From acead54c78c7294612f529413673eb4286fb8b18 Mon Sep 17 00:00:00 2001
From: Bin Meng <bmeng.cn@gmail.com>
Date: Fri, 22 Nov 2019 07:27:52 -0800
Subject: [PATCH] riscv: virt: Allow PCI address 0
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>
---
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 = {
--
2.30.2