Re: [Qemu-devel] [PATCH RFC 10/17] hw/pci: removed 'rootbus nr is 0' assumption from qmp_pci_query

["Michael S. Tsirkin" <mst@redhat.com>]

On Fri, Jan 23, 2015 at 10:28:39AM +0200, Marcel Apfelbaum wrote:
> On 01/23/2015 09:57 AM, Michael S. Tsirkin wrote:
> >On Thu, Jan 22, 2015 at 09:52:36PM +0200, Marcel Apfelbaum wrote:
> >>From: Marcel Apfelbaum <marcel.a@redhat.com>
> >>
> >>Use the newer pci_bus_num to correctly get the root bus number.
> >>
> >>Signed-off-by: Marcel Apfelbaum <marcel@redhat.com>
> >
> >
> >OK for now, but really bus numbers are a wrong thing to
> >use for QMP. In particular they are often guest-assigned.
> Hi Michael,
> Thank you for the review.
> 
> This implementation requires user to input the bus number for host bridge's bus.
>     -pxb-device,bus_nr=<x>,...
> 
> Thank you,
> Marcel

That is fine since this device does not have a way for guest to set the
number, but later queries should always use names.

> >
> >>---
> >>  hw/pci/pci.c | 3 ++-
> >>  1 file changed, 2 insertions(+), 1 deletion(-)
> >>
> >>diff --git a/hw/pci/pci.c b/hw/pci/pci.c
> >>index dccb3d1..bf31168 100644
> >>--- a/hw/pci/pci.c
> >>+++ b/hw/pci/pci.c
> >>@@ -1251,7 +1251,8 @@ PciInfoList *qmp_query_pci(Error **errp)
> >>
> >>      QLIST_FOREACH(host_bridge, &pci_host_bridges, next) {
> >>          info = g_malloc0(sizeof(*info));
> >>-        info->value = qmp_query_pci_bus(host_bridge->bus, 0);
> >>+        info->value = qmp_query_pci_bus(host_bridge->bus,
> >>+                                        pci_bus_num(host_bridge->bus));
> >>
> >>          /* XXX: waiting for the qapi to support GSList */
> >>          if (!cur_item) {
> >>--
> >>2.1.0