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

[Jason Wang <jasowang@redhat.com>]

On 03/28/2016 10:02 AM, Peter Xu wrote:
> 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?

Not sure, we're sure that name is large enough here.

>
>>          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>
>