diff options
| author | Gleb Natapov <gleb@redhat.com> | 2009-02-04 18:28:14 +0300 |
|---|---|---|
| committer | Avi Kivity <avi@redhat.com> | 2009-03-24 12:03:11 +0300 |
| commit | 4925663a079c77d95d8685228ad6675fc5639c8e (patch) | |
| tree | 52e93df78b23a44ed21d015f835688f673dd351a /virt/kvm/irq_comm.c | |
| parent | 452425dbaa1974e9fc489e64a8de46a47b4c2754 (diff) | |
| download | linux-4925663a079c77d95d8685228ad6675fc5639c8e.tar.xz | |
KVM: Report IRQ injection status to userspace.
IRQ injection status is either -1 (if there was no CPU found
that should except the interrupt because IRQ was masked or
ioapic was misconfigured or ...) or >= 0 in that case the
number indicates to how many CPUs interrupt was injected.
If the value is 0 it means that the interrupt was coalesced
and probably should be reinjected.
Signed-off-by: Gleb Natapov <gleb@redhat.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
Diffstat (limited to 'virt/kvm/irq_comm.c')
| -rw-r--r-- | virt/kvm/irq_comm.c | 41 |
1 files changed, 28 insertions, 13 deletions
diff --git a/virt/kvm/irq_comm.c b/virt/kvm/irq_comm.c index 6bc7439eff6e..be8aba791554 100644 --- a/virt/kvm/irq_comm.c +++ b/virt/kvm/irq_comm.c @@ -29,22 +29,24 @@ #include "ioapic.h" -static void kvm_set_pic_irq(struct kvm_kernel_irq_routing_entry *e, - struct kvm *kvm, int level) +static int kvm_set_pic_irq(struct kvm_kernel_irq_routing_entry *e, + struct kvm *kvm, int level) { #ifdef CONFIG_X86 - kvm_pic_set_irq(pic_irqchip(kvm), e->irqchip.pin, level); + return kvm_pic_set_irq(pic_irqchip(kvm), e->irqchip.pin, level); +#else + return -1; #endif } -static void kvm_set_ioapic_irq(struct kvm_kernel_irq_routing_entry *e, - struct kvm *kvm, int level) +static int kvm_set_ioapic_irq(struct kvm_kernel_irq_routing_entry *e, + struct kvm *kvm, int level) { - kvm_ioapic_set_irq(kvm->arch.vioapic, e->irqchip.pin, level); + return kvm_ioapic_set_irq(kvm->arch.vioapic, e->irqchip.pin, level); } -static void kvm_set_msi(struct kvm_kernel_irq_routing_entry *e, - struct kvm *kvm, int level) +static int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e, + struct kvm *kvm, int level) { int vcpu_id; struct kvm_vcpu *vcpu; @@ -88,13 +90,20 @@ static void kvm_set_msi(struct kvm_kernel_irq_routing_entry *e, default: break; } + return 1; } -/* This should be called with the kvm->lock mutex held */ -void kvm_set_irq(struct kvm *kvm, int irq_source_id, int irq, int level) +/* This should be called with the kvm->lock mutex held + * Return value: + * < 0 Interrupt was ignored (masked or not delivered for other reasons) + * = 0 Interrupt was coalesced (previous irq is still pending) + * > 0 Number of CPUs interrupt was delivered to + */ +int kvm_set_irq(struct kvm *kvm, int irq_source_id, int irq, int level) { struct kvm_kernel_irq_routing_entry *e; unsigned long *irq_state, sig_level; + int ret = -1; if (irq < KVM_IOAPIC_NUM_PINS) { irq_state = (unsigned long *)&kvm->arch.irq_states[irq]; @@ -113,8 +122,14 @@ void kvm_set_irq(struct kvm *kvm, int irq_source_id, int irq, int level) * writes to the unused one. */ list_for_each_entry(e, &kvm->irq_routing, link) - if (e->gsi == irq) - e->set(e, kvm, sig_level); + if (e->gsi == irq) { + int r = e->set(e, kvm, sig_level); + if (r < 0) + continue; + + ret = r + ((ret < 0) ? 0 : ret); + } + return ret; } void kvm_notify_acked_irq(struct kvm *kvm, unsigned irqchip, unsigned pin) @@ -232,7 +247,7 @@ int setup_routing_entry(struct kvm_kernel_irq_routing_entry *e, e->set = kvm_set_pic_irq; break; case KVM_IRQCHIP_PIC_SLAVE: - e->set = kvm_set_pic_irq; + e->set = kvm_set_pic_irq; delta = 8; break; case KVM_IRQCHIP_IOAPIC: |