ioemu, passthrough: fix flag for expansion rom base address register.

pt_bar_reg_parse() is called for expansion rom base address register.
Currently it returns PT_BAR_FLAG_MEM if bit 0 is 0. It returns
PT_BAR_FLAG_IO if bit 0 is 1.

But bit 0 in expansion rom base address register is enable bit. If bit
0 is 1 for some reason, it returns PT_BAR_FLAG_IO. Expansion rom is
mapped to memory space. It should return PT_BAR_FLAG_MEM.

After applying this patch, it returns PT_BAR_FLAG_MEM regardless
of bit 0, when it is called for expansion rom base address register.

Signed-off-by: Yuji Shimada <shimada-yxb@necst.nec.co.jp>

1 files changed, 7 insertions, 0 deletions

diff --git a/tools/ioemu/hw/pass-through.c b/tools/ioemu/hw/pass-through.c
index 428845f2c9..ce24034de0 100644
--- a/tools/ioemu/hw/pass-through.c
+++ b/tools/ioemu/hw/pass-through.c
@@ -1528,6 +1528,13 @@ static int pt_bar_reg_parse(
     if (!r->size)
         goto out;
 
+    /* for ExpROM BAR */
+    if (index == PCI_ROM_SLOT)
+    {
+        bar_flag = PT_BAR_FLAG_MEM;
+        goto out;
+    }
+
     /* check BAR I/O indicator */
     if (d->config[reg->offset] & PCI_BASE_ADDRESS_SPACE_IO)
         bar_flag = PT_BAR_FLAG_IO;