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powerpc.c

/*
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License, version 2, as
 * published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 *
 * Copyright IBM Corp. 2007
 *
 * Authors: Hollis Blanchard <hollisb@us.ibm.com>
 *          Christian Ehrhardt <ehrhardt@linux.vnet.ibm.com>
 */

#include <linux/errno.h>
#include <linux/err.h>
#include <linux/kvm_host.h>
#include <linux/module.h>
#include <linux/vmalloc.h>
#include <linux/fs.h>
#include <asm/cputable.h>
#include <asm/uaccess.h>
#include <asm/kvm_ppc.h>


gfn_t unalias_gfn(struct kvm *kvm, gfn_t gfn)
{
      return gfn;
}

int kvm_cpu_has_interrupt(struct kvm_vcpu *v)
{
      return !!(v->arch.pending_exceptions);
}

int kvm_arch_vcpu_runnable(struct kvm_vcpu *v)
{
      return !(v->arch.msr & MSR_WE);
}


int kvmppc_emulate_mmio(struct kvm_run *run, struct kvm_vcpu *vcpu)
{
      enum emulation_result er;
      int r;

      er = kvmppc_emulate_instruction(run, vcpu);
      switch (er) {
      case EMULATE_DONE:
            /* Future optimization: only reload non-volatiles if they were
             * actually modified. */
            r = RESUME_GUEST_NV;
            break;
      case EMULATE_DO_MMIO:
            run->exit_reason = KVM_EXIT_MMIO;
            /* We must reload nonvolatiles because "update" load/store
             * instructions modify register state. */
            /* Future optimization: only reload non-volatiles if they were
             * actually modified. */
            r = RESUME_HOST_NV;
            break;
      case EMULATE_FAIL:
            /* XXX Deliver Program interrupt to guest. */
            printk(KERN_EMERG "%s: emulation failed (%08x)\n", __func__,
                   vcpu->arch.last_inst);
            r = RESUME_HOST;
            break;
      default:
            BUG();
      }

      return r;
}

void kvm_arch_hardware_enable(void *garbage)
{
}

void kvm_arch_hardware_disable(void *garbage)
{
}

int kvm_arch_hardware_setup(void)
{
      return 0;
}

void kvm_arch_hardware_unsetup(void)
{
}

void kvm_arch_check_processor_compat(void *rtn)
{
      int r;

      if (strcmp(cur_cpu_spec->platform, "ppc440") == 0)
            r = 0;
      else
            r = -ENOTSUPP;

      *(int *)rtn = r;
}

struct kvm *kvm_arch_create_vm(void)
{
      struct kvm *kvm;

      kvm = kzalloc(sizeof(struct kvm), GFP_KERNEL);
      if (!kvm)
            return ERR_PTR(-ENOMEM);

      return kvm;
}

static void kvmppc_free_vcpus(struct kvm *kvm)
{
      unsigned int i;

      for (i = 0; i < KVM_MAX_VCPUS; ++i) {
            if (kvm->vcpus[i]) {
                  kvm_arch_vcpu_free(kvm->vcpus[i]);
                  kvm->vcpus[i] = NULL;
            }
      }
}

void kvm_arch_destroy_vm(struct kvm *kvm)
{
      kvmppc_free_vcpus(kvm);
      kvm_free_physmem(kvm);
      kfree(kvm);
}

int kvm_dev_ioctl_check_extension(long ext)
{
      int r;

      switch (ext) {
      case KVM_CAP_USER_MEMORY:
            r = 1;
            break;
      case KVM_CAP_COALESCED_MMIO:
            r = KVM_COALESCED_MMIO_PAGE_OFFSET;
            break;
      default:
            r = 0;
            break;
      }
      return r;

