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KVM: arm64: vgic-its: Connect LPIs to the VGIC emulation

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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 <[email protected]>
Reviewed-by: Marc Zyngier <[email protected]>
Tested-by: Eric Auger <[email protected]>
Signed-off-by: Marc Zyngier <[email protected]>
This commit is contained in:
Andre Przywara 2016-07-15 12:43:33 +01:00 • committed by Marc Zyngier
commit 3802411d01
5 changed files with 73 additions and 6 deletions
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6
include/kvm/arm_vgic.h
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@ -77,6 +77,7 @@ enum vgic_irq_config {
struct vgic_irq {
spinlock_t irq_lock; /* Protects the content of the struct */
struct list_head lpi_list; /* Used to link all LPIs together */
struct list_head ap_list;
struct kvm_vcpu *vcpu; /* SGIs and PPIs: The VCPU
@ -193,6 +194,11 @@ struct vgic_dist {
* GICv3 spec: 6.1.2 "LPI Configuration tables"
*/
u64 propbaser;
/* Protects the lpi_list and the count value below. */
spinlock_t lpi_list_lock;
struct list_head lpi_list_head;
int lpi_list_count;
};
struct vgic_v2_cpu_if {