KVM: arm/arm64: vgic-new: Add SGIR register handler

Triggering an IPI via this register is v2 specific, so the
implementation lives entirely in vgic-mmio-v2.c.

Signed-off-by: Andre Przywara <andre.przywara@arm.com>
Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>

diff --git a/virt/kvm/arm/vgic/vgic-mmio-v2.c b/virt/kvm/arm/vgic/vgic-mmio-v2.c
index 52389ff..c884e9b 100644 (file)
--- a/virt/kvm/arm/vgic/vgic-mmio-v2.c
+++ b/virt/kvm/arm/vgic/vgic-mmio-v2.c
@@ -64,6 +64,47 @@ static void vgic_mmio_write_v2_misc(struct kvm_vcpu *vcpu,
        }
 }
 
+static void vgic_mmio_write_sgir(struct kvm_vcpu *source_vcpu,
+                                gpa_t addr, unsigned int len,
+                                unsigned long val)
+{
+       int nr_vcpus = atomic_read(&source_vcpu->kvm->online_vcpus);
+       int intid = val & 0xf;
+       int targets = (val >> 16) & 0xff;
+       int mode = (val >> 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 */
+               return;
+       }
+
+       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_unlock(source_vcpu->kvm, irq);
+       }
+}
+
 static unsigned long vgic_mmio_read_target(struct kvm_vcpu *vcpu,
                                           gpa_t addr, unsigned int len)
 {
@@ -140,7 +181,7 @@ static const struct vgic_register_region vgic_v2_dist_registers[] = {
                vgic_mmio_read_config, vgic_mmio_write_config, 2,
                VGIC_ACCESS_32bit),
        REGISTER_DESC_WITH_LENGTH(GIC_DIST_SOFTINT,
-               vgic_mmio_read_raz, vgic_mmio_write_wi, 4,
+               vgic_mmio_read_raz, vgic_mmio_write_sgir, 4,
                VGIC_ACCESS_32bit),
        REGISTER_DESC_WITH_LENGTH(GIC_DIST_SGI_PENDING_CLEAR,
                vgic_mmio_read_raz, vgic_mmio_write_wi, 16,