[PULL 36/38] riscv: virt: Allow PCI address 0

[Palmer Dabbelt]

From: Bin Meng <bmeng...@gmail.com>

When testing e1000 with the virt machine, e1000's I/O space cannot
be accessed. Debugging shows that the I/O BAR (BAR1) is correctly
written with address 0 plus I/O enable bit, but QEMU's "info pci"
shows that:

  Bus  0, device   1, function 0:
    Ethernet controller: PCI device 8086:100e
  ...
      BAR1: I/O at 0xffffffffffffffff [0x003e].
  ...

It turns out we should set pci_allow_0_address to true to allow 0
PCI address, otherwise pci_bar_address() treats such address as
PCI_BAR_UNMAPPED.

Signed-off-by: Bin Meng <bmeng...@gmail.com>
Reviewed-by: Palmer Dabbelt <palmerdabb...@google.com>
Signed-off-by: Palmer Dabbelt <palmerdabb...@google.com>
---
 hw/riscv/virt.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/hw/riscv/virt.c b/hw/riscv/virt.c
index 7f9e1e5176..5d175d5c9e 100644
--- a/hw/riscv/virt.c
+++ b/hw/riscv/virt.c
@@ -641,6 +641,7 @@ static void riscv_virt_machine_class_init(ObjectClass *oc, 
void *data)
     mc->init = riscv_virt_board_init;
     mc->max_cpus = 8;
     mc->default_cpu_type = VIRT_CPU;
+    mc->pci_allow_0_address = true;
 }
 
 static const TypeInfo riscv_virt_machine_typeinfo = {
-- 
2.25.0.265.gbab2e86ba0-goog