Re: [PATCH] device-dax: map dax memory as decrypted in CoCo guests

[Gupta, Pankaj]

On 8/26/2024 11:35 PM, Kevin Loughlin wrote:
> > How can I test this? Can I test it with virtio-pmem device?
>
> Correct. Assuming the CoCo guest accesses some virtio-pmem device in
> devdax mode, mmapping() this virtio-pmem device's memory region
> results in the guest and host reading the same (plaintext) values from
> the region.

I tried to test the daxdev with virtio-pmem but getting the below error 
(just tried without this patch)

root@ubuntu:/home/amd# ndctl list -N
{
  "dev":"namespace0.0",
  "mode":"devdax",
  "map":"dev",
  "size":1054867456,
  "uuid":"c8b15ce6-0c8f-4a1a-ada6-b19a90bdf1bb",
  "numa_node":0
}

root@ubuntu:cat /dev/zero | daxio --output=/dev/namespace0.0
daxio: neither input or output is device dax

Could you please share the instructions (to test with virtio-pmem or 
Qemu). If not, still okay.

Thanks,
Pankaj
Best regards,
Pankaj