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@xxxxxxxxxx
Cc: hpa@xxxxxxxxx
Cc: ryanh@xxxxxxxxxxxxxxxxxx
Cc: aliguori@xxxxxxxxxx
Cc: mtosatti@xxxxxxxxxx
Cc: kvm@xxxxxxxxxxxxxxx
Cc: linux-arch@xxxxxxxxxxxxxxx
Cc: x86@xxxxxxxxxx
Cc: linux-kernel@xxxxxxxxxxxxxxx
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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