[Xen-devel] [PATCH] xen_pt: Fix passthrough of device with ROM.

[Anthony PERARD <anthony.perard@xxxxxxxxxx>]

QEMU does not need and should not allocate memory for the ROM of a
passthrough PCI device. So this patch initialize the particular region
like any other PCI BAR of a passthrough device.

When a guest will access the ROM, Xen will take care of the IO, QEMU
will not be involved in it.

Xen set a limit of memory available for each guest, allocating memory
for a ROM can hit this limit.

Signed-off-by: Anthony PERARD <anthony.perard@xxxxxxxxxx>
Reported-and-Tested-by: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
---
 hw/xen/xen_pt.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/hw/xen/xen_pt.c b/hw/xen/xen_pt.c
index eee4354..be4220b 100644
--- a/hw/xen/xen_pt.c
+++ b/hw/xen/xen_pt.c
@@ -440,8 +440,8 @@ static int xen_pt_register_regions(XenPCIPassthroughState 
*s)
 
         s->bases[PCI_ROM_SLOT].access.maddr = d->rom.base_addr;
 
-        memory_region_init_rom_device(&s->rom, OBJECT(s), NULL, NULL,
-                                      "xen-pci-pt-rom", d->rom.size);
+        memory_region_init_io(&s->rom, OBJECT(s), &ops, &s->dev,
+                              "xen-pci-pt-rom", d->rom.size);
         pci_register_bar(&s->dev, PCI_ROM_SLOT, PCI_BASE_ADDRESS_MEM_PREFETCH,
                          &s->rom);
 
-- 
Anthony PERARD


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