[PATCH v6 23/24] KVM: arm64: vgic-its: Fix pending table sync

Eric Auger
2017-05-04T11:44:08Z

In its_sync_lpi_pending_table() we currently ignore the
target_vcpu of the LPIs. We sync the pending bit found in
the vcpu pending table even if the LPI is not targeting it.

Also in vgic_its_cmd_handle_invall() we are supposed to
read the config table data for the LPIs associated to the
collection ID. At the moment we refresh all LPI config
information.

This patch passes a vpcu to vgic_copy_lpi_list() so that
this latter returns a snapshot of the LPIs targeting this
CPU and only those.

Signed-off-by: Eric Auger <eric.auger@redhat.com>
---
virt/kvm/arm/vgic/vgic-its.c | 24 ++++++++++++------------
1 file changed, 12 insertions(+), 12 deletions(-)

diff --git a/virt/kvm/arm/vgic/vgic-its.c b/virt/kvm/arm/vgic/vgic-its.c
index 376d963..3c114b1 100644
--- a/virt/kvm/arm/vgic/vgic-its.c
+++ b/virt/kvm/arm/vgic/vgic-its.c
@@ -278,13 +278,13 @@ static int update_lpi_config(struct kvm *kvm, struct vgic_irq *irq,
}

/*
- * Create a snapshot of the current LPI list, so that we can enumerate all
- * LPIs without holding any lock.
- * Returns the array length and puts the kmalloc'ed array into intid_ptr.
+ * Create a snapshot of the current LPIs targeting @vcpu, so that we can
+ * enumerate those LPIs without holding any lock.
+ * Returns their number and puts the kmalloc'ed array into intid_ptr.
*/
-static int vgic_copy_lpi_list(struct kvm *kvm, u32 **intid_ptr)
+static int vgic_copy_lpi_list(struct kvm_vcpu *vcpu, u32 **intid_ptr)
{
- struct vgic_dist *dist = &kvm->arch.vgic;
+ struct vgic_dist *dist = &vcpu->kvm->arch.vgic;
struct vgic_irq *irq;
u32 *intids;
int irq_count = dist->lpi_list_count, i = 0;
@@ -303,14 +303,14 @@ static int vgic_copy_lpi_list(struct kvm *kvm, u32 **intid_ptr)
spin_lock(&dist->lpi_list_lock);
list_for_each_entry(irq, &dist->lpi_list_head, lpi_list) {
/* We don't need to "get" the IRQ, as we hold the list lock. */
- intids[i] = irq->intid;
- if (++i == irq_count)
- break;
+ if (irq->target_vcpu != vcpu)
+ continue;
+ intids[i++] = irq->intid;
}
spin_unlock(&dist->lpi_list_lock);

*intid_ptr = intids;
- return irq_count;
+ return i;
}

/*
@@ -359,7 +359,7 @@ static u32 max_lpis_propbaser(u64 propbaser)
}

/*
- * Scan the whole LPI pending table and sync the pending bit in there
+ * Sync the pending table pending bit of LPIs targeting @vcpu
* with our own data structures. This relies on the LPI being
* mapped before.
*/
@@ -372,7 +372,7 @@ static int its_sync_lpi_pending_table(struct kvm_vcpu *vcpu)
u32 *intids;
int nr_irqs, i;

- nr_irqs = vgic_copy_lpi_list(vcpu->kvm, &intids);
+ nr_irqs = vgic_copy_lpi_list(vcpu, &intids);
if (nr_irqs < 0)
return nr_irqs;

@@ -1055,7 +1055,7 @@ static int vgic_its_cmd_handle_invall(struct kvm *kvm, struct vgic_its *its,

vcpu = kvm_get_vcpu(kvm, collection->target_addr);

- irq_count = vgic_copy_lpi_list(kvm, &intids);
+ irq_count = vgic_copy_lpi_list(vcpu, &intids);
if (irq_count < 0)
return irq_count;

--
2.5.5