LoongArch: KVM: Harden interrupt injection

API kvm_vcpu_ioctl_interrupt() is mainly to used to deliver interrupt
from user mode, and internal APIs kvm_queue_irq() and kvm_dequeue_irq()
are used in kernel mode, also moves IPI interrupt handling within lock
protection.

Also this patch replaces kvm_err() with WARN_ONCE() to avoid noise
kernel log.

---
v2 ... v3:
  1. Split the patches into three smaller ones, the first patch removes
     old default case and kvm_err() since it is impossible to happen.
     And the second patch replaces kvm_err() with WARN_ONCE().
     
v1 ... v2:
  1. Add border check with ipnum in eiointc_set_sw_coreisr() and
     eiointc_update_irq(), so that injected interrupt vector is valid.

  2. Move IPI inject and ack within lock to avoid contention in
     ipi_set() and ipi_clear().

  3. Add kvm_arch_irqchip_in_kernel() check in user mode irq injection
    in function kvm_vcpu_ioctl_interrupt(), contention of user mode irq
    injection is assured from user mode VMM.
---
Bibo Mao (3):
  LoongArch: KVM: Set default MAILBOX access size with 8
  LoongArch: KVM: Replace kvm_err() with WARN_ONCE()
  LoongArch: KVM: Use internal API to deliver interrupt in kernel mode

 arch/loongarch/kvm/exit.c         | 15 ++++-----
 arch/loongarch/kvm/intc/dmsintc.c | 15 +++++----
 arch/loongarch/kvm/intc/eiointc.c | 32 ++++++++++--------
 arch/loongarch/kvm/intc/ipi.c     | 55 ++++++++++++++-----------------
 arch/loongarch/kvm/intc/pch_pic.c | 12 +++----
 arch/loongarch/kvm/vcpu.c         |  5 ++-
 6 files changed, 67 insertions(+), 67 deletions(-)


base-commit: dc59e4fea9d83f03bad6bddf3fa2e52491777482
-- 
2.39.3