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| author | Sheng Yang <sheng@linux.intel.com> | 2009-02-11 16:03:40 +0800 |
|---|---|---|
| committer | Avi Kivity <avi@redhat.com> | 2009-06-10 11:48:22 +0300 |
| commit | bfd349d073b2838a6a031f057d25e266619b7093 (patch) | |
| tree | b2b2f2f3f99a7e860fb7bb7c54ce322700055ebd /virt/kvm/irq_comm.c | |
| parent | 110c2faeba1f1994bcb1de55b9c31f4147dbfdb6 (diff) | |
| download | lwn-bfd349d073b2838a6a031f057d25e266619b7093.tar.gz lwn-bfd349d073b2838a6a031f057d25e266619b7093.zip | |
KVM: bit ops for deliver_bitmap
It's also convenient when we extend KVM supported vcpu number in the future.
Signed-off-by: Sheng Yang <sheng@linux.intel.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 | 17 |
1 files changed, 9 insertions, 8 deletions
diff --git a/virt/kvm/irq_comm.c b/virt/kvm/irq_comm.c index d4421cd6d663..d165e056f79b 100644 --- a/virt/kvm/irq_comm.c +++ b/virt/kvm/irq_comm.c @@ -56,7 +56,7 @@ void kvm_get_intr_delivery_bitmask(struct kvm_ioapic *ioapic, case IOAPIC_LOWEST_PRIORITY: vcpu = kvm_get_lowest_prio_vcpu(ioapic->kvm, entry->fields.vector, deliver_bitmask); - *deliver_bitmask = 1 << vcpu->vcpu_id; + __set_bit(vcpu->vcpu_id, deliver_bitmask); break; case IOAPIC_FIXED: case IOAPIC_NMI: @@ -76,10 +76,12 @@ static int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e, struct kvm_vcpu *vcpu; struct kvm_ioapic *ioapic = ioapic_irqchip(kvm); union kvm_ioapic_redirect_entry entry; - unsigned long deliver_bitmask; + DECLARE_BITMAP(deliver_bitmask, KVM_MAX_VCPUS); BUG_ON(!ioapic); + bitmap_zero(deliver_bitmask, KVM_MAX_VCPUS); + entry.bits = 0; entry.fields.dest_id = (e->msi.address_lo & MSI_ADDR_DEST_ID_MASK) >> MSI_ADDR_DEST_ID_SHIFT; @@ -95,16 +97,15 @@ static int kvm_set_msi(struct kvm_kernel_irq_routing_entry *e, /* TODO Deal with RH bit of MSI message address */ - kvm_get_intr_delivery_bitmask(ioapic, &entry, &deliver_bitmask); + kvm_get_intr_delivery_bitmask(ioapic, &entry, deliver_bitmask); - if (!deliver_bitmask) { + if (find_first_bit(deliver_bitmask, KVM_MAX_VCPUS) >= KVM_MAX_VCPUS) { printk(KERN_WARNING "kvm: no destination for MSI delivery!"); return -1; } - for (vcpu_id = 0; deliver_bitmask != 0; vcpu_id++) { - if (!(deliver_bitmask & (1 << vcpu_id))) - continue; - deliver_bitmask &= ~(1 << vcpu_id); + while ((vcpu_id = find_first_bit(deliver_bitmask, + KVM_MAX_VCPUS)) < KVM_MAX_VCPUS) { + __clear_bit(vcpu_id, deliver_bitmask); vcpu = ioapic->kvm->vcpus[vcpu_id]; if (vcpu) { if (r < 0) |