[PATCH 3/3] qemu: Add support for virtio device option paeg-per-vq

[Jonathon Jongsma]

On Thu, Sep 9, 2021 at 6:51 AM Michal Prívozník <mprivozn at redhat.com> wrote:
>
> On 9/6/21 4:06 PM, Han Han wrote:
> > Resolves: https://bugzilla.redhat.com/show_bug.cgi?id=1925363
> >
> > Signed-off-by: Han Han <hhan at redhat.com>
> > ---
> >  src/qemu/qemu_command.c                       |  4 ++
> >  src/qemu/qemu_hotplug.c                       |  3 +-
> >  src/qemu/qemu_validate.c                      |  8 ++++
> >  .../virtio-options-controller-page_per_vq.err |  1 +
> >  ...-controller-page_per_vq.x86_64-latest.args | 37 ++++++++++++++++++
> >  .../virtio-options-controller-page_per_vq.xml | 38 ++++++++++++++++++
> >  .../virtio-options-disk-page_per_vq.err       |  1 +
> >  ...ptions-disk-page_per_vq.x86_64-latest.args | 39 +++++++++++++++++++
> >  .../virtio-options-disk-page_per_vq.xml       | 34 ++++++++++++++++
> >  .../virtio-options-fs-page_per_vq.err         |  1 +
> >  ...-options-fs-page_per_vq.x86_64-latest.args | 37 ++++++++++++++++++
> >  .../virtio-options-fs-page_per_vq.xml         | 34 ++++++++++++++++
> >  .../virtio-options-input-page_per_vq.err      |  1 +
> >  ...tions-input-page_per_vq.x86_64-latest.args | 35 +++++++++++++++++
> >  .../virtio-options-input-page_per_vq.xml      | 30 ++++++++++++++
> >  .../virtio-options-memballoon-page_per_vq.err |  1 +
> >  ...-memballoon-page_per_vq.x86_64-latest.args | 33 ++++++++++++++++
> >  .../virtio-options-memballoon-page_per_vq.xml | 23 +++++++++++
> >  .../virtio-options-net-page_per_vq.err        |  1 +
> >  ...options-net-page_per_vq.x86_64-latest.args | 37 ++++++++++++++++++
> >  .../virtio-options-net-page_per_vq.xml        | 34 ++++++++++++++++
> >  .../virtio-options-rng-page_per_vq.err        |  1 +
> >  ...options-rng-page_per_vq.x86_64-latest.args | 37 ++++++++++++++++++
> >  .../virtio-options-rng-page_per_vq.xml        | 32 +++++++++++++++
> >  .../virtio-options-video-page_per_vq.err      |  1 +
> >  ...tions-video-page_per_vq.x86_64-latest.args | 37 ++++++++++++++++++
> >  .../virtio-options-video-page_per_vq.xml      | 36 +++++++++++++++++
> >  .../virtio-options.x86_64-latest.args         | 26 ++++++-------
> >  tests/qemuxml2argvdata/virtio-options.xml     | 26 ++++++-------
> >  tests/qemuxml2argvtest.c                      | 22 +++++++++++
> >  30 files changed, 623 insertions(+), 27 deletions(-)
> >  create mode 100644 tests/qemuxml2argvdata/virtio-options-controller-page_per_vq.err
> >  create mode 100644 tests/qemuxml2argvdata/virtio-options-controller-page_per_vq.x86_64-latest.args
> >  create mode 100644 tests/qemuxml2argvdata/virtio-options-controller-page_per_vq.xml
> >  create mode 100644 tests/qemuxml2argvdata/virtio-options-disk-page_per_vq.err
> >  create mode 100644 tests/qemuxml2argvdata/virtio-options-disk-page_per_vq.x86_64-latest.args
> >  create mode 100644 tests/qemuxml2argvdata/virtio-options-disk-page_per_vq.xml
> >  create mode 100644 tests/qemuxml2argvdata/virtio-options-fs-page_per_vq.err
> >  create mode 100644 tests/qemuxml2argvdata/virtio-options-fs-page_per_vq.x86_64-latest.args
> >  create mode 100644 tests/qemuxml2argvdata/virtio-options-fs-page_per_vq.xml
> >  create mode 100644 tests/qemuxml2argvdata/virtio-options-input-page_per_vq.err
> >  create mode 100644 tests/qemuxml2argvdata/virtio-options-input-page_per_vq.x86_64-latest.args
> >  create mode 100644 tests/qemuxml2argvdata/virtio-options-input-page_per_vq.xml
> >  create mode 100644 tests/qemuxml2argvdata/virtio-options-memballoon-page_per_vq.err
