Re: [Qemu-devel] [RFC PATCH 2/8] intel_iommu: name vtd address space with devfn

[Peter Xu <peterx@redhat.com>]

On Fri, Mar 25, 2016 at 10:13:23AM +0800, Jason Wang wrote:
> To avoid duplicated name and ease debugging.
> 
> Cc: Michael S. Tsirkin <mst@redhat.com>
> Cc: Paolo Bonzini <pbonzini@redhat.com>
> Cc: Richard Henderson <rth@twiddle.net>
> Cc: Eduardo Habkost <ehabkost@redhat.com>
> Signed-off-by: Jason Wang <jasowang@redhat.com>
> ---
>  hw/i386/intel_iommu.c | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/hw/i386/intel_iommu.c b/hw/i386/intel_iommu.c
> index 347718f..d647b42 100644
> --- a/hw/i386/intel_iommu.c
> +++ b/hw/i386/intel_iommu.c
> @@ -1901,6 +1901,7 @@ VTDAddressSpace *vtd_find_add_as(IntelIOMMUState *s, PCIBus *bus, int devfn)
>      uintptr_t key = (uintptr_t)bus;
>      VTDBus *vtd_bus = g_hash_table_lookup(s->vtd_as_by_busptr, &key);
>      VTDAddressSpace *vtd_dev_as;
> +    char name[128];
>  
>      if (!vtd_bus) {
>          /* No corresponding free() */
> @@ -1913,6 +1914,7 @@ VTDAddressSpace *vtd_find_add_as(IntelIOMMUState *s, PCIBus *bus, int devfn)
>      vtd_dev_as = vtd_bus->dev_as[devfn];
>  
>      if (!vtd_dev_as) {
> +        sprintf(name, "intel_iommu_devfn_%d", devfn);

It's safe here, but would snprintf() look better?

>          vtd_bus->dev_as[devfn] = vtd_dev_as = g_malloc0(sizeof(VTDAddressSpace));
>  
>          vtd_dev_as->bus = bus;
> @@ -1920,9 +1922,9 @@ VTDAddressSpace *vtd_find_add_as(IntelIOMMUState *s, PCIBus *bus, int devfn)
>          vtd_dev_as->iommu_state = s;
>          vtd_dev_as->context_cache_entry.context_cache_gen = 0;
>          memory_region_init_iommu(&vtd_dev_as->iommu, OBJECT(s),
> -                                 &s->iommu_ops, "intel_iommu", UINT64_MAX);
> +                                 &s->iommu_ops, name, UINT64_MAX);
>          address_space_init(&vtd_dev_as->as,
> -                           &vtd_dev_as->iommu, "intel_iommu");
> +                           &vtd_dev_as->iommu, name);
>      }
>      return vtd_dev_as;
>  }
> -- 
> 2.5.0
> 

Besides the nit-pick:

Acked-by: Peter Xu <peterx@redhat.com>