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pci: allow 0 address for PCI IO/MEM regions

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Some kernels program a 0 address for io regions. PCI 3.0 spec
section 6.2.5.1 doesn't seem to disallow this.

based on patch by Michael Roth <mdroth@linux.vnet.ibm.com>

Add pci_allow_0_addr in MachineClass to conditionally
allow addr 0 for pseries, as this can break other architectures.

This patch allows to hotplug PCI card in pseries machine, as the first
added card BAR0 is always set to 0 address.

This as a temporary hack, waiting to fix PCI memory priorities for more
machine types...

Signed-off-by: Laurent Vivier <lvivier@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Laurent Vivier 2015-07-24 10:35:13 +02:00 • committed by Michael S. Tsirkin
parent c8d163bc9e
commit e402463073
3 changed files with 12 additions and 4 deletions
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3
include/hw/boards.h
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@ -100,7 +100,8 @@ struct MachineClass {
no_cdrom:1,
no_sdcard:1,
has_dynamic_sysbus:1,
no_tco:1;
no_tco:1,
pci_allow_0_address:1;
int is_default;
const char *default_machine_opts;
const char *default_boot_order;