On Fri, Nov 12, 2010 at 06:13:48PM +0800, Sheng Yang wrote:
> On Friday 12 November 2010 17:53:13 Michael S. Tsirkin wrote:
> > On Thu, Nov 11, 2010 at 03:46:59PM +0800, Sheng Yang wrote:
> > > This patch enable per-vector mask for assigned devices using MSI-X.
> > >
> > > This patch provided two new APIs: one is for guest to specific device's
> > > MSI-X table address in MMIO, the other is for userspace to get
> > > information about mask bit.
> > >
> > > All the mask bit operation are kept in kernel, in order to accelerate.
> > > Userspace shouldn't access the device MMIO directly for the information,
> > > instead it should uses provided API to do so.
> > >
> > > Signed-off-by: Sheng Yang <[email protected]>
> > > ---
> > >
> > > arch/x86/kvm/x86.c | 1 +
> > > include/linux/kvm.h | 32 +++++
> > > include/linux/kvm_host.h | 5 +
> > > virt/kvm/assigned-dev.c | 316
> > > +++++++++++++++++++++++++++++++++++++++++++++- 4 files changed,
> 353
> > > insertions(+), 1 deletions(-)
> > >
> > > diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
> > > index f3f86b2..847f1e1 100644
> > > --- a/arch/x86/kvm/x86.c
> > > +++ b/arch/x86/kvm/x86.c
> > > @@ -1926,6 +1926,7 @@ int kvm_dev_ioctl_check_extension(long ext)
> > >
> > > case KVM_CAP_DEBUGREGS:
> > > case KVM_CAP_X86_ROBUST_SINGLESTEP:
> > >
> > > case KVM_CAP_XSAVE:
> > > + case KVM_CAP_MSIX_MASK:
> > > r = 1;
> > > break;
> > >
> > > case KVM_CAP_COALESCED_MMIO:
> > > diff --git a/include/linux/kvm.h b/include/linux/kvm.h
> > > index 919ae53..32cd244 100644
> > > --- a/include/linux/kvm.h
> > > +++ b/include/linux/kvm.h
> > > @@ -540,6 +540,9 @@ struct kvm_ppc_pvinfo {
> > >
> > > #endif
> > > #define KVM_CAP_PPC_GET_PVINFO 57
> > > #define KVM_CAP_PPC_IRQ_LEVEL 58
> > >
> > > +#ifdef __KVM_HAVE_MSIX
> > > +#define KVM_CAP_MSIX_MASK 59
> > > +#endif
> > >
> > > #ifdef KVM_CAP_IRQ_ROUTING
> > >
> > > @@ -671,6 +674,9 @@ struct kvm_clock_data {
> > >
> > > #define KVM_XEN_HVM_CONFIG _IOW(KVMIO, 0x7a, struct
> > > kvm_xen_hvm_config) #define KVM_SET_CLOCK _IOW(KVMIO,
> > > 0x7b, struct kvm_clock_data) #define KVM_GET_CLOCK
> > > _IOR(KVMIO, 0x7c, struct kvm_clock_data)
> > >
> > > +/* Available with KVM_CAP_MSIX_MASK */
> > > +#define KVM_GET_MSIX_ENTRY _IOWR(KVMIO, 0x7d, struct
> > > kvm_msix_entry) +#define KVM_UPDATE_MSIX_MMIO _IOW(KVMIO, 0x7e,
> > > struct kvm_msix_mmio)
> > >
> > > /* Available with KVM_CAP_PIT_STATE2 */
> > > #define KVM_GET_PIT2 _IOR(KVMIO, 0x9f, struct
> > > kvm_pit_state2) #define KVM_SET_PIT2 _IOW(KVMIO, 0xa0,
> > > struct kvm_pit_state2)
> > >
> > > @@ -794,4 +800,30 @@ struct kvm_assigned_msix_entry {
> > >
> > > __u16 padding[3];
> > >
> > > };
> > >
> > > +#define KVM_MSIX_TYPE_ASSIGNED_DEV 1
> > > +
> > > +#define KVM_MSIX_FLAG_MASKBIT (1 << 0)
> > > +#define KVM_MSIX_FLAG_QUERY_MASKBIT (1 << 0)
> > > +
> > > +struct kvm_msix_entry {
> > > + __u32 id;
> > > + __u32 type;
> > > + __u32 entry; /* The index of entry in the MSI-X table */
> > > + __u32 flags;
