KVM: arm64: gic-v5: Initialise per-VM IRS state

A virtual GICv5 needs an emulated IRS in addition to the host IRS
state used to back VMTEs, VPEs, and ISTs. Without this, KVM can only
provide the CPU-local PPI state and cannot expose the IRS-backed SPI
and LPI configuration expected by a GICv5 guest.

Allocate the per-VM emulated IRS state when creating a virtual GICv5,
and initialise it from vgic_v5_init(). If userspace has not provided a
number of SPIs, use the GICv5 default of 32. The IRS init path
allocates the SPI state, initialises the virtual IRS register state,
and creates the backing SPI IST when SPIs are present.

Keep the per-VM IRS object alive for the lifetime of the virtual
GICv5.  vgic_v5_teardown() only unwinds resources allocated by
vgic_v5_init(), so failed initialisation can be retried, while
kvm_vgic_dist_destroy() frees the IRS object during final VGIC
destruction.

This gives virtual GICv5s the IRS backing required for SPIs and LPIs,
rather than being limited to PPIs only. Further patches add support
for SPI injection and lifecycle tracking.

Signed-off-by: Sascha Bischoff <sascha.bischoff@arm.com>
Link: https://patch.msgid.link/20260904113404.4051341-22-sascha.bischoff@arm.com
Signed-off-by: Marc Zyngier <maz@kernel.org>

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