diff options
Diffstat (limited to 'virt/kvm/arm/vgic/vgic.c')
-rw-r--r-- | virt/kvm/arm/vgic/vgic.c | 68 |
1 files changed, 57 insertions, 11 deletions
diff --git a/virt/kvm/arm/vgic/vgic.c b/virt/kvm/arm/vgic/vgic.c index 83b24d2..fed717e 100644 --- a/virt/kvm/arm/vgic/vgic.c +++ b/virt/kvm/arm/vgic/vgic.c @@ -35,11 +35,12 @@ struct vgic_global kvm_vgic_global_state __ro_after_init = { /* * Locking order is always: - * its->cmd_lock (mutex) - * its->its_lock (mutex) - * vgic_cpu->ap_list_lock - * kvm->lpi_list_lock - * vgic_irq->irq_lock + * kvm->lock (mutex) + * its->cmd_lock (mutex) + * its->its_lock (mutex) + * vgic_cpu->ap_list_lock + * kvm->lpi_list_lock + * vgic_irq->irq_lock * * If you need to take multiple locks, always take the upper lock first, * then the lower ones, e.g. first take the its_lock, then the irq_lock. @@ -234,10 +235,14 @@ static void vgic_sort_ap_list(struct kvm_vcpu *vcpu) /* * Only valid injection if changing level for level-triggered IRQs or for a - * rising edge. + * rising edge, and in-kernel connected IRQ lines can only be controlled by + * their owner. */ -static bool vgic_validate_injection(struct vgic_irq *irq, bool level) +static bool vgic_validate_injection(struct vgic_irq *irq, bool level, void *owner) { + if (irq->owner != owner) + return false; + switch (irq->config) { case VGIC_CONFIG_LEVEL: return irq->line_level != level; @@ -285,8 +290,10 @@ retry: * won't see this one until it exits for some other * reason. */ - if (vcpu) + if (vcpu) { + kvm_make_request(KVM_REQ_IRQ_PENDING, vcpu); kvm_vcpu_kick(vcpu); + } return false; } @@ -332,6 +339,7 @@ retry: spin_unlock(&irq->irq_lock); spin_unlock(&vcpu->arch.vgic_cpu.ap_list_lock); + kvm_make_request(KVM_REQ_IRQ_PENDING, vcpu); kvm_vcpu_kick(vcpu); return true; @@ -346,13 +354,16 @@ retry: * false: to ignore the call * Level-sensitive true: raise the input signal * false: lower the input signal + * @owner: The opaque pointer to the owner of the IRQ being raised to verify + * that the caller is allowed to inject this IRQ. Userspace + * injections will have owner == NULL. * * The VGIC is not concerned with devices being active-LOW or active-HIGH for * level-sensitive interrupts. You can think of the level parameter as 1 * being HIGH and 0 being LOW and all devices being active-HIGH. */ int kvm_vgic_inject_irq(struct kvm *kvm, int cpuid, unsigned int intid, - bool level) + bool level, void *owner) { struct kvm_vcpu *vcpu; struct vgic_irq *irq; @@ -374,7 +385,7 @@ int kvm_vgic_inject_irq(struct kvm *kvm, int cpuid, unsigned int intid, spin_lock(&irq->irq_lock); - if (!vgic_validate_injection(irq, level)) { + if (!vgic_validate_injection(irq, level, owner)) { /* Nothing to see here, move along... */ spin_unlock(&irq->irq_lock); vgic_put_irq(kvm, irq); @@ -431,6 +442,39 @@ 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 @@ -721,8 +765,10 @@ void vgic_kick_vcpus(struct kvm *kvm) * a good kick... */ kvm_for_each_vcpu(c, vcpu, kvm) { - if (kvm_vgic_vcpu_pending_irq(vcpu)) + if (kvm_vgic_vcpu_pending_irq(vcpu)) { + kvm_make_request(KVM_REQ_IRQ_PENDING, vcpu); kvm_vcpu_kick(vcpu); + } } } |