Signed-off-by: Andre Przywara <andre.przywara@xxxxxxx>
Changelog RFC..v1:
- kick VCPUs is the distributor gets enabled
- improve comment
---
virt/kvm/arm/vgic/vgic.h | 3 +++
virt/kvm/arm/vgic/vgic_mmio.c | 50 ++++++++++++++++++++++++++++++++++++++++++-
2 files changed, 52 insertions(+), 1 deletion(-)
diff --git a/virt/kvm/arm/vgic/vgic.h b/virt/kvm/arm/vgic/vgic.h
index 8f5d50a..59fddbf 100644
--- a/virt/kvm/arm/vgic/vgic.h
+++ b/virt/kvm/arm/vgic/vgic.h
@@ -16,6 +16,9 @@
#ifndef __KVM_ARM_VGIC_NEW_H__
#define __KVM_ARM_VGIC_NEW_H__
+#define PRODUCT_ID_KVM 0x4b /* ASCII code K */
+#define IMPLEMENTER_ARM 0x43b
+
#define vgic_irq_is_sgi(intid) ((intid) < VGIC_NR_SGIS)
struct vgic_irq *vgic_get_irq(struct kvm *kvm, struct kvm_vcpu *vcpu,
diff --git a/virt/kvm/arm/vgic/vgic_mmio.c b/virt/kvm/arm/vgic/vgic_mmio.c
index 21c78a7..8ef1902 100644
--- a/virt/kvm/arm/vgic/vgic_mmio.c
+++ b/virt/kvm/arm/vgic/vgic_mmio.c
@@ -90,9 +90,57 @@ static int vgic_mmio_write_nyi(struct kvm_vcpu *vcpu,
return 0;
}
+static int vgic_mmio_read_v2_misc(struct kvm_vcpu *vcpu,
+ struct kvm_io_device *dev,
+ gpa_t addr, int len, void *val)
+{
+ u32 value;
+
+ switch (addr & 0x0c) {
+ case 0x0:
+ value = vcpu->kvm->arch.vgic.enabled ? GICD_ENABLE : 0;
+ break;
+ case 0x4:
+ value = vcpu->kvm->arch.vgic.nr_spis + VGIC_NR_PRIVATE_IRQS;
+ value = (value >> 5) - 1;
+ value |= (atomic_read(&vcpu->kvm->online_vcpus) - 1) << 5;
+ break;
+ case 0x8:
+ value = (PRODUCT_ID_KVM << 24) | (IMPLEMENTER_ARM << 0);
+ break;
+ default:
+ return 0;
+ }
+
+ write_mask32(value, addr & 3, len, val);
+ return 0;
+}
+
+static int vgic_mmio_write_v2_misc(struct kvm_vcpu *vcpu,
+ struct kvm_io_device *dev,
+ gpa_t addr, int len, const void *val)
+{
+ struct vgic_dist *dist = &vcpu->kvm->arch.vgic;
+ bool was_enabled = dist->enabled;
+
+ /*
+ * GICD_TYPER and GICD_IIDR are read-only, the upper three bytes of
+ * GICD_CTLR are reserved.
+ */
+ if ((addr & 0x0f) >= 1)
+ return 0;
+
+ vcpu->kvm->arch.vgic.enabled = (*(u32 *)val) ? true : false;
+
+ if (!was_enabled && dist->enabled)
+ vgic_kick_vcpus(vcpu->kvm);
+
+ return 0;
+}
+
struct vgic_register_region vgic_v2_dist_registers[] = {
REGISTER_DESC_WITH_LENGTH(GIC_DIST_CTRL,
- vgic_mmio_read_nyi, vgic_mmio_write_nyi, 12),
+ vgic_mmio_read_v2_misc, vgic_mmio_write_v2_misc, 12),
REGISTER_DESC_WITH_BITS_PER_IRQ(GIC_DIST_IGROUP,
vgic_mmio_read_rao, vgic_mmio_write_wi, 1),
REGISTER_DESC_WITH_BITS_PER_IRQ(GIC_DIST_ENABLE_SET,
--
2.7.3
--
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