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-rw-r--r--virt/kvm/kvm_main.c104
1 files changed, 104 insertions, 0 deletions
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 4d0dd390aa50..1ceb96901f32 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -1593,6 +1593,88 @@ static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu *vcpu, sigset_t *sigset)
1593 return 0; 1593 return 0;
1594} 1594}
1595 1595
1596#ifdef __KVM_HAVE_MSIX
1597static int kvm_vm_ioctl_set_msix_nr(struct kvm *kvm,
1598 struct kvm_assigned_msix_nr *entry_nr)
1599{
1600 int r = 0;
1601 struct kvm_assigned_dev_kernel *adev;
1602
1603 mutex_lock(&kvm->lock);
1604
1605 adev = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
1606 entry_nr->assigned_dev_id);
1607 if (!adev) {
1608 r = -EINVAL;
1609 goto msix_nr_out;
1610 }
1611
1612 if (adev->entries_nr == 0) {
1613 adev->entries_nr = entry_nr->entry_nr;
1614 if (adev->entries_nr == 0 ||
1615 adev->entries_nr >= KVM_MAX_MSIX_PER_DEV) {
1616 r = -EINVAL;
1617 goto msix_nr_out;
1618 }
1619
1620 adev->host_msix_entries = kzalloc(sizeof(struct msix_entry) *
1621 entry_nr->entry_nr,
1622 GFP_KERNEL);
1623 if (!adev->host_msix_entries) {
1624 r = -ENOMEM;
1625 goto msix_nr_out;
1626 }
1627 adev->guest_msix_entries = kzalloc(
1628 sizeof(struct kvm_guest_msix_entry) *
1629 entry_nr->entry_nr, GFP_KERNEL);
1630 if (!adev->guest_msix_entries) {
1631 kfree(adev->host_msix_entries);
1632 r = -ENOMEM;
1633 goto msix_nr_out;
1634 }
1635 } else /* Not allowed set MSI-X number twice */
1636 r = -EINVAL;
1637msix_nr_out:
1638 mutex_unlock(&kvm->lock);
1639 return r;
1640}
1641
1642static int kvm_vm_ioctl_set_msix_entry(struct kvm *kvm,
1643 struct kvm_assigned_msix_entry *entry)
1644{
1645 int r = 0, i;
1646 struct kvm_assigned_dev_kernel *adev;
1647
1648 mutex_lock(&kvm->lock);
1649
1650 adev = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
1651 entry->assigned_dev_id);
1652
1653 if (!adev) {
1654 r = -EINVAL;
1655 goto msix_entry_out;
1656 }
1657
1658 for (i = 0; i < adev->entries_nr; i++)
1659 if (adev->guest_msix_entries[i].vector == 0 ||
1660 adev->guest_msix_entries[i].entry == entry->entry) {
1661 adev->guest_msix_entries[i].entry = entry->entry;
1662 adev->guest_msix_entries[i].vector = entry->gsi;
1663 adev->host_msix_entries[i].entry = entry->entry;
1664 break;
1665 }
1666 if (i == adev->entries_nr) {
1667 r = -ENOSPC;
1668 goto msix_entry_out;
1669 }
1670
1671msix_entry_out:
1672 mutex_unlock(&kvm->lock);
1673
1674 return r;
1675}
1676#endif
1677
1596static long kvm_vcpu_ioctl(struct file *filp, 1678static long kvm_vcpu_ioctl(struct file *filp,
1597 unsigned int ioctl, unsigned long arg) 1679 unsigned int ioctl, unsigned long arg)
1598{ 1680{
@@ -1917,7 +1999,29 @@ static long kvm_vm_ioctl(struct file *filp,
1917 vfree(entries); 1999 vfree(entries);
1918 break; 2000 break;
1919 } 2001 }
2002#ifdef __KVM_HAVE_MSIX
2003 case KVM_ASSIGN_SET_MSIX_NR: {
2004 struct kvm_assigned_msix_nr entry_nr;
2005 r = -EFAULT;
2006 if (copy_from_user(&entry_nr, argp, sizeof entry_nr))
2007 goto out;
2008 r = kvm_vm_ioctl_set_msix_nr(kvm, &entry_nr);
2009 if (r)
2010 goto out;
2011 break;
2012 }
2013 case KVM_ASSIGN_SET_MSIX_ENTRY: {
2014 struct kvm_assigned_msix_entry entry;
2015 r = -EFAULT;
2016 if (copy_from_user(&entry, argp, sizeof entry))
2017 goto out;
2018 r = kvm_vm_ioctl_set_msix_entry(kvm, &entry);
2019 if (r)
2020 goto out;
2021 break;
2022 }
1920#endif 2023#endif
2024#endif /* KVM_CAP_IRQ_ROUTING */
1921 default: 2025 default:
1922 r = kvm_arch_vm_ioctl(filp, ioctl, arg); 2026 r = kvm_arch_vm_ioctl(filp, ioctl, arg);
1923 } 2027 }