Re: iommu hardware and vga pass through with nbsd 6 dom0

[Marcus Osdoba <marcus.osdoba%googlemail.com@localhost>]

Am 15.01.2013 13:20, schrieb Manuel Bouyer:
> > Putting the primary vga adapter on the pci.hide list during boot of
> > nbsd dom0 didn't seem logical to me - so I have NOT tried this.
>
> Of course you should hide the device from dom0. You can't have 2
> independant OS using the same hardware. In addition, xl can give the
> device only if it's handled by the pciback driver in dom0.
>
> Also, hiding the PCI adapter won't prevent the dom0 from using the
> legacy VGA registers, which will also be used by the HVM domU. So you should
> remove any VGA device from the dom0 kernel completely. Of course this means
> you'll have to use a serial console for dom0.
Hello Manuel,
Thanks for your response and excuse my naivity.

Before compiling a new dom0 kernel, I picked up other PCI devices (two 
USB 3 controller) and tried to pass them through. The dmesg output 
reports them in the pciback.hide messages.

But creating the domain with xl create gives:
libxl: error: libxl_pci.c:750:libxl_device_pci_reset The kernel doesn't 
support reset from sysfs for PCI device 0000:02:00.0
libxl: error: libxl_pci.c:750:libxl_device_pci_reset The kernel doesn't 
support reset from sysfs for PCI device 0000:04:00.0

The IOMMU is enabled.

Isn't it possibel to pass through USB onboard PCI devices?

Regards,
Marcus


[boot.cfg]
menu=Boot XEN dom0 (serial):load /netbsd-XEN3_DOM0.gz console=com0 
pciback.hide=(02:00.0)(04:00.0);multiboot /xen.gz dom0_mem=256M iommu=1 
console=com1 com1=115200,8n

netbsd# dmesg|grep pciback
pciback_pci_init: hide claim device 2:0:0
pciback_pci_init: hide claim device 4:0:0
pciback0 at pci2 dev 0 function 0: vendor 0x1b6f product 0x7023 (rev. 0x01)
pciback0: mem: 0xfd4f8000 - 0x00008000
pciback0: interrupting at ioapic0 pin 16, event channel 6
pciback1 at pci4 dev 0 function 0: vendor 0x1b6f product 0x7023 (rev. 0x01)
pciback1: mem: 0xfdbf8000 - 0x00008000
pciback1: interrupting at ioapic0 pin 18, event channel 7

xm dmesg:
(XEN) AMD-Vi: IOMMU 0 Enabled.
(XEN) AMD-Vi: Enabling global vector map
(XEN) I/O virtualisation enabled
(XEN)  - Dom0 mode: Relaxed

before create:
netbsd# xl pci-list-assignable-devices
0000:02:00.0
0000:04:00.0

config:
xen_platform_pci=1
[..]
pci=[ '02:00.0', '04:00.0' ]