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authorAndre Przywara <andre.przywara@arm.com>2016-07-15 12:43:33 +0100
committerMarc Zyngier <marc.zyngier@arm.com>2016-07-18 18:14:36 +0100
commit3802411d01880c4283426d22653e011159b1c947 (patch)
tree07aa88896048f97dc8c8a3156c4468410c6692df /virt/kvm/arm/vgic/vgic-v3.c
parent424c33830f53f248a68da125e70d9a4d95a8e010 (diff)
downloadlinux-stericsson-3802411d01880c4283426d22653e011159b1c947.tar.gz
KVM: arm64: vgic-its: Connect LPIs to the VGIC emulation
LPIs are dynamically created (mapped) at guest runtime and their actual number can be quite high, but is mostly assigned using a very sparse allocation scheme. So arrays are not an ideal data structure to hold the information. We use a spin-lock protected linked list to hold all mapped LPIs, represented by their struct vgic_irq. This lock is grouped between the ap_list_lock and the vgic_irq lock in our locking order. Also we store a pointer to that struct vgic_irq in our struct its_itte, so we can easily access it. Eventually we call our new vgic_get_lpi() from vgic_get_irq(), so the VGIC code gets transparently access to LPIs. Signed-off-by: Andre Przywara <andre.przywara@arm.com> Reviewed-by: Marc Zyngier <marc.zyngier@arm.com> Tested-by: Eric Auger <eric.auger@redhat.com> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
Diffstat (limited to 'virt/kvm/arm/vgic/vgic-v3.c')
-rw-r--r--virt/kvm/arm/vgic/vgic-v3.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/virt/kvm/arm/vgic/vgic-v3.c b/virt/kvm/arm/vgic/vgic-v3.c
index 6f8f31f910e7..0506543df38a 100644
--- a/virt/kvm/arm/vgic/vgic-v3.c
+++ b/virt/kvm/arm/vgic/vgic-v3.c
@@ -81,6 +81,8 @@ void vgic_v3_fold_lr_state(struct kvm_vcpu *vcpu)
else
intid = val & GICH_LR_VIRTUALID;
irq = vgic_get_irq(vcpu->kvm, vcpu, intid);
+ if (!irq) /* An LPI could have been unmapped. */
+ continue;
spin_lock(&irq->irq_lock);