[PATCH v5 10/20] KVM: ARM: vgic: move underflow handling to vgic_ops

[Marc Zyngier]

Move the code dealing with LR underflow handling to its own functions,
and make them accessible through vgic_ops.

Acked-by: Catalin Marinas <catalin.mari...@arm.com>
Reviewed-by: Christoffer Dall <christoffer.d...@linaro.org>
Signed-off-by: Marc Zyngier <marc.zyng...@arm.com>
---
 include/kvm/arm_vgic.h |  2 ++
 virt/kvm/arm/vgic.c    | 28 +++++++++++++++++++++++++---
 2 files changed, 27 insertions(+), 3 deletions(-)

diff --git a/include/kvm/arm_vgic.h b/include/kvm/arm_vgic.h
index 4857508..cdfa5d9 100644
--- a/include/kvm/arm_vgic.h
+++ b/include/kvm/arm_vgic.h
@@ -88,6 +88,8 @@ struct vgic_ops {
        u64     (*get_elrsr)(const struct kvm_vcpu *vcpu);
        u64     (*get_eisr)(const struct kvm_vcpu *vcpu);
        u32     (*get_interrupt_status)(const struct kvm_vcpu *vcpu);
+       void    (*enable_underflow)(struct kvm_vcpu *vcpu);
+       void    (*disable_underflow)(struct kvm_vcpu *vcpu);
 };
 
 struct vgic_dist {
diff --git a/virt/kvm/arm/vgic.c b/virt/kvm/arm/vgic.c
index 9491c22..369016c 100644
--- a/virt/kvm/arm/vgic.c
+++ b/virt/kvm/arm/vgic.c
@@ -1047,6 +1047,16 @@ static u32 vgic_v2_get_interrupt_status(const struct 
kvm_vcpu *vcpu)
        return ret;
 }
 
+static void vgic_v2_enable_underflow(struct kvm_vcpu *vcpu)
+{
+       vcpu->arch.vgic_cpu.vgic_v2.vgic_hcr |= GICH_HCR_UIE;
+}
+
+static void vgic_v2_disable_underflow(struct kvm_vcpu *vcpu)
+{
+       vcpu->arch.vgic_cpu.vgic_v2.vgic_hcr &= ~GICH_HCR_UIE;
+}
+
 static const struct vgic_ops vgic_ops = {
        .get_lr                 = vgic_v2_get_lr,
        .set_lr                 = vgic_v2_set_lr,
@@ -1054,6 +1064,8 @@ static const struct vgic_ops vgic_ops = {
        .get_elrsr              = vgic_v2_get_elrsr,
        .get_eisr               = vgic_v2_get_eisr,
        .get_interrupt_status   = vgic_v2_get_interrupt_status,
+       .enable_underflow       = vgic_v2_enable_underflow,
+       .disable_underflow      = vgic_v2_disable_underflow,
 };
 
 static struct vgic_lr vgic_get_lr(const struct kvm_vcpu *vcpu, int lr)
@@ -1088,6 +1100,16 @@ static inline u32 vgic_get_interrupt_status(struct 
kvm_vcpu *vcpu)
        return vgic_ops.get_interrupt_status(vcpu);
 }
 
+static inline void vgic_enable_underflow(struct kvm_vcpu *vcpu)
+{
+       vgic_ops.enable_underflow(vcpu);
+}
+
+static inline void vgic_disable_underflow(struct kvm_vcpu *vcpu)
+{
+       vgic_ops.disable_underflow(vcpu);
+}
+
 static void vgic_retire_lr(int lr_nr, int irq, struct kvm_vcpu *vcpu)
 {
        struct vgic_cpu *vgic_cpu = &vcpu->arch.vgic_cpu;
@@ -1269,9 +1291,9 @@ static void __kvm_vgic_flush_hwstate(struct kvm_vcpu 
*vcpu)
 
 epilog:
        if (overflow) {
-               vgic_cpu->vgic_v2.vgic_hcr |= GICH_HCR_UIE;
+               vgic_enable_underflow(vcpu);
        } else {
-               vgic_cpu->vgic_v2.vgic_hcr &= ~GICH_HCR_UIE;
+               vgic_disable_underflow(vcpu);
                /*
                 * We're about to run this VCPU, and we've consumed
                 * everything the distributor had in store for
@@ -1324,7 +1346,7 @@ static bool vgic_process_maintenance(struct kvm_vcpu 
*vcpu)
        }
 
        if (status & INT_STATUS_UNDERFLOW)
-               vgic_cpu->vgic_v2.vgic_hcr &= ~GICH_HCR_UIE;
+               vgic_disable_underflow(vcpu);
 
        return level_pending;
 }
-- 
1.8.3.4

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