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Re: [libvirt] [PATCH 1/5] S390: Documentation for CCW address type



On 02/07/2013 04:02 PM, Daniel P. Berrange wrote:

Can you explaiin the semantics of the different components
in this device address ? WIth PCI addresses there are 4
colon-separated numbers a:b:c:d, which we explicitly
separate in the XML

   <address type="pci" domain="a" bus="b" device="c" function="d"/>

Unless there's a compelling reason not to, I think CCW
address XML ought to be similar, and use decimal notication
for each part, rather than hex, or at least require an
explicit 0x for hex. eg

   <address type="ccw" xxxx="254" yyyy="0" zzzz="1234" />
   <address type="ccw" xxxx="0xfe" yyyy="0" zzzz="1234" />

Daniel

Thanks for taking a look. To be true my initial version
was following the PCI example with individual attributes.
The s390 folks I've talked to didn't like it too much,
finding it unwieldy.

CCW addresses are much more visible (and relevant) to a Linux
admin on s390 than usually PCI addresses on other systems.
In fact on that platform they are more ubiquitous than
say IPv6 addresses which by power of convention are written
in a compact hex notation.

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