[libvirt] [PATCH 00/12] Drop KVM assignment

[Daniel Henrique Barboza]

On 8/21/19 9:53 AM, Ján Tomko wrote:
> On Tue, Aug 20, 2019 at 02:53:32PM -0300, Daniel Henrique Barboza wrote:
>>
>>
>> On 8/20/19 11:30 AM, Michal Privoznik wrote:
>>> The KVM style of PCI assignment is not used, and it hasn't been for a
>>> while. Any attempt to start a domain with it would result in error as
>>> kernel dropped its support in 4.12.0 (after being deprecated for 1.5
>>> years).
>>
>> LGTM. Just a comment in patch 01.
>>
>>
>> After applying the whole series I tried to find the remaining references
>> of 'pci-assign'. This is what git grep returns:
>>
>
> Yes, the 'kvm-pci-assign' device was present in those QEMU versions so
> it was listed in the replies.
>
>>
>> $ git grep 'pci-assign'
>> src/qemu/qemu_capabilities.h:    X_QEMU_CAPS_PCI_CONFIGFD, /* 
>> pci-assign.configfd */
>> src/qemu/qemu_capabilities.h:    X_QEMU_CAPS_PCI_BOOTINDEX, /* 
>> pci-assign.bootindex */
>> tests/qemucapabilitiesdata/caps_1.5.3.x86_64.replies: "name": 
>> "kvm-pci-assign"
>> tests/qemucapabilitiesdata/caps_1.6.0.x86_64.replies: "name": 
>> "kvm-pci-assign"
>> tests/qemucapabilitiesdata/caps_1.7.0.x86_64.replies: "name": 
>> "kvm-pci-assign"
>> tests/qemucapabilitiesdata/caps_2.1.1.x86_64.replies: "name": 
>> "kvm-pci-assign"
>> tests/qemucapabilitiesdata/caps_2.10.0.x86_64.replies: "name": 
>> "kvm-pci-assign",
>> tests/qemucapabilitiesdata/caps_2.4.0.x86_64.replies: "name": 
>> "kvm-pci-assign"
>> tests/qemucapabilitiesdata/caps_2.5.0.x86_64.replies: "name": 
>> "kvm-pci-assign"
>> tests/qemucapabilitiesdata/caps_2.6.0.x86_64.replies: "name": 
>> "kvm-pci-assign"
>> tests/qemucapabilitiesdata/caps_2.7.0.x86_64.replies: "name": 
>> "kvm-pci-assign"
>> tests/qemucapabilitiesdata/caps_2.8.0.x86_64.replies: "name": 
>> "kvm-pci-assign"
>> tests/qemucapabilitiesdata/caps_2.9.0.x86_64.replies: "name": 
>> "kvm-pci-assign"
>>
>>
>> And with 'configfd':
>>
>> $ git grep 'configfd'
>> docs/news-2011.html.in:      qemu: simplify PCI configfd handling in 
>> monitor (Eric Blake),<br/>
>> src/qemu/qemu_capabilities.c:              "pci-configfd",
>> src/qemu/qemu_capabilities.h:    X_QEMU_CAPS_PCI_CONFIGFD, /* 
>> pci-assign.configfd */
>> tests/qemustatusxml2xmldata/migration-in-params-in.xml: <flag 
>> name='pci-configfd'/>
>> tests/qemustatusxml2xmldata/migration-out-params-in.xml: <flag 
>> name='pci-configfd'/>
>>
>>
>>
>> Do we still need X_QEMU_CAPS_PCI_CONFIGFD and X_QEMU_CAPS_PCI_BOOTINDEX
>> after this series?
>>
>
> We need to be capable of parsing the qemu capability flags produced by
> older libvirt even though we aren't taking them into account.
>
> When upgrading libvirt while a domain is running, or migrating to a host
> with newer libvirt, rejecting the capability might break existing guests
> even though they did not use that particular capability.
>
> So we keep it around with an X- prefix and the corresponding string
> representation unchanged and just quietly ignore it.


Got it. Thanks for the explanation!


DHB

>
> Jano