On 2020/10/19 下午5:06, Zhenzhong Duan wrote:
If Post interrupt is disabled due to hardware limit or forcely disabled
by "intremap=nopost" parameter, return -EINVAL so that the legacy mode IRQ
isn't registered as IRQ bypass producer.
Is there any side effect if it was still registered?
With this change, below message is printed:
"vfio-pci 0000:db:00.0: irq bypass producer (token 0000000060c8cda5) registration fails: -22"
I may miss something, but the patch only touches vhost-vDPA instead of VFIO?
Thanks
..which also hints us if a vfio or vdpa device works in PI mode or legacy
remapping mode.
Add a print to vdpa code just like what vfio_msi_set_vector_signal() does.
Signed-off-by: Zhenzhong Duan <zhenzhong.duan@xxxxxxxxx>
---
arch/x86/kvm/svm/avic.c | 3 +--
arch/x86/kvm/vmx/vmx.c | 5 ++---
drivers/vhost/vdpa.c | 5 +++++
3 files changed, 8 insertions(+), 5 deletions(-)
diff --git a/arch/x86/kvm/svm/avic.c b/arch/x86/kvm/svm/avic.c
index ac830cd..316142a 100644
--- a/arch/x86/kvm/svm/avic.c
+++ b/arch/x86/kvm/svm/avic.c
@@ -814,7 +814,7 @@ int svm_update_pi_irte(struct kvm *kvm, unsigned int host_irq,
if (!kvm_arch_has_assigned_device(kvm) ||
!irq_remapping_cap(IRQ_POSTING_CAP))
- return 0;
+ return ret;
pr_debug("SVM: %s: host_irq=%#x, guest_irq=%#x, set=%#x\n",
__func__, host_irq, guest_irq, set);
@@ -899,7 +899,6 @@ int svm_update_pi_irte(struct kvm *kvm, unsigned int host_irq,
}
}
- ret = 0;
out:
srcu_read_unlock(&kvm->irq_srcu, idx);
return ret;
diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index f0a9954..1fed6d6 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -7716,12 +7716,12 @@ static int vmx_update_pi_irte(struct kvm *kvm, unsigned int host_irq,
struct kvm_lapic_irq irq;
struct kvm_vcpu *vcpu;
struct vcpu_data vcpu_info;
- int idx, ret = 0;
+ int idx, ret = -EINVAL;
if (!kvm_arch_has_assigned_device(kvm) ||
!irq_remapping_cap(IRQ_POSTING_CAP) ||
!kvm_vcpu_apicv_active(kvm->vcpus[0]))
- return 0;
+ return ret;
idx = srcu_read_lock(&kvm->irq_srcu);
irq_rt = srcu_dereference(kvm->irq_routing, &kvm->irq_srcu);
@@ -7787,7 +7787,6 @@ static int vmx_update_pi_irte(struct kvm *kvm, unsigned int host_irq,
}
}
- ret = 0;
out:
srcu_read_unlock(&kvm->irq_srcu, idx);
return ret;
diff --git a/drivers/vhost/vdpa.c b/drivers/vhost/vdpa.c
index 62a9bb0..b20060a 100644
--- a/drivers/vhost/vdpa.c
+++ b/drivers/vhost/vdpa.c
@@ -107,6 +107,11 @@ static void vhost_vdpa_setup_vq_irq(struct vhost_vdpa *v, u16 qid)
vq->call_ctx.producer.token = vq->call_ctx.ctx;
vq->call_ctx.producer.irq = irq;
ret = irq_bypass_register_producer(&vq->call_ctx.producer);
+ if (unlikely(ret))
+ dev_info(&vdpa->dev,
+ "irq bypass producer (token %p) registration fails: %d\n",
+ vq->call_ctx.producer.token, ret);
+
spin_unlock(&vq->call_ctx.ctx_lock);
}
