Re: [Qemu-devel] [PATCH] numa: fixup parsed NumaNodeOptions earlier

[Igor Mammedov <imammedo@redhat.com>]

On Thu, 12 Oct 2017 12:43:46 -0300
Eduardo Habkost <ehabkost@redhat.com> wrote:

> On Thu, Oct 12, 2017 at 11:39:58AM +0200, Igor Mammedov wrote:
> > numa 'mem' option with suffix or without one is possible
> > only on CLI/HMP. Instead of fixing up special suffix less
> > CLI case deep in parse_numa_node() do it earlier right
> > after option is parsed into NumaNodeOptions with OptVisistor
> > so that the rest of the code would use valid values in
> > NumaNodeOptions and won't have to reparse QemuOpts.
> > 
> > It will help to isolate CLI/HMP parts in parse_numa() and
> > split out parsed NumaNodeOptions processing into separate
> > function that could be reused by QMP handler where we have
> > only NumaNodeOptions and don't need any fixups.
> > 
> > While at it reuse qemu_strtosz_MiB() instead of manually
> > checking for suffixes.
> > 
> > Signed-off-by: Igor Mammedov <imammedo@redhat.com>
> > ---
> >  numa.c | 19 ++++++++++---------
> >  1 file changed, 10 insertions(+), 9 deletions(-)
> > 
> > diff --git a/numa.c b/numa.c
> > index 17ea514..fb4c35a 100644
> > --- a/numa.c
> > +++ b/numa.c
> > @@ -38,6 +38,7 @@
> >  #include "hw/mem/pc-dimm.h"
> >  #include "qemu/option.h"
> >  #include "qemu/config-file.h"
> > +#include "qemu/cutils.h"
> >  
> >  QemuOptsList qemu_numa_opts = {
> >      .name = "numa",
> > @@ -142,7 +143,7 @@ uint32_t numa_get_node(ram_addr_t addr, Error **errp)
> >  }
> >  
> >  static void parse_numa_node(MachineState *ms, NumaNodeOptions *node,
> > -                            QemuOpts *opts, Error **errp)
> > +                            Error **errp)
> >  {
> >      uint16_t nodenr;
> >      uint16List *cpus = NULL;
> > @@ -199,13 +200,7 @@ static void parse_numa_node(MachineState *ms, NumaNodeOptions *node,
> >      }
> >  
> >      if (node->has_mem) {
> > -        uint64_t mem_size = node->mem;
> > -        const char *mem_str = qemu_opt_get(opts, "mem");
> > -        /* Fix up legacy suffix-less format */
> > -        if (g_ascii_isdigit(mem_str[strlen(mem_str) - 1])) {
> > -            mem_size <<= 20;
> > -        }
> > -        numa_info[nodenr].node_mem = mem_size;
> > +        numa_info[nodenr].node_mem = node->mem;
> >      }
> >      if (node->has_memdev) {
> >          Object *o;
> > @@ -290,9 +285,15 @@ int parse_numa(void *opaque, QemuOpts *opts, Error **errp)
> >          goto end;
> >      }
> >  
> > +    /* Fix up legacy suffix-less format */
> > +    if ((object->type == NUMA_OPTIONS_TYPE_NODE) && object->u.node.has_mem) {
> > +        const char *mem_str = qemu_opt_get(opts, "mem");
> > +        qemu_strtosz_MiB(mem_str, NULL, &object->u.node.mem);
> > +    }
> > +  
> 
> I would like to have a way to represent this behavior in the QAPI
> schema somehow.  Markus, do you see a solution for that?
I've thought a bit about adding something like 'size_suffixed' type
but then it would sip into QMP/JSON where now size is just plain number
and we most likely wouldn't want this.

But it's not the only place that does this kind of fixup,
so maybe there could be some other way to this within OptsVisitor.

> But this patch is an improvement, anyway, so:
> 
> Reviewed-by: Eduardo Habkost <ehabkost@redhat.com>
> 
> 
> >      switch (object->type) {
> >      case NUMA_OPTIONS_TYPE_NODE:
> > -        parse_numa_node(ms, &object->u.node, opts, &err);
> > +        parse_numa_node(ms, &object->u.node, &err);
> >          if (err) {
> >              goto end;
> >          }
> > -- 
> > 2.7.4
> >   
>