> > > + __u32 query_flags;
> > > + __u32 reserved[5];
> > > +};
> > > +
> > > +#define KVM_MSIX_MMIO_FLAG_REGISTER (1 << 0)
> > > +#define KVM_MSIX_MMIO_FLAG_UNREGISTER (1 << 1)
> > > +
> > > +struct kvm_msix_mmio {
> > > + __u32 id;
> > > + __u32 type;
> > > + __u64 base_addr;
> > > + __u32 max_entries_nr;
> > > + __u32 flags;
> > > + __u32 reserved[6];
> > > +};
> > > +
> > >
> > > #endif /* __LINUX_KVM_H */
> > >
> > > diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
> > > index 4b31539..9d49074 100644
> > > --- a/include/linux/kvm_host.h
> > > +++ b/include/linux/kvm_host.h
> > > @@ -445,6 +445,7 @@ struct kvm_guest_msix_entry {
> > >
> > > };
> > >
> > > #define KVM_ASSIGNED_ENABLED_IOMMU (1 << 0)
> > >
> > > +#define KVM_ASSIGNED_ENABLED_MSIX_MMIO (1 << 1)
> > >
> > > struct kvm_assigned_dev_kernel {
> > >
> > > struct kvm_irq_ack_notifier ack_notifier;
> > > struct work_struct interrupt_work;
> > >
> > > @@ -465,6 +466,10 @@ struct kvm_assigned_dev_kernel {
> > >
> > > struct pci_dev *dev;
> > > struct kvm *kvm;
> > > spinlock_t assigned_dev_lock;
> > >
> > > + DECLARE_BITMAP(msix_mask_bitmap, KVM_MAX_MSIX_PER_DEV);
> > > + gpa_t msix_mmio_base;
> > > + struct kvm_io_device msix_mmio_dev;
> > > + int msix_max_entries_nr;
> > >
> > > };
> > >
> > > struct kvm_irq_mask_notifier {
> > >
> > > diff --git a/virt/kvm/assigned-dev.c b/virt/kvm/assigned-dev.c
> > > index 5c6b96d..3010d7d 100644
> > > --- a/virt/kvm/assigned-dev.c
> > > +++ b/virt/kvm/assigned-dev.c
> > > @@ -226,12 +226,27 @@ static void kvm_free_assigned_irq(struct kvm *kvm,
> > >
> > > kvm_deassign_irq(kvm, assigned_dev, assigned_dev->irq_requested_type);
> > >
> > > }
> > >
> > > +static void unregister_msix_mmio(struct kvm *kvm,
> > > + struct kvm_assigned_dev_kernel *adev)
> > > +{
> > > + if (adev->flags & KVM_ASSIGNED_ENABLED_MSIX_MMIO) {
> > > + mutex_lock(&kvm->slots_lock);
> > > + kvm_io_bus_unregister_dev(kvm, KVM_MMIO_BUS,
> > > + &adev->msix_mmio_dev);
> > > + mutex_unlock(&kvm->slots_lock);
> > > + adev->flags &= ~KVM_ASSIGNED_ENABLED_MSIX_MMIO;
> > > + }
> > > +}
> > > +
> > >
> > > static void kvm_free_assigned_device(struct kvm *kvm,
> > >
> > > struct kvm_assigned_dev_kernel
> > > *assigned_dev)
> > >
> > > {
> > >
> > > kvm_free_assigned_irq(kvm, assigned_dev);
> > >
> > > +#ifdef __KVM_HAVE_MSIX
> > > + unregister_msix_mmio(kvm, assigned_dev);
> > > +#endif
> > >
> > > pci_reset_function(assigned_dev->dev);
> > >
> > > pci_release_regions(assigned_dev->dev);
> > >
> > > @@ -504,7 +519,7 @@ out:
> > > static int kvm_vm_ioctl_assign_device(struct kvm *kvm,
> > >
> > > struct kvm_assigned_pci_dev *assigned_dev)
> > >
> > > {
> > >
> > > - int r = 0, idx;
> > > + int r = 0, idx, i;
> > >
> > > struct kvm_assigned_dev_kernel *match;
> > > struct pci_dev *dev;
> > >
> > > @@ -564,6 +579,10 @@ static int kvm_vm_ioctl_assign_device(struct kvm
> > > *kvm,
> > >
> > > list_add(&match->list, &kvm->arch.assigned_dev_head);
> > >