}

long kvm_arch_dev_ioctl(struct file *filp,
                        unsigned int ioctl, unsigned long arg)
{
      return -EINVAL;
}

int kvm_arch_set_memory_region(struct kvm *kvm,
                               struct kvm_userspace_memory_region *mem,
                               struct kvm_memory_slot old,
                               int user_alloc)
{
      return 0;
}

void kvm_arch_flush_shadow(struct kvm *kvm)
{
}

struct kvm_vcpu *kvm_arch_vcpu_create(struct kvm *kvm, unsigned int id)
{
      struct kvm_vcpu *vcpu;
      int err;

      vcpu = kmem_cache_zalloc(kvm_vcpu_cache, GFP_KERNEL);
      if (!vcpu) {
            err = -ENOMEM;
            goto out;
      }

      err = kvm_vcpu_init(vcpu, kvm, id);
      if (err)
            goto free_vcpu;

      return vcpu;

free_vcpu:
      kmem_cache_free(kvm_vcpu_cache, vcpu);
out:
      return ERR_PTR(err);
}

void kvm_arch_vcpu_free(struct kvm_vcpu *vcpu)
{
      kvm_vcpu_uninit(vcpu);
      kmem_cache_free(kvm_vcpu_cache, vcpu);
}

void kvm_arch_vcpu_destroy(struct kvm_vcpu *vcpu)
{
      kvm_arch_vcpu_free(vcpu);
}

int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
{
      unsigned int priority = exception_priority[BOOKE_INTERRUPT_DECREMENTER];

      return test_bit(priority, &vcpu->arch.pending_exceptions);
}

static void kvmppc_decrementer_func(unsigned long data)
{
      struct kvm_vcpu *vcpu = (struct kvm_vcpu *)data;

      kvmppc_queue_exception(vcpu, BOOKE_INTERRUPT_DECREMENTER);

      if (waitqueue_active(&vcpu->wq)) {
            wake_up_interruptible(&vcpu->wq);
            vcpu->stat.halt_wakeup++;
      }
}

int kvm_arch_vcpu_init(struct kvm_vcpu *vcpu)
{
      setup_timer(&vcpu->arch.dec_timer, kvmppc_decrementer_func,
                  (unsigned long)vcpu);

      return 0;
}

void kvm_arch_vcpu_uninit(struct kvm_vcpu *vcpu)
{
}

void kvm_arch_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
{
}

void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
{
}

int kvm_arch_vcpu_ioctl_debug_guest(struct kvm_vcpu *vcpu,
                                    struct kvm_debug_guest *dbg)
{
      return -ENOTSUPP;
}

static void kvmppc_complete_dcr_load(struct kvm_vcpu *vcpu,
                                     struct kvm_run *run)
{
      u32 *gpr = &vcpu->arch.gpr[vcpu->arch.io_gpr];
      *gpr = run->dcr.data;
}

static void kvmppc_complete_mmio_load(struct kvm_vcpu *vcpu,
                                      struct kvm_run *run)
{
      u32 *gpr = &vcpu->arch.gpr[vcpu->arch.io_gpr];

      if (run->mmio.len > sizeof(*gpr)) {
            printk(KERN_ERR "bad MMIO length: %d\n", run->mmio.len);
            return;
      }

      if (vcpu->arch.mmio_is_bigendian) {
            switch (run->mmio.len) {
            case 4: *gpr = *(u32 *)run->mmio.data; break;
            case 2: *gpr = *(u16 *)run->mmio.data; break;
            case 1: *gpr = *(u8 *)run->mmio.data; break;
            }
      } else {
            /* Convert BE data from userland back to LE. */
            switch (run->mmio.len) {
            case 4: *gpr = ld_le32((u32 *)run->mmio.data); break;
            case 2: *gpr = ld_le16((u16 *)run->mmio.data); break;
            case 1: *gpr = *(u8 *)run->mmio.data; break;
            }
      }
}

int kvmppc_handle_load(struct kvm_run *run, struct kvm_vcpu *vcpu,
                       unsigned int rt, unsigned int bytes, int is_bigendian)
{
      if (bytes > sizeof(run->mmio.data)) {
            printk(KERN_ERR "%s: bad MMIO length: %d\n", __func__,
                   run->mmio.len);
      }

      run->mmio.phys_addr = vcpu->arch.paddr_accessed;
      run->mmio.len = bytes;
      run->mmio.is_write = 0;

      vcpu->arch.io_gpr = rt;
      vcpu->arch.mmio_is_bigendian = is_bigendian;
      vcpu->mmio_needed = 1;
      vcpu->mmio_is_write = 0;

      return EMULATE_DO_MMIO;
}

int kvmppc_handle_store(struct kvm_run *run, struct kvm_vcpu *vcpu,
                        u32 val, unsigned int bytes, int is_bigendian)
{
      void *data = run->mmio.data;

      if (bytes > sizeof(run->mmio.data)) {
            printk(KERN_ERR "%s: bad MMIO length: %d\n", __func__,
                   run->mmio.len);
      }

      run->mmio.phys_addr = vcpu->arch.paddr_accessed;
      run->mmio.len = bytes;
      run->mmio.is_write = 1;
      vcpu->mmio_needed = 1;
      vcpu->mmio_is_write = 1;

