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Re: [Qemu-devel] [PATCH 2/5] xen, gfx passthrough: reserve 00:02.0 for I
From: |
Anthony PERARD |
Subject: |
Re: [Qemu-devel] [PATCH 2/5] xen, gfx passthrough: reserve 00:02.0 for INTEL IGD |
Date: |
Fri, 21 Mar 2014 17:26:54 +0000 |
User-agent: |
Mutt/1.5.22 (2013-10-16) |
On Fri, Feb 21, 2014 at 02:44:10PM +0800, Yang Zhang wrote:
> From: Yang Zhang <address@hidden>
>
> Some VBIOSs and drivers assume the IGD BDF (bus:device:function) is
> always 00:02.0, so this patch reserves 00:02.0 for assigned IGD in
> guest.
>
> The original patch is from Weidong Han <address@hidden>
>
> Signed-off-by: Yang Zhang <address@hidden>
> Cc: Weidong Han <address@hidden>
> ---
> hw/pci/pci.c | 6 ++++++
> 1 files changed, 6 insertions(+), 0 deletions(-)
>
> diff --git a/hw/pci/pci.c b/hw/pci/pci.c
> index 4e0701d..e81816e 100644
> --- a/hw/pci/pci.c
> +++ b/hw/pci/pci.c
> @@ -808,6 +808,12 @@ static PCIDevice *do_pci_register_device(PCIDevice
> *pci_dev, PCIBus *bus,
> if (devfn < 0) {
> for(devfn = bus->devfn_min ; devfn < ARRAY_SIZE(bus->devices);
> devfn += PCI_FUNC_MAX) {
> +#if defined(CONFIG_XEN_PCI_PASSTHROUGH)
> + /* If gfx_passthru is in use, reserve 00:02.* for the IGD */
> + if (gfx_passthru && devfn == 0x10) {
> + continue;
> + }
> +#endif
> if (!bus->devices[devfn])
> goto found;
> }
This does not look quite right, there is maybe another way to reserve a
devfn.
--
Anthony PERARD
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