> > > + /* The state after reset of MSI-X table is all masked */
> > > + for (i = 0; i < KVM_MAX_MSIX_PER_DEV; i++)
> > > + set_bit(i, match->msix_mask_bitmap);
> > > +
> > >
> > > if (assigned_dev->flags & KVM_ASSIGNED_ENABLED_IOMMU) {
> > >
> > > if (!kvm->arch.iommu_domain) {
> > >
> > > r = kvm_iommu_map_guest(kvm);
> > >
> > > @@ -667,6 +686,43 @@ msix_nr_out:
> > > return r;
> > >
> > > }
> > >
> > > +static void update_msix_mask(struct kvm_assigned_dev_kernel *adev,
> > > + int idx, bool new_mask_flag)
> > > +{
> > > + int irq;
> > > + bool old_mask_flag, need_flush = false;
> > > +
> > > + spin_lock_irq(&adev->assigned_dev_lock);
> > > +
> > > + if (!adev->dev->msix_enabled ||
> > > + !(adev->irq_requested_type & KVM_DEV_IRQ_HOST_MSIX))
> > > + goto out;
> > > +
> > > + old_mask_flag = test_bit(adev->guest_msix_entries[idx].entry,
> > > + adev->msix_mask_bitmap);
> > > + if (old_mask_flag == new_mask_flag)
> > > + goto out;
> > > +
> > > + irq = adev->host_msix_entries[idx].vector;
> > > + BUG_ON(irq == 0);
> > > +
> > > + if (new_mask_flag) {
> > > + set_bit(adev->guest_msix_entries[idx].entry,
> > > + adev->msix_mask_bitmap);
> > > + disable_irq_nosync(irq);
> > > + need_flush = true;
> > > + } else {
> > > + clear_bit(adev->guest_msix_entries[idx].entry,
> > > + adev->msix_mask_bitmap);
> > > + enable_irq(irq);
> > > + }
> > > +out:
> > > + spin_unlock_irq(&adev->assigned_dev_lock);
> > > +
> > > + if (need_flush)
> > > + flush_work(&adev->interrupt_work);
> > > +}
> > > +
> > >
> > > static int kvm_vm_ioctl_set_msix_entry(struct kvm *kvm,
> > >
> > > struct kvm_assigned_msix_entry *entry)
> > >
> > > {
> > >
> > > @@ -701,6 +757,233 @@ msix_entry_out:
> > > return r;
> > >
> > > }
> > >
> > > +
> > > +static int kvm_vm_ioctl_get_msix_entry(struct kvm *kvm,
> > > + struct kvm_msix_entry *entry)
> > > +{
> > > + int r = 0;
> > > + struct kvm_assigned_dev_kernel *adev;
> > > +
> > > + if (entry->type != KVM_MSIX_TYPE_ASSIGNED_DEV)
> > > + return -EINVAL;
> > > +
> > > + if (!entry->query_flags)
> > > + return -EINVAL;
> > > +
> > > + mutex_lock(&kvm->lock);
> > > +
> > > + adev = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
> > > + entry->id);
> > > +
> > > + if (!adev) {
> > > + r = -EINVAL;
> > > + goto out;
> > > + }
> > > +
> > > + if (entry->entry >= adev->msix_max_entries_nr) {
> > > + r = -ENOSPC;
> > > + goto out;
> > > + }
> > > +
> > > + if (entry->query_flags & KVM_MSIX_FLAG_QUERY_MASKBIT) {
> > > + if (test_bit(entry->entry, adev->msix_mask_bitmap))
> > > + entry->flags |= KVM_MSIX_FLAG_MASKBIT;
> > > + else
> > > + entry->flags &= ~KVM_MSIX_FLAG_MASKBIT;
> > > + }
> > > +
> > > +out:
> > > + mutex_unlock(&kvm->lock);
> > > +
> > > + return r;
> > > +}
> > > +
> > > +static bool msix_mmio_in_range(struct kvm_assigned_dev_kernel *adev,
> > > + gpa_t addr, int len)
> > > +{
> > > + gpa_t start, end;
> > > +
> > > + BUG_ON(adev->msix_mmio_base == 0);
> >
> > I thought we wanted to use a separate flag for this?
