Patchwork [15/21] pseries: Adjust default VIO address allocations to play better with libvirt

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Submitter Alexander Graf
Date Jan. 25, 2013, 12:52 p.m.
Message ID <>
Download mbox | patch
Permalink /patch/215764/
State New
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Alexander Graf - Jan. 25, 2013, 12:52 p.m.
From: David Gibson <>

Currently, if VIO devices for pseries don't have addresses explicitly
allocated, they get automatically numbered from 0x1000.  This is in the
same general range that libvirt will typically assign VIO device addresses.

That means that if there is a device libvirt doesn't know about, and it
gets an address assigned before the libvirt assigned devices are processed,
we can end up with an address conflict (qemu will abort with an error).

While the real solution is to teach libvirt about the other devices, so it
can correctly manage the whole allocation, this patch reduces the interim
inconvenience by moving qemu allocations to a range that libvirt is less
likely to conflict with.

Because the guest gets the device addresses through the device tree, these
addresses are truly arbitrary and can be changed without breaking guests.

Signed-off-by: David Gibson <>
Signed-off-by: Alexander Graf <>
 hw/spapr_vio.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)


diff --git a/hw/spapr_vio.c b/hw/spapr_vio.c
index 2054219..34c9ca6 100644
--- a/hw/spapr_vio.c
+++ b/hw/spapr_vio.c
@@ -492,7 +492,7 @@  VIOsPAPRBus *spapr_vio_bus_init(void)
     qbus = qbus_create(TYPE_SPAPR_VIO_BUS, dev, "spapr-vio");
     bus = DO_UPCAST(VIOsPAPRBus, bus, qbus);
-    bus->next_reg = 0x1000;
+    bus->next_reg = 0x71000000;
     /* hcall-vio */
     spapr_register_hypercall(H_VIO_SIGNAL, h_vio_signal);