Messages in this thread | | | Date | Thu, 15 Nov 2018 14:39:06 +0000 | From | Andre Przywara <> | Subject | Re: [PATCH] kvm: arm/arm64 : fix vm's hanging at startup time |
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On Thu, 15 Nov 2018 23:14:08 +0800 Peng Hao <peng.hao2@zte.com.cn> wrote:
Hi,
> When virtual machine starts, hang up.
I take it you mean the *guest* hangs? Because it doesn't get a timer interrupt?
> The kernel version of guest > is 4.16. Host support vgic_v3.
Your host kernel is something recent, I guess?
> It was mainly due to the incorrect vgic_irq's(intid=27) group value > during injection interruption. when kvm_vgic_vcpu_init is called, > dist is not initialized at this time. Unable to get vgic V3 or V2 > correctly, so group is not set.
Mmh, that shouldn't happen with (v)GICv3. Do you use QEMU (which version?) or some other userland tool?
> group is setted to 1 when vgic_mmio_write_group is invoked at some > time. > when irq->group=0 (intid=27), No ICH_LR_GROUP flag was set and > interrupt injection failed. > > Signed-off-by: Peng Hao <peng.hao2@zte.com.cn> > --- > virt/kvm/arm/vgic/vgic-v3.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/virt/kvm/arm/vgic/vgic-v3.c b/virt/kvm/arm/vgic/vgic-v3.c > index 9c0dd23..d101000 100644 > --- a/virt/kvm/arm/vgic/vgic-v3.c > +++ b/virt/kvm/arm/vgic/vgic-v3.c > @@ -198,7 +198,7 @@ void vgic_v3_populate_lr(struct kvm_vcpu *vcpu, > struct vgic_irq *irq, int lr) if (vgic_irq_is_mapped_level(irq) && > (val & ICH_LR_PENDING_BIT)) irq->line_level = false; > > - if (irq->group) > + if (model == KVM_DEV_TYPE_ARM_VGIC_V3)
This is not the right fix, not only because it basically reverts the GICv3 part of 87322099052 (KVM: arm/arm64: vgic: Signal IRQs using their configured group).
Can you try to work out why kvm_vgic_vcpu_init() is apparently called before dist->vgic_model is set, also what value it has? If I understand the code correctly, that shouldn't happen for a GICv3.
Cheers, Andre.
> val |= ICH_LR_GROUP; > > val |= (u64)irq->priority << ICH_LR_PRIORITY_SHIFT;
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