diff options
Diffstat (limited to 'virt/kvm/arm/vgic/vgic-mmio.c')
-rw-r--r-- | virt/kvm/arm/vgic/vgic-mmio.c | 47 |
1 files changed, 47 insertions, 0 deletions
diff --git a/virt/kvm/arm/vgic/vgic-mmio.c b/virt/kvm/arm/vgic/vgic-mmio.c index 6f4e05b..9de80be 100644 --- a/virt/kvm/arm/vgic/vgic-mmio.c +++ b/virt/kvm/arm/vgic/vgic-mmio.c @@ -276,6 +276,53 @@ void vgic_mmio_write_priority(struct kvm_vcpu *vcpu, } } +unsigned long vgic_mmio_read_config(struct kvm_vcpu *vcpu, + gpa_t addr, unsigned int len) +{ + u32 intid = VGIC_ADDR_TO_INTID(addr, 2); + u32 value = 0; + int i; + + for (i = 0; i < len * 4; i++) { + struct vgic_irq *irq = vgic_get_irq(vcpu->kvm, vcpu, intid + i); + + if (irq->config == VGIC_CONFIG_EDGE) + value |= (2U << (i * 2)); + } + + return value; +} + +void vgic_mmio_write_config(struct kvm_vcpu *vcpu, + gpa_t addr, unsigned int len, + unsigned long val) +{ + u32 intid = VGIC_ADDR_TO_INTID(addr, 2); + int i; + + for (i = 0; i < len * 4; i++) { + struct vgic_irq *irq = vgic_get_irq(vcpu->kvm, vcpu, intid + i); + + /* + * The configuration cannot be changed for SGIs in general, + * for PPIs this is IMPLEMENTATION DEFINED. The arch timer + * code relies on PPIs being level triggered, so we also + * make them read-only here. + */ + if (intid + i < VGIC_NR_PRIVATE_IRQS) + continue; + + spin_lock(&irq->irq_lock); + if (test_bit(i * 2 + 1, &val)) { + irq->config = VGIC_CONFIG_EDGE; + } else { + irq->config = VGIC_CONFIG_LEVEL; + irq->pending = irq->line_level | irq->soft_pending; + } + spin_unlock(&irq->irq_lock); + } +} + static int match_region(const void *key, const void *elt) { const unsigned int offset = (unsigned long)key; |