>
> O, flag added, but forgot to update this one.
> >
> > > + start = adev->msix_mmio_base;
> > > + end = adev->msix_mmio_base + PCI_MSIX_ENTRY_SIZE *
> > > + adev->msix_max_entries_nr;
> > > + if (addr >= start && addr + len <= end)
> > > + return true;
> > > +
> > > + return false;
> > > +}
> > > +
> > > +static int msix_get_enabled_idx(struct kvm_assigned_dev_kernel *adev,
> > > + gpa_t addr, int len)
> > > +{
> > > + int i, index = (addr - adev->msix_mmio_base) / PCI_MSIX_ENTRY_SIZE;
> > > +
> > > + for (i = 0; i < adev->entries_nr; i++)
> > > + if (adev->guest_msix_entries[i].entry == index)
> > > + return i;
> > > +
> > > + return -EINVAL;
> > > +}
> > > +
> >
> > Hmm, we still have a linear scan on each write. Is the point to detect
> > which entries need to be handled in kernel? Maybe another bitmap for
> > this? Or just handle whole entry write in kernel as well, then we won't
> > need this at all.
>
> Still dont' like handling the whole entry writing. In fact here we have two
> questions:
> 1. If the entry already enabled
> 2. If it is, then what's it sequence number.
>
> Bitmap can solve question 1, but we still need O(n) scan for the second. So I
> think leave it like this should be fine.
The spec quoted above implies we must handle all entry writes:
a single write can update mask and data.
> > > +static int msix_mmio_read(struct kvm_io_device *this, gpa_t addr, int
> > > len, + void *val)
> > > +{
> > > + struct kvm_assigned_dev_kernel *adev =
> > > + container_of(this, struct kvm_assigned_dev_kernel,
> > > + msix_mmio_dev);
> > > + int idx, r = 0;
> > > + u32 entry[4];
> > > + struct kvm_kernel_irq_routing_entry e;
> > > +
> > > + mutex_lock(&adev->kvm->lock);
> > > + if (!msix_mmio_in_range(adev, addr, len)) {
> > > + r = -EOPNOTSUPP;
> > > + goto out;
> > > + }
> > > + if ((addr & 0x3) || len != 4)
> > > + goto out;
> > > +
> > > + idx = msix_get_enabled_idx(adev, addr, len);
> > > + if (idx < 0) {
> > > + idx = (addr - adev->msix_mmio_base) / PCI_MSIX_ENTRY_SIZE;
> > > + if ((addr % PCI_MSIX_ENTRY_SIZE) ==
> > > + PCI_MSIX_ENTRY_VECTOR_CTRL)
> > > + *(unsigned long *)val =
> > > + test_bit(idx, adev->msix_mask_bitmap) ?
> > > + PCI_MSIX_ENTRY_CTRL_MASKBIT : 0;
> > > + else
> > > + r = -EOPNOTSUPP;
> > > + goto out;
> > > + }
> > > +
> > > + r = kvm_get_irq_routing_entry(adev->kvm,
> > > + adev->guest_msix_entries[idx].vector, &e);
> > > + if (r || e.type != KVM_IRQ_ROUTING_MSI) {
> > > + r = -EOPNOTSUPP;
> > > + goto out;
> > > + }
> > > + entry[0] = e.msi.address_lo;
> > > + entry[1] = e.msi.address_hi;
> > > + entry[2] = e.msi.data;
> > > + entry[3] = test_bit(adev->guest_msix_entries[idx].entry,
> > > + adev->msix_mask_bitmap);
> > > + memcpy(val, &entry[addr % PCI_MSIX_ENTRY_SIZE / sizeof *entry], len);
> >
> > It seems weird to pass writes to userspace but do reads
> > in kernel.
> > Either we should support entry read and write or neither.
>
> Entry read is for speed up, because kernel would write to the mask bit then
> try to
> read from it for flushing. Don't think reading matter much here, as long as
> userspace still own routing table.
>
> > > +
> > > +out:
> > > + mutex_unlock(&adev->kvm->lock);
> > > + return r;
> > > +}
> > > +
> > > +static int msix_mmio_write(struct kvm_io_device *this, gpa_t addr, int
> > > len, + const void *val)
> > > +{
> > >
> > > + struct kvm_assigned_dev_kernel *adev =
> > > + container_of(this, struct kvm_assigned_dev_kernel,
> > > + msix_mmio_dev);
> > > + int idx, r = 0;
> > > + unsigned long new_val = *(unsigned long *)val;
> >
> > Move this to after you did length and alignment checks,
> > it might not be safe here.
