Changes from V4: Rename KVM_GUEST_PAUSED to KVMCLOCK_GUEST_PAUSED Add description of KVMCLOCK_GUEST_PAUSED ioctl to api.txt Changes from V3: Include CC's on patch 3 Drop clear flag ioctl and have the watchdog clear the flag when it is reset Changes from V2: A new kvm functions defined in kvm_para.h, the only change to pvclock is the initial flag definition Changes from V1: (Thanks Marcelo) Host code has all been moved to arch/x86/kvm/x86.c KVM_PAUSE_GUEST was renamed to KVM_GUEST_PAUSED 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. Cc: mingo@xxxxxxxxxx Cc: hpa@xxxxxxxxx Cc: arnd@xxxxxxxx Cc: ryanh@xxxxxxxxxxxxxxxxxx Cc: aliguori@xxxxxxxxxx Cc: mtosatti@xxxxxxxxxx Cc: jeremy.fitzhardinge@xxxxxxxxxx Cc: levinsasha928@xxxxxxxxx Cc: Jan Kiszka <jan.kiszka@xxxxxxxxxxx> Cc: kvm@xxxxxxxxxxxxxxx Cc: linux-arch@xxxxxxxxxxxxxxx Cc: x86@xxxxxxxxxx Cc: linux-kernel@xxxxxxxxxxxxxxx Eric B Munson (5): 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 KVMCLOCK_GUEST_STOPPED Add generic stubs for kvm stop check functions Add check for suspended vm in softlockup detector Documentation/virtual/kvm/api.txt | 12 ++++++++++++ arch/x86/include/asm/kvm_host.h | 2 ++ arch/x86/include/asm/kvm_para.h | 1 + arch/x86/include/asm/pvclock-abi.h | 1 + arch/x86/kernel/kvmclock.c | 21 +++++++++++++++++++++ arch/x86/kvm/x86.c | 20 ++++++++++++++++++++ include/asm-generic/kvm_para.h | 14 ++++++++++++++ include/linux/kvm.h | 2 ++ kernel/watchdog.c | 12 ++++++++++++ 9 files changed, 85 insertions(+), 0 deletions(-) create mode 100644 include/asm-generic/kvm_para.h -- 1.7.5.4 -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
