add flag to indicate that a vm was stopped by the host
> Add functions to check if the host has stopped the vm
> Add ioctl for KVM_KVMCLOCK_CTRL
> Add check for suspended vm in softlockup detector
>
> Documentation/virtual/kvm/api.txt | 13 +++++++++++++
> arch/ia64/include/asm/kvm_para.h | 5 +++++
> arch/powerpc/include/asm/kvm_para.h | 5 +++++
> arch/s390/include/asm/kvm_para.h | 5 +++++
> arch/x86/include/asm/kvm_para.h | 8 ++++++++
> arch/x86/include/asm/pvclock-abi.h | 1 +
> arch/x86/kernel/kvmclock.c | 21 +++++++++++++++++++++
> arch/x86/kvm/x86.c | 22 ++++++++++++++++++++++
> include/asm-generic/kvm_para.h | 14 ++++++++++++++
> include/linux/kvm.h | 3 +++
> kernel/watchdog.c | 12 ++++++++++++
> 11 files changed, 109 insertions(+), 0 deletions(-)
> create mode 100644 include/asm-generic/kvm_para.h
>
> --
> 1.7.5.4
>
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