> >
> > > +
> > > + mutex_lock(&adev->kvm->lock);
> > > + if (!msix_mmio_in_range(adev, addr, len)) {
> > > + r = -EOPNOTSUPP;
> > > + goto out;
> > > + }
> > > + if ((addr & 0x3) || len != 4)
> >
> > The lenght could be 8:
> >
> > For all accesses to MSI-X Table and MSI-X PBA fields, software must use
> > aligned full DWORD or aligned full QWORD transactions; otherwise, the
> > result is undefined.
> >
> > and
> >
> > Software is permitted to fill in MSI-X Table entry DWORD fields
> > individually with DWORD writes, or software in certain cases is permitted
> > to fill in appropriate pairs of DWORDs with a single QWORD write.
> > Specifically, software is always permitted to fill in the Message Address
> > and Message Upper Address fields with a single QWORD write. If a given
> > entry is currently masked (via its Mask bit or the Function Mask bit),
> > software is permitted to fill in the Message Data and Vector Control
> > fields with a single QWORD write, taking advantage of the fact the Message
> > Data field is guaranteed to become visible to hardware no later than the
> > Vector Control field. However, if software wishes to mask a currently
> > unmasked entry (without setting the Function Mask bit), software must set
> > the entry’s Mask bit using a DWORD write to the Vector Control field,
> > since performing a QWORD write to the Message Data and Vector Control
> > fields might result in the Message Data field being modified before the
> > Mask bit in the Vector Control field becomes set.
>
> Haven't seen any device use QWORD accessing. Also QEmu can't handle QWORD
> MMIO as
> well. So I guess we can leave it later.
>
> > > + goto out;
> >
> > Why don't we pass to userspace on error?
> > Will make it easy to debug ...
>
> OK, at least we can know if guest want to access it using 8 bits.
> >
> > > +
> > > + idx = msix_get_enabled_idx(adev, addr, len);
> > > + if (idx < 0) {
> > > + idx = (addr - adev->msix_mmio_base) / PCI_MSIX_ENTRY_SIZE;
> > > + if (((addr % PCI_MSIX_ENTRY_SIZE) ==
> > > + PCI_MSIX_ENTRY_VECTOR_CTRL)) {
> > > + if (new_val & ~PCI_MSIX_ENTRY_CTRL_MASKBIT)
> > > + goto out;
> > > + if (new_val & PCI_MSIX_ENTRY_CTRL_MASKBIT)
> > > + set_bit(idx, adev->msix_mask_bitmap);
> > > + else
> > > + clear_bit(idx, adev->msix_mask_bitmap);
> > > + /* It's possible that we need re-enable MSI-X, so go
> > > + * back to userspace */
> > > + }
> > > + /* Userspace would handle other MMIO writing */
> > > + r = -EOPNOTSUPP;
> > > + goto out;
> > > + }
> > > + if (addr % PCI_MSIX_ENTRY_SIZE != PCI_MSIX_ENTRY_VECTOR_CTRL) {
> > > + r = -EOPNOTSUPP;
> > > + goto out;
> > > + }
> > > + if (new_val & ~PCI_MSIX_ENTRY_CTRL_MASKBIT)
> > > + goto out;
> >
> > So if the write touches any other bit, we ignore mask bit write
> > completely? Don't even pass to userspace? why?
>
> Because other bits are reserved. The writing behavior is illegal. Spec said
> result
> is undefined.
