diff options
author | Feng Wu <feng.wu@intel.com> | 2015-09-18 16:29:47 +0200 |
---|---|---|
committer | Paolo Bonzini <pbonzini@redhat.com> | 2015-10-01 15:06:49 +0200 |
commit | 8feb4a04dc756002f78df0026e58118669de4851 (patch) | |
tree | 5805a8d7b71c693d71dacf1d417d1f600732cef9 /arch/x86/kvm/irq_comm.c | |
parent | KVM: Add some helper functions for Posted-Interrupts (diff) | |
download | linux-8feb4a04dc756002f78df0026e58118669de4851.tar.xz linux-8feb4a04dc756002f78df0026e58118669de4851.zip |
KVM: Define a new interface kvm_intr_is_single_vcpu()
This patch defines a new interface kvm_intr_is_single_vcpu(),
which can returns whether the interrupt is for single-CPU or not.
It is used by VT-d PI, since now we only support single-CPU
interrupts, For lowest-priority interrupts, if user configures
it via /proc/irq or uses irqbalance to make it single-CPU, we
can use PI to deliver the interrupts to it. Full functionality
of lowest-priority support will be added later.
Signed-off-by: Feng Wu <feng.wu@intel.com>
Reviewed-by: Alex Williamson <alex.williamson@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/x86/kvm/irq_comm.c')
-rw-r--r-- | arch/x86/kvm/irq_comm.c | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/arch/x86/kvm/irq_comm.c b/arch/x86/kvm/irq_comm.c index 177460998bb0..39f833f8132e 100644 --- a/arch/x86/kvm/irq_comm.c +++ b/arch/x86/kvm/irq_comm.c @@ -297,6 +297,33 @@ out: return r; } +bool kvm_intr_is_single_vcpu(struct kvm *kvm, struct kvm_lapic_irq *irq, + struct kvm_vcpu **dest_vcpu) +{ + int i, r = 0; + struct kvm_vcpu *vcpu; + + if (kvm_intr_is_single_vcpu_fast(kvm, irq, dest_vcpu)) + return true; + + kvm_for_each_vcpu(i, vcpu, kvm) { + if (!kvm_apic_present(vcpu)) + continue; + + if (!kvm_apic_match_dest(vcpu, NULL, irq->shorthand, + irq->dest_id, irq->dest_mode)) + continue; + + if (++r == 2) + return false; + + *dest_vcpu = vcpu; + } + + return r == 1; +} +EXPORT_SYMBOL_GPL(kvm_intr_is_single_vcpu); + #define IOAPIC_ROUTING_ENTRY(irq) \ { .gsi = irq, .type = KVM_IRQ_ROUTING_IRQCHIP, \ .u.irqchip = { .irqchip = KVM_IRQCHIP_IOAPIC, .pin = (irq) } } |