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KVM: arm64: vgic-its: Allow updates of LPI configuration table

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The (system-wide) LPI configuration table is held in a table in
(guest) memory. To achieve reasonable performance, we cache this data
in our struct vgic_irq. If the guest updates the configuration data
(which consists of the enable bit and the priority value), it issues
an INV or INVALL command to allow us to update our information.
Provide functions that update that information for one LPI or all LPIs
mapped to a specific collection.

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>
This commit is contained in:
Andre Przywara 2016-07-15 12:43:35 +01:00 committed by Marc Zyngier
parent 33d3bc9556
commit f9f77af9e2
1 changed files with 39 additions and 0 deletions
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39
virt/kvm/arm/vgic/vgic-its.c
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@ -68,6 +68,45 @@ struct its_itte {
*/
#define CBASER_ADDRESS(x) ((x) & GENMASK_ULL(47, 12))
#define PENDBASER_ADDRESS(x) ((x) & GENMASK_ULL(47, 16))
#define PROPBASER_ADDRESS(x) ((x) & GENMASK_ULL(47, 12))
#define GIC_LPI_OFFSET 8192
#define LPI_PROP_ENABLE_BIT(p) ((p) & LPI_PROP_ENABLED)
#define LPI_PROP_PRIORITY(p) ((p) & 0xfc)
/*
* Reads the configuration data for a given LPI from guest memory and
* updates the fields in struct vgic_irq.
* If filter_vcpu is not NULL, applies only if the IRQ is targeting this
* VCPU. Unconditionally applies if filter_vcpu is NULL.
*/
static int update_lpi_config(struct kvm *kvm, struct vgic_irq *irq,
struct kvm_vcpu *filter_vcpu)
{
u64 propbase = PROPBASER_ADDRESS(kvm->arch.vgic.propbaser);
u8 prop;
int ret;
ret = kvm_read_guest(kvm, propbase + irq->intid - GIC_LPI_OFFSET,
&prop, 1);
if (ret)
return ret;
spin_lock(&irq->irq_lock);
if (!filter_vcpu || filter_vcpu == irq->target_vcpu) {
irq->priority = LPI_PROP_PRIORITY(prop);
irq->enabled = LPI_PROP_ENABLE_BIT(prop);
vgic_queue_irq_unlock(kvm, irq);
} else {
spin_unlock(&irq->irq_lock);
}
return 0;
}
/*
* Create a snapshot of the current LPI list, so that we can enumerate all