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riscv: virt: Allow PCI address 0

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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.cn@gmail.com>
Reviewed-by: Palmer Dabbelt <palmerdabbelt@google.com>
Signed-off-by: Palmer Dabbelt <palmerdabbelt@google.com>
This commit is contained in:
Bin Meng 2019-11-22 07:27:52 -08:00 committed by Palmer Dabbelt
parent c9eefe05a4
commit acead54c78
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hw/riscv/virt.c
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@ -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 = {