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Re: [libvirt] [PATCH v8 00/14] PCI passthrough support on s390





在 2018/11/13 下午10:35, Andrea Bolognani 写道:
On Thu, 2018-11-08 at 19:00 +0800, Yi Min Zhao wrote:
Abstract
========
The PCI representation in QEMU has been extended for S390
allowing configuration of zPCI attributes like uid (user-defined
identifier) and fid (PCI function identifier).
The details can be found here:
https://lists.gnu.org/archive/html/qemu-devel/2016-06/msg07262.html

To support the new zPCI feature of the S390 platform, a new element of
PCI address is introduced. It has two optional attributes, @uid and
@fid. For example:
   <hostdev mode='subsystem' type='pci'>
     <driver name='vfio'/>
     <source>
       <address domain='0x0001' bus='0x00' slot='0x00' function='0x0'/>
     </source>
     <address type='pci' domain='0x0000' bus='0x00' slot='0x01' function='0x0'>
       <zpci uid='0x0003' fid='0x00000027'/>
     </address>
   </hostdev>

If they are defined by the user, unique values within the guest domain
must be used. If they are not specified and the architecture requires
them, they are automatically generated with non-conflicting values.

zPCI address as an extension of the PCI address are stored in a new
structure 'virZPCIDeviceAddress' which is a member of common PCI
Address structure. Additionally, two hashtables are used for assignment
and reservation of zPCI uid/fid.

In support of extending the PCI address, a new PCI address extension flag is
introduced. This extension flag allows is not only dedicated for the S390
platform but also other architectures needing certain extensions to PCI
address space.
I have now provided R-b for the only patch that was still missing it,
and as far as I'm concerned the series is ready to be pushed.
Thanks very much!

Dan, do you have any remaining concerns about the XML syntax, or can
I go ahead and push?


--
Yi Min


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