vgic_put_irq(vcpu->kvm, irq);
}
+bool vgic_lpis_enabled(struct kvm_vcpu *vcpu)
+{
+ struct vgic_cpu *vgic_cpu = &vcpu->arch.vgic_cpu;
+
+ return atomic_read(&vgic_cpu->ctlr) == GICR_CTLR_ENABLE_LPIS;
+}
+
static unsigned long vgic_mmio_read_v3r_ctlr(struct kvm_vcpu *vcpu,
gpa_t addr, unsigned int len)
{
return vgic_cpu->lpis_enabled ? GICR_CTLR_ENABLE_LPIS : 0;
}
-
static void vgic_mmio_write_v3r_ctlr(struct kvm_vcpu *vcpu,
gpa_t addr, unsigned int len,
unsigned long val)
{
struct vgic_cpu *vgic_cpu = &vcpu->arch.vgic_cpu;
- bool was_enabled = vgic_cpu->lpis_enabled;
+ u32 ctlr;
if (!vgic_has_its(vcpu->kvm))
return;
- vgic_cpu->lpis_enabled = val & GICR_CTLR_ENABLE_LPIS;
+ if (!(val & GICR_CTLR_ENABLE_LPIS)) {
+ /*
+ * Don't disable if RWP is set, as there already an
+ * ongoing disable. Funky guest...
+ */
+ ctlr = atomic_cmpxchg_acquire(&vgic_cpu->ctlr,
+ GICR_CTLR_ENABLE_LPIS,
+ GICR_CTLR_RWP);
+ if (ctlr != GICR_CTLR_ENABLE_LPIS)
+ return;
- if (was_enabled && !vgic_cpu->lpis_enabled) {
vgic_flush_pending_lpis(vcpu);
vgic_its_invalidate_cache(vcpu->kvm);
- }
+ atomic_set_release(&vgic_cpu->ctlr, 0);
+ } else {
+ ctlr = atomic_cmpxchg_acquire(&vgic_cpu->ctlr, 0,
+ GICR_CTLR_ENABLE_LPIS);
+ if (ctlr != 0)
+ return;
- if (!was_enabled && vgic_cpu->lpis_enabled)
vgic_enable_lpis(vcpu);
+ }
}
static bool vgic_mmio_vcpu_rdist_is_last(struct kvm_vcpu *vcpu)
unsigned long val)
{
struct vgic_dist *dist = &vcpu->kvm->arch.vgic;
- struct vgic_cpu *vgic_cpu = &vcpu->arch.vgic_cpu;
u64 old_propbaser, propbaser;
/* Storing a value with LPIs already enabled is undefined */
- if (vgic_cpu->lpis_enabled)
+ if (vgic_lpis_enabled(vcpu))
return;
do {
u64 old_pendbaser, pendbaser;
/* Storing a value with LPIs already enabled is undefined */
- if (vgic_cpu->lpis_enabled)
+ if (vgic_lpis_enabled(vcpu))
return;
do {
(base < d->vgic_dist_base + KVM_VGIC_V3_DIST_SIZE);
}
+bool vgic_lpis_enabled(struct kvm_vcpu *vcpu);
int vgic_copy_lpi_list(struct kvm *kvm, struct kvm_vcpu *vcpu, u32 **intid_ptr);
int vgic_its_resolve_lpi(struct kvm *kvm, struct vgic_its *its,
u32 devid, u32 eventid, struct vgic_irq **irq);