arch/mips/kvm/interrupt.c

   1 /*
   2  * This file is subject to the terms and conditions of the GNU General Public
   3  * License.  See the file "COPYING" in the main directory of this archive
   4  * for more details.
   5  *
   6  * KVM/MIPS: Interrupt delivery
   7  *
   8  * Copyright (C) 2012  MIPS Technologies, Inc.  All rights reserved.
   9  * Authors: Sanjay Lal <sanjayl@kymasys.com>
  10  */
  11
  12 #include <linux/errno.h>
  13 #include <linux/err.h>
  14 #include <linux/vmalloc.h>
  15 #include <linux/fs.h>
  16 #include <linux/memblock.h>
  17 #include <asm/page.h>
  18 #include <asm/cacheflush.h>
  19
  20 #include <linux/kvm_host.h>
  21
  22 #include "interrupt.h"
  23
  24 void kvm_mips_deliver_interrupts(struct kvm_vcpu *vcpu, u32 cause)
  25 {
  26         unsigned long *pending = &vcpu->arch.pending_exceptions;
  27         unsigned long *pending_clr = &vcpu->arch.pending_exceptions_clr;
  28         unsigned int priority;
  29
  30         if (!(*pending) && !(*pending_clr))
  31                 return;
  32
  33         priority = __ffs(*pending_clr);
  34         while (priority <= MIPS_EXC_MAX) {
  35                 kvm_mips_callbacks->irq_clear(vcpu, priority, cause);
  36
  37                 priority = find_next_bit(pending_clr,
  38                                          BITS_PER_BYTE * sizeof(*pending_clr),
  39                                          priority + 1);
  40         }
  41
  42         priority = __ffs(*pending);
  43         while (priority <= MIPS_EXC_MAX) {
  44                 kvm_mips_callbacks->irq_deliver(vcpu, priority, cause);
  45
  46                 priority = find_next_bit(pending,
  47                                          BITS_PER_BYTE * sizeof(*pending),
  48                                          priority + 1);
  49         }
  50
  51 }
  52
  53 int kvm_mips_pending_timer(struct kvm_vcpu *vcpu)
  54 {
  55         return test_bit(MIPS_EXC_INT_TIMER, &vcpu->arch.pending_exceptions);
  56 }