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@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 | 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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