diff options
| author | Christoffer Dall <cdall@linaro.org> | 2017-05-04 14:24:20 +0300 |
|---|---|---|
| committer | Christoffer Dall <cdall@linaro.org> | 2017-06-08 17:59:57 +0300 |
| commit | c6ccd30e0de384f506449474ca780ff680ad4217 (patch) | |
| tree | 5fa2382ca0cb42e08e0dd080f9a68769f5547a6b | |
| parent | 99a1db7a2c9b2ecb9a801cee3f6a7a71945a2fca (diff) | |
| download | linux-c6ccd30e0de384f506449474ca780ff680ad4217.tar.xz | |
KVM: arm/arm64: Introduce an allocator for in-kernel irq lines
Having multiple devices being able to signal the same interrupt line is
very confusing and almost certainly guarantees a configuration error.
Therefore, introduce a very simple allocator which allows a device to
claim an interrupt line from the vgic for a given VM.
Signed-off-by: Christoffer Dall <cdall@linaro.org>
Acked-by: Marc Zyngier <marc.zyngier@arm.com>
| -rw-r--r-- | include/kvm/arm_vgic.h | 5 | ||||
| -rw-r--r-- | virt/kvm/arm/vgic/vgic.c | 33 |
2 files changed, 38 insertions, 0 deletions
diff --git a/include/kvm/arm_vgic.h b/include/kvm/arm_vgic.h index dde59fbc5f80..5d5b34534ce9 100644 --- a/include/kvm/arm_vgic.h +++ b/include/kvm/arm_vgic.h @@ -121,6 +121,9 @@ struct vgic_irq { u8 source; /* GICv2 SGIs only */ u8 priority; enum vgic_irq_config config; /* Level or edge */ + + void *owner; /* Opaque pointer to reserve an interrupt + for in-kernel devices. */ }; struct vgic_register_region; @@ -340,4 +343,6 @@ int kvm_send_userspace_msi(struct kvm *kvm, struct kvm_msi *msi); */ int kvm_vgic_setup_default_irq_routing(struct kvm *kvm); +int kvm_vgic_set_owner(struct kvm_vcpu *vcpu, unsigned int intid, void *owner); + #endif /* __KVM_ARM_VGIC_H */ diff --git a/virt/kvm/arm/vgic/vgic.c b/virt/kvm/arm/vgic/vgic.c index c66feaca2a5d..9628945234e4 100644 --- a/virt/kvm/arm/vgic/vgic.c +++ b/virt/kvm/arm/vgic/vgic.c @@ -435,6 +435,39 @@ int kvm_vgic_unmap_phys_irq(struct kvm_vcpu *vcpu, unsigned int virt_irq) } /** + * kvm_vgic_set_owner - Set the owner of an interrupt for a VM + * + * @vcpu: Pointer to the VCPU (used for PPIs) + * @intid: The virtual INTID identifying the interrupt (PPI or SPI) + * @owner: Opaque pointer to the owner + * + * Returns 0 if intid is not already used by another in-kernel device and the + * owner is set, otherwise returns an error code. + */ +int kvm_vgic_set_owner(struct kvm_vcpu *vcpu, unsigned int intid, void *owner) +{ + struct vgic_irq *irq; + int ret = 0; + + if (!vgic_initialized(vcpu->kvm)) + return -EAGAIN; + + /* SGIs and LPIs cannot be wired up to any device */ + if (!irq_is_ppi(intid) && !vgic_valid_spi(vcpu->kvm, intid)) + return -EINVAL; + + irq = vgic_get_irq(vcpu->kvm, vcpu, intid); + spin_lock(&irq->irq_lock); + if (irq->owner && irq->owner != owner) + ret = -EEXIST; + else + irq->owner = owner; + spin_unlock(&irq->irq_lock); + + return ret; +} + +/** * vgic_prune_ap_list - Remove non-relevant interrupts from the list * * @vcpu: The VCPU pointer |