      /* Store the value at the lowest bytes in 'data'. */
      if (is_bigendian) {
            switch (bytes) {
            case 4: *(u32 *)data = val; break;
            case 2: *(u16 *)data = val; break;
            case 1: *(u8  *)data = val; break;
            }
      } else {
            /* Store LE value into 'data'. */
            switch (bytes) {
            case 4: st_le32(data, val); break;
            case 2: st_le16(data, val); break;
            case 1: *(u8 *)data = val; break;
            }
      }

      return EMULATE_DO_MMIO;
}

int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu, struct kvm_run *run)
{
      int r;
      sigset_t sigsaved;

      vcpu_load(vcpu);

      if (vcpu->sigset_active)
            sigprocmask(SIG_SETMASK, &vcpu->sigset, &sigsaved);

      if (vcpu->mmio_needed) {
            if (!vcpu->mmio_is_write)
                  kvmppc_complete_mmio_load(vcpu, run);
            vcpu->mmio_needed = 0;
      } else if (vcpu->arch.dcr_needed) {
            if (!vcpu->arch.dcr_is_write)
                  kvmppc_complete_dcr_load(vcpu, run);
            vcpu->arch.dcr_needed = 0;
      }

      kvmppc_check_and_deliver_interrupts(vcpu);

      local_irq_disable();
      kvm_guest_enter();
      r = __kvmppc_vcpu_run(run, vcpu);
      kvm_guest_exit();
      local_irq_enable();

      if (vcpu->sigset_active)
            sigprocmask(SIG_SETMASK, &sigsaved, NULL);

      vcpu_put(vcpu);

      return r;
}

int kvm_vcpu_ioctl_interrupt(struct kvm_vcpu *vcpu, struct kvm_interrupt *irq)
{
      kvmppc_queue_exception(vcpu, BOOKE_INTERRUPT_EXTERNAL);

      if (waitqueue_active(&vcpu->wq)) {
            wake_up_interruptible(&vcpu->wq);
            vcpu->stat.halt_wakeup++;
      }

      return 0;
}

int kvm_arch_vcpu_ioctl_get_mpstate(struct kvm_vcpu *vcpu,
                                    struct kvm_mp_state *mp_state)
{
      return -EINVAL;
}

int kvm_arch_vcpu_ioctl_set_mpstate(struct kvm_vcpu *vcpu,
                                    struct kvm_mp_state *mp_state)
{
      return -EINVAL;
}

long kvm_arch_vcpu_ioctl(struct file *filp,
                         unsigned int ioctl, unsigned long arg)
{
      struct kvm_vcpu *vcpu = filp->private_data;
      void __user *argp = (void __user *)arg;
      long r;

      switch (ioctl) {
      case KVM_INTERRUPT: {
            struct kvm_interrupt irq;
            r = -EFAULT;
            if (copy_from_user(&irq, argp, sizeof(irq)))
                  goto out;
            r = kvm_vcpu_ioctl_interrupt(vcpu, &irq);
            break;
      }
      default:
            r = -EINVAL;
      }

out:
      return r;
}

int kvm_vm_ioctl_get_dirty_log(struct kvm *kvm, struct kvm_dirty_log *log)
{
      return -ENOTSUPP;
}

long kvm_arch_vm_ioctl(struct file *filp,
                       unsigned int ioctl, unsigned long arg)
{
      long r;

      switch (ioctl) {
      default:
            r = -EINVAL;
      }

      return r;
}

int kvm_arch_init(void *opaque)
{
      return 0;
}

void kvm_arch_exit(void)
{
}

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