As this register is v2 specific, its implementation lives entirely
in vgic-mmio-v2.c.
This register allows setting the source mask of an IPI.
Signed-off-by: Andre Przywara <andre.przywara@xxxxxxx>
Reviewed-by: Christoffer Dall <christoffer.dall@xxxxxxxxxx>
---
Changelog RFC..v1:
- remove IRQ lock from read handler
- update pending bit on setting the first / clearing the last bit
- queue virtual IRQ if necessary
Changelog v1 .. v2:
- adapt to new MMIO framework
Changelog v3 .. v4:
- specify accessor width
virt/kvm/arm/vgic/vgic-mmio-v2.c | 62 ++++++++++++++++++++++++++++++++++++++--
1 file changed, 60 insertions(+), 2 deletions(-)
diff --git a/virt/kvm/arm/vgic/vgic-mmio-v2.c b/virt/kvm/arm/vgic/vgic-mmio-v2.c
index c884e9b..3925d4c 100644
--- a/virt/kvm/arm/vgic/vgic-mmio-v2.c
+++ b/virt/kvm/arm/vgic/vgic-mmio-v2.c
@@ -146,6 +146,64 @@ static void vgic_mmio_write_target(struct kvm_vcpu *vcpu,
}
}
+static unsigned long vgic_mmio_read_sgipend(struct kvm_vcpu *vcpu,
+ gpa_t addr, unsigned int len)
+{
+ u32 intid = addr & 0x0f;
+ int i;
+ u64 val = 0;
+
+ for (i = 0; i < len; i++) {
+ struct vgic_irq *irq = vgic_get_irq(vcpu->kvm, vcpu, intid + i);
+
+ val |= (u64)irq->source << (i * 8);
+ }
+ return val;
+}
+
+static void vgic_mmio_write_sgipendc(struct kvm_vcpu *vcpu,
+ gpa_t addr, unsigned int len,
+ unsigned long val)
+{
+ u32 intid = addr & 0x0f;
+ int i;
+
+ for (i = 0; i < len; i++) {
+ struct vgic_irq *irq = vgic_get_irq(vcpu->kvm, vcpu, intid + i);
+
+ spin_lock(&irq->irq_lock);
+
+ irq->source &= ~((val >> (i * 8)) & 0xff);
+ if (!irq->source)
+ irq->pending = false;
+
+ spin_unlock(&irq->irq_lock);
+ }
+}
+
+static void vgic_mmio_write_sgipends(struct kvm_vcpu *vcpu,
+ gpa_t addr, unsigned int len,
+ unsigned long val)
+{
+ u32 intid = addr & 0x0f;
+ int i;
+
+ for (i = 0; i < len; i++) {
+ struct vgic_irq *irq = vgic_get_irq(vcpu->kvm, vcpu, intid + i);
+
+ spin_lock(&irq->irq_lock);
+
+ irq->source |= (val >> (i * 8)) & 0xff;
+
+ if (irq->source) {
+ irq->pending = true;
+ vgic_queue_irq_unlock(vcpu->kvm, irq);
+ } else {
+ spin_unlock(&irq->irq_lock);
+ }
+ }
+}
+
static const 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,
@@ -184,10 +242,10 @@ static const struct vgic_register_region vgic_v2_dist_registers[] = {
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,
+ vgic_mmio_read_sgipend, vgic_mmio_write_sgipendc, 16,
VGIC_ACCESS_32bit | VGIC_ACCESS_8bit),
REGISTER_DESC_WITH_LENGTH(GIC_DIST_SGI_PENDING_SET,
- vgic_mmio_read_raz, vgic_mmio_write_wi, 16,
+ vgic_mmio_read_sgipend, vgic_mmio_write_sgipends, 16,
VGIC_ACCESS_32bit | VGIC_ACCESS_8bit),
};
--
2.8.2
--
To unsubscribe from this list: send the line "unsubscribe kvm" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
