forked from luck/tmp_suning_uos_patched
24647e0a39
kvm_vcpu_ioctl_get_lapic (implements KVM_GET_LAPIC ioctl) does a bulk copy of the LAPIC registers but must take into account that the one-shot and periodic timer current count register is computed upon reads and is not present in register state. When restoring LAPIC state (e.g. after migration), restart timers from their their current count values at time of save. Note: When a one-shot timer expires, the code in arch/x86/kvm/lapic.c does not zero the value of the LAPIC initial count register (emulating HW behavior). If no other timer is run and pending prior to a subsequent KVM_GET_LAPIC call, the returned register set will include the expired one-shot initial count. On a subsequent KVM_SET_LAPIC call the code will see a non-zero initial count and start a new one-shot timer using the expired timer's count. This is a prior existing bug and will be addressed in a separate patch. Thanks to jmattson@google.com for this find. Signed-off-by: Peter Shier <pshier@google.com> Reviewed-by: Jim Mattson <jmattson@google.com> Reviewed-by: Wanpeng Li <wanpengli@tencent.com> Message-Id: <20181010225653.238911-1-pshier@google.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> |
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