Bjoern Walk <bwalk@linux.ibm.com> [2020-10-15, 09:41PM +0200]:
Jonathon Jongsma <jjongsma@redhat.com> [2020-08-18, 09:47AM -0500]:
diff --git a/tests/nodedevmdevctldata/mdevctl-list-single.out.xml b/tests/nodedevmdevctldata/mdevctl-list-single.out.xml new file mode 100644 index 0000000000..cb443346ef --- /dev/null +++ b/tests/nodedevmdevctldata/mdevctl-list-single.out.xml @@ -0,0 +1,14 @@ +<device> + <name>mdev_783e6dbb_ea0e_411f_94e2_717eaad438bf</name> + <parent>matrix</parent> + <capability type='mdev'> + <type id='vfio_ap-passthrough'/> + <iommuGroup number='0'/> + <attr name='assign_adapter' value='5'/> + <attr name='assign_adapter' value='6'/> + <attr name='assign_domain' value='0xab'/> + <attr name='assign_control_domain' value='0xab'/> + <attr name='assign_domain' value='4'/> + <attr name='assign_control_domain' value='4'/> + </capability> +</device>
I find this XML design for the an AP mdev rather unfortunate. First of all, it is really noisy and requires a lot of boiler-plate for the end user.
Secondly, which I think it more important, it introduces a completely new and different nomenclature compared to what we currently already have for AP-related devices, i.e. cards
virsh # nodedev-dumpxml ap_card05 <device> <name>ap_card05</name> <path>/sys/devices/ap/card05</path> <parent>computer</parent> <driver> <name>cex4card</name> </driver> <capability type='ap_card'> <ap-adapter>0x05</ap-adapter> </capability> </device>
and queues
virsh # nodedev-dumpxml ap_05_002a <device> <name>ap_05_002a</name> <path>/sys/devices/ap/card05/05.002a</path> <parent>ap_card05</parent> <driver> <name>cex4queue</name> </driver> <capability type='ap_queue'> <ap-adapter>0x05</ap-adapter> <ap-domain>0x002a</ap-domain> </capability> </device>
I just figured that patches that implement that were not even sent upstream... We will do so shortly. I would however welcome a discussion on a sane and consistent XML design for both series.
This is really inconsistent and can be confusing for the end user.
Can we instead propose something along the lines
<device> <name>mdev_783e6dbb_ea0e_411f_94e2_717eaad438bf</name> <parent>matrix</parent> <capability type='mdev'> <type id='vfio_ap-passthrough'/> <iommuGroup number='0'/> <ap-adapter>0x05</ap-adapter> <ap-adapter>0x06</ap-adapter> <ap-domain>0x002a</ap-domain> <ap-domain>0x0004</ap-domain> <ap-domain>0x00ab</ap-domain> <ap-control>0x04</ap-control> </capability> </device>
plus any number of enclosing elements that we like for better readability?
Best, Bjoern
PS: I haven't read the whole patch series, we just have an internal discussion about AP support and the XML design came up. I know that we'd like to generically treat all mdevs as the same but we also should allow for vendor-specific attributes to be represented individually to what makes sense.
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