Writing the base address directly to the ROM BAR may cause problem
since the kernel is not aware of the operation.
Signed-off-by: Yu Zhao <yu.zhao@xxxxxxxxx>
---
 hw/pass-through.c | 25 +++++++++++++++++++++++--
 1 files changed, 23 insertions(+), 2 deletions(-)
diff --git a/hw/pass-through.c b/hw/pass-through.c
index 207bdf0..e76a3c3 100644
--- a/hw/pass-through.c
+++ b/hw/pass-through.c
@@ -1447,6 +1447,27 @@ exit:
 return val;
 }
 
+static int pt_pci_enable_rom(struct pci_dev *dev)
+{
+ FILE *fp;
+ char path[PATH_MAX];
+
+ sprintf(path, "/sys/bus/pci/devices/%04x:%02x:%02x.%x/rom",
+ dev->domain, dev->bus, dev->dev, dev->func);
+
+ fp = fopen(path, "w");
+ if ( !fp )
+ {
+ PT_LOG("Can't open %s: %s\n", path, strerror(errno));
+ return -1;
+ }
+
+ fprintf(fp, "1");
+ fclose(fp);
+
+ return 0;
+}
+
 static void pt_libpci_fixup(struct pci_dev *dev)
 {
 #if PCI_LIB_VERSION < 0x030100
@@ -1526,8 +1547,8 @@ static int pt_register_regions(struct pt_dev 
*assigned_device)
 
 /* Re-set BAR reported by OS, otherwise ROM can't be read. */
 if ( (pci_dev->rom_base_addr & PCI_ROM_ADDRESS_MASK) == 0 )
- pci_write_long(pci_dev, PCI_ROM_ADDRESS,
- (pci_dev->rom_base_addr | PCI_ROM_ADDRESS_MASK));
+ if ( pt_pci_enable_rom(pci_dev) )
+ return -1;
 
 assigned_device->bases[PCI_ROM_SLOT].e_physbase =
 pci_dev->rom_base_addr;
-- 
1.5.6.4
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