[Qemu-devel] [PATCH] pci: fixes to allow booting from extra root pci buses.

[Marcel Apfelbaum <marcel@redhat.com>]

The PXB device exposes a new pci root bridge with the
fw path:  /pci-root@4/..., in which 4 is the root bus number.
Before this patch the fw path was wrongly computed:
    /pci-root@1/pci@i0cf8/...
Fix the above issues: Correct the bus number and remove the
extra host bridge description.

Signed-off-by: Marcel Apfelbaum <marcel@redhat.com>
---
Laszlo worked on supporting pxb for OVMF and discovered
that there is a problem when booting devices from a PXB.

This is a link to the latest QEMU series:
    https://www.mail-archive.com/qemu-devel@nongnu.org/msg302493.html

Thanks,
Marcel

 src/boot.c   | 1 -
 src/hw/pci.c | 2 +-
 2 files changed, 1 insertion(+), 2 deletions(-)

diff --git a/src/boot.c b/src/boot.c
index ec59c37..a3bb13b 100644
--- a/src/boot.c
+++ b/src/boot.c
@@ -114,7 +114,6 @@ build_pci_path(char *buf, int max, const char *devname, struct pci_device *pci)
     } else {
         if (pci->rootbus)
             p += snprintf(p, max, "/pci-root@%x", pci->rootbus);
-        p += snprintf(p, buf+max-p, "%s", FW_PCI_DOMAIN);
     }
 
     int dev = pci_bdf_to_dev(pci->bdf), fn = pci_bdf_to_fn(pci->bdf);
diff --git a/src/hw/pci.c b/src/hw/pci.c
index 0379b55..9e77af4 100644
--- a/src/hw/pci.c
+++ b/src/hw/pci.c
@@ -133,7 +133,7 @@ pci_probe_devices(void)
                 if (bus != lastbus)
                     rootbuses++;
                 lastbus = bus;
-                rootbus = rootbuses;
+                rootbus = bus;
                 if (bus > MaxPCIBus)
                     MaxPCIBus = bus;
             } else {
-- 
2.1.0