>
> --
> regards
> Yang, Sheng
>
> >
> > > + update_msix_mask(adev, idx, !!(new_val & PCI_MSIX_ENTRY_CTRL_MASKBIT));
> > > +out:
> > > + mutex_unlock(&adev->kvm->lock);
> > > +
> > > + return r;
> > > +}
> > > +
> > > +static const struct kvm_io_device_ops msix_mmio_ops = {
> > > + .read = msix_mmio_read,
> > > + .write = msix_mmio_write,
> > > +};
> > > +
> > > +static int kvm_vm_ioctl_update_msix_mmio(struct kvm *kvm,
> > > + struct kvm_msix_mmio *msix_mmio)
> > > +{
> > > + int r = 0;
> > > + struct kvm_assigned_dev_kernel *adev;
> > > +
> > > + if (msix_mmio->type != KVM_MSIX_TYPE_ASSIGNED_DEV)
> > > + return -EINVAL;
> > > +
> > > + if (!msix_mmio->flags)
> > > + return -EINVAL;
> > > +
> > > + mutex_lock(&kvm->lock);
> > > + adev = kvm_find_assigned_dev(&kvm->arch.assigned_dev_head,
> > > + msix_mmio->id);
> > > + if (!adev) {
> > > + r = -EINVAL;
> > > + goto out;
> > > + }
> > > + if (msix_mmio->base_addr == 0) {
> > > + r = -EINVAL;
> > > + goto out;
> > > + }
> > > + if (msix_mmio->max_entries_nr == 0 ||
> > > + msix_mmio->max_entries_nr > KVM_MAX_MSIX_PER_DEV) {
> > > + r = -EINVAL;
> > > + goto out;
> > > + }
> > > +
> > > + if ((msix_mmio->flags & KVM_MSIX_MMIO_FLAG_REGISTER) &&
> > > + (msix_mmio->flags & KVM_MSIX_MMIO_FLAG_UNREGISTER)) {
> > > + r = -EINVAL;
> > > + goto out;
> > > + }
> > > +
> > > + if (msix_mmio->flags & KVM_MSIX_MMIO_FLAG_REGISTER) {
> > > + if (!(adev->flags & KVM_ASSIGNED_ENABLED_MSIX_MMIO)) {
> > > + mutex_lock(&kvm->slots_lock);
> > > + kvm_iodevice_init(&adev->msix_mmio_dev,
> > > + &msix_mmio_ops);
> > > + r = kvm_io_bus_register_dev(kvm, KVM_MMIO_BUS,
> > > + &adev->msix_mmio_dev);
> > > + if (!r)
> > > + adev->flags |= KVM_ASSIGNED_ENABLED_MSIX_MMIO;
> > > + mutex_unlock(&kvm->slots_lock);
> > > + }
> > > + if (!r) {
> > > + adev->msix_mmio_base = msix_mmio->base_addr;
> > > + adev->msix_max_entries_nr = msix_mmio->max_entries_nr;
> > > + }
> > > + } else if (msix_mmio->flags & KVM_MSIX_MMIO_FLAG_UNREGISTER)
> > > + unregister_msix_mmio(kvm, adev);
> > > +out:
> > > + mutex_unlock(&kvm->lock);
> > > +
> > > + return r;
> > > +}
> > >
> > > #endif
> > >
> > > long kvm_vm_ioctl_assigned_device(struct kvm *kvm, unsigned ioctl,
> > >
> > > @@ -813,6 +1096,37 @@ long kvm_vm_ioctl_assigned_device(struct kvm *kvm,
> > > unsigned ioctl,
> > >
> > > goto out;
> > >
> > > break;
> > >
> > > }
> > >
> > > + case KVM_GET_MSIX_ENTRY: {
> > > + struct kvm_msix_entry entry;
> > > + r = -EFAULT;
> > > + if (copy_from_user(&entry, argp, sizeof entry))
> > > + goto out;
> > > + r = kvm_vm_ioctl_get_msix_entry(kvm, &entry);
> > > + if (r)
> > > + goto out;
> > > + r = -EFAULT;
> > > + if (copy_to_user(argp, &entry, sizeof entry))
> > > + goto out;
> > > + r = 0;
> > > + break;
> > > + }
> > > + case KVM_UPDATE_MSIX_MMIO: {
> > > + struct kvm_msix_mmio msix_mmio;
> > > +
> > > + r = -EFAULT;
> > > + if (copy_from_user(&msix_mmio, argp, sizeof(msix_mmio)))
> > > + goto out;
> > > +
> > > + r = -EINVAL;
> > > + if (find_first_bit((unsigned long *)msix_mmio.reserved,
> > > + sizeof(msix_mmio.reserved)) < sizeof(msix_mmio.reserved))
> > > + goto out;
> > > +
> > > + r = kvm_vm_ioctl_update_msix_mmio(kvm, &msix_mmio);
> > > + if (r)
> > > + goto out;
> > > + break;
> > > + }
> > >
> > > #endif
> > >
> > > }
> > >
> > > out:
--
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