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Re: [Qemu-devel] [v2][PATCH 4/8] xen, gfx passthrough: reserve 00:02.0 f
From: |
Chen, Tiejun |
Subject: |
Re: [Qemu-devel] [v2][PATCH 4/8] xen, gfx passthrough: reserve 00:02.0 for INTEL IGD |
Date: |
Mon, 19 May 2014 09:25:19 +0000 |
> -----Original Message-----
> From: Gerd Hoffmann [mailto:address@hidden
> Sent: Monday, May 19, 2014 2:45 PM
> To: Chen, Tiejun
> Cc: address@hidden; address@hidden;
> address@hidden; address@hidden; address@hidden;
> address@hidden; address@hidden; Kay, Allen M;
> address@hidden; address@hidden;
> address@hidden; Zhang, Yang Z
> Subject: Re: [Qemu-devel] [v2][PATCH 4/8] xen, gfx passthrough: reserve
> 00:02.0 for INTEL IGD
>
> Hi,
>
> > + /*
> > + * Some video bioses and gfx drivers will assume the bdf of IGD is
> 00:02.0.
> > + * So user need to set it to 00:02.0 in Xen configure file explicitly,
> > + * otherwise IGD will fail to work.
> > + */
> > + pci_reserve_pci_devfn(b, PCI_DEVFN(2, 0));
>
> That is asking for trouble. Slot 2 is used by the qemu vga cards by default,
> and
> for quite a while (before memory api was merged) it even was impossible to
> change it. libvirt still places the vga card at slot
> 2 for that reason -> boom. I wouldn't be surprised if you find that
> assumption
> in other management libs / apps too.
>
> Why do you need that patch in the first place? It should be possible to
> configure qemu to not occupy slot 2 if you need it that way. Just pass '-vga
> none' to qemu. Which you probably want anyway if you pass-through a vga to
> the guest. And explicitly configure a slot (via addr=
I think '-vga none' just guarantees the qemu vga cards doesn't occupy 00:02.0,
but this doesn't mean others use this specific slot since in qemu internal, we
always pass -1 to assign a slot automatically to register a PCI device. So in
some cases, we can't get this slot as we expect since that is already assigned
previously before we need this.
> property) for all your pci devices. Doing it only for the IGD works too if
> you list
> the device before any other pci device on the qemu command line.
So in my test scenario, we can see this information:
PCI: slot 2 function 0 not available for xen-pci-passthrough, in use by
xen-platform
Thanks
Tiejun
- Re: [Qemu-devel] [Xen-devel] [v2][PATCH 3/8] xen, gfx passthrough: basic graphics passthrough support, (continued)
- Re: [Qemu-devel] [Xen-devel] [v2][PATCH 3/8] xen, gfx passthrough: basic graphics passthrough support, Chen, Tiejun, 2014/05/20
- Re: [Qemu-devel] [Xen-devel] [v2][PATCH 3/8] xen, gfx passthrough: basic graphics passthrough support, Stefano Stabellini, 2014/05/19
- Re: [Qemu-devel] [Xen-devel] [v2][PATCH 3/8] xen, gfx passthrough: basic graphics passthrough support, Chen, Tiejun, 2014/05/20
[Qemu-devel] [v2][PATCH 4/8] xen, gfx passthrough: reserve 00:02.0 for INTEL IGD, Tiejun Chen, 2014/05/16
- Re: [Qemu-devel] [Xen-devel] [v2][PATCH 4/8] xen, gfx passthrough: reserve 00:02.0 for INTEL IGD, Konrad Rzeszutek Wilk, 2014/05/16
- Re: [Qemu-devel] [v2][PATCH 4/8] xen, gfx passthrough: reserve 00:02.0 for INTEL IGD, Gerd Hoffmann, 2014/05/19
- Re: [Qemu-devel] [Xen-devel] [v2][PATCH 4/8] xen, gfx passthrough: reserve 00:02.0 for INTEL IGD, Fabio Fantoni, 2014/05/19
- Re: [Qemu-devel] [Xen-devel] [v2][PATCH 4/8] xen, gfx passthrough: reserve 00:02.0 for INTEL IGD, Zhang, Yang Z, 2014/05/19
- Re: [Qemu-devel] [Xen-devel] [v2][PATCH 4/8] xen, gfx passthrough: reserve 00:02.0 for INTEL IGD, Chen, Tiejun, 2014/05/19
- Re: [Qemu-devel] [v2][PATCH 4/8] xen, gfx passthrough: reserve 00:02.0 for INTEL IGD,
Chen, Tiejun <=
- Re: [Qemu-devel] [v2][PATCH 4/8] xen, gfx passthrough: reserve 00:02.0 for INTEL IGD, Michael S. Tsirkin, 2014/05/19
- Re: [Qemu-devel] [v2][PATCH 4/8] xen, gfx passthrough: reserve 00:02.0 for INTEL IGD, Chen, Tiejun, 2014/05/20
- Re: [Qemu-devel] [v2][PATCH 4/8] xen, gfx passthrough: reserve 00:02.0 for INTEL IGD, Michael S. Tsirkin, 2014/05/20
Re: [Qemu-devel] [v2][PATCH 4/8] xen, gfx passthrough: reserve 00:02.0 for INTEL IGD, Gerd Hoffmann, 2014/05/19
Re: [Qemu-devel] [v2][PATCH 4/8] xen, gfx passthrough: reserve 00:02.0 for INTEL IGD, Chen, Tiejun, 2014/05/19
Re: [Qemu-devel] [v2][PATCH 4/8] xen, gfx passthrough: reserve 00:02.0 for INTEL IGD, Gerd Hoffmann, 2014/05/19
Re: [Qemu-devel] [v2][PATCH 4/8] xen, gfx passthrough: reserve 00:02.0 for INTEL IGD, Daniel P. Berrange, 2014/05/19
Re: [Qemu-devel] [v2][PATCH 4/8] xen, gfx passthrough: reserve 00:02.0 for INTEL IGD, Chen, Tiejun, 2014/05/21
Re: [Qemu-devel] [v2][PATCH 4/8] xen, gfx passthrough: reserve 00:02.0 for INTEL IGD, Chen, Tiejun, 2014/05/21
Re: [Qemu-devel] [v2][PATCH 4/8] xen, gfx passthrough: reserve 00:02.0 for INTEL IGD, Gerd Hoffmann, 2014/05/22