> >  create mode 100644 tests/qemuxml2argvdata/virtio-options-memballoon-page_per_vq.x86_64-latest.args
> >  create mode 100644 tests/qemuxml2argvdata/virtio-options-memballoon-page_per_vq.xml
> >  create mode 100644 tests/qemuxml2argvdata/virtio-options-net-page_per_vq.err
> >  create mode 100644 tests/qemuxml2argvdata/virtio-options-net-page_per_vq.x86_64-latest.args
> >  create mode 100644 tests/qemuxml2argvdata/virtio-options-net-page_per_vq.xml
> >  create mode 100644 tests/qemuxml2argvdata/virtio-options-rng-page_per_vq.err
> >  create mode 100644 tests/qemuxml2argvdata/virtio-options-rng-page_per_vq.x86_64-latest.args
> >  create mode 100644 tests/qemuxml2argvdata/virtio-options-rng-page_per_vq.xml
> >  create mode 100644 tests/qemuxml2argvdata/virtio-options-video-page_per_vq.err
> >  create mode 100644 tests/qemuxml2argvdata/virtio-options-video-page_per_vq.x86_64-latest.args
> >  create mode 100644 tests/qemuxml2argvdata/virtio-options-video-page_per_vq.xml
>
> Wow, that's a lot of test cases. Do we need all of them?
>
> >
> > diff --git a/src/qemu/qemu_command.c b/src/qemu/qemu_command.c
> > index b230314f7f..549f11dbe8 100644
> > --- a/src/qemu/qemu_command.c
> > +++ b/src/qemu/qemu_command.c
> > @@ -645,6 +645,10 @@ qemuBuildVirtioOptionsStr(virBuffer *buf,
> >          virBufferAsprintf(buf, ",packed=%s",
> >                            virTristateSwitchTypeToString(virtio->packed));
> >      }
> > +    if (virtio->page_per_vq != VIR_TRISTATE_SWITCH_ABSENT) {
> > +        virBufferAsprintf(buf, ",page-per-vq=%s",
> > +                          virTristateSwitchTypeToString(virtio->page_per_vq));
> > +    }
> >  }
> >
> >  static int
> > diff --git a/src/qemu/qemu_hotplug.c b/src/qemu/qemu_hotplug.c
> > index 9c16ab4567..f2553a6831 100644
> > --- a/src/qemu/qemu_hotplug.c
> > +++ b/src/qemu/qemu_hotplug.c
> > @@ -3678,7 +3678,8 @@ qemuDomainChangeNet(virQEMUDriver *driver,
> >          (olddev->virtio && newdev->virtio &&
> >           (olddev->virtio->iommu != newdev->virtio->iommu ||
> >            olddev->virtio->ats != newdev->virtio->ats ||
> > -          olddev->virtio->packed != newdev->virtio->packed))) {
> > +          olddev->virtio->packed != newdev->virtio->packed ||
> > +          olddev->virtio->page_per_vq != newdev->virtio->page_per_vq))) {
> >          virReportError(VIR_ERR_OPERATION_UNSUPPORTED, "%s",
> >                         _("cannot modify virtio network device driver options"));
> >             goto cleanup;
> > diff --git a/src/qemu/qemu_validate.c b/src/qemu/qemu_validate.c
> > index 1a470f1ff5..93e8b55651 100644
> > --- a/src/qemu/qemu_validate.c
> > +++ b/src/qemu/qemu_validate.c
> > @@ -1478,6 +1478,14 @@ qemuValidateDomainVirtioOptions(const virDomainVirtioOptions *virtio,
> >                               "QEMU binary"));
> >              return -1;
> >          }
> > +
> > +    if (virtio->page_per_vq != VIR_TRISTATE_SWITCH_ABSENT &&
> > +        !virQEMUCapsGet(qemuCaps, QEMU_CAPS_VIRTIO_PAGE_PER_VQ)) {
> > +            virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
> > +                           _("the page_per_vq setting is not supported with this "
> > +                             "QEMU binary"));
>
> While we like lines to be 80 chars most we have an exception for error
> messages so that they can be easily 'git grep'-ped.
>
> I can fix this before pushing, but please let me know if we really need
> all the test cases. They seem to be very similar thus I'm in doubt.
>
> Michal
>

Also, please fix the typo in the commit message: "paeg" -> "page"

Jonathon