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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/ioapic.c | |
| parent | 110c2faeba1f1994bcb1de55b9c31f4147dbfdb6 (diff) | |
| download | linux-bfd349d073b2838a6a031f057d25e266619b7093.tar.gz linux-bfd349d073b2838a6a031f057d25e266619b7093.tar.bz2 linux-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/ioapic.c')
| -rw-r--r-- | virt/kvm/ioapic.c | 24 |
1 files changed, 13 insertions, 11 deletions
diff --git a/virt/kvm/ioapic.c b/virt/kvm/ioapic.c index 3b5371299dd1..7c2cb2bd1199 100644 --- a/virt/kvm/ioapic.c +++ b/virt/kvm/ioapic.c @@ -203,7 +203,7 @@ void kvm_ioapic_get_delivery_bitmask(struct kvm_ioapic *ioapic, u8 dest, static int ioapic_deliver(struct kvm_ioapic *ioapic, int irq) { union kvm_ioapic_redirect_entry entry = ioapic->redirtbl[irq]; - unsigned long deliver_bitmask; + DECLARE_BITMAP(deliver_bitmask, KVM_MAX_VCPUS); struct kvm_vcpu *vcpu; int vcpu_id, r = -1; @@ -213,22 +213,24 @@ static int ioapic_deliver(struct kvm_ioapic *ioapic, int irq) entry.fields.delivery_mode, entry.fields.vector, entry.fields.trig_mode); - kvm_get_intr_delivery_bitmask(ioapic, &entry, &deliver_bitmask); - if (!deliver_bitmask) { - ioapic_debug("no target on destination\n"); - return 0; - } + bitmap_zero(deliver_bitmask, KVM_MAX_VCPUS); /* Always delivery PIT interrupt to vcpu 0 */ #ifdef CONFIG_X86 if (irq == 0) - deliver_bitmask = 1; + __set_bit(0, deliver_bitmask); + else #endif + kvm_get_intr_delivery_bitmask(ioapic, &entry, deliver_bitmask); + + if (find_first_bit(deliver_bitmask, KVM_MAX_VCPUS) >= KVM_MAX_VCPUS) { + ioapic_debug("no target on destination\n"); + return 0; + } - 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 (entry.fields.delivery_mode == |