Re: [PATCH 1/2] vfio: Make vfio-pci available on 64-bit host platforms only

["Cédric Le Goater" <clg@redhat.com>]

On 2/26/25 15:12, BALATON Zoltan wrote:
> On Wed, 26 Feb 2025, Cédric Le Goater wrote:
>> VFIO PCI never worked on PPC32 nor ARM, S390x is 64-bit, it might have
>> worked on i386 long ago but we have no plans to further support VFIO
>> on any 32-bit host platforms. Restrict to 64-bit host platforms.
>>
>> Cc: Harsh Prateek Bora <harshpb@linux.ibm.com>
>> Cc: Tony Krowiak <akrowiak@linux.ibm.com>
>> Cc: Eric Farman <farman@linux.ibm.com>
>> Cc: Eric Auger <eric.auger@redhat.com>
>> Signed-off-by: Cédric Le Goater <clg@redhat.com>
>> ---
>> hw/vfio/Kconfig | 2 +-
>> 1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/hw/vfio/Kconfig b/hw/vfio/Kconfig
>> index 7cdba0560aa821c88d3420b36f86020575834202..6ed825429a9151fcdff33e95d1a310210689b258 100644
>> --- a/hw/vfio/Kconfig
>> +++ b/hw/vfio/Kconfig
>> @@ -7,7 +7,7 @@ config VFIO_PCI
>>     default y
>>     select VFIO
>>     select EDID
>> -    depends on LINUX && PCI
>> +    depends on LINUX && PCI && (AARCH64 || PPC64 || X86_64 || S390X)
> 
> Are these defined for the host or target? 

host.

> I see PPC is defined in target/ppc/Kconfig so I think these mark the target not the host. Vfio-pci works with qemu-system-ppc 

Ah ! I am surprised. Which host and QEMU machine please ?

> and we are trying to use it for GPU pass through for 32 bit PPC guests. Please keep that enabled.

As per commit 6d701c9bac1d3571e9ad511e01b27df7237f0b13 "meson: Deprecate
32-bit host support", support will be fully removed in 2 releases and
it doesn't need to be addressed by VFIO.


Thanks,

C.



> 
> Regards,
> BALATON Zoltan
> 
>> config VFIO_CCW
>>     bool
>>