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KVM: arm64: vgic-its: Spin off helper for finding ITS by doorbell addr

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The fast path will soon need to find an ITS by doorbell address, as the
translation caches will become local to an ITS. Spin off a helper to do
just that.

Signed-off-by: Oliver Upton <oliver.upton@linux.dev>
Link: https://lore.kernel.org/r/20240422200158.2606761-10-oliver.upton@linux.dev
Signed-off-by: Marc Zyngier <maz@kernel.org>
This commit is contained in:
Oliver Upton 2024-04-22 20:01:48 +00:00 committed by Marc Zyngier
parent 8201d1028c
commit dedfcd17fa
1 changed files with 21 additions and 14 deletions
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35
arch/arm64/kvm/vgic/vgic-its.c
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@ -511,9 +511,29 @@ static unsigned long vgic_mmio_read_its_idregs(struct kvm *kvm,
return 0;
}
static struct vgic_its *__vgic_doorbell_to_its(struct kvm *kvm, gpa_t db)
{
struct kvm_io_device *kvm_io_dev;
struct vgic_io_device *iodev;
kvm_io_dev = kvm_io_bus_get_dev(kvm, KVM_MMIO_BUS, db);
if (!kvm_io_dev)
return ERR_PTR(-EINVAL);
if (kvm_io_dev->ops != &kvm_io_gic_ops)
return ERR_PTR(-EINVAL);
iodev = container_of(kvm_io_dev, struct vgic_io_device, dev);
if (iodev->iodev_type != IODEV_ITS)
return ERR_PTR(-EINVAL);
return iodev->its;
}
static unsigned long vgic_its_cache_key(u32 devid, u32 eventid)
{
return (((unsigned long)devid) << VITS_TYPER_IDBITS) | eventid;
}
static struct vgic_irq *__vgic_its_check_cache(struct vgic_dist *dist,
@ -721,8 +741,6 @@ int vgic_its_resolve_lpi(struct kvm *kvm, struct vgic_its *its,
struct vgic_its *vgic_msi_to_its(struct kvm *kvm, struct kvm_msi *msi)
{
u64 address;
struct kvm_io_device *kvm_io_dev;
struct vgic_io_device *iodev;
if (!vgic_has_its(kvm))
return ERR_PTR(-ENODEV);
@ -732,18 +750,7 @@ struct vgic_its *vgic_msi_to_its(struct kvm *kvm, struct kvm_msi *msi)
address = (u64)msi->address_hi << 32 | msi->address_lo;
kvm_io_dev = kvm_io_bus_get_dev(kvm, KVM_MMIO_BUS, address);
if (!kvm_io_dev)
return ERR_PTR(-EINVAL);
if (kvm_io_dev->ops != &kvm_io_gic_ops)
return ERR_PTR(-EINVAL);
iodev = container_of(kvm_io_dev, struct vgic_io_device, dev);
if (iodev->iodev_type != IODEV_ITS)
return ERR_PTR(-EINVAL);
return iodev->its;
return __vgic_doorbell_to_its(kvm, address);
}
/*