Signed-off-by: Andre Przywara <andre.przywara@xxxxxxx>
---
virt/kvm/arm/vgic/vgic_mmio.c | 62 ++++++++++++++++++++++++++++++++++++++++++-
1 file changed, 61 insertions(+), 1 deletion(-)
diff --git a/virt/kvm/arm/vgic/vgic_mmio.c b/virt/kvm/arm/vgic/vgic_mmio.c
index 3c3dbce..a8a96c8 100644
--- a/virt/kvm/arm/vgic/vgic_mmio.c
+++ b/virt/kvm/arm/vgic/vgic_mmio.c
@@ -477,6 +477,66 @@ static int vgic_mmio_write_priority(struct kvm_vcpu *vcpu,
return 0;
}
+static int vgic_mmio_read_config(struct kvm_vcpu *vcpu,
+ struct kvm_io_device *dev,
+ gpa_t addr, int len, void *val)
+{
+ struct vgic_io_device *iodev = container_of(dev,
+ struct vgic_io_device, dev);
+ u32 intid = (addr & 0xff) * 4;
+ u32 value = 0;
+ int i;
+
+ if (iodev->redist_vcpu)
+ vcpu = iodev->redist_vcpu;
+
+ 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));
+ }
+
+ write_mask32(value, addr & 3, len, val);
+ return 0;
+}
+
+static int vgic_mmio_write_config(struct kvm_vcpu *vcpu,
+ struct kvm_io_device *dev,
+ gpa_t addr, int len, const void *val)
+{
+ struct vgic_io_device *iodev = container_of(dev,
+ struct vgic_io_device, dev);
+ u32 intid = (addr & 0xff) * 4;
+ int i;
+
+ if (iodev->redist_vcpu)
+ vcpu = iodev->redist_vcpu;
+
+ for (i = 0; i < len * 4; i++) {
+ struct vgic_irq *irq = vgic_get_irq(vcpu->kvm, vcpu, intid + i);
+
+ if (intid + i < 16)
+ continue;
+
+ /*
+ * The spec says that interrupts must be disabled before
+ * changing the configuration to avoid UNDEFINED behaviour.
+ */
+
+ 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);
+ }
+
+ return 0;
+}
+
struct vgic_register_region vgic_v2_dist_registers[] = {
REGISTER_DESC_WITH_LENGTH(GIC_DIST_CTRL,
vgic_mmio_read_v2_misc, vgic_mmio_write_v2_misc, 12),
@@ -499,7 +559,7 @@ struct vgic_register_region vgic_v2_dist_registers[] = {
REGISTER_DESC_WITH_BITS_PER_IRQ(GIC_DIST_TARGET,
vgic_mmio_read_nyi, vgic_mmio_write_nyi, 8),
REGISTER_DESC_WITH_BITS_PER_IRQ(GIC_DIST_CONFIG,
- vgic_mmio_read_nyi, vgic_mmio_write_nyi, 8),
+ vgic_mmio_read_config, vgic_mmio_write_config, 2),
REGISTER_DESC_WITH_LENGTH(GIC_DIST_SOFTINT,
vgic_mmio_read_nyi, vgic_mmio_write_nyi, 4),
REGISTER_DESC_WITH_LENGTH(GIC_DIST_SGI_PENDING_CLEAR,
--
2.7.3
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