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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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1
hw/ppc/spapr.c
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@ -1835,6 +1835,7 @@ static void spapr_machine_class_init(ObjectClass *oc, void *data)
mc->default_ram_size = 512 * M_BYTE;
mc->kvm_type = spapr_kvm_type;
mc->has_dynamic_sysbus = true;
mc->pci_allow_0_address = true;
fwc->get_dev_path = spapr_get_fw_dev_path;
nc->nmi_monitor_handler = spapr_nmi;