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| author | Avi Kivity <avi@redhat.com> | 2009-01-04 17:10:50 +0200 |
|---|---|---|
| committer | Avi Kivity <avi@redhat.com> | 2009-03-24 11:03:03 +0200 |
| commit | 75858a84a6207f5e60196f6bbd18fde4250e5759 (patch) | |
| tree | ad8ab5d60a616270c61d88a9af08713cefbc9d35 /virt/kvm/ioapic.c | |
| parent | 5d9b8e30f543a9f21a968a4cda71e8f6d1c66a61 (diff) | |
| download | lwn-75858a84a6207f5e60196f6bbd18fde4250e5759.tar.gz lwn-75858a84a6207f5e60196f6bbd18fde4250e5759.zip | |
KVM: Interrupt mask notifiers for ioapic
Allow clients to request notifications when the guest masks or unmasks a
particular irq line. This complements irq ack notifications, as the guest
will not ack an irq line that is masked.
Currently implemented for the ioapic only.
Signed-off-by: Avi Kivity <avi@redhat.com>
Diffstat (limited to 'virt/kvm/ioapic.c')
| -rw-r--r-- | virt/kvm/ioapic.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/virt/kvm/ioapic.c b/virt/kvm/ioapic.c index 23b81cf242af..e85a2bcd2db1 100644 --- a/virt/kvm/ioapic.c +++ b/virt/kvm/ioapic.c @@ -101,6 +101,7 @@ static void ioapic_service(struct kvm_ioapic *ioapic, unsigned int idx) static void ioapic_write_indirect(struct kvm_ioapic *ioapic, u32 val) { unsigned index; + bool mask_before, mask_after; switch (ioapic->ioregsel) { case IOAPIC_REG_VERSION: @@ -120,6 +121,7 @@ static void ioapic_write_indirect(struct kvm_ioapic *ioapic, u32 val) ioapic_debug("change redir index %x val %x\n", index, val); if (index >= IOAPIC_NUM_PINS) return; + mask_before = ioapic->redirtbl[index].fields.mask; if (ioapic->ioregsel & 1) { ioapic->redirtbl[index].bits &= 0xffffffff; ioapic->redirtbl[index].bits |= (u64) val << 32; @@ -128,6 +130,9 @@ static void ioapic_write_indirect(struct kvm_ioapic *ioapic, u32 val) ioapic->redirtbl[index].bits |= (u32) val; ioapic->redirtbl[index].fields.remote_irr = 0; } + mask_after = ioapic->redirtbl[index].fields.mask; + if (mask_before != mask_after) + kvm_fire_mask_notifiers(ioapic->kvm, index, mask_after); if (ioapic->irr & (1 << index)) ioapic_service(ioapic, index); break; @@ -426,3 +431,4 @@ int kvm_ioapic_init(struct kvm *kvm) kvm_io_bus_register_dev(&kvm->mmio_bus, &ioapic->dev); return 0; } + |