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-rw-r--r--hw/pci-host/piix.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/hw/pci-host/piix.c b/hw/pci-host/piix.c
index 0e608347c1..da73743fa2 100644
--- a/hw/pci-host/piix.c
+++ b/hw/pci-host/piix.c
@@ -327,6 +327,10 @@ static void i440fx_pcihost_realize(DeviceState *dev, Error **errp)
sysbus_add_io(sbd, 0xcfc, &s->data_mem);
sysbus_init_ioports(sbd, 0xcfc, 4);
+
+ /* register i440fx 0xcf8 port as coalesced pio */
+ memory_region_set_flush_coalesced(&s->data_mem);
+ memory_region_add_coalescing(&s->conf_mem, 0, 4);
}
static void i440fx_realize(PCIDevice *dev, Error **errp)