KVM: arm64: Don't initialize idreg debugfs w/ preemption disabled

KVM: arm64: Don't initialize idreg debugfs w/ preemption disabled

Testing KVM with DEBUG_ATOMIC_SLEEP enabled doesn't get far before hitting the
first splat:

  BUG: sleeping function called from invalid context at kernel/locking/rwsem.c:1578
  in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 13062, name: vgic_lpi_stress
  preempt_count: 1, expected: 0
  2 locks held by vgic_lpi_stress/13062:
   #0: ffff080084553240 (&vcpu->mutex){+.+.}-{3:3}, at: kvm_vcpu_ioctl+0xc0/0x13f0
   #1: ffff800080485f08 (&kvm->arch.config_lock){+.+.}-{3:3}, at: kvm_arch_vcpu_ioctl+0xd60/0x1788
  CPU: 19 PID: 13062 Comm: vgic_lpi_stress Tainted: G        W  O       6.8.0-dbg-DEV #1
  Call trace:
   dump_backtrace+0xf8/0x148
   show_stack+0x20/0x38
   dump_stack_lvl+0xb4/0xf8
   dump_stack+0x18/0x40
   __might_resched+0x248/0x2a0
   __might_sleep+0x50/0x88
   down_write+0x30/0x150
   start_creating+0x90/0x1a0
   __debugfs_create_file+0x5c/0x1b0
   debugfs_create_file+0x34/0x48
   kvm_reset_sys_regs+0x120/0x1e8
   kvm_reset_vcpu+0x148/0x270
   kvm_arch_vcpu_ioctl+0xddc/0x1788
   kvm_vcpu_ioctl+0xb6c/0x13f0
   __arm64_sys_ioctl+0x98/0xd8
   invoke_syscall+0x48/0x108
   el0_svc_common+0xb4/0xf0
   do_el0_svc+0x24/0x38
   el0_svc+0x54/0x128
   el0t_64_sync_handler+0x68/0xc0
   el0t_64_sync+0x1a8/0x1b0

kvm_reset_vcpu() disables preemption as it needs to unload vCPU state
from the CPU to twiddle with it, which subsequently explodes when
taking the parent inode's rwsem while creating the idreg debugfs file.

Fix it by moving the initialization to kvm_arch_create_vm_debugfs().

Fixes: 891766581dea ("KVM: arm64: Add debugfs file for guest's ID registers")
Reviewed-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20240227094115.1723330-3-oliver.upton@linux.dev
Signed-off-by: Oliver Upton <oliver.upton@linux.dev>