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SubjectRe: [PATCH 0/4 V15] Avoid soft lockup message when KVM is stopped by host
On Sun, 19 Feb 2012 21:22:53 -0500, Eric B Munson wrote:
> Changes from V14:
> Update documentation for the pvclock api

... snip

>
> 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 version acceptable for merging? I'd really like this to go in
for the 3.4 merge window.

Thanks,
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 | 20 ++++++++++++++++++++
> Documentation/virtual/kvm/msr.txt | 4 ++++
> 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 ++++++++++++
> 12 files changed, 120 insertions(+), 0 deletions(-)
> create mode 100644 include/asm-generic/kvm_para.h



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