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| author | Andre Przywara | 2016-07-15 13:43:33 +0200 |
|---|---|---|
| committer | Marc Zyngier | 2016-07-18 19:14:36 +0200 |
| commit | 3802411d01880c4283426d22653e011159b1c947 (patch) | |
| tree | 07aa88896048f97dc8c8a3156c4468410c6692df /virt/kvm/arm/vgic/vgic-v3.c | |
| parent | KVM: arm64: vgic-its: Implement basic ITS register handlers (diff) | |
| download | kernel-qcow2-linux-3802411d01880c4283426d22653e011159b1c947.tar.gz kernel-qcow2-linux-3802411d01880c4283426d22653e011159b1c947.tar.xz kernel-qcow2-linux-3802411d01880c4283426d22653e011159b1c947.zip | |
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.c | 2 |
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); |