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xen_pt: Fix passthrough of device with ROM. 

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@citrix.com>
Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Reported-and-Tested-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
This commit is contained in:
Anthony PERARD 2014-01-10 15:56:33 +00:00 committed by Stefano Stabellini
parent fc33b9004c
commit 794798e36e
1 changed files with 2 additions and 2 deletions
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4
hw/xen/xen_pt.c
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@ -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);