Re: [Qemu-devel] [PATCH 1/7] virtio-pmem: add virtio device

[Eric Blake]

On 5/23/19 5:24 AM, Pankaj Gupta wrote:
> This is the implementation of virtio-pmem device. Support will require
> machine changes for the architectures that will support it, so it will
> not yet be compiled. It can be unlocked with VIRTIO_PMEM_SUPPORTED per
> machine and disabled globally via VIRTIO_PMEM.
> 
> We cannot use the "addr" property as that is already used e.g. for
> virtio-pci/pci devices. And we will have e.g. virtio-pmem-pci as a proxy.
> So we have to choose a different one (unfortunately). "memaddr" it is.
> That name should ideally be used by all other virtio-* based memory
> devices in the future.
>     -device virtio-pmem-pci,id=p0,bus=bux0,addr=0x01,memaddr=0x1000000...
> 
> Acked-by: Markus Armbruster <address@hidden>
> [ QAPI bits ]
> Signed-off-by: Pankaj Gupta <address@hidden>
> [ MemoryDevice/MemoryRegion changes, cleanups, addr property "memaddr",
>   split up patches, unplug handler ]
> Signed-off-by: David Hildenbrand <address@hidden>
> ---

> +++ b/qapi/misc.json
> @@ -2742,16 +2742,42 @@
>            }
>  }
>  
> +##
> +# @VirtioPMEMDeviceInfo:
> +#
> +# VirtioPMEM state information
> +#
> +# @id: device's ID
> +#
> +# @memaddr: physical address in memory, where device is mapped
> +#
> +# @size: size of memory that the device provides
> +#
> +# @memdev: memory backend linked with device
> +#
> +# Since: 4.0

You've missed 4.0; this should be 4.1.

> +##
> +{ 'struct': 'VirtioPMEMDeviceInfo',
> +  'data': { '*id': 'str',

Why is id optional? Does it make sense to have a device without an id?

> +            'memaddr': 'size',
> +            'size': 'size',
> +            'memdev': 'str'
> +          }
> +}
> +
>  ##
>  # @MemoryDeviceInfo:
>  #
>  # Union containing information about a memory device
>  #
> +# nvdimm is included since 2.12. virtio-pmem is included since 4.0.

4.1

> +#
>  # Since: 2.1
>  ##
>  { 'union': 'MemoryDeviceInfo',
>    'data': { 'dimm': 'PCDIMMDeviceInfo',
> -            'nvdimm': 'PCDIMMDeviceInfo'
> +            'nvdimm': 'PCDIMMDeviceInfo',
> +            'virtio-pmem': 'VirtioPMEMDeviceInfo'
>            }
>  }
>  
> 

-- 
Eric Blake, Principal Software Engineer
Red Hat, Inc.           +1-919-301-3226
Virtualization:  qemu.org | libvirt.org

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