[PATCH 2/4] KVM: arm/arm64: vgic: Add group field to struct irq

Christoffer Dall
2018-06-24T22:11:01Z

In preparation for proper group 0 and group 1 support in the vgic, we
add a field in the struct irq to store the group of all interrupts.

We initialize the group to group 0 when emulating GICv2 and to group 1
when emulating GICv3, just like we treat them today. LPIs are always
group 1. We also continue to ignore writes from the guest, preserving
existing functionality, for now.

Finally, we also add this field to the vgic debug logic to show the
group for all interrupts.

Signed-off-by: Christoffer Dall <christoffer.dall@arm.com>
---
include/kvm/arm_vgic.h | 1 +
virt/kvm/arm/vgic/vgic-debug.c | 8 +++++---
virt/kvm/arm/vgic/vgic-init.c | 11 +++++++++--
virt/kvm/arm/vgic/vgic-its.c | 1 +
4 files changed, 16 insertions(+), 5 deletions(-)

diff --git a/include/kvm/arm_vgic.h b/include/kvm/arm_vgic.h
index cfdd2484cc42..d2d578d099de 100644
--- a/include/kvm/arm_vgic.h
+++ b/include/kvm/arm_vgic.h
@@ -133,6 +133,7 @@ struct vgic_irq {
u8 source; /* GICv2 SGIs only */
u8 active_source; /* GICv2 SGIs only */
u8 priority;
+ u8 group; /* 0 == group 0, 1 == group 1 */
enum vgic_irq_config config; /* Level or edge */

/*
diff --git a/virt/kvm/arm/vgic/vgic-debug.c b/virt/kvm/arm/vgic/vgic-debug.c
index c589d4c2b478..d3a403f63010 100644
--- a/virt/kvm/arm/vgic/vgic-debug.c
+++ b/virt/kvm/arm/vgic/vgic-debug.c
@@ -148,6 +148,7 @@ static void print_dist_state(struct seq_file *s, struct vgic_dist *dist)

seq_printf(s, "P=pending_latch, L=line_level, A=active\n");
seq_printf(s, "E=enabled, H=hw, C=config (level=1, edge=0)\n");
+ seq_printf(s, "G=group\n");
}

static void print_header(struct seq_file *s, struct vgic_irq *irq,
@@ -162,8 +163,8 @@ static void print_header(struct seq_file *s, struct vgic_irq *irq,
}

seq_printf(s, "\n");
- seq_printf(s, "%s%2d TYP ID TGT_ID PLAEHC HWID TARGET SRC PRI VCPU_ID\n", hdr, id);
- seq_printf(s, "---------------------------------------------------------------\n");
+ seq_printf(s, "%s%2d TYP ID TGT_ID PLAEHCG HWID TARGET SRC PRI VCPU_ID\n", hdr, id);
+ seq_printf(s, "----------------------------------------------------------------\n");
}

static void print_irq_state(struct seq_file *s, struct vgic_irq *irq,
@@ -182,7 +183,7 @@ static void print_irq_state(struct seq_file *s, struct vgic_irq *irq,

seq_printf(s, " %s %4d "
" %2d "
- "%d%d%d%d%d%d "
+ "%d%d%d%d%d%d%d "
"%8d "
"%8x "
" %2x "
@@ -197,6 +198,7 @@ static void print_irq_state(struct seq_file *s, struct vgic_irq *irq,
irq->enabled,
irq->hw,
irq->config == VGIC_CONFIG_LEVEL,
+ irq->group,
irq->hwintid,
irq->mpidr,
irq->source,
diff --git a/virt/kvm/arm/vgic/vgic-init.c b/virt/kvm/arm/vgic/vgic-init.c
index 2673efce65f3..146a1bbb05c8 100644
--- a/virt/kvm/arm/vgic/vgic-init.c
+++ b/virt/kvm/arm/vgic/vgic-init.c
@@ -175,10 +175,13 @@ static int kvm_vgic_dist_init(struct kvm *kvm, unsigned int nr_spis)
irq->vcpu = NULL;
irq->target_vcpu = vcpu0;
kref_init(&irq->refcount);
- if (dist->vgic_model == KVM_DEV_TYPE_ARM_VGIC_V2)
+ if (dist->vgic_model == KVM_DEV_TYPE_ARM_VGIC_V2) {
irq->targets = 0;
- else
+ irq->group = 0;
+ } else {
irq->mpidr = 0;
+ irq->group = 1;
+ }
}
return 0;
}
@@ -227,6 +230,10 @@ int kvm_vgic_vcpu_init(struct kvm_vcpu *vcpu)
/* PPIs */
irq->config = VGIC_CONFIG_LEVEL;
}
+ if (dist->vgic_model == KVM_DEV_TYPE_ARM_VGIC_V2)
+ irq->group = 0;
+ else
+ irq->group = 1;
}

if (!irqchip_in_kernel(vcpu->kvm))
diff --git a/virt/kvm/arm/vgic/vgic-its.c b/virt/kvm/arm/vgic/vgic-its.c
index 4ed79c939fb4..92840c06fcd7 100644
--- a/virt/kvm/arm/vgic/vgic-its.c
+++ b/virt/kvm/arm/vgic/vgic-its.c
@@ -71,6 +71,7 @@ static struct vgic_irq *vgic_add_lpi(struct kvm *kvm, u32 intid,
kref_init(&irq->refcount);
irq->intid = intid;
irq->target_vcpu = vcpu;
+ irq->group = 1;

spin_lock_irqsave(&dist->lpi_list_lock, flags);

--
2.17.1