Re: [PATCH] kvm: arm/arm64 : fix vm's hanging at startup time

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



Hi Peng,

On 15/11/18 15:14, Peng Hao wrote:
When virtual machine starts, hang up. The kernel version of guest
is 4.16. Host support vgic_v3.

I don't understand the issue here. the vgic_irq->group field does not exist in 4.16 (neither in the first nor the last version). Nor does the line you are modifying.

Both exist in mainline, but what you are mentioning shouldn't be an issue in mainline since vgic_irq->group gets initialized in kvm_vgic_vcpu_init for SGIs and PPIs (i.e. intid < 32) which includes your interrupt.

Cheers,

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.
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@xxxxxxxxxx>
---
  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)
  		val |= ICH_LR_GROUP;
val |= (u64)irq->priority << ICH_LR_PRIORITY_SHIFT;


--
Julien Thierry
_______________________________________________
kvmarm mailing list
kvmarm@xxxxxxxxxxxxxxxxxxxxx
https://lists.cs.columbia.edu/mailman/listinfo/kvmarm



[Index of Archives]     [Linux KVM]     [Spice Development]     [Libvirt]     [Libvirt Users]     [Linux USB Devel]     [Linux Audio Users]     [Yosemite News]     [Linux Kernel]     [Linux SCSI]

  Powered by Linux