2017-07-30 19:33 GMT+08:00 <peng.hao2@xxxxxxxxxx>:
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>
>
>
>>2017-07-30 18:42 GMT+08:00 <peng.hao2@xxxxxxxxxx>:
>
>>>> 2017-07-31 0:24 GMT+08:00 Peng Hao <peng.hao2@xxxxxxxxxx>:
>>>
>>>> > when SMP VM start, AP may lost INIT because of receiving INIT between
>>>> > kvm_vcpu_ioctl_x86_get/set_vcpu_events.
>>>> >
>>>> > vcpu 0 vcpu 1
>>>> > kvm_vcpu_ioctl_x86_get_vcpu_events
>>>> > events->smi.latched_init=0
>>>> > send INIT to vcpu1
>>>> > set vcpu1's pending_events
>>>> > kvm_vcpu_ioctl_x86_set_vcpu_events
>>>> > events->smi.latched_init == 0
>>>> > clear INIT in pending_events
>>>> > I don't think it need set/clear kernel state according to userspace's
>>>> > info.
>>>> >
>>>> > Signed-off-by: Peng Hao <peng.hao2@xxxxxxxxxx>
>>>> > ---
>>>> > arch/x86/kvm/x86.c | 6 ------
>>>> > 1 file changed, 6 deletions(-)
>>>> >
>>>> > diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
>>>> > index 6c7266f..393a7b7 100644
>>>> > --- a/arch/x86/kvm/x86.c
>>>> > +++ b/arch/x86/kvm/x86.c
>>>> > @@ -3157,12 +3157,6 @@ static int
>>>> > kvm_vcpu_ioctl_x86_set_vcpu_events(struct kvm_vcpu *vcpu,
>>>> > vcpu->arch.hflags |= HF_SMM_INSIDE_NMI_MASK;
>>>> > else
>>>> > vcpu->arch.hflags &= ~HF_SMM_INSIDE_NMI_MASK;
>>>> > - if (lapic_in_kernel(vcpu)) {
>>>> > - if (events->smi.latched_init)
>>>> > - set_bit(KVM_APIC_INIT,
>>>> > &vcpu->arch.apic->pending_events);
>>>
>>>> This is not correct, you will lose the INIT after live migration. I
>>>> just send out another patch to fix it. Thanks for the report.
>>>
>>> yes, you're right. I should modify on qemu not kernel.
>
>>There is a patch here to fix it in kvm, https://lkml.org/lkml/2017/7/30/72
>
>>>
>
> I was affected by sipi, kernel never report valid sipi to user space,
>
> we don't care whether sipi is lost after migration. Why?
Please refer to Paolo's suggestion,
https://www.mail-archive.com/qemu-devel@xxxxxxxxxx/msg464882.html
Regards,
Wanpeng Li
>
>>>> > - else
>>>> > - clear_bit(KVM_APIC_INIT,
>>>> > &vcpu->arch.apic->pending_events);
>>>> > - }
>>>> > }
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