Re: [Qemu-arm] [PATCH RFC 4/8] target-i386: cpu: consolidate calls of object_property_parse() in x86_cpu_parse_featurestr

[Peter Krempa]

On Thu, Jun 02, 2016 at 11:53:22 -0300, Eduardo Habkost wrote:
> (CCing libvirt folks)
> 
> BTW:
> 
> On Thu, Jun 02, 2016 at 02:22:22PM +0200, Igor Mammedov wrote:
> [...]
> > >         /* Special cases: */
> > >         if (!strcmp(name, "xlevel")) {
> > >             numvalue = strtoul(val, &err, 0);
> > >             if (!*val || *err) {
> > >                 error_setg(errp, "bad numerical value %s", val);
> > >                 return;
> > >             }
> > >             if (numvalue < 0x80000000) {
> > >                 error_report("xlevel value shall always be >= 0x80000000"
> > >                              ", fixup will be removed in future 
> > > versions");
> > >                 numvalue += 0x80000000;
> > >             snprintf(num, sizeof(num), "%" PRIu32, numvalue);
> > >             val = num;
> [...]
> > >         } else if (!strcmp(name, "hv-spinlocks")) {
> > >             const int min = 0xFFF;
> > > 
> > >             numvalue = strtoul(val, &err, 0);
> > >             if (!*val || *err) {
> > >                 error_setg(errp, "bad numerical value %s", val);
> > >                 return;
> > >             }
> > >             if (numvalue < min) {
> > >                 error_report("hv-spinlocks value shall always be >= 0x%x"
> > >                              ", fixup will be removed in future versions",
> > >                              min);
> > >                 numvalue = min;
> > >             }
> 
> Those "fixup will be removed in future versions" warnings are
> present since QEMU 1.7. Assuming that libvirt never allowed those
> invalid values to be used in the configuration (did it?), I
> believe we can safely remove the hv-spinlocks and xlevel fixups
> in QEMU 2.7.

I couldn't find anything regarding xlevel (so we might actually not
support it at all), but we indeed do limit the hv_spinlock count:


                if (def->hyperv_spinlocks < 0xFFF) {
                    virReportError(VIR_ERR_XML_ERROR, "%s",
                                   _("HyperV spinlock retry count must be "
                                     "at least 4095"));
                    goto error;
                }

Peter