[RFC PATCH 21/45] KVM: arm/arm64: vgic-new: Add SGIR register handler

Andre Przywara
2016-03-25T02:04:57Z

Signed-off-by: Andre Przywara <andre.przywara@arm.com>
---
virt/kvm/arm/vgic/vgic_mmio.c | 46 ++++++++++++++++++++++++++++++++++++++++++-
1 file changed, 45 insertions(+), 1 deletion(-)

diff --git a/virt/kvm/arm/vgic/vgic_mmio.c b/virt/kvm/arm/vgic/vgic_mmio.c
index cde153f..a49726f 100644
--- a/virt/kvm/arm/vgic/vgic_mmio.c
+++ b/virt/kvm/arm/vgic/vgic_mmio.c
@@ -512,6 +512,50 @@ static int vgic_mmio_write_target(struct kvm_vcpu *vcpu,
return 0;
}

+static int vgic_mmio_write_sgir(struct kvm_vcpu *source_vcpu,
+ struct kvm_io_device *this,
+ gpa_t addr, int len, const void *val)
+{
+ int nr_vcpus = atomic_read(&source_vcpu->kvm->online_vcpus);
+ u32 value = *(u32 *)val;
+ int intid = value & 0xf;
+ int targets = (value >> 16) & 0xff;
+ int mode = (value >> 24) & 0x03;
+ int c;
+ struct kvm_vcpu *vcpu;
+
+ switch (mode) {
+ case 0x0: /* as specified by targets */
+ break;
+ case 0x1:
+ targets = (1U << nr_vcpus) - 1; /* all, ... */
+ targets &= ~(1U << source_vcpu->vcpu_id); /* but self */
+ break;
+ case 0x2: /* this very vCPU only */
+ targets = (1U << source_vcpu->vcpu_id);
+ break;
+ case 0x3: /* reserved */
+ break;
+ }
+
+ kvm_for_each_vcpu(c, vcpu, source_vcpu->kvm) {
+ struct vgic_irq *irq;
+
+ if (!(targets & (1U << c)))
+ continue;
+
+ irq = vgic_get_irq(source_vcpu->kvm, vcpu, intid);
+
+ spin_lock(&irq->irq_lock);
+ irq->pending = true;
+ irq->source |= 1U << source_vcpu->vcpu_id;
+
+ vgic_queue_irq(source_vcpu->kvm, irq);
+ }
+
+ 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),
@@ -536,7 +580,7 @@ struct vgic_register_region vgic_v2_dist_registers[] = {
REGISTER_DESC_WITH_BITS_PER_IRQ(GIC_DIST_CONFIG,
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),
+ vgic_mmio_read_raz, vgic_mmio_write_sgir, 4),
REGISTER_DESC_WITH_LENGTH(GIC_DIST_SGI_PENDING_CLEAR,
vgic_mmio_read_nyi, vgic_mmio_write_nyi, 16),
REGISTER_DESC_WITH_LENGTH(GIC_DIST_SGI_PENDING_SET,
--
2.7.3