On Mon, Jun 27, 2016 at 11:49:46AM +0530, Bharata B Rao wrote: > Compat CPU type is typically specified on -cpu cmdline option like: > -cpu host,compat=power7 or -cpu POWER8E,compat=power7 etc. When > compat is specified on -cpu cmdline, apply the same to all the > CPUs that get created as part of CPU core devices. > > This patch takes care of compat property that is specified with > -cpu cmdline option only. The other way to specify this property > is via -global cmdline option and that usage isn't addressed by > this patch because -global is already broken for some CPU class > in PowerPC. There are two issues with using -global on CPU class. > > - We specify alias names for CPUs commonly and use of alias names > won't work with -global seamlessly. For eg, When "-cpu host" is > specified, the actual CPU type that gets created > is host-powerpc64-cpu. Hence specifying -global host.compat=power7 > will not work, so it has to be -global host-powerpc64-cpu.compat=power7. > > - PowerPC class names have . (dot) and opts parsing doesn't like it. > Specifying -global POWER8E_v2.1-powerpc64-cpu.compat=power7 will not > work as the driver name gets extracted as POWER8E_v2 and hence setting > of global property fails. > > The above two aspects could be considered/fixed separately from this > patch as this patch allows existing uses of -cpu cpuname,compat= to > work correctly after the introducton of sPAPR CPU cores. > > Signed-off-by: Bharata B Rao <bhar...@linux.vnet.ibm.com> > --- > Changes in v2: > - No need for a separate property named compat for cores. > - Simplified spapr_get_cpu_compat_type() based on David's review.
I'm still not seeing why this is actually necessary. If the compat property is specified with -global, it will automatically be propagated to all threads without core intervention, yes? So shouldn't we just make the -cpu fallback effectively set the same -global property, rather than bouncing it through the core object? > > v1: https://lists.gnu.org/archive/html/qemu-devel/2016-06/msg06279.html > > hw/ppc/spapr_cpu_core.c | 32 ++++++++++++++++++++++++++++++++ > 1 file changed, 32 insertions(+) > > diff --git a/hw/ppc/spapr_cpu_core.c b/hw/ppc/spapr_cpu_core.c > index 3a5da09..e8873fd 100644 > --- a/hw/ppc/spapr_cpu_core.c > +++ b/hw/ppc/spapr_cpu_core.c > @@ -96,6 +96,28 @@ char *spapr_get_cpu_core_type(const char *model) > return core_type; > } > > +/* > + * Returns the CPU compat type specified in -cpu @model. > + */ > +static char *spapr_get_cpu_compat_type(const char *model) > +{ > + char *model_str = g_strdup(model); > + char *featurestr, *compat = NULL; > + > + featurestr = model_str ? strtok(model_str, ",") : NULL; > + while (featurestr) { > + if (!strncmp(featurestr, "compat=", 7)) { > + compat = g_strdup(featurestr + 7); > + goto out; > + } > + featurestr = strtok(NULL, ","); > + } > + > +out: > + g_free(model_str); > + return compat; > +} > + > static void spapr_core_release(DeviceState *dev, void *opaque) > { > sPAPRCPUCore *sc = SPAPR_CPU_CORE(OBJECT(dev)); > @@ -285,6 +307,8 @@ static void spapr_cpu_core_realize(DeviceState *dev, > Error **errp) > CPUCore *cc = CPU_CORE(OBJECT(dev)); > const char *typename = object_class_get_name(sc->cpu_class); > size_t size = object_type_get_instance_size(typename); > + MachineState *machine = MACHINE(qdev_get_machine()); > + char *compat = spapr_get_cpu_compat_type(machine->cpu_model); > Error *local_err = NULL; > Object *obj; > int i; > @@ -300,11 +324,18 @@ static void spapr_cpu_core_realize(DeviceState *dev, > Error **errp) > if (local_err) { > goto err; > } > + if (compat) { > + object_property_set_str(obj, compat, "compat", &local_err); > + if (local_err) { > + goto err; > + } > + } > } > object_child_foreach(OBJECT(dev), spapr_cpu_core_realize_child, > &local_err); > if (local_err) { > goto err; > } else { > + g_free(compat); > return; > } > > @@ -315,6 +346,7 @@ err: > i--; > } > g_free(sc->threads); > + g_free(compat); > error_propagate(errp, local_err); > } > -- David Gibson | I'll have my music baroque, and my code david AT gibson.dropbear.id.au | minimalist, thank you. NOT _the_ _other_ | _way_ _around_! http://www.ozlabs.org/~dgibson
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