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hw/pci: inform bios if the system has extra pci root buses 

The bios looks for 'etc/extra-pci-roots' to decide if
is going to scan further buses after bus 0 tree.

Signed-off-by: Marcel Apfelbaum <marcel@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Laszlo Ersek <lersek@redhat.com>
This commit is contained in:
Marcel Apfelbaum 2015-06-02 14:23:07 +03:00 committed by Michael S. Tsirkin
parent 40d14bef80
commit 2118196bb3
1 changed files with 20 additions and 0 deletions
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20
hw/i386/pc.c
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@ -30,6 +30,7 @@
#include "hw/block/fdc.h"
#include "hw/ide.h"
#include "hw/pci/pci.h"
#include "hw/pci/pci_bus.h"
#include "monitor/monitor.h"
#include "hw/nvram/fw_cfg.h"
#include "hw/timer/hpet.h"
@ -1119,6 +1120,25 @@ void pc_guest_info_machine_done(Notifier *notifier, void *data)
PcGuestInfoState *guest_info_state = container_of(notifier,
PcGuestInfoState,
machine_done);
PCIBus *bus = find_i440fx();
if (bus) {
int extra_hosts = 0;
QLIST_FOREACH(bus, &bus->child, sibling) {
/* look for expander root buses */
if (pci_bus_is_root(bus)) {
extra_hosts++;
}
}
if (extra_hosts && guest_info_state->info.fw_cfg) {
uint64_t *val = g_malloc(sizeof(*val));
*val = cpu_to_le64(extra_hosts);
fw_cfg_add_file(guest_info_state->info.fw_cfg,
"etc/extra-pci-roots", val, sizeof(*val));
}
}
acpi_setup(&guest_info_state->info);
}