Re: [Qemu-devel] [Xen-devel] RESEND [Xen-unstable][Qemu-xen] HVM Guest reading of Expansion ROM from passthroughed PCI device returns data from emulated VGA rom

[Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>]

On Tue, Sep 17, 2013 at 04:33:39PM +0200, Sander Eikelenboom wrote:
> *RESEND* due to exceeding the mailinglists limit for attachment size.
> 
> Hi,
> 
> I'm trying to get secondary vga-passthrough on a HVM guest to work with a AMD HD6570 and the native kernel radeon driver and kernel modesetting.
> So the guest still gets the emulated stdvga or cirrus device(used in my case here) as primary/boot vga adapter.
> 
> - When i don't passthrough the radeon card, the linux native radeon driver loads fine.
> - When i do passtrough the device to a HVM with the same kernel:
>   The driver in the guest tries to read the pci expansion rom from the passthroughed device to get the vbios.
>   The driver reports a successful read, but fails because it can't find the right string at the right offset.
> 
> So I inspected the rom by using sysfs with:
> echo 1 > /sys/bus/pci/devices/<BDF>/rom
> cat /sys/bus/pci/devices/<BDF>/rom
> 
> - When i use this in dom0 (so without passthrough) i the contents of the ROM are valid (as expected since the driver loads fine)
> - When i use this in the Guest (passthrouhed), the contents of the ROM i get are not from the passedthrough adapter, but from the emulated cirrus card.
>   (it's the same as the "tools/firmware/vgabios/VGABIOS-lgpl-latest.cirrus.bin")

I hadn't tried that, but I do get the same error:

[    4.143445] [drm] radeon defaulting to kernel modesetting.
[    4.143452] [drm] radeon kernel modesetting enabled.
[    4.143525] checking generic (f0000000 160000) vs hw (110000000 10000000)
[    4.143976] xen: --> pirq=24 -> irq=40 (gsi=40)
[    4.147760] [drm] initializing kernel modesetting (RV770 0x1002:0x9440 0x174B:0xE850).
[    4.148204] [drm] register mmio base: 0xF3040000
[    4.148209] [drm] register mmio size: 65536
[    4.152035] radeon 0000:00:06.0: >Expecting atombios for R600 GPU
[    4.152040] radeon 0000:00:06.0: >Fatal error during GPU init 
[    4.152044] [drm] radeon: finishing device.
[    4.152047] [TTM] Memory type 2 has not been initialized
[    4.168163] radeon 0000:00:06.0: >no bo for sa manager
[    4.174380] radeon: probe of 0000:00:06.0 failed with error -22

This is with the latest Xen version. No idea yet what is broken.