Re: [libvirt PATCH 1/5] conf: define a new "maximum" CPU mode

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On Tue, Feb 09, 2021 at 03:30:47PM +0100, Pavel Hrdina wrote:
> On Tue, Feb 09, 2021 at 01:58:57PM +0000, Daniel P. Berrangé wrote:
> > For hardware virtualization this is functionally identical to the
> > existing host-passthrough mode so the same caveats apply.
> > 
> > For emulated guest this exposes the maximum featureset supported by
> > the emulator. Note that despite being emulated this is not guaranteed
> > to be migration safe, especially if different emulator software versions
> > are used on each host.
> > 
> > Signed-off-by: Daniel P. Berrangé <berrange@xxxxxxxxxx>
> > ---
> >  docs/formatdomain.rst        | 24 ++++++++++++++++++++++++
> >  src/conf/cpu_conf.c          | 13 +++++++++----
> >  src/conf/cpu_conf.h          |  1 +
> >  src/cpu/cpu.c                |  1 +
> >  src/qemu/qemu_capabilities.c |  1 +
> >  src/qemu/qemu_command.c      |  1 +
> >  src/qemu/qemu_domain.c       |  1 +
> >  src/qemu/qemu_validate.c     |  1 +
> >  8 files changed, 39 insertions(+), 4 deletions(-)
> 
> [...]
> 
> > diff --git a/src/conf/cpu_conf.c b/src/conf/cpu_conf.c
> > index f98b0a0eb3..eb4bfbbcfa 100644
> > --- a/src/conf/cpu_conf.c
> > +++ b/src/conf/cpu_conf.c
> > @@ -402,10 +403,11 @@ virCPUDefParseXML(xmlXPathContextPtr ctxt,
> >      if ((migratable = virXMLPropString(ctxt->node, "migratable"))) {
> >          int val;
> >  
> > -        if (def->mode != VIR_CPU_MODE_HOST_PASSTHROUGH) {
> > +        if (def->mode != VIR_CPU_MODE_HOST_PASSTHROUGH &&
> > +            def->mode != VIR_CPU_MODE_MAXIMUM) {
> >              virReportError(VIR_ERR_CONFIG_UNSUPPORTED, "%s",
> >                             _("Attribute migratable is only allowed for "
> > -                             "host-passthrough CPU"));
> > +                             "'host-passthrough' / 'maximum' CPU mode"));
> 
> Since you are modifying the error message I would reformat it to single
> line.

That'd would make the line waaaaay longer than normal practice. I know
we don't need to strictly stick to 80 chars, but at the same time we
don't want things massively long.

> Reviewed-by: Pavel Hrdina <phrdina@xxxxxxxxxx>



Regards,
Daniel
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