Re: [Qemu-devel] [PATCH v2 2/2] intel_iommu: allow migration

[Jason Wang <jasowang@redhat.com>]

On 2017年01月06日 11:08, Peter Xu wrote:
> IOMMU needs to be migrated before all the PCI devices (in case there are
> devices that will request for address translation). So marking it with a
> priority higher than the default (which PCI devices and other belong).
> Migration framework handled the rest.
>
> Signed-off-by: Peter Xu <peterx@redhat.com>
> ---
>   hw/i386/intel_iommu.c       | 21 ++++++++++++++++++++-
>   include/migration/vmstate.h |  1 +
>   2 files changed, 21 insertions(+), 1 deletion(-)
>
> diff --git a/hw/i386/intel_iommu.c b/hw/i386/intel_iommu.c
> index 5f3e351..ea9e526 100644
> --- a/hw/i386/intel_iommu.c
> +++ b/hw/i386/intel_iommu.c
> @@ -1996,7 +1996,26 @@ static void vtd_iommu_notify_flag_changed(MemoryRegion *iommu,
>   
>   static const VMStateDescription vtd_vmstate = {
>       .name = "iommu-intel",
> -    .unmigratable = 1,
> +    .version_id = 1,
> +    .minimum_version_id = 1,
> +    .priority = MIG_PRI_IOMMU,
> +    .fields = (VMStateField[]) {
> +        VMSTATE_UINT64(root, IntelIOMMUState),
> +        VMSTATE_UINT64(intr_root, IntelIOMMUState),
> +        VMSTATE_UINT64(iq, IntelIOMMUState),
> +        VMSTATE_UINT32(intr_size, IntelIOMMUState),
> +        VMSTATE_UINT16(iq_head, IntelIOMMUState),
> +        VMSTATE_UINT16(iq_tail, IntelIOMMUState),
> +        VMSTATE_UINT16(iq_size, IntelIOMMUState),
> +        VMSTATE_UINT16(next_frcd_reg, IntelIOMMUState),
> +        VMSTATE_UINT8(iq_last_desc_type, IntelIOMMUState),
> +        VMSTATE_BOOL(root_extended, IntelIOMMUState),
> +        VMSTATE_BOOL(dmar_enabled, IntelIOMMUState),
> +        VMSTATE_BOOL(qi_enabled, IntelIOMMUState),
> +        VMSTATE_BOOL(intr_enabled, IntelIOMMUState),
> +        VMSTATE_BOOL(intr_eime, IntelIOMMUState),
> +        VMSTATE_END_OF_LIST()
> +    }
>   };

Looks like register values were missed (e.g csr[]) ?

>   
>   static const MemoryRegionOps vtd_mem_ops = {
> diff --git a/include/migration/vmstate.h b/include/migration/vmstate.h
> index 1a22887..2125829 100644
> --- a/include/migration/vmstate.h
> +++ b/include/migration/vmstate.h
> @@ -188,6 +188,7 @@ enum VMStateFlags {
>   
>   typedef enum {
>       MIG_PRI_DEFAULT = 0,
> +    MIG_PRI_IOMMU,              /* Must happen before PCI devices */
>       MIG_PRI_MAX,
>   } MigrationPriority;
>