aboutsummaryrefslogtreecommitdiff
path: root/virt
diff options
context:
space:
mode:
authorChristoffer Dall <christoffer.dall@linaro.org>2013-11-15 20:51:31 -0800
committerChristoffer Dall <christoffer.dall@linaro.org>2013-12-21 10:01:44 -0800
commitcbd333a4bfd0d93bba36d46a0e4e7979228873a6 (patch)
tree700a2000d496cbca1a5d12b6ec04195be91f92fb /virt
parentc07a0191ef2de1f9510f12d1f88e3b0b5cd8d66f (diff)
downloadlinux-cbd333a4bfd0d93bba36d46a0e4e7979228873a6.tar.gz
KVM: arm-vgic: Support unqueueing of LRs to the dist
To properly access the VGIC state from user space it is very unpractical to have to loop through all the LRs in all register access functions. Instead, support moving all pending state from LRs to the distributor, but leave active state LRs alone. Note that to accurately present the active and pending state to VCPUs reading these distributor registers from a live VM, we would have to stop all other VPUs than the calling VCPU and ask each CPU to unqueue their LR state onto the distributor and add fields to track active state on the distributor side as well. We don't have any users of such functionality yet and there are other inaccuracies of the GIC emulation, so don't provide accurate synchronized access to this state just yet. However, when the time comes, having this function should help. Acked-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
Diffstat (limited to 'virt')
-rw-r--r--virt/kvm/arm/vgic.c88
1 files changed, 83 insertions, 5 deletions
diff --git a/virt/kvm/arm/vgic.c b/virt/kvm/arm/vgic.c
index 88599b58536..d08ba28e729 100644
--- a/virt/kvm/arm/vgic.c
+++ b/virt/kvm/arm/vgic.c
@@ -589,6 +589,80 @@ static bool handle_mmio_sgi_reg(struct kvm_vcpu *vcpu,
return false;
}
+#define LR_CPUID(lr) \
+ (((lr) & GICH_LR_PHYSID_CPUID) >> GICH_LR_PHYSID_CPUID_SHIFT)
+#define LR_IRQID(lr) \
+ ((lr) & GICH_LR_VIRTUALID)
+
+static void vgic_retire_lr(int lr_nr, int irq, struct vgic_cpu *vgic_cpu)
+{
+ clear_bit(lr_nr, vgic_cpu->lr_used);
+ vgic_cpu->vgic_lr[lr_nr] &= ~GICH_LR_STATE;
+ vgic_cpu->vgic_irq_lr_map[irq] = LR_EMPTY;
+}
+
+/**
+ * vgic_unqueue_irqs - move pending IRQs from LRs to the distributor
+ * @vgic_cpu: Pointer to the vgic_cpu struct holding the LRs
+ *
+ * Move any pending IRQs that have already been assigned to LRs back to the
+ * emulated distributor state so that the complete emulated state can be read
+ * from the main emulation structures without investigating the LRs.
+ *
+ * Note that IRQs in the active state in the LRs get their pending state moved
+ * to the distributor but the active state stays in the LRs, because we don't
+ * track the active state on the distributor side.
+ */
+static void vgic_unqueue_irqs(struct kvm_vcpu *vcpu)
+{
+ struct vgic_dist *dist = &vcpu->kvm->arch.vgic;
+ struct vgic_cpu *vgic_cpu = &vcpu->arch.vgic_cpu;
+ int vcpu_id = vcpu->vcpu_id;
+ int i, irq, source_cpu;
+ u32 *lr;
+
+ for_each_set_bit(i, vgic_cpu->lr_used, vgic_cpu->nr_lr) {
+ lr = &vgic_cpu->vgic_lr[i];
+ irq = LR_IRQID(*lr);
+ source_cpu = LR_CPUID(*lr);
+
+ /*
+ * There are three options for the state bits:
+ *
+ * 01: pending
+ * 10: active
+ * 11: pending and active
+ *
+ * If the LR holds only an active interrupt (not pending) then
+ * just leave it alone.
+ */
+ if ((*lr & GICH_LR_STATE) == GICH_LR_ACTIVE_BIT)
+ continue;
+
+ /*
+ * Reestablish the pending state on the distributor and the
+ * CPU interface. It may have already been pending, but that
+ * is fine, then we are only setting a few bits that were
+ * already set.
+ */
+ vgic_dist_irq_set(vcpu, irq);
+ if (irq < VGIC_NR_SGIS)
+ dist->irq_sgi_sources[vcpu_id][irq] |= 1 << source_cpu;
+ *lr &= ~GICH_LR_PENDING_BIT;
+
+ /*
+ * If there's no state left on the LR (it could still be
+ * active), then the LR does not hold any useful info and can
+ * be marked as free for other use.
+ */
+ if (!(*lr & GICH_LR_STATE))
+ vgic_retire_lr(i, irq, vgic_cpu);
+
+ /* Finally update the VGIC state. */
+ vgic_update_state(vcpu->kvm);
+ }
+}
+
static bool handle_mmio_sgi_clear(struct kvm_vcpu *vcpu,
struct kvm_exit_mmio *mmio,
phys_addr_t offset)
@@ -848,8 +922,6 @@ static void vgic_update_state(struct kvm *kvm)
}
}
-#define LR_CPUID(lr) \
- (((lr) & GICH_LR_PHYSID_CPUID) >> GICH_LR_PHYSID_CPUID_SHIFT)
#define MK_LR_PEND(src, irq) \
(GICH_LR_PENDING_BIT | ((src) << GICH_LR_PHYSID_CPUID_SHIFT) | (irq))
@@ -871,9 +943,7 @@ static void vgic_retire_disabled_irqs(struct kvm_vcpu *vcpu)
int irq = vgic_cpu->vgic_lr[lr] & GICH_LR_VIRTUALID;
if (!vgic_irq_is_enabled(vcpu, irq)) {
- vgic_cpu->vgic_irq_lr_map[irq] = LR_EMPTY;
- clear_bit(lr, vgic_cpu->lr_used);
- vgic_cpu->vgic_lr[lr] &= ~GICH_LR_STATE;
+ vgic_retire_lr(lr, irq, vgic_cpu);
if (vgic_irq_is_active(vcpu, irq))
vgic_irq_clear_active(vcpu, irq);
}
@@ -1675,6 +1745,14 @@ static int vgic_attr_regs_access(struct kvm_device *dev,
}
}
+ /*
+ * Move all pending IRQs from the LRs on all VCPUs so the pending
+ * state can be properly represented in the register state accessible
+ * through this API.
+ */
+ kvm_for_each_vcpu(c, tmp_vcpu, dev->kvm)
+ vgic_unqueue_irqs(tmp_vcpu);
+
offset -= r->base;
r->handle_mmio(vcpu, &mmio, offset);